![]() ![]() The dam is 12.7 km (7.9 miles) long and uses ten 26 MW turbines positioned on the ocean floor. This system, which opened in 2011, is a 254 MW tidal barrage dam west of Seoul, South Korea. The world’s largest tidal power system, the Sihwa Lake Tidal Power Station, is located in South Korea. The cost for installing a tidal barrage dam is very high, and only a relatively few locations in the world have sufficiently high tides to make it economically viable. A conceptual plan for a tidal barrage system is shown in Figure 2.įigure 2 Plan View of a Tidal Barrage Systemīecause the barrage dam stretches completely across the harbor or river, it must have a lock to accommodate shipping or boating. The barrage continues to fill and empty twice daily as the high tide comes in and then changes to a low tide. When the difference is large enough, the flow valves are opened so that the water flows under the dam through the tubes and past a generator turbine, causing it to turn and produce power. When the tide drops, it creates a difference between the water behind the dam and the water in front of the dam that is at the level of the low tide. When the tide reaches its highest level, the gates close, capturing the maximum amount of water behind the dam. When the water is flowing into the area behind the dam as the tide is rising, it causes the turbine to rotate and produce electricity. When the tide rises, sluice gates open to allow the tide to flow through tunnels and fill the area behind the dam. The tidal barrage dam is a large dam that stretches completely across an estuary, harbor, or river that connects to part of the ocean that has a tide. Tidal Barrage System WorkingĪ tidal barrage system is designed to convert tidal power into electricity by trapping water behind a dam, called a tidal barrage dam, and generating power from the inflow and/or release of water. ![]() The currents associated with the tides depend on the particular location on earth currents from tides can vary from 0 to over 2 m/s. At first and third quarter, the net gravitational force of the sun and moon is not as pronounced, so lesser tides than normal, called neap tides, are produced (neap tides also occur twice each month). When the sun, moon, and earth all align, a stronger gravitational pull occurs on the oceans, and higher and lower tides called spring tides are produced.Ī spring tide has nothing to do with the spring season of the year rather, it occurs at new moon and again at full moon (approximately twice a month). ![]() Because of varying ocean depths, landmasses, and other factors at different locations on earth, the actual tides vary. The actual time between high tides is approximately 12 hours and 25 minutes, which is the time required for the alignment to occur again. The bulge on the side toward the moon is responsible for one tide, but the effect of centrifugal force is responsible for the bulge on the opposite side. This pivot point for rotation is the offset that causes the earth to experience a force that pushes water away from the center of mass on the opposite side, much like what happens if you swing a bucket of water in a circle. The earth-moon system actually rotates about a common center of mass that is located inside the earth and in the direction of the moon. A second bulge can be found on the opposite side of the earth due to the earth’s orbital motion. When the bulge reaches the coast, a high tide occurs. ![]() The bulge in the ocean is known as a high tide. The gravitational pull of the moon causes the ocean to bulge in the part closest to the moon. Various methods of harnessing tidal energy are discussed in this section. The change in water level between a high tide and low tide can be harnessed to produce electrical power, or the current can be used to turn turbines. ![]()
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