Efficient Plant Types and Coverage Rates for Optimal Green Roof to Reduce Urban Heat Island Effect

Green roofs are implemented to reduce the urban heat island effect; however, studies are limited to comparing the reduction in urban heat island effect before and after implementation, and the focus is on the structural stability of the building rather than urban heat island reduction. In this study...

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Bibliographic Details
Published in:Sustainability 2022-02, Vol.14 (4), p.2146
Main Authors: Park, Jinsil, Shin, Yeeun, Kim, Suyeon, Lee, Sang-Woo, An, Kyungjin
Format: Article
Language:English
Subjects:
Building construction
Cities
College campuses
Coverage
Design
Energy consumption
Environmental policy
Grasses
Green buildings
Green roofs
Heat
High rise buildings
Humidity
Infrastructure
Microclimate
Parks & recreation areas
Radiation
Ratios
Roofing
Roofs
Shrubs
Simulation
Sustainable design
Thermal environments
Trees
Urban areas
Urban heat islands
Vegetation
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Summary:Green roofs are implemented to reduce the urban heat island effect; however, studies are limited to comparing the reduction in urban heat island effect before and after implementation, and the focus is on the structural stability of the building rather than urban heat island reduction. In this study, using the sky view factor (SVF) in ENVI-met, a 3D microclimate modeling program, urban spaces were classified as closed, semi-open, and open areas. Meanwhile, the green roof types were subdivided according to the vegetation coverage rates, which included grass, shrubs, and trees. The vegetation ratio was evaluated using ENVI-met to determine which of the 10 scenarios was most effective for each urban space. The thermal environment was most comfortable in semi-open areas. Therefore, the green roof scenario with 70% grass and 30% trees was effective in closed areas, 50% shrubs and 50% trees were best in semi-open areas, and 70% grass with 30% trees, or 30% grass and 70% trees, was best in open areas. This study provides a basis for creating green roof guidelines aimed at improving the urban thermal environment, as well as creating other green infrastructure elements in cities.
ISSN:2071-1050
2071-1050
DOI:10.3390/su14042146