Bannister, Edward J., Cai, Xiaoming, Zhong, Jian ORCID: https://orcid.org/0000-0003-1026-8695 and Rob MacKenzie, A. (2020) Neighbourhood-scale flow regimes and pollution transport in cities. Boundary-Layer Meteorology, 179. pp. 259-289. ISSN 0006-8314 (Print), 1573-1472 (Online) (doi:10.1007/s10546-020-00593-y)

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Abstract

Cities intimately intermingle people and air pollution. It is very difficult to monitor or model neighbourhood-scale pollutant transport explicitly. One computationally efficient way is to treat neighbourhoods as patches of porous media to which the flow adjusts. Here we use conceptual arguments and large-eddy simulation to formulate two flow regimes based on the size of patches of different frontal-area density within neighbourhoods. One of these flow regimes distributes pollutants in counter-intuitive ways, such as producing pollution ‘hot spots’ in patches of lower frontal-area density. The regimes provide the first quantitative definition of the ‘urban background’, which can be used for more precisely targeted pollution monitoring. They also provide a conceptual basis for further research into neighbourhood-scale air-pollution problems, such as parametrizations in mesoscale models, and the transport of fluid constituents in other porous media.

Item Type:	Article
Uncontrolled Keywords:	neighbourhood scale, scalar transport, urban background, urban canopy, urban pollution
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences N Fine Arts > NA Architecture Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Computing & Mathematical Sciences (CMS)
Last Modified:	17 Jan 2025 15:58
URI:	http://gala.gre.ac.uk/id/eprint/49376

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