低影响开发措施的调蓄池代用模型应用研究

Application study on the model of replacing LID measures with storage tank

将暴雨洪水管理模型(storm water management model,SWMM)中的调蓄池模型作为低影响开发(low impact development,LID)设施的代用模型进行雨洪模拟,工程应用中可在没有具体LID参数条件下,采用所研究模型替代LID措施进行城市雨洪径流过程模拟。根据研究区域下垫面的用地性质、建设年份、建筑密度判断LID实施的难易程度,并采用模糊综合评判法将其分为5种地块,在5种地块上设置LID,根据单位面积调蓄深度(地块调蓄总容积与地块面积的比值)的大小,给出不同地块的LID最佳组合范式,并将各地块的LID方案采用代用模型进行替换。将代用模型应用于工程实例进行模拟,得到该排水区在不同重现期条件下的降雨径流过程,评价排水区实施LID措施的应用效果。

The storage tank in storm water management model(SWMM) is proposed as an alternative model for low impact development(LID) facilities to simulate storm flood. In engineering applications, usually under the condition of no specific LID parameters,the studied model is used to replace LID to simulate urban stormwater runoff processes. First of all, the difficulty to conduct LID is judged according to the nature of land use,construction year,building density of the study area,and the fuzzy comprehensive evaluation method is adopted to divide the areas into five kinds of plots. Then, LID measures are set on the 5 plots, and the LID optimal combination paradigm of different blocks is given according to the size of the storage depth per unit area(the ratio of the storage volume of the plot to the plot area).The LID schemes of various areas are replaced by surrogate models.The surrogate model is applied to engineering examples for simulation to obtain the processes of rainfall and runoff in this drainage area under different recurrence periods,and to evaluate the application effect of LID measures in drainage areas under different recurrence periods.