基于Hydrus-1D模型的LID措施雨水径流控制效应研究

为探究LID措施在不同工况下的雨水径流控制效应,选取生物滞留池、下凹式绿地及透水铺装为研究对象,构建Hydrus-1D模型来模拟分析其雨水径流控制效应。结果表明：生物滞留池的径流量削减率与汇水面积比和蓄水层厚度为正线性相关关系,与种植土厚度(20～40 cm)为负线性相关关系;下凹式绿地的径流量削减率与汇水面积比、雨水口高度和种植土厚度为正线性相关关系;透水铺装的径流量削减率与降雨历时和透水砖渗透系数为正相关关系,与雨峰系数为负相关关系。建议生物滞留池的蓄水层厚度取值为30 cm、种植土厚度取值为30 cm;建议下凹式绿地的汇水面积比不小于15%、雨水口高度取值为10 cm、种植土厚度取值为30 cm;当透水砖渗透系数大于0.291 cm/min时,透水铺装产生的雨水径流较少。

Study on rainwater runoff control effect of LID measures based on Hydrus-1D

In order to explore the rainwater runoff control effects of LID measures under the different conditions,bioretention,sunken lawn and permeable pavement were selected as research objects and the Hydrus-1D models of these LID measures were constructed to simulate and analyze the rainwater runoff control effects.The results show that there is a positive linear correlation between the runoff volume reduction rate of the bioretention and catchment area ratio and aquifer thickness,and a negative linear correlation between the runoff volume reduction rate of the bioretention and soil thickness (20-40 cm).There is a positive linear correlation between the runoff volume reduction rate and catchment area ratio,storm-water inlet height and planting soil thickness of the sunken lawn.The runoff volume reduction rate of the pervious pavement is positively correlated with the rainfall duration and permeability coefficient of pervious brick,and negatively correlated with coefficient of rain front.It is suggested that the aquifer height and planting soil thickness of the bioretention should be 30 cm.The catchment area ratio of the sunken lawn should not be less than 15%,the storm-water inlet height should be 10 cm,and the planting soil thickness should be 30 cm.When the permeability coefficient of permeable brick is greater than 0.291 cm/min,the rainwater runoff generated on permeable pavement is less.