[1]ZHANG Chengyu,ZHANG Shouhong,ZHANG Sunxun,et al.Study on Stormwater Control Performance of Green Roofs in Different Climatic Zones Based on SWMM Simulations[J].Research of Soil and Water Conservation,2023,30(02):422-430.[doi:10.13869/j.cnki.rswc.2023.02.010]
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Study on Stormwater Control Performance of Green Roofs in Different Climatic Zones Based on SWMM Simulations

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 02 Page number: 422-430 Column: Public date: 2023-03-10
Title:
Study on Stormwater Control Performance of Green Roofs in Different Climatic Zones Based on SWMM Simulations
Author(s):
ZHANG Chengyu1, ZHANG Shouhong1,2, ZHANG Sunxun1, YAN Jing1, WEI Liangyi1, YANG Hang1, WANG Renzhongyuan1
(1.School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China; 2.Beijing Engineering Research Center of Soil and Water Conservation, Beijing 100083, China)
Keywords:
green roof;  stormwater control;  SWMM;  climatic zone;  substrate depth
CLC:
P333
DOI:
10.13869/j.cnki.rswc.2023.02.010
Abstract:
The comparative study of the stormwater control performance of green roofs in different climatic zones can provide scientific support and references for the hydrological design and evaluation of green roofs in cities in different climatic zones. Based on the monitoring data of the rainfall-runoff process from experimental green roofs in Beijing during 2019, SWMM was calibrated, verified, and applied to simulate and analyze the variation of stormwater control performance of green roofs in some cities(i. e., Beijing, Shanghai, Guangzhou)in different climatic zones. The results are as follows:(1)The light-weight green roof planted with Sedum lineare had excellent stormwater control performance, and average runoff reduction rate and peak runoff reduction rate of experimental green roofs were 73.22% and 77.63%, respectively.(2)The average values of the Nse and R2 during the calibration period were 0.64 and 0.73, and were 0.66 and 0.64 for the validation period, respectively. It indicated that the SWMM could reproduce runoff hydrographs from green roofs.(3)Under different design storm return periods, the runoff reduction rates of green roofs in three cities were different, but they all declined exponentially with the increase of the return period.(4)The runoff reduction rate and peak flow reduction rate of green roofs in three cities increased with the increase of substrate depth, but the reduction rate could not increase when reaching a certain depth, the critical substrate depth of Beijing and Shanghai was 500 mm, and that of Guangzhou was 800 mm. In summary, climate conditions and substrate depth are the main factors that affect the stormwater control performance of green roofs. Therefore, it is necessary to consider all factors comprehensively to achieve the best performance when green roofs are installed in cities in different climatic zones.
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