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Open AccessArticle

Spatiotemporal Changes in the Built Environment Characteristics and Urban Heat Island Effect in a Medium-Sized City, Chiayi City, Taiwan

1
Department of Landscape Architecture, National Chiayi University, Chiayi City 60004, Taiwan
2
Department of Civil and Environmental Engineering, National Kaohsiung University, Kaohsiung City 81148, Taiwan
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(1), 365; https://doi.org/10.3390/su12010365
Received: 22 October 2019 / Revised: 27 December 2019 / Accepted: 28 December 2019 / Published: 2 January 2020
(This article belongs to the Collection Sustainable Built Environment)
This study took Chiayi City—a tropical, medium-sized city—as an example to investigate the urban heat island (UHI) effect using mobile transects and built environment characteristics in 2018. The findings were compared to those from a study in 1999 to explore the spatiotemporal changes in the built environment characteristics and UHI phenomenon. The result for the UHI intensity (UHII) during the day was approximately 4.1 °C and at midnight was approximately 2.5 °C. Compared with the survey in 1999, the UHII during the day increased by approximately 1.3 °C, and the UHII at midnight decreased by approximately 1.2 °C. The trend of the spatial distribution of the increasing artificial area ratio (AAR) proved the importance of urban land use expansion on UHI. The results of the air temperature survey were incorporated with the nesting space in GIS to explore the role of built environment characteristics in UHI effects. The higher the population density (PD) and artificial area ratio (AAR) were, the closer the proximity was to the downtown area. The green area ratio (GAR) was less than 0.2 in the downtown area and increased closer to the rural areas. The built environment factors were analyzed in detail and correlated with the UHI effect. The air temperature in the daytime increased with the population density (PD) and artificial area ratio (AAR), but decreased with the green area ratio (GAR) (r = ±0.3–0.4). The result showed good agreement with previous studies. View Full-Text
Keywords: built environment factors; UHI; tropical medium-sized city; artificial area; building coverage rate; green coverage rate; mobile transects built environment factors; UHI; tropical medium-sized city; artificial area; building coverage rate; green coverage rate; mobile transects
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MDPI and ACS Style

Huang, J.-M.; Chang, H.-Y.; Wang, Y.-S. Spatiotemporal Changes in the Built Environment Characteristics and Urban Heat Island Effect in a Medium-Sized City, Chiayi City, Taiwan. Sustainability 2020, 12, 365. https://doi.org/10.3390/su12010365

AMA Style

Huang J-M, Chang H-Y, Wang Y-S. Spatiotemporal Changes in the Built Environment Characteristics and Urban Heat Island Effect in a Medium-Sized City, Chiayi City, Taiwan. Sustainability. 2020; 12(1):365. https://doi.org/10.3390/su12010365

Chicago/Turabian Style

Huang, Jou-Man; Chang, Heui-Yung; Wang, Yu-Su. 2020. "Spatiotemporal Changes in the Built Environment Characteristics and Urban Heat Island Effect in a Medium-Sized City, Chiayi City, Taiwan" Sustainability 12, no. 1: 365. https://doi.org/10.3390/su12010365

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