基于SWMM模型的重庆某工业园区海绵城市设计验证分析

Verification and Analysis of Sponge City Design in an Industrial Park in Chongqing Based on the SWMM Model

为评估工业园区典型海绵城市设计对年径流总量控制率、径流峰值、节点积水的控制效果,以重庆某工业园区作为研究区域,运用SWMM模型对该区域海绵城市设计进行建模,并进行改进Horton下渗模型计算。研究表明:工业园区年径流控制率主要通过源头LID设施实现,在难以实现时可采用末端调蓄设施;削峰效果仅在重现期P≤1a时可主要通过源头LID设施实现;应合理设计洼地地形及面积,以解决源头LID设施无法吸收的局部积水问题;末端调蓄设施是应对连续降雨产流影响的有效措施。验证分析结果旨在探寻工业园区源头LID设施及末端调蓄设施在满足不同功能时的海绵性能以及两者的搭配原则,以为工业园区海绵城市设计提供技术参考。

To evaluate the effectiveness of a typical sponge city design in an industrial park with regards to annual total runoff control rate,runoff peak reduction,and nodal ponding control,this study selected an industrial park in Chongqing as the research area.The SWMM(Storm Water Management Model)was employed to model the sponge city design within this region,and calculations were performed using an improved Horton infiltration model.The research findings indicate that the annual runoff control rate in industrial parks is primarily achieved through source-based LID(Low Impact Development)facilities,with end-of-pipe storage facilities serving as an alternative when source-based solutions are challenging to implement.Peak flow reduction can primarily be achieved through source-based LID facilities during recurrence intervals of P≤1a.It is crucial to design the depression terrain and area reasonably to address local ponding issues that cannot be absorbed by source-based LID facilities.Furthermore,end-of-pipe storage facilities prove to be effective measures in mitigating the impact of continuous rainfall-generated runoff.The verification and analysis aim to explore the sponge performance of source-based LID facilities and end-of-pipe storage facilities in industrial parks when fulfilling different functions,as well as the principles for their optimal combination.This study provides technical references for the design of sponge cities in industrial parks.