International Low Impact Development Conference China 2016
Behavior of Soil Moisture in a Retentive Green Roof System
Publication: International Low Impact Development Conference China 2016: LID Applications in Sponge City Projects
ABSTRACT
This study was carried out to investigate the amount of evapotranspiration caused by changes in soil moisture of a retentive green roof. Two lab-scale experiments under the same conditions were conducted, with and without a retention board. An artificial rainfall simulator was used to control rainfall intensities at 20, 40, and 60 mm/h. The roof with the retention board showed the largest difference at 60 mm/h rainfall intensity. After a 10-day drying period, conventional and retentive green roofs experienced a similar amount of evapotranspiration; however, soil moisture content of the retention board was higher for the bottom layer, as it conserved water. Furthermore, unlike conventional green roofs, the retention board could prevent the transfer of heat from inside to outside in winter or outside to inside in summer, thus reducing energy consumption. Consequentially, this study shows that retentive green roofs address multiple climate change impacts, by providing relief from urban storms and reducing the impacts of extreme temperatures, thereby complementing conventional green roofs.
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Information & Authors
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Published In
International Low Impact Development Conference China 2016: LID Applications in Sponge City Projects
Pages: 223 - 230
Editors: Haifeng Jia, Ph.D., Tsinghua University, Shaw L. Yu, Ph.D., University of Virginia, Robert Traver, Ph.D., Villanova University, Huapeng Qin, Ph.D., Peking University Shenzhen Graduate School, Junqi Li, Ph.D., Beijing University of Civil Engineering and Architecture, and Mike Clar, Ecosite, Inc.
ISBN (Online): 978-0-7844-8104-2
Copyright
© 2017 American Society of Civil Engineers.
History
Published online: Dec 4, 2017
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