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183 Sentences With "tidal flow"

How to use tidal flow in a sentence? Find typical usage patterns (collocations)/phrases/context for "tidal flow" and check conjugation/comparative form for "tidal flow". Mastering all the usages of "tidal flow" from sentence examples published by news publications.

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Love is not just lust, madness, or a great tidal flow of dopamine, he is quick to tell us.
"Scientists discovered that because it's colder in the deepest part and because of the tidal flow, water is flowing in that river," Ms. Lin said.
It sits on 10-foot-high reinforced concrete walls to accommodate the ever increasing tidal flow and to prepare for flooding in case of storms or hurricanes.
Isolating the sea would stop the tidal flow, eventually turning it into a freshwater lake of sorts which would make it unlivable for species that depend on salt water.
The first leg would be downstream in fresh water that ranged from 68 to 70 degrees, but once she approached the hayfields and wind farms of Rio Vista, the river mouth would open and the tidal flow was likely to start toying with her.
Working from computer models of waves and tidal flow, the landscape design firm Scape proposed a necklace of submerged reefs and oyster beds to rim the island's Atlantic coast—partially man-made, partially natural structures that will promote sedimentation and absorb a tremendous amount of wave energy.
"The health of the Hudson River Estuary, from the Atlantic Ocean to Troy, New York, and the health and existence of its native species, depends on unrestricted tidal flow between the river and the sea," John Lipscomb, vice president of advocacy for the environmental organization Riverkeeper, said in a statement on Friday.
Tidal races and strong currents have special chart symbols. Tidal flow information may be shown on charts using tidal diamonds, indicating the speed and bearing of the tidal flow during each hour of the tidal cycle.
This constrains the expansion of the tidal flow and can have negative hydrologic consequences. The authorities of the Republic of Venice understood the importance of the valli for the hydrology of the lagoon. They forbade the construction of fixed banks because they did not want any impediments to the free expansion of the tidal flow. In 1314 they issued laws regarding the fishing valli.
From this principle he developed an analog computer to calculate tidal flow (electric analogon).Van Veen (1937) In the period 1944-1956 it had become operational. Later on this machine was updated and became the practical computer to calculate tidal flow and water levels in the Dutch Delta (to predict the effect of closure works, the Delta Works. This analog computer now bears the name Deltar.
Before hay was baled and stored under cover, it was used to top the hay stacks in the fields. Many of the salt marshes in Rhode Island have been severely affected by filling, development, and road construction. These alterations restrict tidal flow, often having a severe ecological impact on the marsh. Because saltmeadow cordgrass requires a salty, wet habitat, restricted tidal flow often dries out the marsh and encourages the growth of invasive freshwater plants.
The Coronation Drive Tidal Flow System was implemented to improve traffic flow along the routinely congested road. It consists of overhead gantries displaying white arrows or red crosses to indicate which lanes can be driven in, LED signs on approach that indicate current lanes open, LED catseye markers embedded in the road that are turned on and off to move the median line and boom gates that swing into the lanes when closed to stop use of the closed lane. The Tidal Flow System was heavily criticised by the public for a number of reasons. These included the perception that the lane system was confusing and caused road accidents, especially when drivers were required to make turns on or off the tidal flow system.
The river enters the Atlantic Ocean by passing under NH 1A, using a new, large culvert installed by the New Hampshire Coastal Program in an effort to improve tidal flow into the salt marsh.
Types of natural phenomena include: Weather, fog, thunder, tornadoes; biological processes, decomposition, germination; physical processes, wave propagation, erosion; tidal flow, moonbow, blood moon and natural disasters such as electromagnetic pulses, volcanic eruptions and earthquakes.
The lagoon is drained of water by tidal flow via a narrow channel of in depth and which passes through the west branch in order to reach the east branch. The tidal flow is reported as being as high as . The west branch has an average water depth of presumably at low water while the eastern branch has several deeper areas - the majority of its north side ranges in depth from and its south side has a number of deeper areas in the range of .
The bridge is only one lane wide with access controlled by a tidal flow system controlled by signals at either end of the bridge. A separate footbridge is attached to the northern side of the structure.
Nusa Penida covers a wide area of diving locations, including Penida Bay, Batu Lumbung (Manta Point), Batu Meling, Batu Abah, Toya Pakeh and Malibu Point. The flow through the Lombok Strait is, overall, south-tending, although the strength and direction of the tidal streams are influenced by the monsoon seasons. During the southeast monsoons, the tidal flow tends south; during the northeast monsoons, the tidal flow tends north. In the area of the strait north of Nusa Penida, the pattern is relatively simple, with a flow, at peaktide, of about three-and-one-half knots.
The tidal effects observed along the banks of the strait can also be confusing. A rising tide approaches from the south-west, causing the water in the strait to flow north-eastwards as the level rises. The tide also flows around Anglesey until, after a few hours, it starts to flow into the strait in a south-westerly direction from Beaumaris. By the time this happens the tidal flow from the Caernarfon end is weakening and the tide continues to rise in height but the direction of tidal flow is reversed.
This is not simple, uniform tidal flow in and out of the bay because its amplitude does not follow a spring-neap cycle and there is a phase difference of several hours between the surface and the bottom.
During the 1950s, tide gates were installed on the creek that largely cut off the tidal flow into the surrounding wetlands. The restoration of the surrounding wetlands has been an ongoing project of several state and private agencies.
These discharge amounts can be estimated using tidal statistics. Some challenges to estimating discharge amounts include reversing tidal flow, compensation flow for Stokes drift, spring-neap water storage effects, lateral circulation, and multiple distributaries or ebb and flood channels.
Friend, West Wind, Flood Tide, p. 51. Kinney, Battles and Leaders, v. 4, p. 385. Grant's Pass was also obstructed by a set of piles and other impediments, which had the effect of diverting the tidal flow to Heron Pass.
This decision was influenced by the construction of the Hale Street Bridge and also the maintenance cost of the system, amounting to $600,000 each year, with a further $7 million in repairs.(1 September 2008). Coronation Drive's tidal flow system scrapped . ABC News.
It has two lanes in each direction, and runs at an angle of approximately thirty degrees (North to South) to the Sydney Harbour Bridge, which has eight lanes, with a tidal flow operation. In 2008, the tunnel was carrying around 90,000 vehicles per day.
Critics claim that the tidal flow system has not been effective in improving traffic flow. The primary reason given is due to traffic in both directions being high at peak hour due to the University of Queensland bound traffic balancing the city bound traffic. The tidal flow system did not close lanes due to traffic accidents or roadworks, instead, traditional vehicles and signage were used, leaving a much touted feature of the system unutilised. Out of state or overseas drivers tended to not understand the system and its dynamic lanes, thus were likely to end up driving in T3/Bus lanes or not merging when they should.
North Road (Cardiff) tidal flow system, a 3-lane single carriageway The southernmost point of the route is in Cardiff Bay, outside the Wales Millennium Centre. It runs up Lloyd George Avenue (this was previously Collingdon Road, and the A470 previously ran along the parallel Bute Street), and continues along St. Mary Street in central Cardiff. The road then becomes North Road, and after a tidal flow system running to Maindy and then goes over the flyover at the Gabalfa interchange of the A48 and the A469. It becomes an urban dual-carriageway along Manor Way, with a speed limit and with many traffic-signalled crossings.
The Tidal Flow System was dismantled and removed at the end of 2008 after a decision by the Brisbane City Council. A similar system is operated on the Houghton Highway across Bramble Bay at Redcliffe until the opening of the Ted Smout Memorial Bridge in 2011.
Tidal flow occurs as far north as Troy, over 150 miles away. The salt front (dilute salt water) can reach Poughkeepsie in drought conditions and is present in the lower reaches of the Raritan River for most of the year.Hudson Estuary Basics Dept. of Environmental Conservation, NY State.
"Archaeologists tents" were then set up on the lawn outside Tate Britain, where each item was meticulously cleaned and identified by professionals including Museum of London staff, Thames River Police and ecologists. Once collected and processed Mark Dion created an artwork from the objects and artefacts. The finds are presented as an installation, arranged in a mahogany cabinet alongside photographs of the beachcombers and tidal flow charts. First shown at the Tate Gallery as an Art Now installation between October 1999 and January 2000, the finds for Tate Thames Dig are presented according to location in a double-sided old-fashioned mahogany cabinet, alongside photographs of the beachcombers and tidal flow charts.
Corruption by Design: Building Clean Government in Mainland China and Hong Kong. Harvard University press. From 1998, one year after the transfer of sovereignty, some Hong Kong-born emigrants returned to Hong Kong with foreign citizenship. The phenomenon is called "香港回流潮" (Hong-Kong returning tidal flow).
Much of the land was acquired from Hartz Mountain. The 209-acre Mill Creek Marsh was acquired for preservation by the New Jersey Meadowlands Commission in 1996. Two years later, the Commission began to remediate the site, including re-establishing the tidal flow, constructing trails and planting native vegetation.Peterson, Iver.
The Mayur River is located in Bangladesh. It is a former distributary of the Ganges close to the northwestern boundary of the metropolitan area of Khulna, and receives most of the drainage from the city. The river is obstructed by sediment buildup, and its natural tidal flow is prevented by gates.
The location was selected because it was just above the upstream tidal flow of seawater at Colleges Crossing. The concrete structure was completed in April 1892. The dam wall rises and is in length. The weir has a capacity of , making it one of the largest weirs in the region.
This is a cosmopolitan species. They can be found anywhere where there is moist and decaying wood, such as wharf timbers that are regularly submerged by a tidal flow river, for example near the River Thames. A survey by Pitman et al. (2003) revealed the wharf borer to be widespread in temperate countries.
Plum Island Beach is a gently sloping shelf extending some distance out to sea. As a result of the slope, tidal flow does not reach very far horizontally, while breakers are small and close to shore. Boats can easily be launched from or landed on the beach. The shelf causes strong undertow currents.
There is often congestion with tailbacks at the weekends, especially on Sunday evenings. Due to its sharp turns with restricted headroom, high-sided vehicles can only use the left-hand lane of the western tunnel, so it was not possible to reverse the tidal flow in the evening. In April 2007, the morning tidal flow was discontinued, after reports by TfL and the Metropolitan Police (MPS) of an increase in dangerous motoring behaviour; these blamed poor driving, such as overtaking, for the decrease in safety during counterflow operations. The decision to end the counterflow was controversial, particularly as TfL and the MPS had been considering it since 2005, without properly informing affected borough councils, and an independent committee was set up to evaluate the decision.
