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Open AccessArticle

Seasonal Changing Effect on Airflow and Pollutant Dispersion Characteristics in Urban Street Canyons

1
College of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400030, China
2
School of Engineering, RMIT University, Bundoora, VIC 3083, Australia
3
School of Civil Engineering, Chang’an University, Chang’an 710064, China
*
Author to whom correspondence should be addressed.
Academic Editors: Riccardo Buccolieri and Jian Hang
Atmosphere 2017, 8(3), 43; https://doi.org/10.3390/atmos8030043
Received: 8 January 2017 / Revised: 17 February 2017 / Accepted: 17 February 2017 / Published: 23 February 2017
(This article belongs to the Special Issue Recent Advances in Urban Ventilation Assessment and Flow Modelling)
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. View Full-Text
Keywords: street canyon; seasonal variation; air flow; pollutant dispersion; pollutant removal; natural ventilation street canyon; seasonal variation; air flow; pollutant dispersion; pollutant removal; natural ventilation
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MDPI and ACS Style

Dong, J.; Tan, Z.; Xiao, Y.; Tu, J. Seasonal Changing Effect on Airflow and Pollutant Dispersion Characteristics in Urban Street Canyons. Atmosphere 2017, 8, 43.

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