断波在朱沱—三峡坝址库区河段传播规律分析

水库群建成运行改变了河道天然洪水传播特性,主要表现在洪水传播时间明显变化。通过建立朱沱—三峡坝址库区河段水动力学模型,模拟分析了不同坝前水位、不同断波流量,以及不同最大流量持续时间条件下的洪水波传播特性,揭示了各因素对断波在该河段传播的影响规律。研究表明:影响断波在河道中传播过程的因素较为复杂,断波流量、最大流量持续时间和坝前水位均会对其传播造成一定程度影响,其中最大流量持续时间对洪水传播时间的影响最小,断波流量其次,坝前水位的影响最大。研究成果可为三峡入库洪水精确预报和三峡水库优化调度提供一定的技术支撑。

Propagation of Surge Wave in Three Gorges Reservoir Area Reach from Zhutuo to Dam Site

The construction and operation of reservoir groups have changed the natural flood propagation characteristics, which are mainly reflected on the change of flood propagation time. By establishing hydrodynamical model of the reach from Zhutuo to the dam site of Three Gorges Reservoir, we simulated and analyzed the flood wave propagation characteristics under the conditions of different reservoir water levels, different surge wave flows and different maximum flow durations, hence revealing the influences of such various factors on the surge wave propagation in the reach. Results suggest that the factors affecting the propagation of surge wave in the river channel are complex. Surge wave flow, maximum flow duration and reservoir water level all exert influence on the propagation, among which the maximum flow duration has the smallest influence on the propagation time of the flood, followed by surge wave flow and reservoir water level. The research findings offer technical support for the precise forecast of incoming flood and the optimized scheduling of Three Gorges Reservoir.