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Article

Seasonal Variation in Recovery Process of Rainwater Retention Capacity for Green Roofs

by 1,2, 1,*,†, 1 and 3
1
Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China
2
Department of Natural Resources & Environmental Sciences, University of Illinois Urbana-Champaign, Urbana, IL 61801, USA
3
Department of Engineering, Systems and Environmental Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, VA 22908, USA
*
Author to whom correspondence should be addressed.
Current address: Room 414, E Building, Peking University Shenzhen Graduate School, Lishui Road, Xili, Nanshan District, Shenzhen 518055, China.
Academic Editors: Jiake Li, Xiang Zhang and An Liu
Water 2022, 14(18), 2799; https://doi.org/10.3390/w14182799
Received: 6 August 2022 / Revised: 28 August 2022 / Accepted: 3 September 2022 / Published: 8 September 2022
Green roofs need to quickly recover their water retention capacity between rainfall events to maintain their rainwater retention performance. In this study, the authors observed the rainwater retention, recovery process, and plant eco-physiological performance of green roofs with four local vegetation species under a typical subtropical monsoon climate for two years. The half-life of the water content after each rainfall (T50) was used to describe the recovery rate. The results indicate that (1) the decline in the water content after rainfall can be well described by an exponential decline curve (R2 > 0.7), and the average T50 of green roofs with Plectranthus prostratus Gürke was the shortest among the four plants; (2) the T50 in the wet season was significantly shorter than that in the dry season (p < 0.01) because of the seasonal variations in the weather conditions and eco-physiological activity, such as vegetation coverage and transpiration; (3) the rainwater retention of green roofs for rainfall events in the wet season was significantly lower than that in the dry season due to a relatively short antecedent dry period; (4) plants with a high maximum photosynthetic capacity, a strong root system, drought resistance, and large vegetation coverage were recommended as green roof plants. Above all, P. prostrates was found to be the best choice in the study. View Full-Text
Keywords: green roof; rainwater retention; recovery process; seasonal variation; weather condition; plant eco-physiology green roof; rainwater retention; recovery process; seasonal variation; weather condition; plant eco-physiology
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MDPI and ACS Style

Hu, Y.; Qin, H.; Ouyang, Y.; Yu, S.-L. Seasonal Variation in Recovery Process of Rainwater Retention Capacity for Green Roofs. Water 2022, 14, 2799. https://doi.org/10.3390/w14182799

AMA Style

Hu Y, Qin H, Ouyang Y, Yu S-L. Seasonal Variation in Recovery Process of Rainwater Retention Capacity for Green Roofs. Water. 2022; 14(18):2799. https://doi.org/10.3390/w14182799

Chicago/Turabian Style

Hu, Yinchao, Huapeng Qin, Yiming Ouyang, and Shaw-Lei Yu. 2022. "Seasonal Variation in Recovery Process of Rainwater Retention Capacity for Green Roofs" Water 14, no. 18: 2799. https://doi.org/10.3390/w14182799

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