不同LID设施组合对区域雨洪控制效果的影响模拟

为研究不同LID设施组合对区域雨洪控制效果的影响，以南京市雨花台区一区域为研究区构建了暴雨径流管理模型，在模型中分别设定4种LID设施组合来模拟分析研究区2年一遇、3年一遇、5年一遇、10年一遇降雨条件下的地表径流、排水管网溢流及污染物排放情况。结果表明:不同LID设施组合对研究区均有减小径流量、缓解节点溢流和削减污染物排放量的作用，但随着降雨重现期的增大，对雨洪控制效果降低；以绿色屋顶和透水铺装为主，加以适当比例生物滞留设施和雨水花园的LID设施组合对研究区的雨洪控制效果较好。

Simulation on influence of regional rain-flood control effect under different combinations of LID measures

To study the effect of regional rain-flood control under different combinations of LID measures, a storm water management model is established by taking a region in Yuhuatai District, Nanjing as the study subject. Four combinations of LID measures are added to the model respectively to simulate and analyze the situations of surface runoff, node overflow and pollutant discharge in the study region under the condition of two-year, three-year, five-year, and ten-year rainfalls. The results show that different combinations of LID measures could decrease surface runoff, mitigate node overflow and reduce pollutant discharge in the study region. However, with the increase of rainfall recurrence period, the effect of rain-flood control is reduced. Giving priority to green roof and permeable pavement, with appropriate proportion of biological detention facilities, and the combination of rainwater garden facilities, have a better control effect on the rain-flood in the study area combination of LID measures which includes many green roofs, many permeable pavements, a appropriate proportion of biological retention measures and rainwater gardens has a better effect on the rain-flood control in the study region.