基于SWMM模型的低影响开发模式雨洪控制利用效果模拟与评估

Rainwater Control and Utilization Effect Assessment and Simulation of Low Impact Development Based on SWMM

以江苏省淮安市郦城国际小区为例,介绍了SWMM模型中的低影响开发(LID)模块,运用SWMM模型模拟了该区域现状用地场景及下凹式绿地、渗透路面、植被浅沟单独布设和3种LID措施组合布设场景在不同设计降雨重现期下的管道出口断面径流过程,评估了不同LID措施的雨洪控制利用效果。结果表明,各LID措施均具有减小径流系数、削减洪峰流量、推迟峰现时刻的作用,其雨洪控制利用效果在低重现期更显著,尤以组合LID措施的效果最佳。

The Licheng international district in Huaian City, Jiangsu Province was taken as an example, the LID module in SWMM model was presented. SWMM model is used to simulate the process of runoff at different rainfall re- turn periods under post-development, sunken lawn, porous pavement, vegetative swale conditions and combination of them. And then this paper assesses the rainwater control and utilization effect of different LID measures. The results show that low impact development can effectively reduce runoff coefficient and peak flows, postpone the time of peak flow the rainwater control and utilization effect is more significant in low return period especially, combination of LID measures have the best effect.