不同管网平面布置形式下低影响开发的雨洪控制效果研究

以福州市晋安区解放溪流域某居民区为研究对象,选取3种不同的低影响开发措施(渗透铺装,植被浅沟雨水花园,绿色屋顶)设计了4种布设情景.根据芝加哥降雨过程线模型合成不同降雨重现期、不同降雨历时和不同雨峰位置的降雨情景,基于PCSWMM软件分析正交式和平行式排水管网平面布置形式下的低影响开发措施的雨洪控制情况.研究结果表明:在降雨重现期较小、降雨历时较长及雨峰位置靠前时,平行式的低影响开发措施对出水口峰值流量的削减效果要优于正交式.在不同降雨特性下,平行式的渗透铺装、绿色屋顶和低影响开发组合措施对出水口悬浮颗粒物峰值浓度的削减效果要优于正交式,而正交式的植被浅沟雨水花园措施对出水口悬浮颗粒物峰值浓度的削减效果要优于平行式.本研究可为海绵城市建设过程中排水管网的平面布置及低影响开发措施的选择提供依据和借鉴.

Study on stormwater control effects of low impact development measures under different drainage pipe network plane layout forms

This paper presents the results of orthogonal and parallel stormwater drainage network layout types impact on stormwater control effects of 4 low impact development (LID) measures (permeable pavement, vegetative swale & rain garden, green roof, LID combination) in a high-density residential area of the Jiefangxi watershed, Jinan District, FuZhou City. Stormwater runoff and LID controls under different rainfall characteristics (return period, duration and peak position) were modeled by the PCSWMM 2015 developed by the Computational Hydraulics International. The findings are that When in small rainfall return period, long rainfall duration and early rain peak occurrence, the reduction effects on outlet peak flow of 4 LID measures under parallel type was better than orthogonal type. Under different rainfall characteristics, the reduction effects of permeable pavement, green roof and LID combination measure on outlet SS peak concentration under parallel type were better, and the reduction effects of vegetative swale & rain garden on outlet SS peak concentration under orthogonal form was better. The study can provide scientific evidence to screen the optional choices from two types of stormwater drainage network layout and the LID measures in the process of sponge city construction.