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采用一维浅水动力学模型进行梯级大坝溃决洪水的模拟.首先通过水槽实验对模型进行检验,然后将其应用于系列梯级大坝溃决洪水工况的数值模拟.系统考虑了坝高和坝间距对梯级大坝溃决洪水的影响.计算结果表明梯级大坝溃决洪水与单个坝溃决洪水相比,峰值水位显著增加或到达下游断面时间显著提前或两者都有,即显示梯级大坝溃决洪水渐进增强机制.坝高和坝间距会改变溃坝洪水的流量(水位)峰值或传播时间,但不会改变梯级大坝溃决洪水渐进增强机制.研究结果为流域防洪管理和梯级大坝防洪设计提供了理论依据.
A one-dimensional shallow hydrodynamic model was used to simulate the flood of cascade dam. First, the model was tested by a sink test and then applied to the numerical simulation of the series of cascade dam collapse floods.The dam height and dam spacing The impact on the collapse of the cascade dam is calculated.The results show that the collapse of the cascade dam compares with the failure of a single dam, the peak water level increases significantly or reaches the downstream section significantly ahead of time, or both, indicating that the cascade dam is going to flood gradually The dam height and dam spacing will change the peak value or propagation time of the dam failure flood but will not change the progressively increasing mechanism of the step dam collapse.The research results provide the suggestions for the flood control of the basin and the flood control design of the cascade dam Theoretical basis.