【摘要】 以宜兴市中心某区域为例,通过参数率定及模型验证,构建了研究区域的SWMM模型,研究了不同重现期(3、10、50、100年)下,雨水花园水文、水质变化情况。结果表明,重现期3～100年条件下,平均径流量、峰值流量、平均径流系数、入渗量、污染物SS负荷总量、COD负荷总量、TN负荷总量、TP负荷总量分别降低11.65%～12.66%、6.82%～8.46%、21.33%～23.26%、22.42%～22.81%、8.98%～10.08%、8.73%～9.84%、7.83%～9.09%、6.36%～8.33%,雨水花园可有效降低平均径流量、峰值流量、平均径流系数,增加入渗量,对污染物SS、COD、TN、TP的负荷总量也有较好的控制效果,为一种有效的海绵措施,且不受降雨重现期大小的影响,呈较为固定的范围。更多还原

【Abstract】 A storm water management model(SWMM)was constructed through parameter calibration and model validation for an urban area of Yixing City.The purpose is to study the hydrological and water quality changes of rainwater gardens in different recurrence periods(3,10,50,100 years).The results show that under recurrence periods 3～100 years,the reductions of the average runoff,peak flow,the average runoff coefficient,the infiltration volume and the corresponding load reductions of SS,COD,TN and TP are 11.65%-12.66%,6.82%-8.46%,21.33%-23.46%,22.42%-22.81%,8.98%-10.08%,8.73%-9.84%,7.83%-9.09%,6.36%-8.33% respectively.Rainwater garden,as an effective sponge measure,can effectively reduce the average runoff,peak flow and average runoff coefficient,as well as increase infiltration and control the total load of SS,COD,TN and TP in the study area.And it is not affected by the size of rainfall recurrence period,showing a relatively fixed range.更多还原