城市地面洪水演进模拟方法的数值实验对比研究

Numerical Experiment Comparative Research on Simulation Methods for Flood Propagation in Urbanization Ground

为了探索城市洪水模拟中各种城市建筑物处理方法效果及可行性,归纳了边界法、设定高程法、人工加糙法以及容积率方程法4种方法。最后,构建了一个模拟城市建筑群算例,采用4种方法进行计算并对比结果分析。研究表明,边界法模拟效果最好,但前期数据处理复杂,并且计算耗时长;容积率系数法前期数据处理简单,计算耗时短,并且模拟效果能满足大尺度城市洪水演进模拟要求。

To investigate the effect and feasibility of different treatment method in urban flood inundation simulation,four methods of solid wall for building representation,two dimensions topography building representation,local friction based representation of building,and two dimensions shallow water equations with plot ratio were summarized.Then,a simulated urban complex construction example was established.Finally,the results of the four methods were comparied.The results indicated that the effect of solid wall for building representation method is best,but it requires complicated data processing and high computational cost.The reasonable effect could be obtained by the method of two dimensions shallow water equations with plot ratio with simple data processing and low computational cost.