Fang Yan, Du Xintong, Zhao Haiyue, Hu Miao, Xu Xiaoming
School of Landscape Architecture, Beijing Forestry University, China.
School of Landscape Architecture, Beijing Forestry University, China.
Environ Res. 2023 Nov 15;237(Pt 1):116857. doi: 10.1016/j.envres.2023.116857. Epub 2023 Aug 12.
Against the backdrop of global warming, rapid urbanization has caused the aggregation of urban building spaces and the heat island effect is becoming increasingly serious, hindering sustainable urban development. In order to investigate the potential and methods of green roofs in different types of neighborhoods to mitigate the urban heat island effect, this study used multivariate data for surface temperature inversion and local climate zone (LCZ), and the potential of green roofs to reduce the heat island effect was evaluated by combining LCZ zoning and ENVI-met prediction model. Finally, a multi-scenario analysis with economic factors was conducted to derive the optimal implementation path for green roofs. The results show that in LCZs 1-9, the green roof can reduce the daytime average air temperature by a maximum of 0.41 °C for 0.5 m of the LCZ8 roof and 0.37 °C for 1.2 m of the LCZ6 pedestrian. Based on the surface cooling efficiency of LCZ green roofs get the best green roof construction order: LCZ3, LCZ6, LCZ8 > LCZ2, LCZ5, LCZ7 > LCZ1, LCZ4, LCZ9. The construction of green roofs for the heat island areas within the fifth ring road of Beijing can reduce the area of high-temperature and sub-high-temperature zones by 52.55% and 29.17%, respectively, compared with the area without green roof construction. The study clarifies the technical methodology system of cooling efficiency of green roofs in different types of neighborhoods and the reduction of the urban-scale heat island effect, which provides a reference for the planning of green roofs for urban buildings.
在全球变暖的背景下，快速城市化导致城市建筑空间聚集，热岛效应日益严重，阻碍了城市可持续发展。为了研究不同类型社区中绿色屋顶缓解城市热岛效应的潜力和方法，本研究使用多源数据进行地表温度反演和局部气候区（LCZ）划分，并结合LCZ分区和ENVI-met预测模型评估绿色屋顶减少热岛效应的潜力。最后，进行了包含经济因素的多情景分析，以得出绿色屋顶的最佳实施路径。结果表明，在LCZ 1-9中，对于LCZ8屋顶0.5米高度，绿色屋顶可使白天平均气温最多降低0.41℃；对于LCZ6行人高度1.2米，可降低0.37℃。基于LCZ绿色屋顶的地表降温效率得出最佳绿色屋顶建设顺序：LCZ3、LCZ6、LCZ8＞LCZ2、LCZ5、LCZ7＞LCZ1、LCZ4、LCZ9。与未建设绿色屋顶的区域相比，北京五环路以内热岛区域建设绿色屋顶可使高温区和次高温区面积分别减少52.55%和29.17%。该研究阐明了不同类型社区绿色屋顶降温效率及减少城市尺度热岛效应的技术方法体系，为城市建筑绿色屋顶规划提供了参考。
