深圳民治河流域低影响开发措施水文效应评估

低影响开发措施为一类较为有效的城市雨洪管理方法,在海绵城市建设中应用较为广泛。为评估其水文效应,以深圳民治河流域为研究区域,构建SWMM城市雨洪模型,设计3种LID措施方案,分别计算不同重现期降雨情形下3种LID措施实施前后的径流过程。结果表明:透水铺装和下凹式绿地等LID措施均对峰现时间有一定的延迟作用,对洪峰流量和径流量均有不同程度的削减效果,且洪峰流量和径流量的削减率均随着降雨重现期增大而减少,透水铺装和下凹式绿地两者的组合实施可以更好地发挥控制径流作用。

Hydrological effect evaluation of low impact development measures at Minzhi river basin in Shenzhen

The Low Impact Development (LID) measures are the effective methods for urban rainstorm management, and are widely used in the construction of sponge city. To evaluate its hydrological effect, taking the Minzhi river basin in Shenzhen as the research area, the SWMM model is constructed. Three LID measure projects are designed, and the runoffs before and after the construction of the three LID measures at rainfall situation with different design return period are calculated respectively. The results showed that the LID measures, such as permeable pavement and concave green space, have different degrees of delay effect on flood peak time and different degrees of reduction effect on flood peak and volume of runoff, and the reduction effect decreases as the rainfall return period increases. The best results can be achieved by the combination of permeable pavement and concave green space at the same time, and they will play a better role of runoff control.