基于源头减排的雨水系统排水能力提升研究

Study on Improving Drainage Capacity of Rainwater Systems Based on Source Control

摘要:

为探究提升雨水系统排水能力的策略与技术方法，基于海绵城市建设理念，研究分析了源头减排、过程调蓄和末端调蓄对雨水系统排水能力提升的影响。结果表明，（1）合适的源头减排设施能有效提升雨水系统排水能力；过程调蓄和末端调蓄对设置点下游有峰值控制效果，对设置点上游无明显峰值控制效果，但对设置点上游的排水管渠有一定保障作用。（2）在有限的调蓄空间下实现较好的峰值控制效果，建议源头减排系统采取稳定边进水、边出水的控流模式。（3）以上海地区为例，由于土壤入渗率低，透水铺装和传统雨水花园对径流峰值控制效果一般；延时调节设施对径流峰值控制有显著效果，能有效提升雨水系统排水能力。

Abstract:

To explore the strategies and technical methods for improving the drainage capacity of rainwater systems, and based on the concept of sponge city construction, the impacts of source reduction, process storage and regulation, and terminal storage and regulation on enhancing rainwater system drainage capacity are studied and analyzed. The results indicate that (1) The appropriate source reduction facilities can effectively improve the drainage capacity of rainwater systems. The process and terminal storage and regulation have a peak flow control effect downstream of the installation point, but have no significant peak control effect upstream of the installation point, while providing a certain protective effect on the drainage pipelines and channels upstream of the installation point. (2) A favorable peak flow control effect is achieved under limited storage space. It is suggested that source reduction systems is used of a stable flow control mode of simultaneous inflow and outflow. (3) Taking the area of Shanghai as an example, due to the low soil infiltration rate, the permeable pavement and traditional rainwater gardens have a moderate effect on runoff peak control. The delay adjustment facilities demonstrate a significant effect on runoff peak control and can effectively enhance the drainage capacity of rainwater systems.