| 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,0,():-. |
| WANGCHAOYUE,LIFANGHONG,HANZHONGMIN,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,0,():-. |
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| 摘要: |
| 【目的】为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，对比了恒定和芝加哥两种不同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。汇水面积比增大一倍，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年的降雨，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： |
| 分类号:P333.1 |
| 基金项目: |
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| Hydrologic Responses of Bioretention Systems to the Stormwater Runoff of Shijiazhuang |
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WANGCHAOYUE1, LIFANGHONG1, HANZHONGMIN2, ZHUJIDONG3, YANGJIAN1, LIUZHINING1, QUWENJING1
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1.Hebei GEO University;2.China National Environmental Protection Group;3.China GEO-Engineering Corporation
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| Abstract: |
| 【Objective】To study the hydrological responses of bioretention systems to the stormwater runoff in Shijiazhuang City,【Method】combined with laboratory experiments and the numerical model of HYDRUS, the outflow characteristics of two different rainfall patterns, constant and Chicago, were compared. Sensitivities of soil hydraulic characteristic parameters was analyzed. The effects of the catchment area and the thickness of the planting soil layer were discussed. The influences of rainfall in different return periods (N) on the outflow were predicted.【Result】Relative to the constant rainfall, Chicago rainfall postpones the bottom outflow time and extends the ponding time. The sensitive hydraulic parameters mainly include the soil saturated permeability coefficient Ks, the saturated water content θs and the empirical parameter α. The increase in Ks accelerates the peak value of the bottom drainage rate, and brings forward the peak time. The increment in θs extends the latency time and decreases the outflow volume with a less ponding time. The rise in α enlarges the outflow volume. When the catchment area ratio is doubled, the peak value of the bottom drainage rate, the peak reduction rate and the ponding time rise by 13%, 33% and 3 times, respectively, whereas the latency time shortens by 16%. Changes in the thickness of the planting soil layer have no significant effects on the results.【Conclusion】The bioretention system has excellent permeability, and more than 90% of the rainwater can seep through the planting soil layer. When the return period of the rainfall is no more than 5 years, no overflow occurs, with the peak reduction rate of 40.6%~76.5%, and the latency time is greater than 1 h with a ponding time less than 2 h. |
| Key words: bioretention; stormwater runoff; HYDRUS; numerical simulations; Shijiazhuang |
