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一、概况渔子溪二级水电站为一高水头引水式电站,设计水头257.5米,最大净水头301.8米,安装4台HL-100-LJ210型水轮机,水流相对于水轮机叶片的速度大于30米/秒。减少高速挟沙水流对水轮机磨损是本电站首部枢纽布置设计的一项主要任务。首部枢纽闸址距河口约21公里,河道平均纵坡25.4‰,两岸山势陡峻,岸坡约40～70度河谷多属“V”型狭谷。由于风化剥蚀作用强烈、崩坡积物广布,暴雨洪水时,被水流挟带入河道,形成固体径流。据渔子溪水文站实测统计,多年平均悬移质输沙量120万吨,最大年输沙量(1964年)462万吨,多年平均含沙量0.60公斤/立方米,最大日平均含沙量54公斤/立方米。据调查
I. Overview Yuzixi Hydropower Station II is a high-head diversion power station with a head of 257.5 meters and a maximum of 301.8 meters of clean water head. Four HL-100-LJ210 turbines are installed, and the flow rate of the water relative to the turbine blades is more than 30 meters /second. Reducing the high-speed sediment-laden flow to the turbine is one of the main tasks of the layout design of the first hub of this power station. The first hub gateway address about 21 kilometers away from the estuary, the average longitudinal slope 25.4 ‰, both sides of the steep mountains, about 40 to 70 degrees of bank slope are mostly “V” type of valley. Due to the strong weathering and denudation effect, the landslide deposits are widely distributed. When storm floods occur, they are entrained in rivers by water streams to form solid runoff. According to the statistics of Yuzixi Hydrological Station, the annual average suspended sediment transport volume is 1.2 million tons, the maximum annual sediment discharge (1964) is 4.62 million tons, the annual average sediment concentration is 0.60 kg / m 3, and the maximum average daily sediment concentration Amount of 54 kg / cubic meter. According to the survey