Impact of wind-induced resuspension on urban air quality: a CFD study with air quality data comparison
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Date
2025-02-25
Authors
Linda, Jakub
Hasečič, Amra
Pospíšil, Jiří
Kudela, Libor
Brzezina, Jáchym
0000-0002-2420-3078Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
NATURE PORTFOLIO
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Abstract
Wind-induced particulate matter (PM) resuspension is an increasingly recognized contributor to urban air pollution. A CFD model of 2D street canyon geometry was developed that can replicate the process of resuspension. Model created the wind speed vs concentration increase due to resuspension relationship and its key properties: threshold wind speed causing resuspension (TWSR) and concentration increase. At least 8.75 m/s in 10 m height inlet wind speed before street canyons was needed to start the resuspension, leading to PM10 concentrations often exceeding 1 mu g/m(3), with peak values reaching as high as 3 mu g/m(3). The model can predict the behavior of resuspension well, but it cannot capture all the factors acting in the real environment to match precisely the air quality data. Silt load remains the greatest unknown factor in determining the overall magnitude of resuspension, with observed increases in PM10 concentrations up to 6 mu g/m(3) in air quality data.
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Citation
npj Climate and Atmospheric Science. 2025, vol. 8, issue 1, p. 1-14.
http://nature.com/articles/s41612-025-00969-2
http://nature.com/articles/s41612-025-00969-2
Document type
Peer-reviewed
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Published version
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Language of document
en