大理市居住区集雨型绿地模型的构建研究

Study on the Construction of Rainwater-collecting Green Space Model in Dali Residential District

选取大理市下关地区的7个山地居住区作为研究对象,通过SWMM构建雨洪控制模型及模拟雨水径流,对各类子汇水区径流量、下渗量、径流系数,山地居住区影响因素进行分析。结果表明:在山地居住区建设中,提高绿地率可大幅减少地表径流,将地形坡度控制在10.51%以下,设置阶梯式的接地形式,实现层级式雨水径流处理,能有效缓解径流流速和集中径流量;在集雨型设施构建中,下沉式绿地和生物滞留设施的控制指标相对稳定,绿色屋顶因居住区建筑类型的不同差异较大。

In this study,seven mountainous residential areas in Xiaguan area of Dali City were selected as research objects to construct rainwater control model and simulate rainwater runoff by using SWMM.Runoff,infiltration,runoff coefficient,and influencing factors of mountainous residential areas in various sub-catchments were analyzed.The results showed that in the construction of residential areas,the surface’s outflow could be greatly reduced and by increasing the green-space rate.In mountainous residential areas,when the ground slope was controlled below 10.51%.Setting a stepped grounding form was a treatment of dealing with the layered rainwater outflow,which could effectively alleviate the running-off velocity and concentrated runoff.In the construction of the rain-collecting facilities,the control indicators of sunken green spaces and biological detention facilities were relatively stable,and the green roofs varied greatly due to the different types of buildings in the residential areas.