| 引用本文: | 王超月,李方红,韩忠民,等.生物滞留池对石家庄市雨水径流的水文响应[J].灌溉排水学报,2022,41(8):87-94. |
| WANG Chaoyue,LI Fanghong,HAN Zhongmin,et al.生物滞留池对石家庄市雨水径流的水文响应[J].灌溉排水学报,2022,41(8):87-94. |
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| 摘要: |
| 【目的】研究生物滞留池对石家庄市雨水径流的水文响应，【方法】结合室内试验和HYDRUS数值模型，对比了恒定降雨模式和芝加哥降雨模式的出流特征，分析了土壤水力特征参数的敏感性，讨论了汇水面积、种植土层厚度的作用，预测了不同重现期降雨对出流的影响。【结果】相对于恒定降雨模式，芝加哥降雨模式推迟底部出流时刻，增长积水时间。敏感性水力特征参数主要为土壤饱和渗透系数Ks、饱和含水率θs和经验参数α；Ks加大，底部排水速率峰值增加，峰值时刻提前；θs增大，延迟时间增加，出流量和积水时间减少；α增大，出流量加大。汇水面积比增大1倍，底部出流峰值提高13%，削峰率增加33%，积水时间加大3倍而延迟时间缩短16%；种植土层厚度的变化对结果影响不显著。【结论】该生物滞留池渗透性能优良，90%以上的雨水可以通过种植土层下渗；对于重现期不超过5 a的降雨，不发生溢流，削峰率变化范围为40.6%~76.5%，延迟时间大于1 h，积水时间不超过2 h。 |
| 关键词: 生物滞留；雨水径流；HYDRUS；数值模拟；石家庄 |
| DOI：10.13522/j.cnki.ggps.2022070 |
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| The Effect of Bioretention Systems on Stormwater Runoff of Shijiazhuang |
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WANG Chaoyue, LI Fanghong, HAN Zhongmin, ZHU Jidong,
YANG Jian, LIU Zhining, QU Wenjing
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1.School of Water Resources and Environment, Hebei GEO University/Hebei Center for Ecological and Environmental Geology Research, Shijiazhuang 050031, China; 2. Hebei Province Key Laboratory of Sustained Utilization and Development of Water Resources, Shijiazhuang 050031, China; 3. Hebei Province Collaborative Innovation Center for Sustainable Utilization of Water Resources and Optimization of Industrial Structure, Shijiazhuang 050031, China; 4. China National Environmental Protection Group, Beijing 100190, China; 5. China GEO-Engineering Corporation, Beijing 100190, China
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| Abstract: |
| 【Objective】Bioretention is a method to purify water, and the aim of this paper is to study its effect on stormwater runoff. 【Method】We took stormwater runoff in Shijiazhuang city as an example, investigating the outflow characteristics of the bioretention system in response to two rainfall patterns, constant pattern and Chicago pattern using column experiment and HYDRUS model. From the simulated results, we analyzed and discussed the sensitivities of the runoff to soil hydraulic parameters, catchment area and thickness of the planting soil layer. We also developed a model to predict the influence of rainfalls with different return periods (N) on outflow.【Result】Compared to constant rainfall, the Chicago rainfall pattern delayed the emergence of outlet-outflow and prolonged the ponding duration on the soil surface. The hydraulic parameters to which the runoff was sensitive include saturated soil permeability Ks, saturated soil water content θs, and the empirical parameter α in the van Genuchten formula. An increase in Ks increased the maximum outlet-drainage rate and brought forward its arrival time. Increasing θs prolonged the latent time and reduced the outflow rate and ponding duration. Increasing the parameter α resulted in an increase in outflow. Doubling the catchment area ratio increased the maximum drainage rate, the peak-reduction rate and ponding duration by 13%, 33% and 300%, respectively, whereas reducing the latent time by 16%. Change in thickness of the planting soil layer did not show a significant effect on the outflow pattern. 【Conclusion】 The bioretention system is more permeable with more than 90% of rainwater flowing through the planting soil layer. When the return period of the rainfall is no more than 5 years, there is no overflow with the peak reduction rate being 40.6%~76.5%, the latent time > 1 h and ponding time < 2 h. |
| Key words: bioretention; stormwater runoff; HYDRUS; numerical simulations; Shijiazhuang |
