7/1/2023 0 Comments Tidal power station![]() View of dike before construction (December 2004). ![]() New roads were then built over the sluice gates, after which the diversion roads and cofferdam were removed, and the turbines were tested (Figure 1).ġ. ![]() After a gantry crane was erected as a temporary wharf, the turbines were transported by a special carrier and installed. Then, the temporary basin that the cofferdam created was drained and excavated for dry work, and the main concrete structures for the turbines and sluices were built. After silt protection was ensured, a temporary circular cell cofferdam was installed and diversion roads were built. But at low tide, the gates are raised and the turbines revert to sluicing mode, allowing the lake to be emptied and no electricity to be produced.Īccording to Daewoo Engineering & Construction Co., the international firm that won the engineering, construction, and procurement contract, construction of the project entailed about a dozen key stages. As the tide rises, saltwater flows through the turbines from the Yellow Sea and into Lake Sihwa, creating electricity. The tidal units essentially produce power by exploiting the gap in the water level between the sea and Lake Sihwa. One half of the bridge is taken up by the 10 generating units, and the other half, by eight culvert-type sluice gates, seen in the foreground of the opening photo. Today, the plant is housed in the concrete seawall that bridges two “eco-park” areas. Seven years after that, in December 2011, K-water’s Sihwa Lake tidal power plant was connected to the grid, equipped with 10 bulb-type generator units (each 25.4 MW) that produce about 552.7 GWh annually. (then KOWACO, and recently renamed K-water) to step in and propose a tidal power barrage that uses a single-effect flood generation method and allows up to 60 billion tons of seawater to be circulated annually.īy December 2002, the project was approved, and precisely two years later, in 2004, construction began. ![]() That move prompted South Korean governmental water authority Korea Water Resources Corp. By 1997, partly driven by a pollution scandal that dubbed Sihwa “The Lake of Death,” officials were forced to reformulate their plans, opening a sluice to allow seawater to regularly flush the basin. The pollution severely contaminated the basin and made it unusable as a freshwater reservoir, as intended. In 1994, South Korea created the 56.5-square-kilometer (km2) freshwater Lake Sihwa by constructing a 12.7-km dike between Oido Island in Siheung city and Daebudo Island in Ansan city to secure agricultural and irrigation water, and to reclaim 173 km2 of land near the local metropolitan areas of three cities surrounding the lake.īut within years after the embankment was built, it was apparent that without seawater circulation, Lake Sihwa-which is about the size of Manhattan Island-was seeing an inordinate inflow of polluted wastewater from a nearby industrial complex. ![]()
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