基于SWMM的不同坡度路侧生物滞留带水文性能分析

Analysis on Hydrological Performances of Bioretention Zone along Road with Different Slopes Based on SWMM

摘要:

针对坡度对生物滞留带水文性能以及海绵城市设施面积的影响，通过SWMM模型，分别在四种不透水比例下，研究了二十种不同道路纵坡的径流产流过程，确定了每种不透水比例下的海绵城市设施面积；再通过“容积法”对比计算了以上不透水比例下的海绵城市设施面积；最后对模型和“容积法”得出的海绵城市设施面积的差异及其原因进行了比较分析，对“容积法”进行了改进。研究得出了以下结论：坡度越大，最大径流量、径流过程流量以及总的外排流量越大，但影响不显著；不透水面积比例越大，最大径流量、径流过程流量以及总的外排流量越大，且影响显著；海绵城市设施面积不受道路坡度影响，但受不透水面积比例影响，且呈线性正相关；“容积法”对海绵城市设施面积计算均偏小，修正后的“容积法”能够较好地计算海绵城市设施面积。

Abstract:

Aiming at the influence of slope on the hydrological performances of bioretention zone and the area of sponge urban facilities, through SWMM model, the runoff production processes of more than 20 different road longitudinal slopes are studied respectively at four impermeable ratios, and the area of sponge urban facilities is clarified at each impermeable ratio. And through the "volume method", the areas of sponge urban facilities are compared and calculated at the above impermeable ratios. Finally, the differences and causes of sponge urban facility areas obtained by the model and "volume method" are compared and analyzed, and the "volume method: is improved. The study conclusion shows that the higher the slope, the greater the maximum runoff, runoff process flow and total discharge, but the influence is not obvious. The largest the impermeable area proportion, the largest the maximum runoff, runoff process flow and total discharge, and the influence is obvious. The area of sponge urban facilities is not affected by the road slope, but is influenced by the impermeable area proportion, and there is a positive linear correlation. The calculation of sponge urban facility area is small by the "volume method". The "volume method" after revised can better calculate the area of sponge urban facilities.