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ORIGINAL RESEARCH article
Front. Built Environ.
Sec. Urban Science
Volume 10 - 2024 |
doi: 10.3389/fbuil.2024.1457295
This article is part of the Research Topic Urban Morphology and Urban Thermal Environment View all 4 articles
Characterizing Urban Heat Islands in Karst Areas-The Case of Guiyang and Kunming in Southwest China
Provisionally accepted
Ruixue Fan
1,2*
Yangyang Wu
1,2*
Qiwei Chen
1,2
Youjin Wang
1
Lianjin Li
1
Dongyu Shi
1
Rong Xu
1
Yuting Xia
1
Yuting Chen
1- 1 School of Geography and Resources, Guizhou Education University, Guiyang, China
- 2 Guizhou Provincial Key Laboratory of Geographic State Monitoring of Watershed, Guizhou Education University, Guiyang, China
Urban heat island (UHI) has posed a threat to sustainable development, and the identification of the spatial characteristics of UHI is a prerequisite for the mitigation of UHI effects. Taking Kunming City and Guiyang City in the karst region of Southwest China as two examples, this study utilized spatial econometric modeling and random forest regression to identify and compare the spatial distribution and impact of urban heat islands related to topographic and urban morphology. The results indicated that the UHI in Kunming and Guiyang mainly monocentrically and polycentrically distributed, respectively, and the urban heat island intensity (UHII) in Kunming was significantly higher than that in Guiyang. The spatial error model effectively reflected the influence of topography and urban form on UHII, and the random forest regression model objectively measured the contribution of different influencing factors to UHII. Enhanced vegetation index (EVI), population density (PD), percentage of impervious surface (PIS), ground sky view factor (GSVF), building density (BD) and percentage of water bodies (PW) had similar effects and contributions to the UHII in the two cities, while urban surface roughness (USR) contributed less than topographic slope (SLOPE) on UHII in Kunming, and the SLOPE contributed less than USR in Guiyang. In the karst ecologically fragile zone, the morphology of Kunming and Guiyang are mainly shaped by the topography, which can be characterized as monocentric and polycentric, respectively. And the UHI distribution and UHII were also closely related to topographic patterns. EVI, SLOPE and PW, all showed inhibitory effects on UHII, and EVI contributed the most. PD, PIS, USR and BD, exacerbate the UHII, with PD contributing the most. The above conclusions can provide a reference for policy makers and urban planners to optimize urban morphology and mitigate urban heat island. ic morpholog 删除[Richelle]: 字体: (默认)Times New Roman, 设置格式[Richelle]: intensity of UHI 删除[Richelle]: urban heat island 删除[Richelle]: urban heat island 删除[Richelle]: heat island 删除[Richelle]: to the heat island 删除[Richelle]: opposite was true for 删除[Richelle]: 删除[Richelle]: intensity of urban heat islands 删除[Richelle]:
Keywords: topography, Urban morphology, Urban Heat Island, Spatial econometric modeling, random forest regression modeling
Received: 30 Jun 2024; Accepted: 30 Aug 2024.
Copyright: © 2024 Fan, Wu, Chen, Wang, Li, Shi, Xu, Xia and Chen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Ruixue Fan, School of Geography and Resources, Guizhou Education University, Guiyang, China
Yangyang Wu, School of Geography and Resources, Guizhou Education University, Guiyang, China
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