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The Cooling Effect of an Urban River and Its Interaction with the Littoral Built Environment in Mitigating Heat Stress: A Mobile Measurement Study

Author

Listed:
  • Yasha Wang

    (Faculty of Design and Architecture, Zhejiang Wanli University, Ningbo 315100, China)

  • Wanlu Ouyang

    (Department of Building and Real Estate, The Hong Kong Polytechnic University, Hong Kong, China
    Institute of Future Cities, The Chinese University of Hong Kong, New Territories, Hong Kong, China)

  • Qingming Zhan

    (School of Urban Design, Wuhan University, Wuhan 430072, China
    Research Center of Digital City, Wuhan University, Wuhan 430072, China)

  • Li Zhang

    (Collage of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China)

Abstract

Rivers within urban areas could influence the thermal environment by modifying air temperature (AT) and relative humidity (RH). To further explore the cooling effect of a large river on surrounding urban areas, we conducted mobile measurements near the Yangtze River in Wuhan during a hot and humid summer day. This research examined the river cooling effect, determined the thresholds of the cooling and humidifying distance using a third-order polynomial method, assessed littoral heat stress at the pedestrian level and investigated the impact of the littoral built environment using stepwise regression analysis. The results revealed that (1) the cooling and humidifying effect of the river was up to 3.55 °C, 1741 m and 17.25%, 1369 m in the daytime, which was much greater than that at night; (2) the river significantly mitigated pedestrian heat stress within 1200 m from the riverbank in the daytime, but showed a weak negative effect at night; (3) the built environment has a significant impact on the littoral areas, e.g., urban greening during the daytime and building morphology at night. The findings of this study provide empirical evidence for the cooling effect of a large river in urban areas and further support climate-sensitive planning and design for our thermal environment.

Suggested Citation

  • Yasha Wang & Wanlu Ouyang & Qingming Zhan & Li Zhang, 2022. "The Cooling Effect of an Urban River and Its Interaction with the Littoral Built Environment in Mitigating Heat Stress: A Mobile Measurement Study," Sustainability, MDPI, vol. 14(18), pages 1-16, September.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:18:p:11700-:d:917985
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    References listed on IDEAS

    as
    1. Alisa L. Hass & Kelsey N. Ellis & Lisa Reyes Mason & Jon M. Hathaway & David A. Howe, 2016. "Heat and Humidity in the City: Neighborhood Heat Index Variability in a Mid-Sized City in the Southeastern United States," IJERPH, MDPI, vol. 13(1), pages 1-19, January.
    2. Eduardo Bassolino & Valeria D’Ambrosio & Alessandro Sgobbo, 2021. "Data Exchange Processes for the Definition of Climate-Proof Design Strategies for the Adaptation to Heatwaves in the Urban Open Spaces of Dense Italian Cities," Sustainability, MDPI, vol. 13(10), pages 1-31, May.
    3. He, Bao-Jie & Wang, Junsong & Zhu, Jin & Qi, Jinda, 2022. "Beating the urban heat: Situation, background, impacts and the way forward in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 161(C).
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