三峡水库动库容研究及防洪能力分析

Study on Dynamic Reservoir Capacity and Flood Control Capacity of Three Gorge Reservoir

针对三峡水库为长江中下游防洪体系的重要组成部分,基于动库容调洪的基本原理,编制了瞬时水面线法、普来士曼隐式差分法和三级河网算法三种不同的动库容调洪计算模型,采用三峡水库建成后的实测洪水对模型进行了验证;并以此为基础,考虑了泥沙淤积对三峡水库防洪能力的影响。结果表明,三峡水库建成后能发挥应有的防洪作用,亦能实现设计拟定的防洪目标。

Three Gorge Reservoir is an important part of flood control system for middle and lower reaches of the Yangtze River. Base on the principle of dynamic reservoir capacity flood routing, three kinds of flood routing model are established, which are instantaneous water surface profile algorithm, preismann implicit difference algorithm and three stage river network algorithm. These models are verified by using record flood occurring after Three Gorge Reservoir constructed. Based on these models, the flood control capacity of Three Gorge Reservoir is studied with considering the effect of sediment deposition. The results indicate that Three Gorge Reservoir after construction can play the due role of flood control, and its design target of flood control can be realized.