Multiple-source gaussian dispersion model for air pollution
1995
Bentillo, I.G.
An air pollution dispersion model was developed using the Gaussian plume equation, where the lateral and vertical dispersion coefficient for different atmospheric stabilities were computed from equations fitted to Pasquill-Gifford curves and corrected for changes in averaging times, roughness lengths, wind shear, and plume buoyancy. The plume rise was calculated by Brigg's equation using momentum and buoyancy fluxes and corrections for the effect of topography were made using Egan's Half-Height method. The model used a rectangular coordinate system and computed the pollutant concentrations and grid points by super-imposing the contributions of all sources. The model was used to simulate ground level dust concentrations resulting from dispersion of dust from 58 emission sources in a cement plant. The results are presented in the form of isolines of 1-hr average dust concentrations for different months of the year using observed winds and atmospheric stabilities. Comparing these results with observed values, it is seen that the model over-estimates actual ground level dust concentrations by a factor of two. The use of single-source models in simulating multiple-source dispersion typically overestimates actual values by a factor of five based on actual monitoring data. It is concluded that the present method is an improvement over the use of the single-source models in the simulation of multiple-source pollution problems
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