城市雨水管网模型参数的率定与评价

为推动排水管网模型在城市雨水管理领域的应用,建立了上海市某居住小区雨水管网模型,通过实施管道流量测量,对常用产汇流模型的主要参数进行了率定,并对径流体积和洪峰的影响参数进行了灵敏度排序.结果表明:对径流体积与洪峰流量,最主要的影响因素是不透水表面径流系数/有效不透水面积因子和不透水表面比例;对径流体积影响较小的参数是管壁粗糙系数和地面坡度;对洪峰影响较小的参数为透水表面的渗透性能和地面坡度.总体而言,Horton公式参数的灵敏度最大,英国模型参数的灵敏度最小.研究成果可为城市排水管网模型参数的选择与率定提供参考.

Calibration of Urban Stormwater Drainage Model

In order to promote the application of urban storm water drainage model in storm water management in China, a case study of a residential district of Shanghai was carried out. Based on flow survey results, three commonly used rainfall-runoff models were calibrated. Through sensitivity analysis, parameters were ranked according to their effect on runoff volume and peak. The results have shown that runoff volume and peak are most sensitive to the values of fixed runoff percentage and imperviousness. Pipe roughness and catchment slope are minor factors affecting runoff hydrograph. As a whole, the impact of parameter changes of Horton Infiltration Model is larger than those of Green-Ampt Infiltration Model and New UK Percentage Model. The resuits can be used for reference in the selection and calibration of the parameters of urban storm drainage models.