基于SWMM的多情境城市雨洪控制模拟

Simulation of urban rainwater control in multi-scenario based on SWMM

为解决城市雨洪问题,以某市老城区为研究对象,构建暴雨洪水管理模型(SWMM),模拟不同重现期下低影响开发(LID)、绿地景观格局优化等多种情境的雨洪控制效果。研究结果表明不同重现期(2、5、10 a)降雨下,低影响开发和绿地景观格局优化措施均可不同程度地提升研究区的雨洪控制效果,两者的组合模式可以将径流总量和洪峰流量削减至60%以下;不同绿地景观格局优化措施下,平均地增加绿地斑块可以更显著地削减径流总量和径流系数,而在排水压力大的区域增加绿地斑块和绿色雨水廊道能更有效地削减洪峰流量。

In order to solve the problem of urban rain flood,take a city as the research object,build a storm water management model(SWMM),simulate the effects of rain and flood control in various scenarios such as low-impact development(LID)and green space landscape pattern optimization under different recurring periods.Research indicatesUnder different rainfall recurrence periods(2,5,10 a),both low-impact development and green space landscape pattern optimization measures can improve the effect of rainwater control in the study area to varying degrees,the combined mode can reduce the runoff volume and peak flow to less than 60%;Under different green space landscape pattern optimization measures,increasing green patches on average can reduce the total runoff and runoff coefficient more significantly,while adding green patches and green rainwater corridors in areas with high drainage pressure can more effectively reduce flood peak flow.