基于SUSTAIN模拟技术的低影响开发雨水设施规划应用研究

RESEARCH FOR APPLICATION OF LOW IMPACT DEVELOPMENT STORMWATER INFRASTRUCTURE PLANNING WITH SUSTAIN

模拟技术是城市低影响开发雨水设施规划设计和研究的重要方法,采用城市暴雨处理及分析集成模型系统(SUSTAIN)对某市A地块的低影响开发雨水设施规划进行研究,分析了低影响开发雨水设施在不同降雨重现期条件下的峰值径流量、径流总量及径流系数的削减效果。结果表明,按照一定比例设置的绿色屋顶、透水铺装、下凹绿地、雨水花园、干草沟等低影响开发雨水设施可以通过下渗和滞蓄作用削减降雨峰值径流量和径流总量,降低了地面径流系数,其中1~5年一遇降雨的径流量和峰值流量基本达到100%削减,10~100年一遇的降雨则有不同程度削减,可显著减少下游渠道和市政管网的外排水量,缓解城市排水系统和河道泄洪的负荷,为城市低影响开发雨水设施的有效利用提供参考。

Simulation is an important method in the field of planning and design for the low impact development stormwater infrastructure. System for Urban Stormwater Treatment and Analysis Integration( SUSTAIN) is used to make a research on the low impact development stormwater infrastructure in a city block of A. It analysised the reduction of the peak flow,the runoff and the runoff coefficient with different periods. The results show that the peak flow,the runoff and the runoff coefficient can be reduced by green roof,porous pavement,bioretention pond,rain garden and vegetative swale by infiltration and detention.With a period of 1 ~ 5 years,the peak flow and the runoff can be reduced to about 100%. While with a period of 10 ~ 100 years,the low impact development stormwater infrastructure can also significantly reduce the discharge of the downstream. It not only alleviates the discharge load of the urban drainage system,but also provides advices for the effective use of urban low impact development Infrastructure.