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朗斯河在法国的西北海岸,其纬度约与巴黎相同。从1943年开始,法国即开始进行利用朗斯河口潮汐能发电的研究,直到1951年初才由法兰西电力公司潮汐能发电研究所提出了一个朗斯河潮汐能发电的初步设计。这个初步设计经多次修改之后,确定:拦河坝长730公尺,坝顶高出最低潮位15公尺,装机容量36万瓩,水轮发电机组40台,每台容量为9千瓩。年发电量约为8～9亿度。
The River Lens is on the northwestern coast of France and has the same latitude as Paris. Since 1943, France has begun research on the use of tidal energy at the estuary of the Lens. It was not until 1951 that a preliminary design for the tidal power generation of the Lens River was proposed by the French Institute of Tidal Power Research. This preliminary design, after several modifications, determined that the barrage is 730 meters long, the crest height is 15 meters higher than the lowest tide, the installed capacity is 360,000 tons, and 40 hydroelectric generating units each have a capacity of 9 thousand pounds. The annual power generation is about 800-900 million degrees.