Modeling green roofs' cooling effect in high-density urban areas based on law of diminishing marginal utility of the cooling efficiency: A case study of Xiamen Island, China

JOURNAL OF CLEANER PRODUCTION

卷:316

Article

Lin, Meixia^1,2  Dong, Jing³  Jones, Laurence⁴  Liu, Jiakun⁵  Lin, Tao¹  Zuo, Jin³  Ye, Hong¹  Zhang, Guoqin¹  Zhou, Tiejun⁶ 

[1] Chinese Acad Sci, Inst Urban Environm, Key Lab Urban Environm & Hlth, Xiamen 361021, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Tianjin Univ, Sch Architecture, Tianjin 300072, Peoples R China

[4] Environm Ctr Wales, UK Ctr Ecol & Hydrol, Bangor LL57 2UW, Gwynedd, Wales

[5] Univ Utrecht, Fac Geosci, Dept Human Geog & Spatial Planning, NL-3584 CB Utrecht, Netherlands

[6] Chongqing Univ, Fac Architecture & Urban Planning, Chongqing 400045, Peoples R China

关键词: Green roof;    Cooling effect;    Urban heat island;    Spatial model;    High-density urban areas;    Urban planning;   

DOI  :  10.1016/j.jclepro.2021.128277

来源: Elsevier

【 摘 要 】

There is in general good awareness of the potential role of green roofs to regulate urban thermal environments, but a lack of effective spatial modeling of this cooling effect for a given roof greening scheme at the city scale. This study proposes a simplified and feasible approach to simulate the cooling effect provided by green roofs as a mitigation option to combat urban heat island effects in high-density urban areas. In this study, we established a spatial model of the cooling effect of green roofs, which integrated remote sensing methods and a statistical model based on the law of diminishing marginal utility of the cooling efficiency of green roofs (DMUCE) deduced from previous studies. A case study in Xiamen City, China demonstrates the applicability and implications of the model. Our modeling clearly simulated the size and strength of the urban cool island and its variation under different green roof scenarios. We found that green roofs play an important part in moderating the thermal environment in areas where larger green spaces and waterbodies are largely absent. When the proportion of green roofs is implemented at scale, roofs that are only partly green can also create some extra cool islands (not merely normal islands) in high-density urban areas, equivalent to small green spaces and waterbodies. The sensitivity analysis of the cooling effect indicated that the maximum potential benefit of heat island reduction ranged from 4.04 km(2) to 9.75 km(2) when the coverage of green roofs was extended to the entire Xiamen Island. Besides, our results suggested that all proposed strategies would not remarkably moderate the thermal environment in the north of Xiamen Island, where urban planners should pay more attention in the future.

【 授权许可】

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