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A tidal barrage is a dam-like structure used to capture the energy from masses of water moving in and out of a bay or river due to tidal forces. [1] [2] Instead of damming water on one side like a conventional dam, a tidal barrage allows water to flow into a bay or river during high tide, and releases the water during low tide.
The Nampho Dam or West Sea Dam, also known as the West Sea Barrage or West Sea Lock Gate, is a tidal barrage located 15 km west of the special city of Nampho, North Korea. It is a large, eight-km-long system of dams, three lock chambers, and 36 sluices , allowing the passage of ships up to 50,000 tons.
The common primary functions of a barrage are: Increase the depth of a river (similar to a weir) Maintain a separation between fresh and salt water; Reduce the risk of tidal flooding up the river; Secondary functions may include: Tidal power generation; Artificial whitewater leisure centres; Form a Coastal reservoir
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.
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, [ 2 ] meaning it has the potential to generate ...
Tidal stream, harnessing kinetic energy of the tidal streams and currents flowing around the coastline using free-stream turbines. There could be up to 20 GW of tidal range resource in the UK, able to generate 30 TWh/year or around 12% of the UK's electricity demand.
Diagram of a plan to harness tidal power on the River Severn circa 1921. Caption from Popular Mechanics Magazine 1921 Barrage locations considered over the years. A huge tidal range and high level of surrounding industry and population have long made the Severn Estuary and Bristol Channel a focus for tidal energy schemes and ideas.
Unlike historical tide mills, which could operate only on an ebb tide, the Rance barrage can generate electricity on both flows of the tide, or it can be used for pumped storage, depending on demand. A less intrusive design is a 1MW free-standing turbine, constructed in 2007 at Strangford Lough Narrows; this site is close to an historic tide mill.