Ebb Generation: – The tidal power is generated as the water leaves a tidal reservoir on the Ebb flow tide.Flood Generation: – The tidal power is generated as the water enters a tidal reservoir on the incoming Flood tide.
The three main tidal energy barrage schemes that use this water differential to their advantage are: The tidal energy extracted from these tides is potential energy as the tide moves in a vertical up-down direction between a low and a high tide and back to a low creating a height or head differential.Ī tidal barrage generation scheme exploits this head differential to generate electricity by creating a difference in the water levels either side of a dam and then passing this water difference through the turbines. The tidal range is the vertical difference between the high tide sea level and the low tide sea level. This increase in the sea level can create a tidal range of over ten metres in height in some estuaries and locations which can be exploited to generate electricity. The result of funnelling all of this water is that the height of the sea level once inside these inlets can increase vertically many metres every day as it is being pushed forward by the incoming sea water behind it as shown in the image. The effect of this sloping gradient is to funnelling the water into the estuaries, lagoons, river inlets and other such tidal “bottlenecks” along the coastline. However, as the oceans water moves nearer towards the coastline, the sea level rises steeply especially around inlets and estuaries because of the upward sloping gradient of the sea bed. In the open ocean, this rise is very small as there is a large surface area with deeper depths for it to flow into.
The result of this movement of water is a rise in the sea level. The gravitational effects of the sun or the moon on the worlds oceans causes huge amounts of sea water to be directed towards the nearest coastline.
TIDAL BARRAGE GENERATOR
As a tide is the vertical movement of water, the tidal barrage generator exploits this natural rise and fall of tidal waters caused by the gravitational pull of the sun and the moon. On outgoing ebbing tides, the sea water flows in the opposite direct emptying it. On incoming high tides, the water flows in one direction and fills up the tidal reservoir with sea water. Tidal barrage generation using the tides is very similar to hydroelectric generation, except the water flows in two directions rather than just one. The water which flows into and out of these underwater tunnels carries enormous amounts of kinetic energy and the job of the tidal barrage is to extract as much of this energy as possible which it uses to produce electricity. Fixed within these tunnels are huge tidal turbine generators that spin as the sea water rushes past them either to fill or empty the tidal reservoir thereby generating electricity. The barrage has a number of underwater tunnels cut into its width allowing the sea water to flow through them in a controlled way by using “sluice gates” on their entrance and exit points. The bottom of this barrage dam is located on the sea floor with the top of the tidal barrage being just above the highest level that the water can get too at the highest annual tide. The Tidal Barrage or Tidal Power Plant as it is also known, is a form of “marine renewable energy” generation system that uses long walls, dams, sluice gates or tidal locks to capture and store the potential energy of the ocean.Ī Tidal Barrage is a type of tidal power generation scheme that involves the construction of a fairly low walled dam, known as a “tidal barrage” and hence its name, spanning across the entrance of a tidal inlet, basin or estuary creating a single enclosed tidal reservoir, similar in many respects to a hydroelectric impoundment reservoir. Tidal Barrage Generation Tidal Barrages – turning the tide on power generation
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