Impacts of rainfall and catchment characteristics on bioretention cell performance  

作　　者：Yan-wei Sun Christine Pomeroy Qing-yun Li Cun-dong Xu 

机构地区：[1]School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450011,China [2]Department of Civil and Environmental Engineering,University of Utah,Salt Lake City,UT 84112,USA

出　　处：《Water Science and Engineering》2019年第2期98-107,共10页水科学与水工程（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grants No.2017YFC0403600 and 2017YFC0403604);the National Natural Science Foundation of China(Grants No.41401038,41501025,and 51579102)

摘　　要：Although many studies have evaluated the impacts of bioretention cell (BRC) design elements on hydrologic performance,few have investigated the roles played by site characteristics and rainfall patterns.The objectives of this study were to assess the impacts of rainfall and catchments with different characteristics on the hydrologic performance of BRCs and identify important factors in sizing bioretention when hydrologic performance was oriented for the design using a modeling approach.A 10-year record of rainfall data was used to identify the frequency and magnitude of rainfall events.The results showed that although the small and medium rainfall events were dominant they contributed less to the total rainfall depth than the large rainfall events.The ratio of runoff coefficient to imperviousness can be used as an indicator to explain why BRCs perform differently with the same design strategy under the same rainfall events.Rainfall patterns had significant impacts on the hydrologic performance of BRCs by influencing the overflow and underdrain flow.BRCs performed better for rainfall events with a longer duration and lower rainfall intensity because they generated smoother runoff processes into the BRCs.On the basis of these results,the runoff coefficient is suggested for BRC surface design.Although many studies have evaluated the impacts of bioretention cell(BRC)design elements on hydrologic performance,few have investigated the roles played by site characteristics and rainfall patterns.The objectives of this study were to assess the impacts of rainfall and catchments with different characteristics on the hydr-ologic performance of BRCs and identify important factors in sizing bioretention when hydrologic performance was oriented for the design using a modeling approach.A 10-year record of rainfall data was used to identify the frequency and magnitude of rainfall events.The results showed that although the small and medium rainfall events were dominant they contributed less to the total rainfall depth than the large rainfall events.The ratio of runoff coefficient to imperviousness can be used as an indicator to explain why BRCs perform differently with the same design strategy under the same rainfall events.Rainfall patterns had significant impacts on the hydrologic performance of BRCs by influencing the overflow and underdrain flow.BRCs performed better for rainfall events with a longer duration and lower rainfall intensity because they generated smoother runoff processes into the BRCs.On the basis of these results,the runoff coefficient is suggested for BRC surface design.

关 键 词：BIORETENTION cell RAINFALL Runoff Hydrologic MODEL STORMWATER management MODEL (SWMM) 

分 类 号：TV[水利工程]