Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1007/s10652-022-09905-x
Licence creative commons licence
Title (Primary) Simulation of particle resuspension by wind in an urban system
Author Banari, A.; Hertel, D.; Schlink, U.; Hampel, U.; Lecrivain, G.
Journal Environmental Fluid Mechanics
Year 2022
Department SUSOZ
Volume 23
Issue 1
Page From 41
Page To 63
Language englisch
Topic T5 Future Landscapes
Keywords Particle resuspension; Turbulent flows; Winds; Urban systems, Simulation
Abstract Air pollution caused by particle resuspension is a growing public health problem in many cities. Pollen and anthropogenic pollutants, such as heavy metal particles and micro-plastics debris, settle onto urban ground surfaces. Prolonged urban heat waves are propitious for heavy and continuous deposition. Particles in the submillimeter size range eventually resuspend by urban winds within seconds, may be inhaled, cause allergic reactions and escape the city’s boundaries. Here, the resuspension and subsequent dispersion of generic particles ranging from 10 to 100 μm in size are simulated. The city area “Bayerischer Bahnhof” in Leipzig, Germany, has been chosen as a practical example. To track the resuspended particles, a Lagrangian model is used. Taking advantage of graphics processing unit, turbulent flow simulations at different wind speeds are performed in almost real time. The results show that particle resuspension starts, when the inlet wind speed beyond the canopy, that is at a height of 40 m, exceeds 7 m/s. At wind speed beyond 14 m/s, resuspension occurs in almost all city parts. At moderate wind speed, high-risk areas are identified. The effect of green infrastructures on both the flow field and particle resuspension is also investigated.
Persistent UFZ Identifier
Banari, A., Hertel, D., Schlink, U., Hampel, U., Lecrivain, G. (2022):
Simulation of particle resuspension by wind in an urban system
Environ. Fluid Mech. 23 (1), 41 - 63