Each chart covers a single hour between one high water and another (they ignore the leftover 24 minutes) and show the average tidal flow for that hour. An arrow on the tidal chart indicates the direction and the average flow speed (usually in knots) for spring and neap tides. If a tide chart is not available, most nautical charts have "tidal diamonds" which relate specific points on the chart to a table giving tidal flow direction and speed. The standard procedure to counteract tidal effects on navigation is to (1) calculate a "dead reckoning" position (or DR) from travel distance and direction, (2) mark the chart (with a vertical cross like a plus sign) and (3) draw a line from the DR in the tide's direction.
A remarkable feature of the region is the large internal tides that occur. These are a form of internal wave driven by the local tidal flow forcing the stratification against sloping areas of the shelf face. The surface manifestation of these waves can be seen from space. These waves generate brief highly localised accelerations.
It enters a cutting before reaching the second junction, where the tidal flow ends as does the motorway. The motorway is curved in Aston to avoid an Ansells brewery. The motorway was also crossed by a vinegar pipeline, carrying the condiment from one part of the since-demolished HP Sauce factory to the other.
A high spring tide around Ynys Gored Goch, 30 March 2006. The strong tidal flow in the Menai Strait creates small whirlpools, hence the name the "Swellies". In olden times, access by rowing boat was restricted by the tides but nowadays modern boats can access anytime. Mains water and electricity were installed in 1997.
Chaos and Desire () is a Canadian drama film, released in 2002. Written and directed by Manon Briand, the film stars Pascale Bussières as Alice Bradley, a seismologist returning to her hometown of Baie-Comeau, Quebec to investigate a mysterious interruption in the tidal flow on the St. Lawrence River."Review: ‘Chaos and Desire’". Variety, August 23, 2002.
Leopard coral groupers generally form into a dense aggregation to spawn. These aggregations are formed around reef slopes around deep and peak at the new moon. Spawning occurs when the tidal flow is strong, particularly during ebb tides. This is thought to allow the newly released eggs to be transported well away from the reef and its associated predators.
This include the ecosystem in this area, encompassing living plants and neighboring species. The State Water Project's Suisun Marsh Salinity Control Gates manages tidal flows to limit saltwater intrusion from salty tidal flows. The California's Department of Water Resources built this tidal-flow control gate to limit high saline first introduced from Grizzly Bay and through the Montezuma Slough.
Until the advent of automated navigation, competence in calculating tidal effects was important to naval officers. The certificate of examination for lieutenants in the Royal Navy once declared that the prospective officer was able to "shift his tides". Tidal flow timings and velocities appear in tide charts or a tidal stream atlas. Tide charts come in sets.
An Atlantic coastal salt marsh in Connecticut. Coastal salt marshes can be distinguished from terrestrial habitats by the daily tidal flow that occurs and continuously floods the area. It is an important process in delivering sediments, nutrients and plant water supply to the marsh. At higher elevations in the upper marsh zone, there is much less tidal inflow, resulting in lower salinity levels.
The tunnels channel tidal water in and out of the lake. Tide levels in the lake are damped to about a third of the lagoon tidal levels. The tidal peaks are delayed from the lagoon tidal peaks by about 1 hour and forty minutes. Biologist William Hamner estimated that about 2.5% of the lake's volume is exchanged during a tidal flow.
Divett, 2012, Tidal Stream Energy Extraction in a Large Deep Strait: the Karori Rip, Cook Strait, Continental Shelf Research, 33: 100–109. , DOI: 10.1016/j.csr.2011.11.012. There are numerous computer models of the tidal flow through Cook Strait. While the tidal components are readily realizable,Lunar tides in Cook Strait, New Zealand the residual flow is more difficult to model.
This tidal flow can generate currents of up to 7 knots within the entrance channels. The Port of Tauranga is located in the harbour and container ships and cruise ships use the harbour's waters. The Tauranga harbour entrance is the shipping channel to the Port of Tauranga, New Zealand’s largest export port. Shipping movements can take place at any time, day or night, through the main channels.
Soil salinity in the lower marsh zone is fairly constant due to everyday annual tidal flow. However, in the upper marsh, variability in salinity is shown as a result of less frequent flooding and climate variations. Rainfall can reduce salinity and evapotranspiration can increase levels during dry periods. As a result, there are microhabitats populated by different species of flora and fauna dependent on their physiological abilities.
The project primarily involved leveling the ash mounds, with the leftover material used to fill other areas of the meadow. Two sites were excavated to create Meadow and Willow Lake, while much of the Flushing River was diverted into underground culverts. A floodgate was built to prevent tidal flow from flooding the lakes.; ; ; In addition to recreation, the lakes would serve as repositories for excess storm runoff.
Palsey developed a new form of pontoon bridge which was adopted in 1817 by the British Army. Each pontoon was split into two-halves and you could connect two pointed ends together in cases where you had tidal flow. Each half was enclosed, so reducing the risk of swamping and there were multiple lashing points. The "Pasley Pontoon" lasted until it was replaced in 1836.
The causeway linking Cayo Coco to the mainland is long and runs across Bahia de Perros (Bay of Dogs). It took 16 months to build and required of stone. The causeway caused concern among environmentalists because it disturbed the tidal flow, thus changing the salinity and temperature of the water. A number of gaps were created in the causeway to restore some water flow.
High energy and high flow environments can affect the long-term stability of the cap and cause plausible erosion over time. Currents are also important. Currents vary along a water column and placement of the ISC can be negatively affected by changing currents. It is important to take into consideration the long-term impacts of episodic events such as tidal flow on bottom current velocities.
Construction was completed in 2006 and by 2011 the land had evolved into wetland, mudflats, saline lagoons and seven artificial islands, allowing the wildlife to reside on these areas. An extension to the scheme, using 2,400 shiploads of spoil excavated from London's Crossrail tunnels, was completed in July 2015, when an additional area of land was opened to tidal flow. The whole project is expected to be completed by 2025.
The Aston Expressway approaching Birmingham City Centre A38(M) runs from the A5127 through Gravelly Hill Interchange where the A38 joins and then shortly after traffic from the M6 motorway also joins. It then enters a tidal flow section. The road is on a viaduct as it passes through Aston; this section cuts through the grounds of Aston Hall.The Motorway Archive – A38(M) The road passes through its first junction after .
The Pokemouche River passes through the village in an “S” shape, flowing in from the west and out into the north-east. The banks of the river are steep in Upper Pokemouche while the rest of the territory is rather flat. The river measures between 200 and 1000 meters wide at the level of the village. The tidal flow is perceptible up as far as Maltempeque, to the west.
The Gallox Bridge in Dunster, Somerset, England dates from the 15th century. It has been designated as a Grade I listed building and scheduled monument. The bridge is in the guardianship of English Heritage. The stone packhorse bridge crosses the River Avill at the southern end of the village, below Dunster Castle at a point which may have been the limit of tidal flow during the medieval period.
The pond is the center of the Wreck Pond Watershed, which covers about in eastern Monmouth County. Its primary feeder streams are Wreck Pond Brook, Hurleys Pond Brook and Hannabrand Brook. Other bodies of water in the watershed include: Hurleys Pond, Osbornes Pond, Albert Pond and Old Mill Pond. It emptied into the Atlantic Ocean through an outfall pipe which regulates the tidal flow in and out of the pond.
Sechelt Inlet, with Skookumchuck Narrows highlighted and Sechelt Rapids circled. Skookumchuck Narrows is a strait forming the entrance of Sechelt Inlet on British Columbia's Sunshine Coast in Canada. Before broadening into Sechelt Inlet, all of its tidal flow together with that of Salmon Inlet and Narrows Inlet must pass through Sechelt Rapids. At peak flows, standing waves, whitecaps, and whirlpools form at the rapids even in calm weather.
Upstream from this, a viaduct was needed to span the River Trym and the remains of a Roman harbour. It was composed of six 42-foot, 6-inch (12.95 m) arches, with abutments embedded in the rock below. It was supported by three piers at , and below road level. Construction of the viaduct was delayed owing to the tidal flow of the River Avon and the irregularity of the rock.
A mirror of the Eights Head of the River for male crews, it is held a fortnight earlier when the tides are similar. It is raced on the outgoing tide and starting around one hour after high tide in order to maximise advantage from the tidal flow. Around 300 crews of women (with the occasional male coxswain) compete for over a dozen trophies and pennants. There are categories for beginners, elite and veteran rowers.
Once the strength of the tidal flow was thus broken, more traditional techniques could be successfully employed. The breach of the Nolle dijk near Vlissingen was first filled on 3 September 1945, but the dike broke again three weeks later. This breach was finally closed on 2 October 1945, almost exactly a year after it was formed. The breach at Westkapelle was closed on 12 October, followed by the Veere breach on 23 October.
On the left is Whitaker Ponds Natural Area. Shortly thereafter, it receives Whitaker Slough on the left and crosses the Broadmoor Golf Course. Between from the mouth, it receives Buffalo Slough from the left and passes by the defunct Peninsula Drainage Canal (City Canal), which lies to the slough's right. At this point, it passes through a second gated levee that separates the middle slough from the lower slough and its tidal flow reversals.
The Charleston Slough is a rich salt marsh and littoral zone, providing feeding areas for a variety of shorebirds and other estuarine wildlife. At low tide Charleston Slough looks like a salt pond, like the Cargill salt ponds to the east of it, but it is open to tidal flow. Pumps and gates regulate the flow through the slough. Water from the slough gets pumped into Shoreline Lake, which then drains into Permanente Creek.
The northbound Blackwall Tunnel is a traffic bottleneck with tailbacks. A TfL study in 2009 revealed that the approach to the northbound tunnel took around 19 minutes in rush hour traffic, or a delay of approximately 11 minutes per kilometre. To relieve the congestion, a tidal flow system was introduced in 1978, allowing northbound traffic to use the western lane of the eastern tunnel. The congestion is not limited to weekday rush hours.
The island of Justøy lies just south of the town of Lillesand, along the Blindleia. The Kvåsefjorden lies along the southwestern border of Lillesand municipality. Navigation through the Blindleia passage requires attention to detail, but is not difficult as there are no tides, and very little current. The minimal tidal change in the skerries is due to its geographical location; the tidal flow that comes in from the Atlantic Ocean splits on the British Isles.
