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Temperature Reduction Effects of Rooftop Garden Arrangements: A Case Study of Seoul National University

Author

Listed:
  • Jaekyoung Kim

    (Department of Landscape Architecture and Rural Systems Engineering, Seoul National University, Seoul 08826, Korea)

  • Sang Yeob Lee

    (Department of Landscape Architecture and Rural Systems Engineering, Seoul National University, Seoul 08826, Korea)

  • Junsuk Kang

    (Department of Landscape Architecture and Rural Systems Engineering, Seoul National University, Seoul 08826, Korea
    Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
    Interdisciplinary Program in Landscape Architecture, Seoul National University, Seoul 08826, Korea
    Interdisciplinary Program in Urban Design, Seoul National University, Seoul 08826, Korea)

Abstract

Increasing urbanization has highlighted the need for more green spaces in built-up areas, with considerable attention of vertical installations such as green walls and rooftop gardens. This study hypothesizes that the rooftop-garden-induced temperature reduction effects vary depending on the type of arrangements. Therefore, the objective of this study is to find the most efficient arrangement of the roof gardens for temperature reduction. This paper presents the results of a quantitative analysis of the temperature reduction effect of rooftop gardens installed on structures and sites on the campus of Seoul National University. An ENVI-Met simulation is utilized to analyze the effects of roads, buildings, green areas, and vacant land on temperature and humidity. The effects of the following five rooftop garden configurations were compared: extreme, linear (longitudinal), linear (transverse), checkerboard, and unrealized rooftop gardens. The extreme and linear (longitudinal) gardens achieved the maximum temperature reduction, −0.3 °C, while the lowest maximum reduction of −0.2 °C was achieved by the checkerboard pattern. Over larger areas, the greatest impact has been recorded in the mornings rather than in the afternoons. The results of this study will be useful for those planning and installing rooftop gardens at the district and city levels.

Suggested Citation

  • Jaekyoung Kim & Sang Yeob Lee & Junsuk Kang, 2020. "Temperature Reduction Effects of Rooftop Garden Arrangements: A Case Study of Seoul National University," Sustainability, MDPI, vol. 12(15), pages 1-17, July.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:15:p:6032-:d:390561
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    References listed on IDEAS

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    1. Junyan Yang & Beixiang Shi & Geyang Xia & Qin Xue & Shi-Jie Cao, 2020. "Impacts of Urban Form on Thermal Environment Near the Surface Region at Pedestrian Height: A Case Study Based on High-Density Built-Up Areas of Nanjing City in China," Sustainability, MDPI, vol. 12(5), pages 1-18, February.
    2. Jou-Man Huang & Liang-Chun Chen, 2020. "A Numerical Study on Mitigation Strategies of Urban Heat Islands in a Tropical Megacity: A Case Study in Kaohsiung City, Taiwan," Sustainability, MDPI, vol. 12(10), pages 1-21, May.
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    Cited by:

    1. Jaekyoung Kim & Junsuk Kang, 2020. "Analysis of Flood Damage in the Seoul Metropolitan Government Using Climate Change Scenarios and Mitigation Technologies," Sustainability, MDPI, vol. 13(1), pages 1-28, December.
    2. Jinsil Park & Yeeun Shin & Suyeon Kim & Sang-Woo Lee & Kyungjin An, 2022. "Efficient Plant Types and Coverage Rates for Optimal Green Roof to Reduce Urban Heat Island Effect," Sustainability, MDPI, vol. 14(4), pages 1-17, February.
    3. Fatma Balany & Nitin Muttil & Shobha Muthukumaran & Man Sing Wong & Anne W. M. Ng, 2022. "Studying the Effect of Blue-Green Infrastructure on Microclimate and Human Thermal Comfort in Melbourne’s Central Business District," Sustainability, MDPI, vol. 14(15), pages 1-26, July.

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