生物滞留槽的径流过程特征分析

Characteristics of runoff process in bioretention tank

通过试验找出生物滞留槽的径流过程特征,包含径流量减控效果,径流过程减控效果,动态径流系数情况,最后通过模型数值模拟计算得到生物滞留槽动态径流系数。结果表明,若以调控径流量为主要目的,应选择颗粒级配较细、孔隙度较小的生物滞留槽;若以较快消除地表径流为主要任务,则应选择添加高炉矿渣等大粒径颗粒、孔隙度较大的生物滞留槽;生物滞留槽动态径流系数计算公式得出的径流系数拟合相关系数均在0.93以上。

The runoff process characteristics of the bioretention tank were found out through experiments,including runoff reduction control effect,runoff process reduction control effect,dynamic runoff coefficient.Finally,the dynamic runoff coefficient of the bioretention tank was obtained through the numerical simulation of the model.The results show that if the main purpose is to regulate the runoff,the biorestasis tank with smaller particle size and smaller porosity should be selected.If the main task is to eliminate surface runoff quickly,the biorestasis tank with large particle size and large porosity,such as blast furnace slag,should be selected.The fitting correlation coefficients of runoff coefficient obtained from the calculation formula of dynamic runoff coefficient of bioretention tank were all above 0.93.