基于SWMM模型的不同LID设施对雨洪控制效果模拟分析

Simulation of Different LID Facilities on Rainwater Control Based on SWMM

为了研究适宜三亚的低影响开发(LID)措施,以三亚市某采用低影响开发建设小区为研究对象,运用SWMM构建模型模拟某子汇水区域采用下凹式绿地、透水铺装和植草格等3种不同LID设施下,遭受不同暴雨重现期下的径流过程,评估3种LID设施对雨洪的削减效果。分析结果表明,低重现期降雨条件下,下凹式绿地对雨洪控制效果较为明显,可充分发挥其对雨水滞留调蓄功能。当然,仅依靠下凹式绿地进行雨洪管理势必对小区的景观园林统筹规划带来困难;因此在实际海绵城市设计中,需要采取多种LID措施并举方式实现对年径流总量控制率的控制。

In order to study the low impact development(LID)measures suitable for Sanya City,a low impact development community in Sanya City is taken as the research object,and the SWMM model is used to simulate the runoff process of a sub-catchment area under three different LID facilities of concave green space,permeable pavement and grass planting grid and different rainstorm recurrence periods.The reduction effect of three LID facilities on rain flood is evaluated.The analysis results show that,under the condition of low recurrence period rainfall,the concave green space has obvious effect on rain flood control.The function of concave green spaces on rainwater retention and storage should be fully played,but relying solely on the concave green space for rainwater and flood management will inevitably bring difficulties to the overall planning of landscape gardens in residential areas.Therefore,in the actual sponge city design,it is necessary to adopt a variety of LID measures to achieve the control rate of annual total runoff.