A strait is a water body connecting two seas or two water basins. While the landform generally constricts the flow, the surface water still flows, for the most part, at the same elevation on both sides and through the strait in both directions. In some straits there may be a dominant directional current through the strait. Most commonly, it is a narrowing channel that lies between two land masses . Some straits are not navigable, for example because they are either too narrow or too shallow, or because of an unnavigable reef or archipelago . Straits are also known to be loci for sediment accumulation. Usually, sand-size deposits occur on both the two opposite strait exits, forming subaqueous fans or deltas .
50-581: The Endeavour Strait is a strait running between the Australian mainland Cape York Peninsula and Prince of Wales Island in the extreme south of the Torres Strait , in northern Queensland , Australia . It was named in 1770 by explorer James Cook , after his own vessel, HMS Endeavour , and he used the strait as passage out to the Indian Ocean on his voyage. The Endeavour Strait
100-560: A bridge. Calmer waters may also allow better recreation in the bay or estuary. In August 2004, a humpback whale swam through the open sluice gate of the Annapolis Royal Generating Station at slack tide, ending up trapped for several days before eventually finding its way out to the Annapolis Basin . Environmentally, the main concerns are blade strike on fish attempting to enter the lagoon ,
150-491: A later period of time. Geographically dispersed tidal lagoons with a time delay between peak production would also flatten out peak production providing near baseload production at a higher cost than other alternatives such as district heating renewable energy storage. The cancelled Tidal Lagoon Swansea Bay in Wales, United Kingdom would have been the first tidal power station of this type once built. Dynamic tidal power (or DTP)
200-476: A median value of 23.8 gCO 2 -eq/kWhe. This is in line with the impact of other renewables like wind and solar power, and significantly better than fossil-based technologies. The Tethys database provides access to scientific literature and general information on the potential environmental effects of tidal energy. The main environmental concern with tidal energy is associated with blade strike and entanglement of marine organisms as high-speed water increases
250-451: A result, the production period of each generating unit is reduced, lower metal consumption is needed and technical efficiency is greater. A possible risk is rising sea levels due to climate change, which may alter the characteristics of the local tides reducing future power generation. The high load factors resulting from the fact that water is around 800 times denser than air, and the predictable and reliable nature of tides compared with
300-508: A tidal energy project in 2007. In April 2009 the PUD selected OpenHydro, 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
350-454: 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 part of this project from 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. In 2010 the budget estimate
400-477: Is a theoretical technology that would exploit an interaction between potential and kinetic energies in tidal flows. It proposes that very long dams (for example: 30–50 km length) be built from coasts straight out into the sea or ocean, without enclosing an area. Tidal phase differences are introduced across the dam, leading to a significant water-level differential in shallow coastal seas – featuring strong coast-parallel oscillating tidal currents such as found in
450-475: Is approximately 48 kilometres (30 mi) in length from its northernmost tip to its southern extremities, and varies from 3.2 to 9.7 kilometres (2 to 6 mi) in breadth. The strait is, on average, between 13 and 15 metres (7 and 8 fathoms) deep, and its sandy floor is carpeted with a moderately thick layer of coral . The strait is generally safe to travel through, and is not littered with any major sunken dangers or foul ground, although, for larger vessels, there
500-724: Is harnessed by converting energy from tides into useful forms of power, mainly electricity using various methods. Although not yet widely used, tidal energy has the potential for future electricity generation . Tides are more predictable than the wind and the sun . Among sources of renewable energy , tidal energy has traditionally suffered from relatively high cost and limited availability of sites with sufficiently high tidal ranges or flow velocities, thus constricting its total availability. However many recent technological developments and improvements, both in design (e.g. dynamic tidal power , tidal lagoons ) and turbine technology (e.g. new axial turbines , cross flow turbines ), indicate that
550-581: Is potential danger at the strait's western end, at the point that it connects with the Arafura Sea , where the depth of the water is only around 5.5 metres (3 fathoms). The danger that this shallow western point presents was a barrier that the Dutch explorers of Australia never overcame in their earlier sea explorations of the region. If they had been able to pass through the Endeavour Strait at
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#1732772648277600-401: Is typically reserved for much larger, wider features of the marine environment. There are exceptions, with straits being called canals; Pearse Canal , for example. Straits are the converse of isthmuses . That is, while a strait lies between two land masses and connects two large areas of ocean, an isthmus lies between two areas of ocean and connects two large land masses. Some straits have
