Gao Jianping, Pan Junkui, Hu Ning, Xie Chengzuo
School of Civil Engineering, Chongqing Jiaotong University, 66 Xuefu Avenue, Nanan District, Chongqing 400074, China E-mail:
Water Sci Technol. 2018 Apr;77(7-8):1829-1837. doi: 10.2166/wst.2018.048.
Bioretention can be an effective measure for stormwater treatment. However, there is a lack of systematic analysis of the impact of bioretention design parameters on hydrologic performance. Herein, SWMM and RECARGA models were applied to generate the typical annual rainfall runoff and simulate the water balance of the bioretention system in an expressway service area. The purpose of the investigation was to identify key design parameters for the bioretention system and delineate the priorities in developing the design. Results showed that the average groundwater recharge ratios for bioretention basins with and without an underdrain were 58.29% and 92.27%, respectively, the average overflow ratios were 4.13% and 4.19%, the average evapotranspiration ratios were 4.48% and 4.47%, and the average outflow ratio for bioretention with an underdrain was 33.94%. The ratio of the bioretention area to drainage area, and the saturated infiltration rates of planting soil and native soil were the main factors influencing water balance, while the underdrain diameter and gravel layer depth exerted little effect. Based on the impact analysis, multivariate nonlinear regression models of runoff reduction rate for two types of bioretention basin were established, which both exhibited high determination coefficients and acceptable Nash-Sutcliffe coefficients.
生物滞留是一种有效的雨水处理措施。然而，目前缺乏对生物滞留设计参数对水文性能影响的系统分析。在此，应用SWMM和RECARGA模型生成典型年降雨径流，并模拟高速公路服务区生物滞留系统的水平衡。本研究的目的是确定生物滞留系统的关键设计参数，并明确设计开发的优先事项。结果表明，有和没有排水暗管的生物滞留池的平均地下水回灌率分别为58.29%和92.27%，平均溢流率分别为4.13%和4.19%，平均蒸发散率分别为4.48%和4.47%，有排水暗管的生物滞留池的平均出流率为33.94%。生物滞留面积与排水面积之比、种植土和原生土的饱和渗透速率是影响水平衡的主要因素，而排水暗管直径和砾石层深度的影响较小。基于影响分析，建立了两种类型生物滞留池径流削减率的多元非线性回归模型，模型的决定系数均较高，Nash-Sutcliffe系数也较为理想。
