Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30184
Three Dimensional Analysis of Pollution Dispersion in Street Canyon

Authors: T. Banerjee, R. A. Christian

Abstract:

Three dimensional simulations are carried out to estimate the effect of wind direction, wind speed and geometry on the flow and dispersion of vehicular pollutant in a street canyon. The pollutant sources are motor vehicles passing between the two buildings. Suitable emission factors for petrol and diesel vehicles at varying vehicle speed are used for the estimation of the rate of emission from the streets. The dispersion of automobile pollutant released from the street is simulated by introducing vehicular emission source term as a fixed-flux boundary condition at the ground level over the road. The emission source term is suitably calculated by adopting emission factors from literature for varying conditions of street traffic. It is observed that increase in wind angle disturbs the symmetric pattern of pollution distribution along the street length. The concentration increases in the far end of the street as compared to the near end.

Keywords: Street canyon, pollution dispersion, vehicular emission, numerical simulation.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1071238

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1358

References:


[1] J F Sini, A. Anquetin and P. G. Miestayer, Pollutant dispersion and thermal effects in urban street canyons, Atmospheric Environment, Vol.30, No. 15, pp. 2659-2677, 1996.
[2] X. X. Li., C. H. Liu, D. Y. C. Leung, K. M. Lam, Recent progress in CFD modelling of wind field and pollutant transport in street canyons, Atmospheric Environment, Vol. 40, pp. 5640-5658, 2006.
[3] M. Y. Tsai and K. S. Chen, Measurements and three-dimensional modeling of air pollutant dispersion in an urban street canyon, Vol. 38, pp. 5911-5924, 2004.
[4] G. Vachon., P. Louka, J. M. Rosant, P. G. Mestayer. And J. F. Sini, Measurements of traffic-induced turbulence within a street canyon during Nantes-99 Experiment, 3rd Urban Air Quality Conference Loutraki, 2000.
[5] K.Muralidhar and G. Biswas,), Advanced Engineering Fluid Mechanics, Narosa Publication, New Delhi, 1996.
[6] J. M. Crowther, A. Galeil and A. A.Hassan, Three-dimensional numerical simulation of air pollutant dispersion in strret canyon, Water, Air and Soil Pollution Focus2, pp. 279-295, 2002 .
[7] M. Idczk, P. Mesteyer, J M Rosant, J F. Sini, M. Violleau M., Micrometeorological measurements in a street canyon during the joint ATREUS-PICADA experiment, Boundary Layer Meteorol, Vol. 124, pp. 25-41, 2007.