Modeling Green Roof Potential to Mitigate Urban Flooding in a Chinese City
Abstract
The Middle and Lower Reaches of the Yangtze River (MLRYR) region, which has humid subtropical climate conditions and unique plum rain season, is characterized by a simultaneous high-frequency urban flooding and reduction in groundwater levels. Retrofitting the existing buildings into green roofs is a promising approach to combat urban flooding, especially for a densely developed city. Here, the application potential of the Green Roof System (GRS) and the Improved Green Roof System (IGRS) designed to divert overflowing water from green roofs to recharge groundwater were analyzed in a densely developed city, Nanchang, China. For the first time, the influence of GRS on the hydraulic condition of Combined Sewage System/Storm Water System (CSS/SWS) is analyzed, which is a direct reflection of the effect of GRS on alleviating urban flooding. The simulation results show that GRS can retain about 41–75% of precipitation in a 2-hour timescale and the flooding volumes in the GRS/IGRS region are 82% and 28% less than those of the Traditional Roof System (TRS) in 10- and 100-yr precipitation events, respectively. In the continuous simulations, GRS also enhances Evapotranspiration (ET), which accounts for 39% of annual precipitation, so that reduces the cumulative surface runoff. Considering the IGRS can providemore »
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Biological and Environmental Research (BER); National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); Fundamental Research Funds for the Central Universities of China
- OSTI Identifier:
- 1642331
- Alternate Identifier(s):
- OSTI ID: 1695743
- Grant/Contract Number:
- AC02-05CH11231; 41972244; 2018A030313165; 11618340
- Resource Type:
- Published Article
- Journal Name:
- Water (Basel)
- Additional Journal Information:
- Journal Name: Water (Basel) Journal Volume: 12 Journal Issue: 8; Journal ID: ISSN 2073-4441
- Publisher:
- MDPI
- Country of Publication:
- Switzerland
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; green roof; urban flooding; groundwater recharge; hydrological benefit; rainwater retention
Citation Formats
Liu, Li, Sun, Liwei, Niu, Jie, and Riley, William J. Modeling Green Roof Potential to Mitigate Urban Flooding in a Chinese City. Switzerland: N. p., 2020.
Web. doi:10.3390/w12082082.
Liu, Li, Sun, Liwei, Niu, Jie, & Riley, William J. Modeling Green Roof Potential to Mitigate Urban Flooding in a Chinese City. Switzerland. https://doi.org/10.3390/w12082082
Liu, Li, Sun, Liwei, Niu, Jie, and Riley, William J. Wed .
"Modeling Green Roof Potential to Mitigate Urban Flooding in a Chinese City". Switzerland. https://doi.org/10.3390/w12082082.
@article{osti_1642331,
title = {Modeling Green Roof Potential to Mitigate Urban Flooding in a Chinese City},
author = {Liu, Li and Sun, Liwei and Niu, Jie and Riley, William J.},
abstractNote = {The Middle and Lower Reaches of the Yangtze River (MLRYR) region, which has humid subtropical climate conditions and unique plum rain season, is characterized by a simultaneous high-frequency urban flooding and reduction in groundwater levels. Retrofitting the existing buildings into green roofs is a promising approach to combat urban flooding, especially for a densely developed city. Here, the application potential of the Green Roof System (GRS) and the Improved Green Roof System (IGRS) designed to divert overflowing water from green roofs to recharge groundwater were analyzed in a densely developed city, Nanchang, China. For the first time, the influence of GRS on the hydraulic condition of Combined Sewage System/Storm Water System (CSS/SWS) is analyzed, which is a direct reflection of the effect of GRS on alleviating urban flooding. The simulation results show that GRS can retain about 41–75% of precipitation in a 2-hour timescale and the flooding volumes in the GRS/IGRS region are 82% and 28% less than those of the Traditional Roof System (TRS) in 10- and 100-yr precipitation events, respectively. In the continuous simulations, GRS also enhances Evapotranspiration (ET), which accounts for 39% of annual precipitation, so that reduces the cumulative surface runoff. Considering the IGRS can provide more hydrological benefits than the GRS under the same climate conditions, we may conclude that the widespread implementation of both the GRS and the IGRS in Nanchang and other densely developed cities in the MLRYR region could significantly reduce surface and peak runoff rates.},
doi = {10.3390/w12082082},
journal = {Water (Basel)},
number = 8,
volume = 12,
place = {Switzerland},
year = {Wed Jul 22 00:00:00 EDT 2020},
month = {Wed Jul 22 00:00:00 EDT 2020}
}
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