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Article: Evaluation of Green Roof Performance in Mitigating the Impact of Extreme Storms
Title | Evaluation of Green Roof Performance in Mitigating the Impact of Extreme Storms |
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Authors | |
Keywords | Flood management Stormwater modeling SUDS Water sensitive urban design |
Issue Date | 2019 |
Publisher | MDPI AG. The Journal's web site is located at http://www.mdpi.com/journal/water |
Citation | Water, 2019, v. 11 n. 4, article no. 815 How to Cite? |
Abstract | Green roofs are used in urban areas to mitigate the adverse effects of stormwater. Through numerical modeling, this study evaluates the impacts of design parameters on green roof hydrological performance under different rainfall characteristics. A calibrated model is run with long-term precipitation data series for three locations (Hong Kong, China; Beltsville, MD, USA; and Sidney, NY, USA). The results show that the amount of peak runoffreduction increases with the duration of the storm return period in Beltsville and Sidney; while the trend is opposite in Hong Kong. Percentage peak reduction generally shows a decreasing trend with the storm return period in three locations. For average runoffreduction, the amount of reduction increases with the storm return period, whereas the percentage reduction presents an opposite trend in all three locations. The actual values vary between the three locations due to differences in rainfall characteristics. Both peak and average runoffreduction increase with green roof thickness, but in practice, it is not cost effective or feasible to increase the thickness beyond a certain threshold. The hydraulic conductivity can then be optimized for peak runoffreduction and it is found to increase with the return period. However, hydraulic conductivity has a minimal effect on average runoffreduction. Overall, this paper studies green roof hydrological performance in response to different rainfall characteristics and provides recommendations on green roof designs related to soil thickness and hydraulic conductivity. © 2019 by the authors. |
Persistent Identifier | http://hdl.handle.net/10722/274900 |
ISSN | 2023 Impact Factor: 3.0 2023 SCImago Journal Rankings: 0.724 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Liu, X | - |
dc.contributor.author | Chui, TFM | - |
dc.date.accessioned | 2019-09-10T02:31:12Z | - |
dc.date.available | 2019-09-10T02:31:12Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Water, 2019, v. 11 n. 4, article no. 815 | - |
dc.identifier.issn | 2073-4441 | - |
dc.identifier.uri | http://hdl.handle.net/10722/274900 | - |
dc.description.abstract | Green roofs are used in urban areas to mitigate the adverse effects of stormwater. Through numerical modeling, this study evaluates the impacts of design parameters on green roof hydrological performance under different rainfall characteristics. A calibrated model is run with long-term precipitation data series for three locations (Hong Kong, China; Beltsville, MD, USA; and Sidney, NY, USA). The results show that the amount of peak runoffreduction increases with the duration of the storm return period in Beltsville and Sidney; while the trend is opposite in Hong Kong. Percentage peak reduction generally shows a decreasing trend with the storm return period in three locations. For average runoffreduction, the amount of reduction increases with the storm return period, whereas the percentage reduction presents an opposite trend in all three locations. The actual values vary between the three locations due to differences in rainfall characteristics. Both peak and average runoffreduction increase with green roof thickness, but in practice, it is not cost effective or feasible to increase the thickness beyond a certain threshold. The hydraulic conductivity can then be optimized for peak runoffreduction and it is found to increase with the return period. However, hydraulic conductivity has a minimal effect on average runoffreduction. Overall, this paper studies green roof hydrological performance in response to different rainfall characteristics and provides recommendations on green roof designs related to soil thickness and hydraulic conductivity. © 2019 by the authors. | - |
dc.language | eng | - |
dc.publisher | MDPI AG. The Journal's web site is located at http://www.mdpi.com/journal/water | - |
dc.relation.ispartof | Water | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject | Flood management | - |
dc.subject | Stormwater modeling | - |
dc.subject | SUDS | - |
dc.subject | Water sensitive urban design | - |
dc.title | Evaluation of Green Roof Performance in Mitigating the Impact of Extreme Storms | - |
dc.type | Article | - |
dc.identifier.email | Chui, TFM: maychui@hku.hk | - |
dc.identifier.authority | Chui, TFM=rp01696 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.3390/w11040815 | - |
dc.identifier.scopus | eid_2-s2.0-85065039693 | - |
dc.identifier.hkuros | 304852 | - |
dc.identifier.volume | 11 | - |
dc.identifier.issue | 4 | - |
dc.identifier.spage | article no. 815 | - |
dc.identifier.epage | article no. 815 | - |
dc.identifier.isi | WOS:000473105700185 | - |
dc.publisher.place | Switzerland | - |
dc.identifier.issnl | 2073-4441 | - |