There is very little protection from the fierce tidal flow, so accurate timing for slack water is required. During the 19th century the island was used as a navigational aid to ships sailing into Liverpool. Any vessel that passed the island without signalling, and waiting for, a pilot was liable to incur a fine. The S.S. Liverpool, following a collision with a ship named Laplata, was shipwrecked near Middle Mouse in 1863.
Barrow Haven is a hamlet and small port in North Lincolnshire, England. It was the site of a former ferry crossing that spanned from the Humber Estuary to Hull, serving as a place for ships and boats crossing the Humber to moor away from the tidal flow. A port continues to exist nearby and the area's rail access is based at the Barrow Haven railway station, a stop on the Barton Line.
Waikiki Beach erosion in 2011 The restored Beach in June 2012 Waikiki beach has had repeated problems with erosion, leading to the construction of groins and beach replenishment projects. Imported sand came from California and from local beaches such as Pāpōhaku Beach on Moloka‘i, and a sandbar from Oʻahu's Northern side near Kahuku. Officials look for ways to sustain the existing sand by eliminating loss due to tidal flow. Erosion claims about one foot of beach per year.
Hence, many species have developed adaptations to prevent this drying out, such as the production of mucous layers and shells. Many species use shells and holdfasts to provide stability against strong wave actions. There are also a variety of other challenges such as temperature fluctuations due to tidal flow (resulting in exposure), changes in salinity and various ranges of illumination. Other threats include predation from birds and other marine organisms, as well as the effects of pollution.
The upriver limit of tidal flow is close to the village of Haverthwaite. Also at this point is to be found Low Wood Bridge which, until the coming of the railways, was the first bridging point across the river. The Leven is navigable upstream as far as Low Wood, and downstream from Windermere to Newby Bridge. Apart from Newby Bridge and Haverthwaite, the only other settlements on the Leven are the villages of Backbarrow and Greenodd.
Soon after this, a bar of shingle began to form in the sea, affecting the current and also the tidal flow of the stream. This protected the coastline and allowed salt marshes to form. Usually called the "saltgreen", "Worthing Common" or, most often, the "saltgrass", this fertile soil contained large amounts of salt—the most important preservative agent of the pre-refrigeration era. Salt and other minerals were extracted, and the land was used for farming.
Sea urchins were used to check the levels of metals in the environment. It is advantageous to use green sea urchins (Strongylocentrotus droebachiensis), because they are widely distributed, abundant in many locations, and easily accessible. By investigating the concentrations of metals in the green sea urchins, the impacts of chemicals from salmon aquaculture activity could be assessed and detected. Samples were taken at 25-metre intervals along a transect in the direction of the main tidal flow.
The cut in funding sees the design of the motorway abruptly reduce from about the Bowen Street overbridge as six lanes are curtailed to three lanes. Appraisal of expected traffic flows also indicated that the second tunnel would not be needed for many years. A reversible lane (tidal flow) system as used on the Auckland Harbour Bridge has been proposed. Investigation as part of the tunnel link project raised questions about safety of such an option, but it has not been ruled out.
Two parts of the river were excavated to create Meadow and Willow Lake, while much of the rest of the Flushing River was diverted into underground culverts. The Tidal Gate Bridge was built at the park's northern end to prevent tidal flow from flooding the lakes. In addition to recreation, the lakes would serve as repositories for excess storm runoff. By then, Horse Brook had already been covered over, while Kissena Creek was in the process of being covered over.
The River Roach is part of the River Crouch and Roach tidal river system which includes all of the creeks around Wallasea Island, Foulness Island, Potton Island, New England Island, Havengore Island and Rushley Island. The tidal flow around the creeks between those latter islands considerably affects the tides in the River Roach. Those creeks and tidal flows also enhance the River Roach's habitat and conditions for oyster cultivation and fish spawning. The River Roach is part of the Crouch Harbour.
Estimates of the maximum head difference that can be obtained from a variety of dam configurations are based on numerical and analytical models. Field information from measured water level differences across natural barriers confirms the creation of significant head. The (maximum) head difference is more than what would be expected in stationary flow situations (such as rivers). The maximum head difference reaches values up to a few m, which can be attributed to the non-permanent character of the tidal flow (acceleration).
Passageway linking the tunnels to the ticket office, looking towards the latter. Note tidal flow segregation, in operation on football match days (fans using the wider section). When it was first built, the station building was squeezed between residential properties on each side, occupying the width of just two terraced houses. Even after the surface building was rebuilt and widened in the early 1930s, with a further house being demolished, it has one of the narrowest frontages of any Underground station.
Crossing the channel by small boat is not recommended, especially during a high swell, due to the network of channels and shifting sand bars. The tidal flow is rapid with a rate of 150 cm per second during the flooding tide and slightly slower during the ebb tide of 100 cm per second. The passage has a return coefficient of 50%, meaning that half the amount of water that leaves the bay via the passage returns the same way on the flooding tide.
This last approach is often the most practiced and generally more successful than allowing the area to naturally recover on its own. The salt marshes in the state of Connecticut in the United States have long been an area lost to fill and dredging. As of 1969, the Tidal Wetland Act was introduced that ceased this practice, but despite the introduction of the act, the system was still degrading due to alterations in tidal flow. One area in Connecticut is the marshes on Barn Island.
Dunmanus Bay as seen from Three Castle Head Dunmanus Bay is a bay in County Cork, Ireland. The bay lies between Mizen Head to the south and Sheep's Head to the north with the small village of Durrus at the head of the bay. The bay is out of the main tidal flow with no significant rivers flowing into it and is little frequented by vessels. On the eastern shore of the bay are the ruins of Dunmanus Castle built by the O'Mahony clan.
There are four stages of decomposition associated with a whale fall. These stages vary in duration and overlap with one other with the size of the carcass, water depth, and other environmental variables, such as tidal flow. Large, intact whale falls appear to pass through the four decomposition stages, while the stages on smaller or partial carcasses may be truncated. Smaller cetaceans, such as porpoises and dolphins, do not undergo the same ecological succession stages due to their small size and lower lipid content.
C. cruxmelitensis is the smallest member of the stalked jellyfishes growing to a maximum of 1.2 cm in diameter and 0.8 cm in height. It characteristically appears 'stalkless', although in fact it attaches to its location via a short stalk that terminates in a broad basal disc. It appears to have the unusual capacity to hold itself very rigidly in this posture, even when subjected to agitation caused by tidal flow. Calvadosia cruxmelitensis has a translucent, maroon, broad funnel-shaped bell which is divided by hollow septa.
Upon the election of Campbell Newman, the bus lanes were changed to T3 Transit Lanes with three occupants required. In March 2007 the T3 transit lane restrictions were removed after Campbell Newman requested the change based on analysis showing that only 5% of vehicles actually use the T3 lane. The Labor opposition did not block the change.Courier Mail Article on Removing T3 lanes The Regatta Hotel In September 2008, the Council announced a decision to scrap the Tidal Flow System after conceding it as a failure.
Salinity can be as low as 1.015 (SG) due to runoff from rivers, especially during the rainy season. The mean tidal range is with a maximum range of ; tidal flow in the lagoon is weak. Rivers that drain into Chiriquí Lagoon include the Guariviara River and Cricamola River, both of which flow through the wetlands on the southeast shore of the lagoon. These are protected as part of the Ramsar site of Damani-Guariviara, which covers of land between the lagoon and the Caribbean coast.
Salvinia molesta prefers to grow in slow-moving waters such as those found in lakes, ponds, billabongs (oxbows), streams, ditches, marshes, and rivers. It prefers nutrient-rich waters such as those found in eutrophic water or those polluted by waste water. It does not usually grow in brackish or salty waters, but has been reported in streams with a tidal flow in southeast Texas. It copes well with dewatering, and while it prefers to grow in moderate temperatures, it will tolerate low or very high temperatures.
Deception Pass is a dramatic seascape where the tidal flow and whirlpools beneath the twin bridges connecting Fidalgo Island to Whidbey Island move quickly. During ebb and flood tide current speed reaches about , flowing in opposite directions between ebb and flood. This swift current can lead to standing waves, large whirlpools, and roiling eddies. This swift current phenomenon can be viewed from the twin bridges' pedestrian walkways or from the trail leading below the larger south bridge from the parking lot on the Whidbey Island side.
The former salt ponds provide habitat for several shorebird species. The number of western snowy plovers (Charadrius nivosus) nesting in the ponds in spring improved after active management began in 1995 by the Point Reyes Bird Observatory Conservation Science group. publication Number 1251 In 1999 the ponds were identified as the most critical breeding habitat in the Monterey Bay region for the plovers. In 2006 a managed tidal flow was improved, funded by Ducks Unlimited, the California Wildlife Conservation Board and the National Fish and Wildlife Foundation.
Following this, several large engines were installed under his direction by various water companies about London. Meanwhile, he carried out various additions to the reservoirs and other works of the company. Among these was to transfer the source of the company’s supply from Old Ford to Lea Bridge up river from the tidal flow. Between 1838 and 1845, he was retained as Consulting Engineer to the Grand Junction, Vauxhall, Southwark, and Kent Waterwork Companies, while still Resident Engineer to the East London Water Works.
Cromadh (now Croom) was a village in the territory of the Uí Fidgenti, and one of the seats of the O’Donovans of the Ui Fidgheinte, which flourished from the late 4th century to the mid 12th century. A hermitage, Dísert Óengusa, was founded nearby by Óengus of Tallaght around the year AD 780. The townland is located on the River Maigue, which although now having a tidal flow only to Adare, in ancient years the river had a tidal flow past Croom, making it a transit route for the Viking ships traversing inland from the Shannon during the 9th and 10th centuries. Contacts arising along the Maigue River between Danish Vikings and the Ui Donnabhains provide an insight into the alliance between the two groups in the late 10th century. John O’Donovan claimed in an appendix to the Annals of the Four Masters Appendix to the Annals of the Four Masters, edited John O’Donovan, page 2437 that Croom derived its name from Ancrom O'Donovan Crom Ua Donnabáin, who was slain in Innis Beale Antha Dos (now Broadford) in 1254, based on the similarity of Ancrom with Crom.
Their track "Tidal Flow" was included on the classic record Some Bizzare Album on Some Bizzare Records run by Stevo Pearce. The group toured with Blancmange and Pink Military. Adamson worked as personal assistant to record producer Martin Hannett from 1981 until 1983.Pelly, Jenn (2013) "Peter Hook Talks Plans for Joy Division, New Order Tapes Rescued From Trash", Pitchfork, August 28, 2013. Retrieved March 17, 2018 She was employed as a tape op and sound engineer at Yellow Two and Strawberry Studios in Stockport from 1984 to 1990.
