Duan, G. and Takemi, T. and Ngan, Keith (2023) Measuring pollutant exposure using large-eddy simulation and virtual walkers: Analysis of tracer age statistics of idealised urban boundary-layer flows. Sustainable Cities and Society, 93. ISSN 2210-6707, DOI https://doi.org/10.1016/j.scs.2023.104501.
Full text not available from this repository.Abstract
Pollutant exposure in the urban air quality literature has been typically interpreted from data for fixed locations, which provides an incomplete picture of exposure for pedestrians (or moving receptors). The current study proposes a simple model to parameterise the exposure time for a virtual walker to cross a pollutant cloud during its sweeping downstream across the avenue. The parameterisation, which depends on the centre -of-mass translation and the cloud size, shows satisfactory performance in areas away from the outlet, whence a substantial portion of the pollutants is removed from the control domain and a well-defined centre of mass geometrically vanishes. Applying the tracer age diagnostics, the occurrence time of first exposure for the moving receptors is quantified with no particular caution required for the outlet region. The mean tracer age recorded by the virtual walkers is shown to be up to 25%-75% smaller than conventional spatial averages, implying earlier exposure to the pollutants and hence a reference timescale relying on the latter may lead to delayed emergency response. Evacuation route prioritisation based on virtual walker measurements coincides with that indicated by the parameterisation, suggesting the potential usefulness of the model for exposure risk evaluation against atmospheric air pollution incidents.
| Item Type: | Article |
|---|---|
| Funders: | Natural Science Foundation of Liaoning Province of China [2022-KF-18-07], Fundamental Research Funds for the Central Universities, China [3132022135], Environment Research and Technology Development Fund of the Environmental Restoration and Conservation Agency (ERCA) of Japan [JPMEERF20192005] |
| Uncontrolled Keywords: | Air pollution; Evacuation; Virtual walker; Tracer age; Urban flow |
| Subjects: | T Technology > TH Building construction T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Divisions: | Deputy Vice Chancellor (Research & Innovation) Office > Institute of Ocean and Earth Sciences |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 16 May 2024 23:46 |
| Last Modified: | 16 May 2024 23:46 |
| URI: | http://eprints.um.edu.my/id/eprint/38420 |
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