Influences of landform and urban form factors on urban heat island: Comparative case study between Chengdu and Chongqing
Influences of landform and urban form factors on urban heat island: Comparative case study between Chengdu and Chongqing
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地形和城市形态因素对城市热岛的影响——成都和重庆的比较案例研究
DOI：
10.1016/j.scitotenv.2022.153395
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发表时间：
2022-01-29
影响因子：
9.8
通讯作者：
Han, Guifeng
中科院分区：
文献类型：
--
作者：
Liu, Xue;Ming, Yujia;Han, Guifeng
城市热环境恶化已受到广泛关注，但单中心或多中心城市发展能否缓解城市热岛效应仍存在争议，特别是考虑到平原和山区不同类型的城市。为了填补这一差距，本研究选择了中国冲积平原上的成都和山地地貌上的重庆作为对比。与自然地貌相适应，成都的城市形态以单中心为主，而重庆的城市形态则以多中心为主。研究发现，成都市城市热岛强度高的区域主要分布在城市中心区和周边郊区，而重庆市城市热岛强度高的区域主要分布在周边工业区。空间误差模型和随机森林回归结果表明，植被和水分等自然要素对城市热岛效应的影响和贡献相似。然而，不同的地形和城市形态发挥了关键作用的城市之间的差异。不透水面积和建筑密度是成都城市热岛效应的主导变量，而重庆城市热岛效应的主要贡献因子则是天空景观因子和工业区。研究结果表明，应采取相应的政策措施，优化城市形态，改善城市热环境。
Although the degraded urban thermal environment has been widely concerned, whether monocentric or polycentric urban development can alleviate urban heat island (UHI) is still debatable, particularly considering different types of cities in plain and mountainous settings. To fill the gap, this study chose the cases of Chengdu on alluvial flatlands and Chongqing on mountainous landforms in China for comparison. Adapting to natural landforms, Chengdu has a dominated monocentric urban form, whereas Chongqing has a naturally polycentric urban form. This study found that areas with high UHI intensity were located in the urban center and peripheral suburbs in Chengdu, while those were located in the peripheral industrial zones in Chongqing. The spatial error model and random forest regression results showed that natural elements such as vegetation and water had similar influences and contributions to UHI. However, distinct landforms and urban forms played critical roles in UHI differences among the two cities. Impervious surface and building density were the dominant variables to UHI of Chengdu, while sky view factor and industrial zones were the main contributors to UHI of Chongqing. The findings called for corresponding policy strategies to optimize urban form and improve the urban thermal environment.