The NJMC has acquired more than of the remaining wetlands in the Meadowlands District for preservation and enhancement. The Skeetkill Creek Marsh in Ridgefield, Harrier Meadow in North Arlington, and Mill Creek Marsh in Secaucus have been restored or enhanced through the agency’s efforts. Goals of restorations include increased tidal flow, the reduction of phragmites, and greater use of the site by estuarine species of fish, waterfowl, and shorebirds. According to a report by the New Jersey Audubon Society, the Meadowlands is a major part of the Atlantic Flyway migration route.
These marshes were diked then impounded with salt and brackish marsh during 1946–1966. As a result, the marsh shifted to a freshwater state and became dominated by the invasive species P. australis, Typha angustifolia and T. latifolia that have little ecological connection to the area. By 1980, a restoration programme was put in place that has now been running for over 20 years. This programme has aimed to reconnect the marshes by returning tidal flow along with the ecological functions and characteristics of the marshes back to their original state.
In these estuaries, tidal flow is greater relative to river discharge, resulting in a well mixed water column and the disappearance of the vertical salinity gradient. The freshwater-seawater boundary is eliminated due to the intense turbulent mixing and eddy effects. The width to depth ratio of vertically homogeneous estuaries is large, with the limited depth creating enough vertical shearing on the seafloor to mix the water column completely. If tidal currents at the mouth of an estuary are strong enough to create turbulent mixing, vertically homogeneous conditions often develop.
The problem of siltation had preoccupied the merchants of the town for hundreds of years and occupied the attentions of various engineers, leading eventually to disputes which came to court in the eighteenth century. Sir John Coode, who had been knighted for his work on the completion of Portland harbour was recruited to solve its siltation problems in the 1880s. No attempted solution proved permanent. The growth of faster marine traffic whose wake washes at the banks of the marshes has widened the channel and reduced tidal flow further.
The scale of Living Machine systems ranges from the individual building to community-scale public works. Some of the earliest Living Machines were used to treat domestic wastewater in small, ecologically-conscious villages, such as Findhorn Community in Scotland,.Ecovillage Findhorn: Biological Waste Water Treatment Some treated the mixed municipal wastewater for semi-urban areas, such as South Burlington, Vermont (this plant is closed). The latest-generation Tidal Flow Wetland Living Machines are being used in major urban office buildings, military bases, housing developments, resorts and institutional campuses.
If generated by flow over topography, they are called Lee waves or mountain waves. If the mountain waves break aloft, they can result in strong warm winds at the ground known as Chinook winds (in North America) or Foehn winds (in Europe). If generated in the ocean by tidal flow over submarine ridges or the continental shelf, they are called internal tides. If they evolve slowly compared to the Earth's rotational frequency so that their dynamics are influenced by the Coriolis effect, they are called inertia gravity waves or, simply, inertial waves.
At large scales, internal waves are influenced both by the rotation of the Earth as well as by the stratification of the medium. The frequencies of these geophysical wave motions vary from a lower limit of the Coriolis frequency (inertial motions) up to the Brunt–Väisälä frequency, or buoyancy frequency (buoyancy oscillations). Above the Brunt–Väisälä frequency, there may be evanescent internal wave motions, for example those resulting from partial reflection. Internal waves at tidal frequencies are produced by tidal flow over topography/bathymetry, and are known as internal tides.
In addition to draining upland fresh water (in many instances) tidal creeks form by headwater retreat and downward incision of the water as it flows from inland to the shore. Tidal creeks deposit sediment in a process called accretion, which can maintain a flat plain by counteracting sea level rise or land subsidence. High tidal flow will maintain channels, while slower flow velocity can lead to closure of tidal creeks as they become clogged with sediment. Well-developed wetlands have sharp-banked tidal creeks, with vegetation stabilizing the sides of the creeks.
In August 2013, a long period of hot dry weather followed by heavy rain washed polluted road run-off water into the Lower Lea, causing deoxygenation of the water. The role of the canalisation of the Bow Back Rivers in and around the Olympic Park, with its consequences for tidal flow have been implicated in the considerable levels of fish kill which resulted from the incident."Fish killed in the River Lea. Pushed to their limits by environmental mismanagement" (Martin Slavin, Gamesmonitor, July 2013) accessed 11 August 2013.
When the bridge was opened it was the longest bridge in Australia. The toll was collected on the Sylvania side of the bridge by toll collectors who stood on the road. On 31 May 1952 the tolls were removed when the Council had repaid the loan to the NSW Government. In the late 1940s the lanes on the bridge were reconfigured to provide a third lane, and this allow the introduction of a tidal flow system (northbound in the morning and southbound in the evening), which continued until the second bridge was opened.
The flood caused the redirection of Coronation Drive so that traffic inbound to Brisbane City turned left at the Sylvan Road intersection, and then right down Land Street. Heritage listed terraced house on Coronation Drive at Milton. In 2004 Coronation Drive was completely redeveloped into its current day form, with the redirection removed and widening to allow 6 lanes of traffic. Former Lord Mayor Jim Soorley inaugurated a series of "tidal flow" traffic lights in both directions, as well as a dedicated bus lane, in order to ease congestion along the road.
Lights in the road meant to guide drivers were often broken and during daylight hours were hard to discern. In particular, the right hand turn from Coronation Drive onto Lang Street (outbound) has two lanes and drivers were routinely confused as to which lane on Lang street they should turn into. The Tidal Flow System was well over budget, with the cost of the system far higher than originally planned. The system was prone to vandalism, in particular the boom gates used to block off lanes were routinely hit by vehicles.
Oxyurichthys microlepis, the maned goby, is a species of goby native to tropical marine and brackish waters along the coasts of the Indian Ocean from Africa to the western Pacific Ocean where it occurs in estuaries and inshore waters to depths of about . It occurs in the Mekong Delta and is suspected to use the tidal flow up the river to reach as far inland as Cambodia. This species can reach a length of TL. It is of minor importance to local commercial fisheries and can also be found in the aquarium trade.
Mass stranding of dolphins, Nova Scotia (1918) Some strandings may be caused by larger cetaceans following dolphins and porpoises into shallow coastal waters. The larger animals may habituate to following faster-moving dolphins. If they encounter an adverse combination of tidal flow and seabed topography, the larger species may become trapped. Sometimes following a dolphin can help lead a whale out of danger: In 2008, a local dolphin was followed out to open water by two pygmy sperm whales that had become lost behind a sandbar at Mahia Beach, New Zealand.
Every day, more than 100 trains pass over the causeway, 50 of those ferrying cars (there is no road link to Sylt). Each year, the railway ferries more than 450,000 vehicles over the causeway. The causeway, which bears the Weimar Republic Reichspräsident Paul von Hindenburg's name, has interrupted the tidal flow, which until the causeway's appearance had flowed freely between Sylt and the mainland. This change in tides, it is believed, is part of what has led to the loss of a certain amount of land at Sylt's southern end.
Once deployed, it was normally impossible to recover a drogue unless the aircraft was stationary relative to the local tidal flow. Portable beaching gear could be attached by ground crew so that the aircraft could be pulled up on land. The gear consisted of a pair of two-wheeled struts that could be attached to either side of the fuselage, below the wing, with a two- or four- wheel trolley and towbar attached under the rear of the hull. A standard stocked anchor was stowed in the forward compartment alongside the anchor winch.
The only access to Bun Sruth is on foot or by boat. From the sea the narrow tidal gorge is difficult to find, and difficulties in negotiating the channel can arise from the fast tidal flow and from seaweed which prevents the use of a propeller. At low tide the water level in the loch is higher than sea level, and drains over a rock shelf in the entrance, making entrance by boat impossible until the tide has risen at least seven feet. Exit by boat is thus best undertaken just after high tide.
Cleanliness continued to be a problem because of incomplete sewage projects and the lake kept silting up since the natural tidal flow had been interrupted by Merritt's dam. Dredging of the lake began in 1891, with the removed silt being piled along the eastern shore to make a foundation for a road which became Lakeshore Avenue. From 1893 to 1915, Lake Merritt saw major changes. Inspired by the new City Beautiful movement which got its start at the World's Columbian Exposition (Chicago World's Fair), the lake became a city-owned park.
Many marine organisms use olfaction (chemical cues in the form of scent) to locate a safe area to metamorphose at the end of their larval stage. This has been shown in both vertebrates and invertebrates. Research has shown that larvae are able to distinguish between water from the open ocean and water from more suitable nursery habitats such as lagoons and seagrass beds. Chemical cues can be extremely useful for larvae, but may not have a constant presence, as water input can depend on currents and tidal flow.
Yarm is a small town in the borough of Stockton-on-Tees, North Yorkshire, England. The town is on the south bank of the River Tees and is historically part of the North Riding of Yorkshire. The bridge at Yarm marked the furthest reach of tidal flow up the River Tees until the opening, in 1995, of the Tees Barrage, which now regulates river flow above Stockton. As the last bridge on the river before the sea, it was superseded by a new toll bridge opened in Stockton in 1771.
Olmsted felt that all of the submitted plans were subpar and either did not take into account flood control or focused too much on it and neglected the public park aspect. The Muddy River and Stony Brook flowed through the Back Bay Fens (an artificial marshland commonly referred to as the Fens) which were at the time subject to tidal flow, storm flooding, and sewage discharge. The disappointed park commission then asked Olmsted to be its professional adviser and main landscape architect. Under his direction, what is now called the Emerald Necklace took shape.
In 2014, the system added a "tidal spill trajectory animation." This provides an enhanced analysis of tidal flow influences on pollution spills in the Delaware Valley, improving response planning. Philadelphia Water received the 2015 Governor's Award for Environmental Excellence in Pennsylvania by the Pennsylvania Environmental Council (PEC) for the aforementioned "Delaware Valley Early Warning System – Tidal Spill Trajectory Tool." This award was given to the department for the innovation the system showed as well as the public safety benefits this customized web- based system presented, as it was specially made to safeguard water quality for millions of people in the greater Philadelphia area.
