基于SWMM模型的绿色屋顶雨洪控制与效益分析

Stormwater Control and Benefit Analysis of Green Roof Based on SWMM Model

水环境安全一直是困扰我国社会经济健康发展的重要问题,低影响开发技术在应对水环境安全问题方面具有良好的韧性。以沧州中欧绿色产业园为研究区域,建立该区域的暴雨雨洪模型和雨水资源利用效益化模型。研究发现,绿色屋顶对地面径流具有明显的控制作用,径流总量的削减率和控制率分别为56.31%、68.32%,峰值流量削减率为48.58%,对TP、TN、SS、COD四种污染物的控制率分别为72.92%、74.82%、74.44%、73.89%;随着降雨强度的提高,径流控制率、污染物浓度控制率降低,分别呈现显著的四次、五次幂函数负相关关系;经测算,绿色屋顶能够产生较好的经济效益和环境效益。

Water environment safety has always been an important issue that plagues the healthy development of country’s social economy. Low-impact development technologies have good resilience in dealing with water environment safety issues. Taking Cangzhou China-Europe Green Industrial Park as the research object, the rainstorm flood model and the rainwater resource utilization benefit model were established. The study found that green roofs have an obvious control effect on ground runoff. The reduction rate and control rate of the total runoff are 56.31% and 68.32%, respectively, and the peak flow reduction rate is 48.58%. The control rate for pollutants of TP, TN, SS and COD is 72.92%, 74.82%, 74.44% and 73.89%, respectively. However, with the increase of rainfall intensity, the runoff control rate and the pollutant concentration control rate decreased, showing a significant negative correlation between the fourth and fifth power functions. After calculation, green roof can produce better economic and environmental benefits.