摘要
绿色屋顶是城市绿色基础设施的重要组成部分。绿色屋顶雨水截留能力是能够延缓产流时间、削减径流总量的关键,基质层土壤渗透特性则对降雨径流过程的削减具有重要的影响。针对绿色屋顶非降雨期间雨水截留能力变化规律以及降雨产(径)流特点,分别根据土壤水蒸发理论及饱和下渗理论,推导建立了用于描述绿色屋顶非降雨期间雨水截留能力变化过程的指数方程和降雨径流过程的单位线模型。结合绿色屋顶多场次降雨径流实际监测数据,分别对绿色屋顶不同场次降雨截留效果及径流过程进行了动态模拟。结果表明,不同场次降雨径流系数、径流过程计算值与实测值变化趋势均基本符合。
Due to rainwater retention is the main approach to the rainfall-runoff reduction effect of green roof,rainwater retention capacity is an important effective index.Considering the characteristics of rainfall-runoff process and the varying process of rainwater retention capacity during the drought period,a unit hydrograph model to simulate rainfall-runoff process is proposed based on the saturated infiltration theory,and an exponential function of rainwater retention capacity during the drought period is presented based on soil-water evaporation theory.Field rainfall-runoff monitoring on green roof is carried out and the results show that the green roof has a significant impact on runoff volume reduction effect.The runoff volume reduction effects for each rainfall event of green roof are simulated by using the exponential function of rainwater retention capacity during the drought period,and then the rainfall runoff processes are simulated by using the unit hydrograph model.The simulation results show that the trends of the estimated and measured values are consistent.
作者
张启照
ZHANG Qi-zhao(School of Civil Engineering,Zhengzhou Institute of Finance and Economics,Zhengzhou 450000,China)
出处
《中国农村水利水电》
北大核心
2021年第3期93-97,111,共6页
China Rural Water and Hydropower
基金
城市水循环与海绵城市技术北京市重点实验室开放基金(HYD2019OF02)
河南省高等学校重点科研项目(20B880035)。
关键词
绿色屋顶
降雨径流
单位线
截留能力
指数方程
green roof
rainfall runoff process
unit hydrograph
rainwater retention capacity
exponential function
