基于SWMM的海绵改建小区雨水径流调控研究

Regulation of Stormwater Runoff in Sponge Reconstructed Community Based on SWMM

以北京通州某建筑小区海绵改建示范项目为研究对象,利用SWMM雨水管理模型,依据降雨径流实测数据率定、校验模型参数,构建了海绵改建小区雨水径流多级调控系统,分析了海绵改造前后以及不同情景下LID设施参数、管道参数等对雨水调控能力的影响。结果表明,一级LID措施调控后年径流总量控制率可达到41.51%~57.40%、污染物削减率均在25%以上;二级调控雨水管道尺寸最为有效,当排水沟底宽或最大深度增加60%时,可保证小区10年一遇降雨重现期下无积水现象发生;三级调控蓄水池容积,可以实现小区3年一遇降雨重现期下无积水现象发生,同时雨水资源利用率达到3.93%。

A multi-level regulation system of stormwater runoff in a sponge reconstruction demonstration project of a residential community of Tongzhou,Beijing was established by SWMM software.The model parameters were calibrated and verified by measured rainfall data.The influence of LID facilities and pipeline parameters on stormwater regulation capability before and after sponge reconstruction at different scenarios was analyzed.After the first-level regulation,annual runoff control rate could reach 41.51%-57.40%,and the reduction rate of pollutants was more than 25%.The secondary level regulation of storm pipeline size was the most effective.No ponding took place in the area during the rainfall with 10-year return period when the bottom width or the maximum depth of drainage ditch increased by 60%.The third level regulation of reservoir volume could realize no ponding in the community during the rainfall with 3-year return period,and the utilization rate of rainwater resource could reach 3.93%.