650-515: The Middle Ages , or even from Roman times . The process of using falling water and spinning turbines to create electricity was introduced in the U.S. and Europe in the 19th century. Electricity generation from marine technologies increased an estimated 16% in 2018, and an estimated 13% in 2019. Policies promoting R&D are needed to achieve further cost reductions and large-scale development. The world's first large-scale tidal power plant
700-468: The Suez Canal . Although rivers and canals often provide passage between two large lakes, and these seem to suit the formal definition of strait, they are not usually referred to as such. Rivers and often canals, generally have a directional flow tied to changes in elevation, whereas straits often are free flowing in either direction or switch direction, maintaining the same elevation. The term strait
750-534: The seabed and in turbulence . This loss of energy has caused the rotation of the Earth to slow in the 4.5 billion years since its formation. During the last 620 million years the period of rotation of the Earth (length of a day) has increased from 21.9 hours to 24 hours; in this period the Earth-Moon system has lost 17% of its rotational energy. While tidal power will take additional energy from
800-509: The Atlantic Ocean and North Sea. This area has a very strong tidal current, which can travel up to 4 m/s (8.9 mph; 7.8 kn; 14 km/h) in spring tides. Tidal energy developers that have tested at the site include: Alstom (formerly Tidal Generation Ltd); ANDRITZ HYDRO Hammerfest; Atlantis Resources Corporation; Nautricity; OpenHydro; Scotrenewables Tidal Power; Voith. The resource could be 4 TJ per year. Elsewhere in
850-498: The Earth's internal heat , which comes from a combination of residual heat from planetary accretion (about 20%) and heat produced through radioactive decay (80%). A tidal generator converts the energy of tidal flows into electricity. Greater tidal variation and higher tidal current velocities can dramatically increase the potential of a site for tidal electricity generation. On the other hand, tidal energy has high reliability, excellent energy density, and high durability. Because
900-466: The Earth's tides are ultimately due to gravitational interaction with the Moon and Sun and the Earth's rotation, tidal power is practically inexhaustible, and is thus classified as a renewable energy resource. Movement of tides causes a loss of mechanical energy in the Earth-Moon system: this results from pumping of water through natural restrictions around coastlines and consequent viscous dissipation at
950-684: The UK, China, and Korea. The first study of large scale tidal power plants was by the US Federal Power Commission in 1924. If built, power plants would have been located in the northern border area of the US state of Maine and the southeastern border area of the Canadian province of New Brunswick, with various dams, powerhouses, and ship locks enclosing the Bay of Fundy and Passamaquoddy Bay (note: see map in reference). Nothing came of
1000-469: The UK, annual energy of 50 TWh can be extracted if 25 GW capacity is installed with pivotable blades. Tidal power can affect marine life. The turbines' rotating blades can accidentally kill swimming sea life. Projects such as the one in Strangford include a safety mechanism that turns off the turbine when marine animals approach. However, this feature causes a major loss in energy because of
1050-602: The UK. Based in Orkney, Scotland, the European Marine Energy Centre (EMEC) has supported the deployment of more wave and tidal energy devices than at any other single site in the world. EMEC provides a variety of test sites in real sea conditions. Its grid connected tidal test site is located at the Fall of Warness , off the island of Eday , in a narrow channel which concentrates the tide as it flows between
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#17327726482771100-577: The acoustic output from turbines, and changes in sedimentation processes. However, all these effects are localized and do not affect the entire estuary or bay. Saltwater causes corrosion in metal parts. It can be difficult to maintain tidal stream generators due to their size and depth in the water. The use of corrosion-resistant materials such as stainless steels, high-nickel alloys, copper-nickel alloys, nickel-copper alloys and titanium can greatly reduce, or eliminate corrosion damage. Mechanical fluids, such as lubricants, can leak out, which may be harmful to
1150-483: The amount of marine life that passes through the turbines. Some fish may avoid the area if threatened by a constantly rotating or noisy object. Marine life is a huge factor when siting tidal power energy generators , and precautions are taken to ensure that as few marine animals as possible are affected by it. In terms of global warming potential (i.e. carbon footprint), the impact of tidal power generation technologies ranges between 15 and 37 gCO 2 -eq/kWhe, with
1200-429: The death of fish that act as a vital food source to birds and mammals. Migrating fish may also be unable to access breeding streams, and may attempt to pass through the turbines. The same acoustic concerns apply to tidal barrages. Decreasing shipping accessibility can become a socio-economic issue, though locks can be added to allow slow passage. However, the barrage may improve the local economy by increasing land access as
1250-409: The difference in height (or hydraulic head ) between high and low tides. When using tidal barrages to generate power, the potential energy from a tide is seized through the strategic placement of specialized dams. When the sea level rises and the tide begins to come in, the temporary increase in tidal power is channeled into a large basin behind the dam, holding a large amount of potential energy. With
