水电站近坝区水沙输移二维数值模拟

Two-dimensional Numerical Simulation of Water and Sediment Transport in the Near Dam Area of Hydropower Station

以萨拉康水利工程为例,采用平面二维水沙模型对近坝区域的水沙运动进行计算研究,分析了敞泄排沙条件下上引航道、泄洪闸、厂房等区域的泥沙淤积分布。结果表明,萨拉康水利枢纽工程运行30年后,泄洪闸前的泥沙淤积不会影响闸门安全运行;上引航道口门区主要受主流回流的影响,产生回流淤积;厂房段的拦沙坎与冲沙底孔可有效保护厂房进水口。

Taking the Sanakham Hydropower Station as an example,the plane 2D water and sediment model was used to calculate the water and sediment movement near the dam area.And then the sedimentation distribution of the upper approach channel,flood gate,powerhouse and other areas were analyzed under the condition of open discharge.The results show that after 30 years of operation of this project,sedimentation before the flood gate will not affect the safe operation of the gate.the entrance area of the upper approach channel is mainly affected by the mainstream backflow,resulting in backflow siltation;The debris barrier and sand duct in the powerhouse section can effectively protect the water inlet of the plant.