MATHEMATICAL MODEL FOR AN AREA SOURCE AND THE POINT SOURCE IN AN URBAN AREA

Pandurangappa. C, Lakshminarayanachari K

Abstract: A Mathematical model has been developed to study the dispersion of pollutants emitted from an area source and the point source on the boundary in an urban area. The mathematical model has been solved numerically by using the implicit Crank-Nicolson finite difference method. The results of this model have been analysed for the dispersion of air pollutants in the urban area downwind and vertical direction for stable and neutral conditions of the atmosphere in the presence of mesoscale wind. The concentration of pollutants is less in the upwind side of the centre of heat island and more in the downwind side of the centre of heat island in the case of mesoscale wind when compared to without mesoscale wind. In the case of stable atmospheric condition, the maximum concentration of pollutants is observed at the ground surface and near the point source on the boundary. Same phenomenon is observed in neutral atmospheric condition but the magnitude of concentration of pollutants in the neutral atmospheric condition is comparatively less than that of the stable atmospheric condition.

Keywords: Point Source, Area Source, Mesoscale wind

DOI: https://doi.org/10.15623/ijret.2012.0101004