1300-604: The federal government refused to pay this, the PUD cancelled the project after spending nearly $ 10 million from reserves and grants. The PUD abandoned all tidal energy exploration after this project was cancelled and does not own or operate any tidal energy sources. In 1966, Électricité de France opened the Rance Tidal Power Station , located on the estuary of the Rance River in Brittany . It
1350-422: The location is artificial and does not contain a pre-existing ecosystem. The lagoons can also be in double (or triple) format without pumping or with pumping that will flatten out the power output. The pumping power could be provided by excess to grid demand renewable energy from for example wind turbines or solar photovoltaic arrays. Excess renewable energy rather than being curtailed could be used and stored for
1400-416: The marine life nearby. Proper maintenance can minimize the number of harmful chemicals that may enter the environment. The biological events that happen when placing any structure in an area of high tidal currents and high biological productivity in the ocean will ensure that the structure becomes an ideal substrate for the growth of marine organisms. Tidal energy has a high initial cost, which may be one of
1450-564: The potential for tidal barrages at Chignecto Bay and Minas Basin – at the end of the Fundy Bay estuary. There were three sites determined to be financially feasible: Shepody Bay (1550 MW), Cumberland Basin (1085 MW), and Cobequid Bay (3800 MW). These were never built despite their apparent feasibility in 1977. The Snohomish PUD , a public utility district located primarily in Snohomish County, Washington State, began
1500-472: The potential to generate significant tidal power using tidal stream turbines . Tides are more predictable than wave power or wind power . The Pentland Firth (a strait) may be capable of generating 10 GW . Cook Strait in New Zealand may be capable of generating 5.6 GW even though the total energy available in the flow is 15 GW. Straits used for international navigation through
1550-442: The reasons why it is not a popular source of renewable energy , although research has shown that the public is willing to pay for and support research and development of tidal energy devices. The methods of generating electricity from tidal energy are relatively new technology. Tidal energy is however still very early in the research process and it may be possible to reduce costs in future. The cost-effectiveness varies according to
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1600-479: The receding tide, this energy is then converted into mechanical energy as the water is released through large turbines that create electrical power through the use of generators. Barrages are essentially dams across the full width of a tidal estuary. A new tidal energy design option is to construct circular retaining walls embedded with turbines that can capture the potential energy of tides. The created reservoirs are similar to those of tidal barrages, except that
1650-763: The relatively shallow average depth of the strait, especially at its westernmost extremities, and the dangers that this presents, there have been recent calls for the body to be deepened, but there are no plans for this at the present time. Strait The terms channel , pass , or passage can be synonymous and used interchangeably with strait , although each is sometimes differentiated with varying senses. In Scotland, firth or Kyle are also sometimes used as synonyms for strait. Many straits are economically important. Straits can be important shipping routes and wars have been fought for control of them. Numerous artificial channels, called canals , have been constructed to connect two oceans or seas over land, such as
1700-423: The risk of organisms being pushed near or through these devices. As with all offshore renewable energies, there is also a concern about how the creation of electromagnetic fields and acoustic outputs may affect marine organisms. Because these devices are in the water, the acoustic output can be greater than those created with offshore wind energy . Depending on the frequency and amplitude of sound generated by
1750-672: The seafloor and coastlines . Tidal power is the only technology that draws on energy inherent in the orbital characteristics of the Earth–Moon system, and to a lesser extent in the Earth–Sun system. Other natural energies exploited by human technology originate directly or indirectly from the Sun, including fossil fuel , conventional hydroelectric , wind , biofuel , wave and solar energy . Nuclear energy makes use of Earth's mineral deposits of fissionable elements, while geothermal power utilizes
1800-501: The site of the tidal generators. One indication of cost-effectiveness is the Gibrat ratio, which is the length of the barrage in metres divided by the annual energy production in kilowatt hours . As tidal energy is reliable, it can reasonably be predicted how long it will take to pay off the high up-front cost of these generators. Due to the success of a greatly simplified design, the orthogonal turbine offers considerable cost savings. As
1850-774: The study, and it is unknown whether Canada had been approached about the study by the US Federal Power Commission. In 1956, utility Nova Scotia Light and Power of Halifax commissioned a pair of studies into commercial tidal power development feasibility on the Nova Scotia side of the Bay of Fundy. The two studies, by Stone & Webster of Boston and by Montreal Engineering Company of Montreal , independently concluded that millions of horsepower (i.e. gigawatts) could be harnessed from Fundy but that development costs would be commercially prohibitive. There
