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Mean and turbulent mass flux measurements in an idealised street network

Carpentieri, Matteo, Robins, Alan, Hayden, Paul and Santi, Edoardo (2018) Mean and turbulent mass flux measurements in an idealised street network Environmental Pollution, 234. pp. 356-367.

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Pollutant mass fluxes are rarely measured in the laboratory, especially their turbulent component. They play a major role in the dispersion of gases in urban areas and modern mathematical models often attempt some sort of parametrisation. An experimental technique to measure mean and turbulent fluxes in an idealised urban array was developed and applied to improve our understanding of how the fluxes are distributed in a dense street canyon network. As expected, horizontal advective scalar fluxes were found to be dominant compared with the turbulent components. This is an important result because it reduces the complexity in developing parametrisations for street network models. On the other hand, vertical mean and turbulent fluxes appear to be approximately of the same order of magnitude. Building height variability does not appear to affect the exchange process significantly, while the presence of isolated taller buildings upwind of the area of interest does. One of the most interesting results, again, is the fact that even very simple and regular geometries lead to complex advective patterns at intersections: parametrisations derived from measurements in simpler geometries are unlikely to capture the full complexity of a real urban area.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Santi, Edoardo
Date : March 2018
DOI : 10.1016/j.envpol.2017.11.069
Copyright Disclaimer : © 2017 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords : Wind tunnel; Neighbourhood scale; Urban areas; Pollutant exchanges; Turbulent fluxes
Depositing User : Clive Harris
Date Deposited : 27 Nov 2017 11:46
Last Modified : 21 Aug 2018 15:05

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