Dhal Char is one of the numerous islands situated in the delta of the Meghna river in the wider Ganges Delta region. The nearest other bodies of land are Char Kukri Mukri to the northeast and Char Nizam to the west, both similar, albeit larger islands. The eastern part of the island is witnessing rapid river bank erosion due to strong tidal flow of the Meghna as well as inclement weather in the Bay of Bengal. The island is marked as one of the most vulnerable areas for natural disasters and is regularly pummeled by cyclones in the northern Bay of Bengal ocean.
The bridge is owned and maintained by the Tamar Bridge and Torpoint Ferry Joint Committee, a conglomerate between Plymouth City Council and Cornwall County Council. It has a main span of three lanes, which use a tidal flow arrangement to maximise traffic flow at rush hour, and two outer lanes. The north of these is used as a local access route from Saltash, while the south is used by cyclists and pedestrians but could be converted to meet future vehicle demand if alternatives for pedestrians and bicycles were provided, a dedicated ferry, shuttle bus, cable car or bridge have been considered.
To complement the floodway, the Napindan Hydraulic Control System (NHCS) was built in 1983 at the confluence of the Marikina River and the Napindan Channel of the Pasig River to regulate the tidal flow of saline water between Manila Bay and the lake, and to prevent the intrusion of polluted water into the lake. It has a fully gated diversion dam at its head and was designed with a width of . Over 40,000 households are situated along the floodway's banks and these shoreline slums have reduced its effective width to . Kangkong is cultivated extensively in the floodway as well.
The Expressway was the first road in the United Kingdom to introduce tidal flow to allow better management of traffic. Lane use is controlled by means of electronic overhead signs, with one lane always closed to create a buffer between the two directions of travel – there is no central reservation. In the morning, four of the seven lanes are designated for use by traffic heading toward Birmingham city centre, and two lanes for traffic out of the city. In the evening rush hour, this pattern is reversed and four lanes are made available to outbound traffic and two lanes towards the city centre.
The waters of Cook Strait are dominated by strong tidal flows. The tidal flow through Cook Strait is unusual in that the tidal elevation at the ends of the strait are almost exactly out of phase with one another, so high water on one side meets low water on the other. Strong currents result, with almost zero tidal height change in the centre of the strait. Although the tidal surge should flow in one direction for six hours and then the reverse direction for six hours, a particular surge might last eight or ten hours with the reverse surge enfeebled.
In 1999, the Sand Lake estuary was one of three areas identified as a possible mitigation site for likely impacts to wetlands with improvements ro Sandlake-Galloway road. The mitigation recommended for the Sand Lake site was to breach the dike on the Beltz farm property, to allow for tidal flow into Sand Lake's fresh water marsh, to improve its estuarine ecology, and to restore high salt marsh habitat for fish and other animals. However, local residents were concerned that breaching the dike could cause flooding in Tierra Del Mar. The Salmon River was ultimately the site chosen for mitigation.
It is also reached by the tidal flows which come through the lagoon from the inlets of its coastal shoreline in its south. A coastal lagoon is formed by the conjoint interaction between the freshwater of the inland watercourses and of the saltwater of the sea and is subject to a delicate hydrologic equilibrium between these. The sea coastline is composed of the peninsulas of Cavallino and Sottomarina, which form the northern and southern part respectively, and the barrier islands of Lido and Pellestrina in the middle. Between these formations, three inlets (Lido, Malamocco and Chioggia) let the tidal flow come into the lagoon.
The reconstruction included modification of the whole bridge to accommodate an extra traffic lane, allowing for a peak period 'tidal flow' system of three lanes for major flow and two for the minor flow. Approximately one year after the bridge collapse, a temporary two lane Bailey bridge 788 m long, linking the eastern and western shores of the Derwent, was opened. Specialists in marine engineering undertook an extensive investigation to locate bridge debris. This survey took several months to complete, and parts of the bridge weighing up to 500 tons were accurately located using equipment developed by the University of Tasmania and the Public Works Department.
The East Harbor thus became a lake, connected to Provincetown Harbor only through a culvert in the dike, and in 1910, the U.S. Geologic Survey (USGS) officially renamed it Pilgrim Lake. In the ensuing years, the dike became clogged with vegetation, beginning a trend of desalination and oxygen-depletion that resulted in the demise of native wildlife populations, occasionally in the form of fish kills. In 2004, tidal flow was successfully restored by the National Park Service, working together with other local, state, and federal agencies. In the following year, for the first time since Abraham Lincoln was president, legal-size clams were found in East Harbor.
Ordnance Survey Plan, 1:5,280, published in 1850 Traffic soon proved to be very limited, and in the mid-1830s Lord Holland described the canal as a total failure. Indeed, it was such a fiasco that it became a regular feature of derision in the Punch magazine. The River Thames is tidal at the point where the canal joined it, so the canal was also tidal up to the lock near Kensington. The tidal flow brought silt into the canal and the feed from Counter's Creek was inadequate to clear it, so that problems were soon experienced with obstruction to the passage of vessels.
Spartina grass flourished in a tidal wetland before the restoration of the shore and beach area and the development of a shoreline urban park by the New York City Department of Parks and Recreation in the 1960s, blocking tidal flow to the area. The main channel dominates the neighborhood of Midland Beach, with the surrounding watershed covering the neighborhoods of Dongan Hills, Grant City and Todt Hill. The New York City Department of Environmental Protection has embarked on a vast Bluebelt project, which incorporates most of the east and south shores of Staten Island. Some of the indigenous flora include Rose Mallow, Soft Rush, and Bladder Sedge.
This feasibility study aims to consider all tidal range technologies, including barrages and lagoons. The focus is on tidal range technologies as this is where the energy potential in the Severn Estuary is the greatest, as opposed to 'tidal flow' which is the current in moving tidal waters. The tidal range in the Severn Estuary is the second highest in the world and can rise as much as 14 metres, meaning it has the potential to generate more renewable electricity than all other UK estuaries. This could create up to 5% of the UK's electricity, contributing significantly to UK climate change goals as well as European Union renewable energy targets.
The outflow of cold air from a thunderstorm can launch large amplitude internal solitary waves at an atmospheric inversion. In northern Australia, these result in Morning Glory clouds, used by some daredevils to glide along like a surfer riding an ocean wave. Satellites over Australia and elsewhere reveal these waves can span many hundreds of kilometers. Undulations of the oceanic thermocline can be visualized by satellite because the waves increase the surface roughness where the horizontal flow converges, and this increases the scattering of sunlight (as in the image at the top of this page showing of waves generated by tidal flow through the Strait of Gibraltar).
If this resource is to be successfully utilized, the technology required could form the basis of a major new industry to produce clean power for the 21st century. Contemporary applications of these technologies can be found here: List of tidal power stations. Since the effects of tides on ocean currents are so large, and their flow patterns are quite reliable, many ocean current energy extraction plants are placed in areas of high tidal flow rates Research on marine current power is conducted at, among others, Uppsala University in Sweden, where a test unit with a straight-bladed Darrieus type turbine has been constructed and placed in the Dal river in Sweden.
His position as a leading statesman brought Criccieth national and international prominence that it had never previously enjoyed; the town still has many locations connected with Lloyd George and his family.Number 10 : The Official Site of the Prime Minister's Office : History and Tour : David Lloyd George Retrieved 2009-08-19 Disaster struck Criccieth in October 1927; a great storm in the Irish Sea stopped the tidal flow, causing a double high tide. High seas and strong on-shore winds destroyed houses at Abermarchnad, the pressure of the waves punching holes through the back walls; the houses subsequently had to be demolished and the occupants rehoused.
Among a host of other things, this granted the barons the right of Navigation under Clause 23. Another major consequence of John's reign was the completion of the multi-piered London Bridge, which acted as a barricade and barrage on the river, affecting the tidal flow upstream and increasing the likelihood of the river freezing over. In Tudor and Stuart times, various kings and queens built magnificent riverside palaces at Hampton Court, Kew, Richmond on Thames, Whitehall and Greenwich. As early as the 1300s, the Thames was used to dispose of waste matter produced in the city of London, thus turning the river into an open sewer.
Baines has studied oceanography along with stratified fluids, and published articles using the two research areas together. This has included a study of internal (baroclinic) ocean tides, generated by tidal flow over topography such as submarine ridges, continental shelves and slopes, submarine canyons and seamounts. In 1984, he led an observational study of the oceanic flow through Bass Strait, which involved the only measurements to date of this significant throughflow. In 1989 he published a review paper about the oceanography of Australian waters as a whole, including the ocean currents and tides in the Indian and Southern Oceans, and the coastal oceanography of southern Australia.
Since the completion of his PhD, Eacott has focused on making accessible live performances using algorithmic composition as part of the organisation Informal. Floodtide, which premiered at Trinity Buoy Wharf, Docklands in June 2008, is a musical performance generated by tidal flow."FLOODTIDE a sonification of the tide", John Eacott, 3 November 2008 Floodtide works by submerging a sensor into tidal water, the data from which is transformed by custom computer software, into notation read live from computer screens by musicians. Floodtide has been performed numerous times, most notably at Southbank Centre's See Further-Festival of Science and Arts in 2010 and the Mayor's Thames Festival in 2009.
Following the 2010 Deepwater Horizon oil spill the entrance to Perdido Pass was closed, with a barrier system in June 2010, to control tidal flow of oil entering from the Gulf of Mexico. The daily high tide was causing oil-contaminated water to enter Perdido Bay. The barrier system was designed to allow boats to travel through Perdido Pass, during the outflowing tide, but close during the rising tide and collect oil deposits in a retention area on the eastern edge of the pass. During the disaster BP took over much of the Gulf State Park and used it for parking or storage of equipment.
Extract from Laver's Almanac for Liverpool and the Irish Sea, www.hmsconway.org. Retrieved 19 February 2014 What is termed 'slack' in the Swellies is actually a brief period of uneasy equilibrium between two opposing flood streams which typically occurs 1 hour 42 minutes before local high water, or at 09:08 on the morning of the move. Owing to the strength of the southwest-going ebb, which runs at 8 knots during a spring tide,Admiralty chart 1461 there is a confused complex tidal flow among the numerous rocks and islets generating many powerful eddies.Extract from the Anglesey and North Wales Coast Pilot, UK Hydrographic Office, p.
The Columbia River Estuary is the most downstream portion of the river that experiences ocean tides, generally defined as the furthest reach of the Columbia River plume to the Bonneville Dam. Here, a transition zone occurs where freshwater discharge from the river meets and mixes with Pacific Ocean saltwater. In this region, physical processes that affect nutrients are the circulation (entrance/exit, movement) of specific water masses with their nutrient load, the magnitude of tidal flow distributing ocean waters inland, and bottom sediment exchange affecting nutrient particle mobility. With the exception of nitrogen, the Columbia River estuary nutrient budget tends to be dominated by nutrient transport out of the system.
