绿色屋顶对降雨径流污染物削减的模拟分析  

Simulation analysis of green roofs for reducing pollutants in rainfall runoff

作　　者：陈新拓 彭竹葳 曾小云 吉瑞博 赖承钺 钟科 袁一斌 佘佳 CHEN Xintuo;PENG Zhuwei;ZENG Xiaoyun;JI Ruibo;LAI Chengyue;ZHONG Ke;YUAN Yibin;SHE Jia(Chengdu Research Institute of Environmental Protection Science,Chengdu 610072,China;Chengdu Municipal Engineering Design and Research Institute Co.,Ltd.,Chengdu 610023,China)

机构地区：[1]成都市环境保护科学研究院,成都610072 [2]成都市市政工程设计研究院有限公司,成都610023

出　　处：《给水排水》2024年第S1期224-231,236,共9页Water & Wastewater Engineering

摘　　要：利用SWMM模型进行降雨径流引导的城市面源污染负荷演算,选取TS、COD、NH_(3)-N、TP为污染物浓度指标,分析了不同降雨强度条件下的污染负荷,以及采用绿色屋顶作为低影响开发方式下对降雨径流和径流污染的削减效果。结果表明:模型参数中冲刷系数和冲刷指数对结果影响较大,需通过实验率定,率定后TS、COD、NH3-N、TP的冲刷系数分别为0.000 67、0.000 74、0.001 17、0.000 33,冲刷指数依次为1.12、1.07、1.05、1.23。绿色屋顶能有效推迟降雨径流形成,缩短径流时长并延缓雨峰时间;随着降雨强度增加,绿色屋顶对径流总量和峰值流量的削减率逐渐减小,对于较小强度降雨事件的削减效果明显,对各污染物排放量的削减率均呈现先增加后逐渐稳定的趋势,对于降雨量过大的情况,效果减弱。In this article,the urban non-point source pollution load guided by rainfall runoff has been calculated based on SWMM model.TS,COD,NH_(3)-N,and TP were selected as pollutant concentration indicators to analyze the pollution load under different rainfall intensity conditions,as well as the reduction effect of using green roofs as a low impact development method on rainfall runoff and runoff pollution.The results show that the erosion coefficient and erosion index in the model parameters have a significant impact on the results,and need to be calibrated through experiments.After calibration,the erosion coefficients of TS,COD,ammonia nitrogen,and total phosphorus are 0.00067,0.00074,0.00117,and 0.00033,respectively,with erosion indices of 1.12,1.07,1.05,and 1.23.Green roofs can effectively delay the formation of rainfall runoff,shorten the duration of runoff,and delay the peak rainfall time;As the intensity of rainfall increases,the reduction rate of green roofs on total runoff and peak flow gradually decreases.The reduction effect on smaller intensity rainfall events is obvious,and the reduction rate on various pollutant emissions shows a trend of first increasing and then gradually stabilizing.For situations with excessive rainfall,the reduction effect becomes weaker.

关 键 词：绿色屋顶 SWMM 降雨径流 城市面源 污染削减 低影响开发 

分 类 号：TU992[建筑科学—市政工程]