1900-713: The system, the effect is negligible and would not be noticeable in the foreseeable future. Tidal power can be classified into four generating methods: Tidal stream generators make use of the kinetic energy of moving water to power turbines, in a similar way to wind turbines that use the wind to power turbines. Some tidal generators can be built into the structures of existing bridges or are entirely submersed, thus avoiding concerns over aesthetics or visual impact. Land constrictions such as straits or inlets can create high velocities at specific sites, which can be captured using turbines. These turbines can be horizontal, vertical, open, or ducted. Tidal barrages use potential energy in
1950-423: The territorial sea between one part of the high seas or an exclusive economic zone and another part of the high seas or an exclusive economic zone are subject to the legal regime of transit passage ( Strait of Gibraltar , Dover Strait , Strait of Hormuz ). The regime of innocent passage applies in straits used for international navigation (1) that connect a part of high seas or an exclusive economic zone with
2000-644: The territorial sea of a coastal nation ( Straits of Tiran , Strait of Juan de Fuca , Strait of Baltiysk ) and (2) in straits formed by an island of a state bordering the strait and its mainland if there exists seaward of the island a route through the high seas or through an exclusive economic zone of similar convenience with respect to navigational and hydrographical characteristics ( Strait of Messina , Pentland Firth ). There may be no suspension of innocent passage through such straits. [REDACTED] Media related to Straits at Wikimedia Commons Tidal power#Tidal stream generator Tidal power or tidal energy
2050-412: The tidal device to severely affecting nearshore ecosystems and processes. Installing a barrage may change the shoreline within the bay or estuary , affecting a large ecosystem that depends on tidal flats . Inhibiting the flow of water in and out of the bay, there may also be less flushing of the bay or estuary, causing additional turbidity (suspended solids) and less saltwater, which may result in
Endeavour Strait - Misplaced Pages Continue
2100-466: The tidal energy devices, this acoustic output can have varying effects on marine mammals (particularly those who echolocate to communicate and navigate in the marine environment, such as dolphins and whales ). Tidal energy removal can also cause environmental concerns such as degrading far-field water quality and disrupting sediment processes. Depending on the size of the project, these effects can range from small traces of sediment building up near
2150-578: The time, it is likely they would have discovered eastern Australia approximately one hundred and fifty years before the British did, in 1770, as the Dutch had been successful in mapping most of the west coast of Australia during the early 17th century following Willem Janszoon 's sighting of the Cape York Peninsula in 1606. The shallow western end of Endeavour Strait was also responsible for
2200-561: The total availability of tidal power may be much higher than previously assumed and that economic and environmental costs may be brought down to competitive levels. Historically, tide mills have been used both in Europe and on the Atlantic coast of North America. Incoming water was contained in large storage ponds, and as the tide goes out, it turns waterwheels that use the mechanical power to mill grain. The earliest occurrences date from
2250-419: The world's oceans. This results in periodic changes in sea levels, varying as the Earth rotates. These changes are highly regular and predictable, due to the consistent pattern of the Earth's rotation and the Moon's orbit around the Earth. The magnitude and variations of this motion reflect the changing positions of the Moon and Sun relative to the Earth, the effects of Earth's rotation , and local geography of
2300-536: The wrecking of the cutter, America , in November 1844. All on board were supposedly drowned, except 13-year-old Scottish girl Barbara Thompson who was rescued by Torres Strait Islanders living on Prince of Wales Island, the Kaurareg people, with whom she lived for five years. Today, the strait is travelled sparsely by passing small vessels, and its western side is often used as a bank for these ships. Because of
2350-642: Was France's Rance Tidal Power Station , which became operational in 1966. It was the largest tidal power station in terms of output until Sihwa Lake Tidal Power Station opened in South Korea in August 2011. The Sihwa station uses sea wall defense barriers complete with 10 turbines generating 254 MW. Tidal energy is taken from the Earth's oceanic tides . Tidal forces result from periodic variations in gravitational attraction exerted by celestial bodies. These forces create corresponding motions or currents in
2400-597: Was also a report on the international commission in April 1961 entitled "Investigation of the International Passamaquoddy Tidal Power Project" produced by both the US and Canadian Federal Governments. According to benefit to costs ratios, the project was beneficial to the US but not to Canada. A study was commissioned by the Canadian & Nova Scotian and New Brunswick governments (Reassessment of Fundy Tidal Power) to determine
2450-430: Was increased to $ 20 million, half to be paid by the utility, half by the federal government. The utility was unable to control costs on this project, and by October 2014, the costs had ballooned to an estimated $ 38 million and were projected to continue to increase. The PUD proposed that the federal government provide an additional $ 10 million towards this increased cost, citing a gentlemen's agreement . When
2500-402: Was the world's first tidal power station. The plant was for 45 years the largest tidal power station in the world by installed capacity: Its 24 turbines reach peak output at 240 megawatts (MW) and average 57 MW, a capacity factor of approximately 24%. The world's first marine energy test facility was established in 2003 to start the development of the wave and tidal energy industry in
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