城市暴雨积涝数值模拟技术方法

洪涝灾害是中国最常见、影响最严重的自然灾害之一。在当前城市内涝模拟研究中,通常是对降雨过程中积涝最严重状态进行模拟,缺乏面向整个降雨过程的积涝动态过程模拟技术方法。本研究综合运用SWMM模型和GIS技术,通过对研究区的汇水区划分和排水管网概化建模,建立了研究区的SWMM模型,基于SWMM模型对降雨过程中汇水区积水量进行计算,利用地表积水有源扩散算法进行地表积水演进行计算,实现降雨过程中地表积水空间分布和积水风险深度模拟计算。以研究区2016年6月18日的降水过程进行积涝模拟及模拟误差分析,结果表明该技术方法具有良好的模拟效果。

A Numerical Simulation Technique of Urban Rainstorm Waterlogging

Flooding is one of the most common and serious natural disasters in China. Presently we usually simulate the most severe waterlogging during the rainfall process and lack the simulation technique for the whole rainfall process in the urban waterlogging simulation study. In this study, comprehensively using the SWMM model and GIS technology, by dividing the water catchment areas of the research area and modeling of the generalized drainage network, the SWMM model for the study area is established, and at the same time calculating the amount of water collected in the precipitation process based on the SWMM model, calculating the evolution of surface water by using the active diffusion algorithm. The simulation and simulation error analysis of the precipitation process in the research area on 18 June 2016 show that the method has good simulation effect.