【摘要】 通过考虑社区和楼房内部的容水性,引入侵入水量的概念,建立了能够模拟建筑物密集城区溃堤水流运动的数学模型。该模型采用有限体积法对浅水方程进行非结构离散,通过Roe格式计算界面数值通量,给出了侵入水量的合理估算方法。通过物理模型的试验结果验证了本文模型的准确性和稳定性。最后应用该模型对哈尔滨市可能发生的溃堤洪水进行模拟,计算结果表明,该模型能较好地模拟溃堤洪水在城区内的运动过程,侵入系数的变化对计算结果有比较明显的影响。更多还原

【Abstract】 A numerical model is developed to simulate the levee breach flood in dense urban areas.The 2D shallow water equations are spatially discretized by the unstructured finite-volume method,and Roe’s scheme is used to compute inter-cell fluxes.The invasion coefficient is suggested because the flash flood will invade into the residence block and buildings.A reasonable method is used to compute the invasion water flow.The accuracy and stability of the proposed model are verified by physical model test.The model is applied to simulate the possible flooding events due to levee breach in the Harbin City.The result shows that the model can accurately simulate flood propagation in urban areas with dense buildings.The invasion coefficient has an obvious influence on calculation results.更多还原