乐滩水电站整体水工模型航道冲沙试验研究

Waterway Flushing Test on Overall Hydraulic Model for Letan Hydropower Station

布置有通航设施的水电站建坝后,通航建筑物的特殊布置位置及水力条件影响,引航道内发生泥沙淤积是较为普遍的现象,在枢纽布置设计及工程建设中是需要考虑及解决的问题之一。针对乐滩水电站船闸布置特点,通过水工物理模型试验进行研究,验证及分析了上下游引航道拉沙冲沙效果,经不同流量级及工况试验,对原方案反复试验验证和修改后,提出了较佳的排沙效果方案,并被工程设计采纳。

After the dam of a hydropower station with navigation facilities is constructed, sediment deposition is often found in approach channel due to special location of navigation structures and the impact of hydraulic conditions. Such problem shall be solved in design and construction of the station. Based on features of ship lock arrangement at Letan Hydropower Station and the results of hydraulic physical model test, sand transporting and flushing effect at upstream and downstream approach channels are studied. Tests under different flow rates and operating conditions are done. Through repetitive experimental verification and revision of original design, a better sediment flushing scheme is proposed and adopted by the station.