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南水北调中线工程总干渠与洪河交叉的倒虹吸工程,对天然河道洪水演进及河床变形产生了影响.采用平面二维水沙数学模型,依据历史洪水调查资料对模型进行调试和验证,按未修建洪河倒虹吸的自然工况及修建洪河倒虹吸的设计工况两种边界条件对工程交叉河段进行了典型洪水的水沙数值模拟,模拟计算给出了工程附近洪水水位、流速及冲刷深度等水力要素特征值.计算结果分析表明:倒虹吸工程位置选择合适,底宽布置及埋置深度基本合理.
The inverted siphon project, which crosses the main channel of the South-to-North Water Diversion Project and Honghe River, has an impact on the flood evolution and river bed deformation of the natural channel. The plane 2D mathematical model of water and sediment is used to debug and validate the model according to historical flood investigation data, The natural conditions of Honghe inverted siphon and the design conditions for constructing Honghe inverted siphon Two kinds of boundary conditions are used to simulate the water and sediment of the typical flood in the intersecting river sections of the project. The simulation results show that the flood water level, velocity and scour Depth and other hydraulic features.The calculation results show that: the inverted siphon engineering location selection, bottom width layout and embedding depth is reasonable.