| Cite this article: | 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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| 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 |
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