Abstract
An atmospheric transport and deposition model is presented for pollutants emitted from an elevated point source over flat terrain. The model is obtained from the analytic solution of the atmospheric diffusion equation with the coefficients of eddy diffusion taken to be functions of downwind distance and the average wind velocity taken to be constant. Ground deposition of the pollutants is accounted for by 1. (1) including a gravitational settling term in the atmospheric diffusion equation and by 2. (2) applying an absorptive boundary condition at the ground surface. In order to facilitate application of the model, the results for the general situation that includes settling and deposition (and where the distribution is no longer Gaussian) are expressed in terms of the Grassian plume parameters, and specifically the crosswind and vertical standard deviation functions σ y ( x) and σ z ( x) Graphs of the pollutant air concentration and ground deposition flux are presented for a number of deposition conditions.
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