Two main rivers run into the haven, Ho Chung River at the west and Tai Chung River in the north west. Tides, sea currents and river drifts form alleviates and beaches in the haven, although the tidal flow is of minimal strength. A number of smaller streams run into the haven, notably one at the extreme north western edge, just north of Pak Sha Wan. The mangrove area surrounding this stream is a good place in Hong Kong to see the black- capped kingfisher, it is not scenic, small in area and it can be accessed at high tide by dinghy only, nevertheless black-capped kingfishers are commonly sighted.
The timing is relative to high water at some harbour where the tidal behaviour is similar in pattern, though it may be far away. As with tide height predictions, tide flow predictions based only on astronomical factors do not incorporate weather conditions, which can completely change the outcome. The tidal flow through Cook Strait between the two main islands of New Zealand is particularly interesting, as the tides on each side of the strait are almost exactly out of phase, so that one side's high water is simultaneous with the other's low water. Strong currents result, with almost zero tidal height change in the strait's center.
Nicolson's work Waterline, exhibited in 2018 at the Birmingham Museum of Art, gives focus to sacred and life-sustaining waterways. The form of the sculpture is derived from traditional bentwood boxes. The images that are presented as the light moves up and down, mimicking the tidal flow of waters, show animals and symbols important to Nicolson's Kwakwaka’wakw heritage. The installation references ancient Kwakwaka’wakw cliff pictographs that are in danger of being lost because of industrial structures now control the rise and fall of river-water levels and indigenous sites, causing ancient Kwakwaka’wakw pictographs on cliffs and river rocks to disappear under rising water, and then reemerge.
Bass Strait is a generally shallow (average depth of ) stretch of water approximately wide and from north to south, encompassed by the entire northern coastline of Tasmania and Victoria's central to eastern coast. The prevailing winds and currents are westerly, the latter being divided by King Island, Tasmania at the western entrance to the strait, causing unpredictable sea conditions, especially when strong winds occur. For example, strong southerly winds can cause a strong northerly current reflecting from the Victorian coast. The combination of winds, currents, tidal flow and the shallow bottom often lead to tall waves, often of short length, with a confused short swell often conflicting in direction.
SeaGen was a full- scale tidal flow power station that produced electricity on 14 July 2008. However, subsequently a computer problem caused damage to one of the rotors and procuring a replacement took until towards the end of October 2008. However SeaGen was able to operate using just its good rotor through the summer of 2008 and that rotor was operated at full rated power of 600 kW for many hours. After replacement of the damaged rotor SeaGen delivered its full rated power of 1.2MW for the first time on 18 December 2008 - believed to be the first time a "wet renewable energy system" has delivered in excess of 1MW.
The excellent tidal flow makes it suitable for the farming of Pacific Oysters, which are regarded as some of the best quality produced in South Australia. Tourism is an important economic drive for the town, with tourists flocking to the area at Easter and over the summer holidays. Fishing for many species including King George and Silver whiting, Garfish, Mullet, Flathead, Snapper, Tommy Ruff, Snook, Yellowfin Whiting, squid and crabs is very popular, with other forms of water sport available further up the coastline. There are other attractions such as Cowell Jade, which showcases the region’s Jade, as well as numerous scenic drives, some of which are suitable for 4x4 only.
Illustration were described as playing futurist and early electronic music. Formed in 1979 by Tony Harrison and Timm Johnson, the group were together for approximately 3 years, rehearsing in the cellar of a clothes shop called 'Off The Rails' at the Little Underbank in Stockport, where the band was based. The group was composed of Tony Harrison on Vocals, Tim Johnson on guitar Paul Lancaster on bass, Julia Adamson on Keyboards and George Terry, now known as Morgan King, on drums. With manager Graham Cooper, the group made various demos for record companies and agreed to release one of these songs, Tidal Flow, taken from a demo engineered and produced by Phil Ault, on the Some Bizzare Album.
Due to the variation in ground level on each shore there is a grade of 2.68% from south to north. Traffic across the bridge is regulated by traffic lights at either end (located at the end of Spans 2 and 6) and by roadway gates which operate as the bridge is about to open. The bridge has two traffic lanes in each direction, with a tidal flow system established, while the approaches to it have three lanes in each direction. In 2007, the Roads and Traffic Authority found that traffic either side of the bridge doesn't return to normal for 15 minutes after the bridge is opened and reduced the number of bridge opening times.
The original island was created as an outwash deposit during a brief pause in the last glacial retreat from melt water runoff carrying eroded sand down a stream from the high hills (Love Lane and Cowesett Hills area) forming a small navigable river mouth called Arnold's Cove suitable only by skiffs and small sailboats (cc. 1800s). The island's tidal flow between Greenwich Cove to the South and Chepiwanoxet Beach to the North kept the small cove open with a navigable channel for small boat use more so at high tide and presumably good shellfishing in low tide. Early bay navigation charts (e.g. 1777 Charles Blaskowitz; US Geological Survey 1891 Atlas of Rhode Island; ca.
Additional advantages include a densely populated hinterland and close proximity to London, and excellent rail and road links to the rest of Britain which bypass the congestion of London. The average tidal range is approximately 5 feet (1.5 metres), with 17 hours per day of rising water thanks to the port's "double tides". These allow the largest container and cruise ships access to the port for up to 80 per cent of the time, according to the container terminal operator DP World Southampton. The effect is a result of tidal flow through the English Channel: high tide at one end of the Channel (Dover) occurs at the same time as low tide at the other end (Land's End).
Lorentz was also asked by the Dutch government to chair a committee to calculate some of the effects of the proposed Afsluitdijk (Enclosure Dam) flood control dam on water levels in the Waddenzee. Hydraulic engineering was mainly an empirical science at that time, but the disturbance of the tidal flow caused by the Afsluitdijk was so unprecedented that the empirical rules could not be trusted. Originally Lorentz was only supposed to have a coordinating role in the committee, but it quickly became apparent that Lorentz was the only physicist to have any fundamental traction on the problem. In the period 1918 till 1926, Lorentz invested a large portion of his time in the problem.
The Koshi Barrage of Nepal A barrage dam is a special kind of dam which consists of a line of large gates that can be opened or closed to control the amount of water passing the dam. The gates are set between flanking piers which are responsible for supporting the water load, and are often used to control and stabilize water flow for irrigation systems. An example of this type of dam is the now-decommissioned Red Bluff Diversion Dam on the Sacramento River near Red Bluff, California. Barrages that are built at the mouths of rivers or lagoons to prevent tidal incursions or utilize the tidal flow for tidal power are known as tidal barrages.
The gravitational attraction that the Moon exerts on Earth is the cause of tides in the sea; the Sun has a smaller tidal influence. If Earth had a global ocean of uniform depth, the Moon would act to deform both the solid Earth (by a small amount) and the ocean in the shape of an ellipsoid with the high points roughly beneath the Moon and on the opposite side of Earth. However, because of the presence of the continents, Earth's much faster rotation and varying ocean depths, this simplistic visualisation does not happen. Although the tidal flow period is generally synchronized to the Moon's orbit around Earth, its relative timing varies greatly.
Hurst Spit is a hook-shaped shingle spit which extends for from the Hampshire shore into the Solent towards the Isle of Wight. The spit forms a barrier which shelters a Site of Special Scientific Interest known as Hurst Castle And Lymington River Estuary. To reach the end of the spit one can either catch the seasonal ferry from Keyhaven, or follow the footpath (part of the Solent Way) along the top of the spit. The sea route past Hurst Spit can be hazardous to boats because the constriction to the tidal flow caused by the spit creates strong tidal streams, as well as spiky waves mixed with circular areas of flat sea caused by the upwelling water.
Operation Sealion, p.162. One complication was the tidal flow in the English Channel, where high water moves from west to east, with high water at Lyme Regis occurring around six hours before it reaches Dover. If all the landings were to be made at high water across a broad front, they would have to be made at different times along different parts of the coast, with the landings in Dover being made six hours after any landings in Dorset and thus losing the element of surprise. If the landings were to be made at the same time, methods would have to be devised to disembark men, vehicles and supplies at all states of the tide.
Some aquatic turtles can also pump water into a highly vascularised mouth or cloaca to achieve gas-exchange. Crocodiles have a structure similar to the mammalian diaphragm - the diaphragmaticus - but this muscle helps create a unidirectional flow of air through the lungs rather than a tidal flow: this is more similar to the air-flow seen in birds than that seen in mammals. During inhalation, the diaphragmaticus pulls the liver back, inflating the lungs into the space this creates. Air flows into the lungs from the bronchus during inhalation, but during exhalation, air flows out of the lungs into the bronchus by a different route: this one-way movement of gas is achieved by aerodynamic valves in the airways.
The monument on Flagler Memorial Island Florida Photographic Collection, 1922 Unlike the Venetian Islands, the perfectly rounded shape of the memorial island was not protected by a sea wall. The powerful tidal flow from Government Cut, as well as hurricanes and other forces, have drastically altered its original shape. Exotic species such as Burma reed (Neyraudia reynaudiana), seaside-mahoe (Thespesia populnea) and beach naupaka (Scaevola taccada)Island Restoration and Enhancement in Biscayne Bay, Florida have covered much of the island. In 1994 the Biscayne Bay Environmental Enhancement Trust Fund and the Florida Inland Navigation District used a $220,000 bond to build a clearing in the center of the island near the monument, where visitors play volleyball and light bonfires.
The freeway originally consisted of four lanes, and crossed the Lacey V. Murrow Floating Bridge. In the early 1950s, an interchange was built at Rainier Avenue and the highway extended 1 mile closer to Seattle's city centre along "Corwin Place". In the early 1960s, traffic congestion forced the Department of Highways to institute a tidal flow system, in which three lanes, controlled by overhead signals went into Seattle in the morning, and the toward Bellevue in the afternoon. In 1968, improvements to the east of Mercer Island were made; the highway was widened to up to 6 lanes in each direction and the interchange with I-405 was upgraded from a cloverleaf to a fully directional interchange.
