冲积河流引水枢纽结构变化对上下游河床冲淤的影响

Influence of Structure Changes of Water Diversion Project upon Scouring and Silting in Upstream and Downstream River Bed

引水枢纽工程的修建必然改变原河段的河势及形态,塔里木河乌斯满枢纽工程在修建前通过模型试验,对引水枢纽结构改变前后的水面线、流态、流速、枢纽上下游冲淤地形、泥沙出库率、闸后冲深进行研究,表明枢纽结构改变后,对河道水边线的影响较小,而加大了河道主槽水流流速,增强了水流挟沙能力,增大了泥沙出库率,减小枢纽上游泥沙淤积,加大了闸后冲刷深度。

The regime and form of original fiver section would be certainly changed for a water diversion project to be built. Based on this, through the model tests of Tarim River＇ s Wusiman Hydro Project, such the aspects as water edge, flow field, flow velocity, scouring and siking topography, sediment-outbound rate, scouting depth behind gate and so on are tested and studied. The results show that the changes of the hydro project＇ s structure would have less effect on the fiver water boundaries, while increase the main channel flow velocity, improve the silt-laden capacity of the flow, increase the sediment-outbound rate, reduce the upstream sediment deposition and increase the scouting depth behind the gate.