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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 technology is an important method for planning and designing low-impact rainwater facilities in urban areas. The Urban Rainstorm Treatment and Analysis Integrated Modeling System (SUSTAIN) was used to study the planning of rainwater facilities with low impact in Block A of a certain city. Peak runoff, total runoff and runoff coefficient reduction of rainwater facilities under different rainfall periods. The results showed that the development of rainwater facilities with green roof, water-permeable pavement, concave green space, rainwater garden and dry grass ditch can reduce the peak rainfall runoff and runoff and reduce The ground runoff coefficient, of which 1 to 5 years, once the runoff and peak flow of rainfall basically reached 100% reduction in 10 to 100 years, once the case of rainfall has been reduced to varying degrees, can significantly reduce the downstream channels and municipal pipe network outside the displacement , Relieve the load of urban drainage system and river flood discharge, and provide reference for the effective utilization of urban low impact rainwater facilities.