暴雨条件下绿化屋顶产流机制研究暴雨条件下绿化屋顶产流机制研究.pdf

Journal of Water Resources Research 水资源研究, 2014, 3(1), 20-28 /10.12677/jwrr.2014.31004 Published Online February 2014 (/journal/jwrr.html) Study on the Runoff Generation Mechanism of Green Roofs under Stormwater Scenarios Ting Sun, Wenyu Yang, Guangheng Ni Department of Hydraulic Engineering, Tsinghua University, Beijing Email: sunt05@ Received: Sep. 30th th th , 2013; revised: Nov. 20 , 2013; accepted: Nov. 26 , 2013 Copyright © 2014 Ting Sun et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In accordance of the Creative Commons Attribution License all Copyrights © 2014 are reserved for Hans and the owner of the intellectual property Ting Sun et al. All Copyright © 2014 are guarded by law and by Hans as a guardian. Abstract: Green roofs (GRs) are widely employed in urban areas to mitigate the detrimental impacts by stormwater flooding. However, a simple yet physical method for assessing the hydrological performance of GR is still lacking. In this study, we first perform an analysis on the relationship between rainfall depth P and runoff amount R based on the water balance principle and discuss the different runoff generation mechanisms on GR. A field experiment is then conducted to examine the P-R relationship constructed in the previous analysis, which demonstrates good validity in estimating runoff generated on our GR. Numeric simulations via HYDRUS-1D are then carried out to investigate the runoff generat