The southern part of the Lagoon of Venice, having lost the sediment input for the Brenta, became exposed to the erosive effect of the tidal flow, which led to a decrease in its above-water lands, a reduction of its saltmarshes and the progressive erosion of its inner deltas and of the fluvial channels that cross it. A new canal, the Taglio Novissimo, was dug between 1610 and 1791 to divert the waters of the rivers Magra, Muson, Bottenigo, Volpago, Bionca and Tergola as well as those of the Brenta. It started further east than the Brenta Nova (at Mira) and was thus longer than the Brenta Nova. It run a similar course and most of it was along the edge of the lagoon.
The Titus Mill Pond State Tidal Wetlands are a protected natural resource area subject to the jurisdiction of the New York State Department of Environmental Conservation (NYSDEC). They are situated at the eastern edge of the pond, where the Davenport Neck peninsula connects to the mainland, and are classified as a "formerly connected tidal wetlands zone in which normal tidal flow is restricted by man-made causes", or in this instance, the Lispenard-Titus grist-mill and dam. The Titus Mill Pond wetland area is an intertidal marsh(IM) consisting of a vegetated, tidal wetland zone lying between the average high and low tidal elevation of New Rochelle Harbor and the Titus Mill Pond. The predominant vegetation here is low marsh cordgrass, Spartina alterniflora.
The remains of an old putcher rank, where baskets were placed to allow fish to swim in at high tide and for the fishermen to retrieve them at low tide; at Whitson near Newport, Wales A strong timber frame or "rank" was required to hold the rows of putchers, built across the main tidal flow of the river. The fish, with fins trapped by the weave and unable to easily swim backwards, were then trapped in the conical baskets. The very high difference between high and low tide in the Severn Estuary enabled the ranks to be long and thus economically productive. Goldcliff originally had three ranks – the "Flood", the "Ebb" and the "Putt", able to carry a total of 2,327 baskets.
The bore may be more than six feet high and travel at 15 miles per hour on high spring tides and opposing winds. Turnagain Arm sees the largest tidal range in United States, with a mean of 30 feet (9.2 m), and the fourth highest in the world, behind Bay of Fundy (11.7m), Ungava Bay (9.75m), and Bristol Channel (9.6m). The ocean's natural 12-hour 25-minute tidal cycle is close to Turnagain Arm's natural resonance frequency, which then reinforces the tide similar to water sloshing in a bathtub. Tidal fluctuations in the main body of Cook Inlet, while not as extreme as the shallow and narrow Turnagain Arm, regularly reach or more and exhibit currents in excess of at full tidal flow.
A publicity campaign fronted by actress Diana Dors in favour of reopening the bridge was launched, whilst a lobbying group of local residents led by poet Robert Graves campaigned in support of the GLC's plan. Graves's campaign collected over a thousand signatures in support, but was vigorously attacked by the British Road Federation, who derided the apparent evidence of public support for the scheme as "sending a lot of students around to council flats [where] most people will sign anything without knowing what it is all about". A public inquiry of 1974 recommended that the bridge remain open to avoid congestion on neighbouring bridges, and it remained open to traffic with the tidal flow and 2-ton weight limit in place.
The barrier transfer machine moving the barrier for the afternoon/evening traffic rush A "tidal flow" system is in place, with the direction of the two centre lanes changed to provide an additional lane for peak-period traffic. During the morning peak, five of the eight lanes are for southbound traffic; in the afternoon, five lanes are northbound. At other times, the lanes are split evenly, but peak traffic has become proportionately less – in 1991 there was often a higher than 3:1 difference in directional traffic; in 2006, this had dropped to around 1.6:1. The bridge has an estimated capacity of 180,000 vehicles per day, and in 2006 had an average volume of 168,754 vehicles per day (up from 122,000 in 1991).
During the Peninsular War the British army transported "tin pontoons" that were lightweight and could be quickly turned into a floating bridge. Lt Col Charles Pasley of the Royal School of Military Engineering at Chatham England developed a new form of pontoon which was adopted in 1817 by the British Army. Each pontoon was split into two halves, and the two pointed ends could be connected together in locations with tidal flow. Each half was enclosed, reducing the risk of swamping, and the sections bore multiple lashing points. The "Palsey Pontoon" lasted until 1836 when it was replaced by the "Blanshard Pontoon" which comprised tin cylinders 3 feet wide and 22 feet long, placed 11 feet apart, making the pontoon very buoyant.
The harbour of Gorey, Jersey falls dry at low tide. The shape of the shoreline and the ocean floor changes the way that tides propagate, so there is no simple, general rule that predicts the time of high water from the Moon's position in the sky. Coastal characteristics such as underwater bathymetry and coastline shape mean that individual location characteristics affect tide forecasting; actual high water time and height may differ from model predictions due to the coastal morphology's effects on tidal flow. However, for a given location the relationship between lunar altitude and the time of high or low tide (the lunitidal interval) is relatively constant and predictable, as is the time of high or low tide relative to other points on the same coast.
An agreement has been made with Canada's Maritime Tidal Energy Corporation in 2007 to develop tidal resources in the Bay of Fundy.Agreement with MTEC With a tidal range exceeding , and flows of up to , this area has long been favoured as the most promising source of tidal power and the newer tidal flow concepts mean that the associated shipping and environmental problems of barrage schemes are no longer prohibitive. MTEC concluded that MCT had the most proven technology of the companies evaluated.Arrangement with Maritime Tidal Energy Corporation On the west coast, they have also agreed to install at least three 1.2 MW turbines in the Campbell River in British Columbia as a first step in developing tidal farms in that river and other tidal waters.
The former has also had the consequence of worsening the aqua alta phenomenon (high water, the floods which can occur in Venice and the lagoon with above average high tides). As a result, the expansion works were suspended in 1969 and the plan was scrapped in 1973. Casse di colmata To try to alleviate these problems a number of channels which had been filled in to create the islands were reopened to reconnect the waters behind these islands to the rest of the lagoon. These are the Volpego and Fiumesino, which cut through the cassa B, the Taglio Vecchio and Mattoni, which cut through the cassa B and the Avesa, which cuts through the cassa A. The area of the lagoon which can absorb the tidal flow has decreased by about 30% since 1791.
In 2008 a 1/10 scale Evopod device was installed and tested in the tidal flow through Strangford Narrows near Portaferry, Northern Ireland. Over a period of two years the device collected data but was not connected to the grid under the Supergen Marine Energy Research ProgrammeSupergen Marine Energy Annual Assembly - Prof Trevor Whittaker, Dr Graeme Savage, Dr Matt Folley, Mr Cuan Boake (1-10-2008) "Progress Towards the Sea" (PDF) Retrieved on 21-8-2012 in collaboration with Queen's University Belfast, amongst others. In 2011 the device was upgraded to include a power export solution which feeds Evopod's generated power onshore to the Queen's University Marine Laboratory. The power is currently fed into the mains circuit of the Marine Laboratory, with plans to be fully grid connected in the near future.
Victoria Road is predominantly three lanes in each direction between Rozelle and Gladesville, and two or three lanes in each direction west of Gladesville. A large number of State Transit bus routes travel along Victoria Road, and during peak hours much of the road includes a dedicated bus lane. In July 1955, a new four (later five) lane Iron Cove Bridge opened, followed in October 1964 by a new six (later seven) lane Gladesville Bridge, both replacing 1880s built two-lane structures. In 2011, the Inner West Busway project introduced a tidal flow arrangement between Drummoyne and Rozelle which provides four city bound lanes (including a dedicated bus lane) and two west bound lanes in the morning peak, before reverting to three lanes in each direction at 10am.
The south end of Lions Gate Bridge in Vancouver, Canada A reversible lane (British English: tidal flow) is a lane in which traffic may travel in either direction, depending on certain conditions. Typically, it is meant to improve traffic flow during rush hours, by having overhead traffic lights and lighted street signs notify drivers which lanes are open or closed to driving or turning. Reversible lanes are also commonly found in tunnels and on bridges, and on the surrounding roadways – even where the lanes are not regularly reversed to handle normal changes in traffic flow. The presence of lane controls allows authorities to close or reverse lanes when unusual circumstances (such as construction or a traffic mishap) require use of fewer or more lanes to maintain orderly flow of traffic.
Internal waves (marked with arrows), caused by tidal flow through the Strait of Gibraltar and made visible by sea surface roughness enhance sunlight backscatter Internal waves are gravity waves that oscillate within a fluid medium, rather than on its surface. To exist, the fluid must be stratified: the density must change (continuously or discontinuously) with depth/height due to changes, for example, in temperature and/or salinity. If the density changes over a small vertical distance (as in the case of the thermocline in lakes and oceans or an atmospheric inversion), the waves propagate horizontally like surface waves, but do so at slower speeds as determined by the density difference of the fluid below and above the interface. If the density changes continuously, the waves can propagate vertically as well as horizontally through the fluid.
The motorway ended at a set of traffic lights on the top of a hill, giving limited visibility to motorway traffic. In 1984 a two-lane expressway opened, continuing from Sunset Road to Greville Road and on towards Albany Highway Albany Village. On 30 March 1984, the last tolls were collected for the Harbour Bridge, making the entire Northern Motorway free of charge from 31 March 1984. In the 1980s, tidal flow was introduced on the Auckland Harbour Bridge to assist with peak flows on the Northern Motorway between the North Shore and central Auckland. The two central lanes were made reversible to allow a 5+3 split favouring the peak direction (southbound in the morning, northbound in the evening) during peak hours, and 4+4 off-peak.
By the 1930s, capacity was becoming inadequate, and consequently a second bore opened in 1967, handling southbound traffic while the earlier 19th century tunnel handles northbound. The northern approach takes traffic from the A12 and the southern approach takes traffic from the A2, making the tunnel crossing a key link for both local and longer-distance traffic between the north and south sides of the river. It forms part of a key route into Central London from South East London and Kent and was the easternmost all-day crossing for vehicles before the opening of the Dartford Tunnel in 1963. It remains the easternmost free fixed road crossing of the Thames, and regularly suffers congestion, to the extent that tidal flow schemes were in place from 1978 until controversially removed in 2007.
Matches against well known clubs in the top two divisions of the English football league system attracted considerable interest, with attendances averaging over 28,000 in the Second Division. Further improvements were implemented after this first season in The Football League; a roof was erected over the new Canton Stand, the spectator banks were raised and the pitch was relaid with sea-washed turf, a fine variety of grass grown on the coast that is cleansed by tidal flow. The club stated that the new playing surface was "now equal to the best in the country." Attendances rose again as Cardiff won promotion to the First Division after one season. The opening match of the 1921–22 season attracted a crowd of over 55,000 for a 1–0 defeat by Tottenham Hotspur.
