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Numerical Investigations of Urban Pollutant Dispersion and Building Intake Fraction with Various 3D Building Configurations and Tree Plantings

Author

Listed:
  • Qingman Li

    (Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China
    Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, Sun Yat-sen University, Zhuhai 519000, China
    These authors contributed equally to this work.)

  • Jie Liang

    (Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China
    Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, Sun Yat-sen University, Zhuhai 519000, China)

  • Qun Wang

    (Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China
    These authors contributed equally to this work.)

  • Yuntong Chen

    (Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China)

  • Hongyu Yang

    (Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China
    Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, Sun Yat-sen University, Zhuhai 519000, China)

  • Hong Ling

    (Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China
    Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, Sun Yat-sen University, Zhuhai 519000, China)

  • Zhiwen Luo

    (School of Construction Management and Engineering, University of Reading, Whiteknights, Reading RG6 6AH, UK)

  • Jian Hang

    (Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China
    Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, Sun Yat-sen University, Zhuhai 519000, China)

Abstract

Rapid urbanisation and rising vehicular emissions aggravate urban air pollution. Outdoor pollutants could diffuse indoors through infiltration or ventilation, leading to residents’ exposure. This study performed CFD simulations with a standard k-ε model to investigate the impacts of building configurations and tree planting on airflows, pollutant (CO) dispersion, and personal exposure in 3D urban micro-environments (aspect ratio = H/W = 30 m, building packing density λ p = λ f = 0.25) under neutral atmospheric conditions. The numerical models are well validated by wind tunnel data. The impacts of open space, central high-rise building and tree planting (leaf area density LAD = 1 m 2 /m 3 ) with four approaching wind directions (parallel 0° and non-parallel 15°, 30°, 45°) are explored. Building intake fraction < P_IF > is adopted for exposure assessment. The change rates of < P_IF > demonstrate the impacts of different urban layouts on the traffic exhaust exposure on residents. The results show that open space increases the spatially-averaged velocity ratio ( VR ) for the whole area by 0.40–2.27%. Central high-rise building (2 H ) can increase wind speed by 4.73–23.36% and decrease the CO concentration by 4.39–23.00%. Central open space and high-rise building decrease < P_IF > under all four wind directions, by 6.56–16.08% and 9.59–24.70%, respectively. Tree planting reduces wind speed in all cases, raising < P_IF > by 14.89–50.19%. This work could provide helpful scientific references for public health and sustainable urban planning.

Suggested Citation

  • Qingman Li & Jie Liang & Qun Wang & Yuntong Chen & Hongyu Yang & Hong Ling & Zhiwen Luo & Jian Hang, 2022. "Numerical Investigations of Urban Pollutant Dispersion and Building Intake Fraction with Various 3D Building Configurations and Tree Plantings," IJERPH, MDPI, vol. 19(6), pages 1-34, March.
  • Handle: RePEc:gam:jijerp:v:19:y:2022:i:6:p:3524-:d:772530
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    References listed on IDEAS

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    1. Mingjie Zhang & Zhi Gao & Xin Guo & Jialei Shen, 2021. "Ventilation and Pollutant Concentration for the Pedestrian Zone, the Near-Wall Zone, and the Canopy Layer at Urban Intersections," IJERPH, MDPI, vol. 18(21), pages 1-23, October.
    2. Sandra E. Zaeh & Kirsten Koehler & Michelle N. Eakin & Christopher Wohn & Ike Diibor & Thomas Eckmann & Tianshi David Wu & Dorothy Clemons-Erby & Christine E. Gummerson & Timothy Green & Megan Wood & , 2021. "Indoor Air Quality Prior to and Following School Building Renovation in a Mid-Atlantic School District," IJERPH, MDPI, vol. 18(22), pages 1-14, November.
    3. Wenjing Ji & Bin Zhao, 2015. "Estimating Mortality Derived from Indoor Exposure to Particles of Outdoor Origin," PLOS ONE, Public Library of Science, vol. 10(4), pages 1-15, April.
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    Cited by:

    1. Mei Wu & Guangwei Zhang & Liping Wang & Xiaoping Liu & Zhengwei Wu, 2022. "Influencing Factors on Airflow and Pollutant Dispersion around Buildings under the Combined Effect of Wind and Buoyancy—A Review," IJERPH, MDPI, vol. 19(19), pages 1-19, October.
    2. Kinga Szopińska & Agnieszka Cienciała & Agnieszka Bieda & Janusz Kwiecień & Łukasz Kulesza & Piotr Parzych, 2022. "Verification of the Perception of the Local Community concerning Air Quality Using ADMS-Roads Modeling," IJERPH, MDPI, vol. 19(17), pages 1-28, September.

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