基于SWMM模型的快速城市化建成区内涝及面源污染模拟研究

Simulation of Waterlogging and Non-Point Source Pollution in Rapid Urbanization Built-Up Area Based on SWMM Model

随着城市化进程的加快,降雨径流产生的城市内涝及径流污染问题日益凸显,降雨径流的研究对城市规划建设提供科学依据。本研究应用SWMM模型,以深圳市宝安区前海片区为研究区域,构建符合研究区域实际情况的降雨模型,模拟不同重现期下降雨径流情况及径流污染产生和分布情况。结果表示,随着降雨量的不断增加,地表径流量、洪峰流量逐渐增加,产生洪峰流量的时间逐渐提前,径流系数增加,且增加幅度有逐渐减小的趋势。此外,随着降雨量的不断增加,由于冲刷产生的径流污染不断增加,城市受纳水体的承污压力不断加大。研究结果表明了不同重现期下城市内涝及径流污染的实际情况,对城市内涝治理及径流污染控制有重要意义。

With the acceleration of urbanization, urban waterlogging and runoff pollution have become in-creasingly prominent. The research of rainfall runoff provides a scientific basis for urban planning and construction. The SWMM model is applied to construct the storm water model in Qianhai Dis-trict, Bao’an District, Shenzhen, China, which simulates rainfall-runoff and runoff pollution gener-ation and distribution in different recurrence periods. The results show that with the increase of rainfall intensity, the total runoff, peak flow and runoff coefficient would augment. The time of generating peak flow is gradually advanced, and the runoff coefficient increases, and the increasing range tends to decrease gradually. In addition, with the increase of rainfall intensity, the pollu-tion-bearing pressure of urban receiving water is increasing caused by the increasing runoff pol-lution. The results reveal that the actual situation of urban waterlogging and runoff pollution in different recurrence periods is of great significance to urban waterlogging control and runoff pol-lution control.