Finns Point is a small strategic promontory in Pennsville Township, Salem County, New Jersey, and New Castle County, Delaware, located at the southwest corner of the cape of Penns Neck, on the east bank of the Delaware River near its mouth on Delaware Bay. Due to the wording of the original charter defining the boundaries of New Jersey and Delaware, part of the promontory is actually enclosed within the state of Delaware's border, due to tidal flow and the manner in which the borders between New Jersey and Delaware were first laid out. Therefore, this portion of Finns Point is an exclave of Delaware, cut off from the rest of the state by Delaware Bay.Schoonejongen, John. "How Delaware got on Jersey’s side of the river", Asbury Park Press, September 10, 2010.
In 1875, the voters of the City of Boston and the Massachusetts legislature approved the creation of a park commission in order to promote the creation of public parks in the city. Frederick Law Olmsted, the landscape architect of New York City's Central Park, began to spend an increasing amount of time in the area and was asked by the park commission in the mid-to-late 1870s to be the judge of a 23-entry design competition to build a new park. Olmsted felt that all of the submitted plans were subpar and either did not take into account flood control or focused too much on it and neglected the public park aspect. The Muddy River and Stony Brook flowed through the Back Bay Fens (the Fens) which were at the time subject to tidal flow, storm flooding, and sewage discharge.
An oil refinery was also built.Relazione sul Piano Regolatore Portuale Porto di Venezia - Le origini e la storia The sediments which were dredged to create the Malamocco-Marghera canal were used to create artificial islands, the casse di colmata A, (155 hectares), B, (385 ha) and D-E (752 ha), for the creation of a third industrial area at the port of Marghera. The original plan envisaged further artificial islands that would fill in the whole of the saltmarsh area between Marghera and Chioggia, in the southern part of the lagoon. However, studies carried out by scientists after the disastrous 1966 flood in Venice and the lagoon showed that the islands reduced the area in which the tidal flow could expand and that this had an impact both on lagoon's water level and the efficiency of water turnover in the lagoon.
An example of this is on the M5 motorway as it climbs up the side of the Gordano Valley south of Bristol. In Birmingham and many other cities, suburban dual carriageways may have trees or cycle lanes in the middle as a wide central reservation. Two examples on the UK road network where the carriageways are several hundred yards/metres apart, are on a section of the M6 between Shap and Tebay, which allows a local road to run between them, and on the M62 where the highest section through the Pennines famously splits wide enough to contain a farm.Google Maps The other major exception is the A38(M) Aston Expressway, which is a single carriageway of seven lanes, where the median lane moves to account for traffic flow (a system known as tidal flow or reversible lane).
Aerial view of the Safety Valve from southern end of Key Biscayne (top) to Soldier Key The Safety Valve is a series of shallow sand flats separated by tidal flow channels, stretching about from the south end of Key Biscayne to the Ragged Keys at the north end of the Florida Keys. The term "safety valve" was applied to the tidal flats by Ralph Munroe, who argued against building a causeway and bridges connecting Key Biscayne to the Ragged Keys and beyond on the grounds that such construction would block the free outflow of storm surges from the bay across the flats to the ocean. It is believed that it does moderate the effects of storm surges on the bay. The transportation of sand southward along the Atlantic Coast of Florida by longshore drift ends in the area of the Safety Valve.
Alfords Point Bridge is a twin concrete and steel box girder road bridge that carries Alford Point Road as state route A6 across the lower Georges River between Padstow Heights in the City of Bankstown and Alfords Point in the Sutherland Shire in Sydney, New South Wales, Australia. The first bridge opened on 7 September 1973 and although the deck was built wide enough to accommodate three lanes of traffic, carried one lane of traffic in each direction. In 1980 the lane arrangements on the bridge were changed to provide a third lane, and a tidal-flow traffic management system was introduced, with two lanes northbound in the morning and two lanes southbound in the evenings. When the first bridge was built, a second set of piles and abutments was built a few metres downstream, allowing for future duplication.
The project is capable of generating 6 megawatts of electricity. Because the project is located upstream of Snoqualmie Falls, a natural barrier to migrating salmon, it poses no threat to salmon. Calligan Creek Hydro Project: in 2018, the utility completed a run-of-the-river hydro project on Calligan Creek located in King County, Washington. The project is capable of generating 6 megawatts of electricity. Because the project is located upstream of Snoqualmie Falls, a natural barrier to migrating salmon, it poses no threat to salmon. Tidal Energy: In 2007, the utility began to explore tidal energy;Overview,” in April 2009 the PUD selected OpenHydro,Selected,” a company based in Ireland, to develop turbines and equipment for eventual installation. The project as initially designed was to place generation equipment in areas of high tidal flow and operate that equipment for 4 to 5 years.
The Snohomish PUD, a public utility district located primarily in Snohomish county, Washington State, began a tidal energy project in 2007;Overview,” in April 2009 the PUD selected OpenHydro,Selected,” a company based in Ireland, to develop turbines and equipment for eventual installation. The project as initially designed was to place generation equipment in areas of high tidal flow and operate that equipment for four to five years. After the trial period the equipment would be removed. The project was initially budgeted at a total cost of $10 million, with half of that funding provided by the PUD out of utility reserve funds, and half from grants, primarily from the US federal government. The PUD paid for a portion of this project with reserves and received a $900,000 grant in 2009 and a $3.5 million grant in 2010 in addition to using reserves to pay an estimated $4 million of costs.
According to A Dictionary of British Place Names, Guyhirn, which was 'La Gyerne' in 1275, derives from the Old French 'guie', which means "a guide" (referencing the control of tidal flow or a "salt-water ditch"), with the Old English 'hyrne', which means an "angle or corner of land".Mills, Anthony David (2003); A Dictionary of British Place Names, Oxford University Press, revised edition (2011), p.217. According to folklore, recorded in the early nineteenth century, Guyhirn was the site of "a severe engagement between a Saxon King and the abbot of Ely... the legend informs us that 5000 men were brought into the field... it arose from disputes respecting the boundaries of property." The village is on the opposite bank of the River Nene to Ring's End where John Morton, Bishop of Ely, erected a tower house to oversee his new drain, Morton's Leam, one of the oldest fenland drains, in the late fifteenth century.
In some areas, such as California, highway medians are sometimes no more than a demarcated section of the paved roadway, indicated by a space between two sets of double yellow lines. Such a double-double yellow line or painted median is legally similar to an island median: vehicles are not permitted to cross it, unlike a single set of double yellow lines which may in some cases permit turns across the line.. This arrangement has been used to reduce costs, including narrower medians than are feasible with a planted strip, but research indicates that such narrow medians may have minimal safety benefit compared to no median at all. The medians of United States Interstate Highways break only for emergency service lanes, with no such restrictions on lower classification roads. On British motorways, the median is never broken (except on the tidal flow of Aston Expressway), but there are no such restrictions on other dual carriageways.
A great example of this symbiosis are the mangroves in the Persian gulf, which require tidal flow and a combination of fresh and salt water for growth, and act as nurseries for many crabs, small fish, and insects; these fish and insects are the source of food for many of the marine birds that feed on them. Mangroves are a diverse group of shrubs and trees belonging to the genus Avicennia or Rhizophora that flourish in the salt water shallows of the Persian gulf, and are the most important habitats for small crustaceans that dwell in them. They are as crucial an indicator of biological health on the surface of the water, as the corals are to biological health of the Persian gulf in deeper waters. Mangroves' ability to survive the salt water through intricate molecular mechanisms, their unique reproductive cycle, and their ability to grow in the most oxygen-deprived waters have allowed them extensive growth in hostile areas of the Persian gulf.
Also significant about Sechelt Inlet are, near the inlet's mouth, the Sechelt Rapids within the Skookumchuck Narrows, which rage with near waterfall-like fury during tidal flow, both incoming and outgoing. Other fjords on the British Columbia Coast have similar rapids, also called skookumchucks (strong waters in the Chinook Jargon, the old coastal trade language), which like Sechelt Inlet are caused by the typical shallows and narrows near the mouth of a fjord as the volume of water inside the fjord's depths tries to pour out to, or in from, the more open waters beyond. In Sechelt Inlet's case, the Skookumchuck Narrows are exactly as its name describes - narrow - forcing the water to an even greater torrent than is typical elsewhere. Sechelt Inlet has two side-inlets, Salmon Inlet, which begins at a small power dam at the mouth of the Clowhom River and is about in length, and Narrows Inlet, which starts at the mouth of the Tzoonie River and includes the Tzoonie Narrows.
Three Mills Lock is a lock in the channel to allow passage of freight for the London 2012 Olympics by a process of canalisation (with the result of stopping the tidal flow) on the channel and the River Lee northwards. It was constructed between March 2007 East End rivers set for upgrade (BBC News) and June 2009."Waterway revived as Olympic route", BBC News 5 June 2009 The project was credited with offering additional benefits:- "As well as helping barges carrying construction materials and recyclables between Stratford and the River Thames, the lock will also create new opportunities for leisure boats, water taxis, trip boats and floating restaurants." A major benefit for British Waterways was the increased value of the land which it holds in areas no longer subject to flooding, which it was expected would exceed the cost of the project. The lock is 62 metres long, 8 metres wide and 2.4 metres deep, and can hold two 350 tonne barges (other locks on the Lower Lee limited barges to about 120 tonnes).
A ferry route between Torpoint and Plymouth Dock (now called Devonport) was created by an Act of Parliament in 1790 and the Earl of Mount Edgcumbe began to run ferries the following year. In 1826 the ferry operations were taken over by the Torpoint Steamboat Company, which built landing piers on both sides of the Tamar. The company also built the steam ferry Jemima which entered service in 1831. The steamer was unable to hold a course in the strong tidal flow of the Hamoaze, so it was soon withdrawn and the older ferryboats returned to service. The steamboat company approached James Meadows Rendel in 1832 and asked him to design a steam-powered floating bridge for the route. Two ferries were built in 1834 and 1835 and provided a continuous service, operating in alternate months. The tolls varied between 2d for a horse and 5s for a coach with 4 horses, with a double fare charged on Sundays. The original ferries were replaced by two new ferries built in 1871 and 1878. As a result of increasing traffic, the ferry company investigated twin ferry operations in 1905.

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