为了模拟溃堤洪水的演进过程，建立计算区域的二维水动力模型，采用基于非结构网格的Roe格式离散求解。针对保护区内存在线状地物等实际特点，将道路、灌渠渠堤等建筑物线性处理，概化为宽顶堰的形式计算，赋予实际高程，将其作为特殊边界与非结构网格耦联；采用自然邻点插值计算方法，将保护区与排水沟分区插值，还原区域内排水沟地形，通过以上方法，获得了具有真实地形的模型。将模型应用于青铜峡河西灌区四排口险工溃堤洪水模拟，有效模拟了道路、渠堤等特殊边界阻水和桥涵过水效果，以及排水沟内排水和入河口洪水倒灌过程，较为真实地反映了洪水在计算区域内的演进过程和淹没范围，具有较好的应用价值。

In order to simulate the flood wave propagation through the breaches，a two-dimensional hydrodynamic model was developed. Roe method of unstructured mesh was used to solve the 2D model. Based on the actual characteristics such as linear features in the flood protected zone，ways and irrigation ditches were generalized to broad crested weir for calculation and endowed real height，considering it as special border and coupled unstructured mesh. Using the Natural Neighbor Interpolation， separated interpolation was conducted between protected zone and aqueduct，and terrain of aqueduct in the area was recovered，and model with real terrain was obtained through the above methods. The model was applied to the case of Qingtongxia West Irrigation of Yellow River on Sipaikou，effectively simulated water blocking of special border such as ways and irrigation ditches and water flow of bridge culverts，and the effect of drain in the aqueduct and intrusion in the estuary，and truly simulated the flood wave propagation and inundation area of flood in calculation area，thus the paper has bright application value.

：高等学校学科创新引智计划资助（B14012）