基于SWMM的低冲击开发模式水文效应模拟评估

以深圳市光明新区为研究区域, 根据实地监测资料, 建立暴雨雨水管理模型(SWMM), 模拟城市化前后和加入LID设施 (铺设透水砖和下凹式绿地) 等不同情境的水文过程, 评估城市化对流域水文过程的影响、不同LID措施对雨洪控制的作用及与传统排水管网截流规模的差别。结果显示, 城市化后流域洪峰流量显著增大、洪峰时间提前、径流系数变大, 铺设透水砖和采用下凹式绿地均可有效缓解雨水管网的排洪压力、削减洪峰流量、减小径流系数, 二者组合实施可以更好地发挥控制流量的作用, 增加雨洪资源的利用量。

Hydrological Effect Assessment of Low Impact Development for Urbanized Area Based on SWMM

By field monitoring and simulating with SWMM,this research compared storm water runoff under both pre-and post-development conditions,and modeled two LID control alternatives in Guangming New District of Shenzhen to investigate the process of urbanization on the hydrological impact of LID measures and the different effects of rain and flood control.Results show that,watershed peak flow and runoff coefficient increase significantly,and time of max occurrence becomes earlier after urbanization;permeable pavement and sunken lawn can effectively reduce peak flows and runoff coefficient,and can be effective in relieving the pressure rainwater drainage network;combination of them two can do better in flood control,and then increase the amount of rainwater resources utilization.