摘要
果多水电站具有河道多泥沙的特点，根据水库运行要求，冲沙流量在500m^3／s以上，为节约工程投资，冲沙中孔兼作泄洪孔。由于冲沙中孔左侧紧邻引水发电系统，右侧紧邻溢流表孔布置，泄洪冲沙下泄水流对厂房和消力池影响较大，经过比较，泄水冲沙方案采用中孔延长，舌型鼻坎的体型，使下泄水流远离厂房，大大减小了对厂房运行及尾水出流的影响，改善了淤沙集中于消力池可能导致排水失效及对消力池底板磨损的缺点，增加了工程运行的安全可靠性。
There is much silt in the river where Guoduo hydropower project is located. Based on the requirement of reservoir operation, the silt orifice is also used for flood discharging to save the project investment when silt discharge is above 500m^3/s. The silt orifice is adjacent to the diversion power system on the left and to the overflow orifice on the right, so the water flow of flood discharging and silt releasing will produce an effect on the powerhouse and stilling pool. By comparing, the prolonged silt orifice and tongue - type bucket can make discharging flow far away from the powerhouse and largely reduce the effect on the powerhouse operation and tailwater discharge. The discharge failure resulted by inflowing sediment in the stilling pool and silting pool base plate abrasion can be improved and the safe responsibility of the project operation can be increases.
