基于MIKE URBAN模型研究设计暴雨雨型对城市内涝的影响

The Effect of Design Storm Patterns on Urban Waterlogging Based on MIKE URBAN Model

以成都市中心城区某内涝频发区为研究区域,应用MIKE URBAN模型研究设计暴雨雨型对城市内涝的影响。通过模拟不同重现期和雨型的设计暴雨条件下城市排水管网的节点溢流情况,并对溢流总量、易涝雨水井溢流时间变化情况和管网溢流空间分布变化情况进行对比分析。结果表明:重现期大于20年,设计暴雨雨峰系数越小,排水管网溢流总量越大;设计暴雨雨峰系数越小,易涝雨水井处溢流程度越严重,其影响程度随重现期增大而减小;设计暴雨雨峰系数越大,管网溢流点数量越多,相应的内涝灾害等级越高,内涝积水影响的空间范围越大。本文在揭示暴雨雨型与城市排水管网溢流规律的同时,验证了四川省水文手册中成都市中心城区设计暴雨雨型的合理性,对城市排水防涝工作具有一定指导意义。

In order to analyze the influence of design storm pattern on urban waterlogging,MIKE URBAN model is used to simulate the node flood of urban drainage pipe network of a waterlogged zone in the central city of Chengdu.Design hyetographs with different patterns and return period are considered.The total overflow,the node flood time series of a waterlogged well and the spatial distribution of waterlogging are analyzed.By comparing the simulation results,it is found that the lower storm peak position coefficient may cause a larger total overflow when the return period is greater than 20 years,and also more serious waterlogging degree of a waterlogged well,but the influence decreases with return period increasing.When the storm peak position coefficient is higher,the number of overflowed wells is greater,the level of the waterlogging disaster is higher,and the waterlogged area is larger.While demonstrating the effects of storm pattern on pipe network node flood,this paper verifies the rationality of the design storm pattern of the urban central city in Chengdu,which refers to The Hydrological Manual of Sichuan Province,and may help the work of urban drainage planning and waterlogging prevention.