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Canopy-scale Built-environment Characteristics and Urban Heat Island Effect in a Tropical Medium-sized City

Author

Listed:
  • Jou-Man Huang

    (Department of Landscape Architecture, National Chiayi University, Chiayi City 600355, Taiwan)

  • Heui-Yung Chang

    (Department of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung City 81148, Taiwan)

  • Liang-Chun Chen

    (Department of Landscape Architecture, National Chiayi University, Chiayi City 600355, Taiwan)

  • Yu-Su Wang

    (Department of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung City 81148, Taiwan)

Abstract

Previous studies have found that built-environment characteristics in large cities produce important effects of the urban heat island (UHI) and know the horizontal space affected by the urban canopy microclimate ranges from about 30–200 m, but there are few studies in medium-sized cities. Therefore, this study investigates canopy-scale built-environment characteristics and their correlation with urban heat island (UHI) effects in Chiayi city, a tropical, medium-sized city. Under a 100 m buffer size, 2D and 3D built-environment factors such as the green coverage ratio (GCR), building coverage ratio (BCR), floor area ratio (FAR), and sky view factor (SVF) were first analyzed and then correlated with the UHI effect. The analyses were repeated on 200 and 1000 m scales and compared to previous studies. It was found that the built-environment factors were more strongly correlated with UHI under the 200 m buffer. Moreover, 2D factors such as the GCR and BCR had a higher correlation with UHI, especially in developing medium-sized cities. Regarding the GCR, BCR, and FAR, as expected, the correlation coefficients with UHI increased to 0.4 at 13:00 during the day and changed from 0.2 to 0.4 at 00:30 at night, whereas the correlation between the SVF and UHI was greatly different from the study area or calculation methods. The scale effect and SVF calculation methods are recommended for further study.

Suggested Citation

  • Jou-Man Huang & Heui-Yung Chang & Liang-Chun Chen & Yu-Su Wang, 2021. "Canopy-scale Built-environment Characteristics and Urban Heat Island Effect in a Tropical Medium-sized City," Sustainability, MDPI, vol. 13(2), pages 1-17, January.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:2:p:868-:d:481660
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    References listed on IDEAS

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    1. Hong Jin & Peng Cui & Nyuk Hien Wong & Marcel Ignatius, 2018. "Assessing the Effects of Urban Morphology Parameters on Microclimate in Singapore to Control the Urban Heat Island Effect," Sustainability, MDPI, vol. 10(1), pages 1-18, January.
    2. Thi Mai Nguyen & Tang-Huang Lin & Hai-Po Chan, 2019. "The Environmental Effects of Urban Development in Hanoi, Vietnam from Satellite and Meteorological Observations from 1999–2016," Sustainability, MDPI, vol. 11(6), pages 1-24, March.
    3. Jou-Man Huang & Heui-Yung Chang & Yu-Su Wang, 2020. "Spatiotemporal Changes in the Built Environment Characteristics and Urban Heat Island Effect in a Medium-Sized City, Chiayi City, Taiwan," Sustainability, MDPI, vol. 12(1), pages 1-16, January.
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