Seasonal changing effect on airflow and pollutant dispersion characteristics in urban street canyons

Dong, J, Tan, Z, Xiao, Y and Tu, J 2017, 'Seasonal changing effect on airflow and pollutant dispersion characteristics in urban street canyons', Atmosphere, vol. 8, no. 3, 43, pp. 1-18.


Document type: Journal Article
Collection: Journal Articles

Attached Files
Name Description MIMEType Size
n2006077051.pdf Published Version application/pdf 2.54MB
Title Seasonal changing effect on airflow and pollutant dispersion characteristics in urban street canyons
Author(s) Dong, J
Tan, Z
Xiao, Y
Tu, J
Year 2017
Journal name Atmosphere
Volume number 8
Issue number 3
Article Number 43
Start page 1
End page 18
Total pages 18
Publisher M D P I AG
Abstract In this study, the effect of seasonal variation on air flow and pollutant dispersion characteristics was numerically investigated. A three-dimensional urban canopy model with unit aspect ratio (H/D = 1) was used to calculate surface temperature distribution in the street canyon. Four representative time events (1000 LST, 1300 LST, 1600 LST and 2000 LST) during typical clear summer and winter days were selected to examine the air flow diurnal variation. The results revealed the seasonal variation significantly altered the street canyon microclimate. Compared with the street canyon surface temperature distribution in summer, the winter case showed a more evenly distributed surface temperature. In addition, the summer case showed greater daily temperature fluctuation than that of the winter case. Consequently, distinct pollutant dispersion patterns were observed between summer and winter scenarios, especially for the afternoon (1600 LST) and night (2000 LST) events. Among all studied time events, the pollutant removal performance of the morning (1000 LST) and the night (2000 LST) events were more sensitive to the seasonal variation. Lastly, limited natural ventilation performance was found during the summer morning and the winter night, which induced relatively high pollutant concentration along the pedestrian height level.
Subject Environmental Engineering Modelling
Keyword(s) Air flow
Natural ventilation
Pollutant dispersion
Pollutant removal
Seasonal variation
Street canyon
DOI - identifier 10.3390/atmos8030043
Copyright notice © 2017 by the Authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
ISSN 2073-4433
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 3 times in Scopus Article | Citations
Altmetric details:
Access Statistics: 65 Abstract Views, 6 File Downloads  -  Detailed Statistics
Created: Tue, 22 Aug 2017, 10:48:00 EST by Catalyst Administrator
© 2014 RMIT Research Repository • Powered by Fez SoftwareContact us