北本水电站下引航道泥沙冲淤数值模拟

针对北本水电站下引航道泥沙淤积问题,采用平面二维泥沙数学模型进行了数值模拟,得到了下引航道特别是口门区5年淤积过程。在此基础上,讨论了航道冲沙闸冲沙流量和冲沙时机,提出了改善航道冲沙闸冲沙效果的措施。建议冲沙时机选择在流量较小的时候, 为减少电能损失,下引航道拉沙可以选择在深夜负荷处在低谷的时候进行。

Numerical Simulation of Sediment Erosion and Deposition in the Lower Approach Channel on Pak Beng Hydropower Station

According to the problem of sediment deposition in the lower approach channel of Pak Beng hydropower station, numerical simulation was conducted by use of plane two-dimensional sediment mathematical model, and the 5-year deposition process of lower approach channel especially the entrance area was obtained. On this basis, flushing flow rate and flushing time of the channel scouring sluice were discussed, and measures to improve the flushing effect of channel scouring sluice were proposed. It’s suggested that flushing time be chosen when the discharge is small, and the sand scouring in the lower approach could be conducted at mid-night, when load is at a low ebb in order to reduce the loss of the electric energy.