![]() ![]() ![]() The objectives were to make a preliminary assessment of the relative frequency with which dead fish accumulate in the Rance barrage lock pit to assess the likely cause of mortality and to assess the success with which marine fish migrate across a tidal barrage by tagging a variety of species within the barrage basin. This report describes the results of three weeks field work carried out on the Rance Estuary in August 1991. (author)Īn assessment of fish mortality at the Rance tidal power barrage, Brittany, France Methods of assessing the likely cost of electricity from any site are set out and applied to possible sites around the world. These are discussed together with the economics of tidal power. Although a tidal power barrage would be non-polluting, the resulting changes in the tidal regime would have important environmental effects. The principal features of a barrage and possible methods of operation are described in detail. This book describes how large tides develop in particular places and how the energy could be extracted by building suitable barrages. International Nuclear Information System (INIS) The weight of steel required, in relation to the annual average power generated, compares very favourably with a recent offshore wind farm. 35 TWh yr -1 ), maintain the existing tidal ranges upstream of it and reduce the tidal ranges downstream of it by only about 10%. For the case of the Severn Estuary, UK, it is shown that a barrage at Porlock would generate an annual average power of 4 GW (i.e. It also does not require tapered entry and exit ducts, making the barrage much smaller and lighter, so that it can conveniently be built in steel. It is better suited to combined operations with pumping that maintain the tidal range upstream of the barrage (important in reducing the environmental impact), and is much less harmful to fish. Lightweight steel tidal power barrages with minimal environmental impact: application to the Severn Barrage.įor tidal power barrages, a breast-shot water wheel, with a hydraulic transmission, has significant advantages over a conventional Kaplan turbine. 35 TWh yr-1), maintain the existing tidal ranges upstream of it and reduce the tidal ranges downstream of it by only about 10%. Lightweight steel tidal power barrages with minimal environmental impact: application to the Severn Barrageįor tidal power barrages, a breast-shot water wheel, with a hydraulic transmission, has significant advantages over a conventional Kaplan turbine. ![]()
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