多泥沙流域水电站冲沙孔的设计和计算

Design and calculation of flushing outlet for a hydropower station on sediment-laden river

多泥沙流域建水电站,若没有做好排沙措施,不仅会导致有效库容减少,增加防洪压力,库尾淤积上延还会导致河道两岸被淹没,影响到水电站的使用寿命,而且泥沙淤积会导致大坝本身防渗性能大大下降,影响大坝结构安全。因此排沙是水电站设计中一项很重要的部分。本文介绍了尼泊尔中西部Jajarkot地区Bheri河中上游一水电站排沙的设计和运行方式。

If sand flushing facility is not properly designed for a hydropower station on sediment-laden river,the effective storage capacity of reservoir will decrease;the flood control pressure will increase;the siltation at the reservoir tail will lead to the inundation on both banks;the service life of hydropower station will be influenced;sediment deposition will greatly reduce the anti-seepage performance of the dam itself and affect the safety of the dam structure.Therefore,sediment discharge design of hydropower station is very important.An introduction was made on the design and operation mode of the sediment discharge structures of a hydropower station located on the middle and upper reaches of the Bheri River in Jajarkot district in central and western Nepal.