摘要
基于Green-Ampt理论,建立了生物滞留池水分运动数学模型,研究了不同降雨工况下生物滞流池产流过程及设计参数对设施水文效应的影响特性。结果表明:三种设计降雨工况下,生物滞留池产流峰值均显著小于径流峰值,产流延时均大于500 min,得到了较好的径流调控效果,但随着降雨强度增大,设施的产流时刻提前,对径流峰值削减能力有所减弱;在四种设计参数中,内部储水区高度对地下水排放比例影响最大,填料层厚度、填料渗透系数和蓄水层深度的影响微弱;填料渗透系数对表层积水时长影响最大,其次为填料层厚度和蓄水层深度,内部储水区高度几乎没有影响;填料层厚度和内部储水区高度对径流量削减率影响最大,其次为填料渗透系数,蓄水层深度影响最小;蓄水层深度对径流峰值削减率影响最大,其次为填料层厚度及渗透系数,内部储水区高度影响甚微。
Based on the Green-Ampt theory,a mathematical model of water movement in bioretention pond was established.The outflow process of bioretention pond and the influence of four design parameters on the hydrological effect of facility were studied under different rainfall conditions.Based on the results,under the three design rainfall conditions,the outflow peak value of bioretention is less than the peak value of the rainfall runoff,and the outflow delay is more than 500 min,which has a good runoff regulation effect.However,with the increase of the rainfall intensity,the outflow time of the facility is ahead of time,and the reduction capacity of runoff peak is weakened.Among the four design parameters,the height of the internal water storage area has the greatest influence on the proportion of groundwater discharge,while the thickness of the filling layer,the permeability of the filler layer and the depth of the surface aquifer have a weak influence.The permeability of the filler layer has the greatest impact on the surface ponding time,followed by the thickness of the filler layer and the depth of the surface aquifer,and the height of the internal water storage area has little effect.The thickness of the filler layer and the height of the internal water storage area have the largest impact on the runoff reduction rate,followed by the permeability of the filler layer,and the depth of the surface aquifer layer has the smallest effect.The depth of the surface aquifer layer has the greatest impact on the runoff peak reduction rate,followed by the thickness and the permeability of the filler layer,and the height of the internal water storage area has little effect.
作者
潘俊奎
胡国平
刘佳维
夏英志
PAN Jun-kui;HU Guo-ping;LIU Jia-wei;XIA Ying-zhi(School of Civil&Traffic Engineering,Henan University of Urban Construction,Pingdingshan 467036,China)
出处
《河南城建学院学报》
2021年第5期42-50,共9页
Journal of Henan University of Urban Construction
基金
重庆市自然科学基金(cstc2018jcyjAX0445)。
