School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou, 310018, China.
Environ Sci Pollut Res Int. 2024 Apr;31(19):28507-28524. doi: 10.1007/s11356-024-33012-7. Epub 2024 Apr 1.
Exploring the impact of complex urban morphology on the urban heat island (UHI) effect is essential for sustainable environmental management and enhancing human well-being. This study explored the combined cooling effect of street canyon geometry and the surrounding built environment using a CatBoost model and the Shapley method. The findings indicated that in streets with low building height and density, a high proportion of sky and vegetation and a flatter skyline are conductive to mitigate UHI effect. In streets with high building height and density, a lower proportion of sky and vegetation, and a well-proportioned skyline, can effectively mitigate UHI effect. Regardless of the building density and height around the street, street trees are the optimal choice for greening construction and improvement of large and medium-sized cities in China, given their high controllability and the current urban stock background. Therefore, reasonable control and allocation of street trees can effectively adjust the street canyon geometry, providing suitable cooling strategies for streets with different surrounding built environments. This study proposed a method to mitigate the UHI effect through street canyon geometry, which can be extended to other high-density urban thermal environment studies and guide policymakers on street construction and urban design.
探索复杂城市形态对城市热岛（UHI）效应的影响，对于可持续的环境管理和提升人类福祉至关重要。本研究采用 CatBoost 模型和 Shapley 方法，探讨了街道峡谷几何形状和周围建筑环境的综合冷却效果。研究结果表明，在建筑高度和密度较低的街道中，较高的天空和植被比例以及较平坦的天际线有利于减轻 UHI 效应。在建筑高度和密度较高的街道中，较低的天空和植被比例以及比例得当的天际线，可以有效减轻 UHI 效应。无论街道周围的建筑密度和高度如何，街道树木都是中国大中城市绿化建设和改善的最佳选择，因为它们具有较高的可控性和当前城市存量背景。因此，合理控制和配置街道树木可以有效调整街道峡谷几何形状，为不同周围建筑环境的街道提供适宜的冷却策略。本研究提出了一种通过街道峡谷几何形状减轻 UHI 效应的方法，该方法可以扩展到其他高密度城市热环境研究中，并为决策者提供街道建设和城市设计方面的指导。
