期刊
ATMOSPHERIC ENVIRONMENT
卷 104, 期 -, 页码 217-227出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2015.01.027
关键词
Street canyon; Street temperature; Diurnal variation; Pollutant dispersion
资金
- Australia Research Council [LP110100140]
- Natural Science Foundation of China [21277080]
- Chongqing Postdoctoral Research Project [Xm201331]
- China Scholarship Council (CSC) [201306050040]
- Australian Research Council [LP110100140] Funding Source: Australian Research Council
The impacts of the diurnal variation of surface temperature on street canyon flow pattern and pollutant dispersion are investigated based on a two-dimensional street canyon model under different thermal stratifications. Uneven distributed street temperature conditions and a user-defined wall function representing the heat transfer between the air and the street canyon are integrated into the current numerical model. The prediction accuracy of this model is successfully validated against a published wind tunnel experiment. Then, a series of numerical simulations representing four time scenarios (Morning, Afternoon, Noon and Night) are performed at different Bulk Richardson number (Rb). The results demonstrate that uneven distributed street temperature conditions significantly alters street canyon flow structure and pollutant dispersion characteristics compared with conventional uniform street temperature assumption, especially for the morning event. Moreover, air flow patterns and pollutant dispersion are greatly influenced by diurnal variation of surface temperature under unstable stratification conditions. Furthermore, the residual pollutant in near-ground-zone decreases as Rb increases in noon, afternoon and night events under all studied stability conditions. (C) 2015 Elsevier Ltd. All rights reserved.
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