城市公园绿地雨水径流利用研究

在暴雨或较大降雨强度的条件下城市绿地也会产生地面径流,在建设公园绿地的同时要考虑对公园绿地上雨水径流的收集,并回用于绿地灌溉,而不是简单排入城市排水系统。结合北京市丰台区绿源公园绿地径流的现场试验观测,提出了城市草坪绿地降雨量、降雨强度与径流量的关系,以及不同地面坡度条件下的降雨径流关系,为北京城市绿地雨水径流利用提供了基本依据和基础参数。试验结果表明,降雨量小于9mm时试验坡度的草坪绿地均不产流;次降雨量大于9mm时,绿地的径流效率与次降雨量成正比,而坡地上二者的相关性比平地更加显著。

Research on the Utilization of Rainwater Runoff of City Park Green Space

There will be surface runoff on urban green space under the conditions of heavy rain or greater rainfall intensity.The collection of rainwater runoff should be considered in the construction of park green space,and the water should be reused for green space irrigation rather than simple discharge to city drainage system.Based on the on-site tests and observation of the green space runoff of Luyuan Park in Fengtai District of Beijing,the relationship among the rainfall,rain intensity and runoff volume of urban turf green space and in the conditions of different ground slope are put forward,which provides basic foundation and porameters for the utilization of rainwater runoff on the city green space of Beijing.The experimental results show that there is no runoff on test slops of any declivities with rainfall less than 9mm,and the runoff efficiency and rainfall are in direct proportion with rainfall larger than 9mm,which is more obvious on slope than on flat land.