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利用河工模型对某抽水蓄能电站下库区进行了特征洪水过程及电站运行的联合模拟试验。试验表明在输沙槽与拦沙潜堰共同作用下,电站进出水口的含沙量得到有效控制。在来水含沙量低于3kg/m3时,进出水口含沙量都满足电站运行要求,但是在含沙量较高的洪水期,底部浑水会逆行至电站进出水口附近,导致过机含沙量较高,因此提出了增设非封闭式拦沙潜坝的修改方案。修改方案改善了进出水口前的水流结构,起到了良好的拦沙截淤作用,进出水口前含沙量及泥沙淤积大幅减少,蓄能期过机含沙量降低13%~22%。在含沙量较大的洪水期,电站不宜抽水运用,但适时采用发电运行有助于减轻下库进出水口前的泥沙淤积。
The river model was used to simulate the characteristic flood process and power station operation in the reservoir area of a pumped storage power station. Experiments show that under the joint action of sediment transport sand tank and sand-blocking weir, the sediment concentration at the inlet and outlet of the power station is effectively controlled. When the sediment concentration in sediment is less than 3kg / m3, the sediment concentration in both inlet and outlet will meet the requirements of power station operation. However, in the period of flood with high sediment concentration, the muddy water at the bottom will retrograde to the vicinity of the inlet and outlet of the power station, Therefore, a proposal of adding a new non-enclosed block barrage is proposed. The modified scheme improved the water flow structure in front of the water inlet and outlet and played a good role in silting and sand blocking. The sediment concentration and sediment deposition before and after the water inlet and outlet were greatly reduced, and the sediment concentration during the storage period was reduced by 13% -22%. During flood periods with large sediment concentration, power plants should not be pumping water. However, timely power generation operation can help to reduce the sedimentation before entering and leaving the lower reservoir.