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为考察不同降雨强度和内部排水设施的串联对小区绿色雨水系统地面径流量控制效果的影响,采用SWMM暴雨模型建立了江西省南昌市城泰朝阳新城某地块的绿色雨水系统模型,包括地面开放式排水模型和地下管网排水模型,并通过子汇水面积的划分来实现排水设施间的串联与独排。利用模型模拟并分析了不同降雨强度下绿色雨水系统的内部关系对地面径流的影响。结果表明:对于低强度降雨,绿色雨水系统能起到较好的削峰减排效果,当降雨强度为1年一遇时,洪峰削减率达到41%、径流削减率为21.7%;对于高强度、短历时降雨,绿色雨水系统的削峰减排能力减弱,但依然能起到较好的雨水迟滞作用;绿色雨水系统内部排水措施间的有效串联有利于提高整个雨水利用排放系统的效能。
In order to investigate the effect of different rainfall intensities and the series drainage of internal drainage on the control effect of surface runoff of residential green rainwater system, a green rainwater system model of a block of Chengtai Chaoyang New City, Nanchang, Jiangxi Province was established by SWMM storm model, including open ground Drainage model and underground pipe network drainage model, and through sub-catchment area division to achieve the drainage facilities in series and single row. The model was used to simulate and analyze the effect of internal relations of green rainwater system on surface runoff under different rainfall intensities. The results show that the green rainwater system can play a good role in peak reduction and emission reduction for low intensity rainfall. When the rainfall intensity is 1 year, the peak reduction rate reaches 41% and the runoff reduction rate is 21.7%. For the high intensity , Short-term rainfall, and green rainwater system weakened, but still can play a good hysteresis effect of rainwater; effective connection between the internal drainage measures of green rainwater system is conducive to improving the efficiency of the entire rainwater discharge system.