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针对分蓄洪区内存在井字形河渠的特殊地形情况,考虑水流在河渠内外区域里运动特点的不同,在现有的分蓄洪区平面二维水流数学模型的基础上,对模型进行扩展,建立了适合模拟含有井字形河渠的分蓄洪区洪水演进的新平面二维水流数学模型.运用模型对概化地形区域进行计算,计算结果表明,井字形河渠内水流流速较快,河渠内水流充满后越过堤防进入相邻区域,水流运动比较符合规律,证明了该模型在理论上和方法上都是可行的.该方法可用于模拟分蓄洪区内含有井字形河渠对洪水演进的影响,为防洪调度提供参考.
In view of the special topographic features of the well-shaped channel in the flood diversion area, considering the different characteristics of the water flow in the inner and outer channels of the channel, the model is extended on the basis of the existing planar two-dimensional flow mathematical model in the flood diversion area, Which is suitable for simulating the two-dimensional flow mathematical model of flood in flood diversion area containing well-shaped channel. Using the model to calculate the generalized terrain area, the calculation results show that the flow velocity in the well-shaped channel is fast, The embankment enters into the adjacent area and the water movement is more in line with the law, which proves that the model is feasible in both theory and method. This method can be used to simulate the influence of the well-shaped channel in the flood diversion area on flood evolution and provide flood control schedule reference.