基于GIS和SWMM模型的城市暴雨积水模拟

以海口市海甸岛片区为研究区域,对组成排水系统的排水管网、道路和河道水系等进行合理概化,构建了该片区排水管网水力模型,提出了基于GIS和SWMM的暴雨积水计算方法,采用3场实测暴雨进行模拟分析,所得内涝淹没位置与实际调研情况基本相符,表明本文所提出的方法具有良好的精度和可靠性;分别对重现期为1、2、5、10、20a设计暴雨情形下的管道节点溢流和积水深度进行模拟。结果表明:该模型较好地评估了该片区排水管网排水能力;另外对比了实测暴雨和设计暴雨的积水模拟结果,表明暴雨雨型对模拟结果有重要影响。

Simulation of rainstorm waterlogging in urban areas based on GIS and SWMM model

Taking Haidian islands at Haikou as the study area, the paper reasonably generalized the drainage network, road and river water system of drainage system,and developed the hydraulic calculation model of drainage network,and proposed the calculation method of rainstorm waterlogging.The model is verificated by the three measured rainfall records.The simulated waterlogging submerged positions are basically coincided with the actual investigation situation,which shows that the method proposed has good precision and reliability.It respectively simulated the node overflow of drainage network and waterlogging depth of surface with design rainstorm of return period of 1, 2, 5, 10, 20 years by using the method.The model better evaluated the drainage capacity of drainage pipe network at study area;it compared and analyzed the simulated results of measured and design rainstorm and show that the type of rainfall has important influence on simulation result.