山地丘陵城市汇水区划分方法及内涝模拟分析

Catchment Division Method and Flooding Simulation Analysis of Mountainous and Hilly Cities

构建山地丘陵城市排水管网模型时,山岭大面积的雨水汇水区成为研究者必须考虑的问题。针对山岭汇水特点和非线性水库汇流模型的缺陷,提出基于等流时线的山岭汇水区划分方法,将山岭雨水通过虚拟节点和管段排入管网系统。以Z市某辖区排水管网的InfoWorks ICM模拟过程为例,研究了基于等流时线的汇水区划分方法和常规泰森多边形汇水区划分方法对模拟结果的影响。结果表明,采用基于等流时线的山岭汇水区划分方法时,模拟结果与山岭地区雨水汇流过程更为吻合,对该类区域排水管网的排水能力评估和内涝模拟具有一定的借鉴意义。

When establishing drainage pipe network model in a mountainous and hilly city,researchers must take into account the problem of large rainwater catchments in the mountainous areas.Aiming at the characteristics of stormwater confluence in the mountain and the defects of non-linear reservoir conflux model,a catchment division method for the mountain based on isochrones was proposed,and stormwater in the mountain was discharged into the pipe network system through virtual nodes and pipes. An example of a drainage system in a district of Z city simulated by InfoWorks ICM software was given,and the effect of catchment division methods based on isochrones and conventional Thiessen polygon on the simulation results were explored. The simulation results were more consistent with the stormwater conflux process in the mountain area when the method based on isochrones was adopted,which had certain reference significance for the drainage capacity evaluation and urban flooding simulation of drainage pipe network in similar regions.