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INVESTIGATION OF PHOTOCHEMICAL MODELING OF POINT SOURCE POLLUTANTS WITH EULERIAN GRID AND LAGRANGIAN PLUME APPROACHES
Citation:
Godowitch, J. INVESTIGATION OF PHOTOCHEMICAL MODELING OF POINT SOURCE POLLUTANTS WITH EULERIAN GRID AND LAGRANGIAN PLUME APPROACHES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-95/128 (NTIS PB96116892).
Description:
In this paper, results of Eulerian grid and Lagrangian photochemical model simulations of emissions from a major elevated point source are presented. eries of simulations with grid sizes varying from 30 km to 2 km were performed with the Urban Airshed Model, a photochemical grid model, in order to examine the capability of the model to resolve plume features and to emulate the chemical evolution of the pollutant plume. ifferences in pollutant concentrations with emphasis on O3 for various grid sizes are highlighted. he grid model simulation results are compared to O3 concentrations generated from a Lagrangian reactive plume model (RPM). oth models were applied to treat the transport, dispersion, and photochemical processes impacting a pollutant plume. n order to promote the comparison and interpretation of the model results, meteorological inputs for the Lagrangian plume model were provided through an interface program using the input data sets employed to drive the grid model. esults indicated that the grid model was able to replicate the evolution of ozone in the pollutant plume for this rather large emissions source at the finest grid resolution. s anticipated, simulation results for different grid cell sizes also revealed the maximum O3 occurred further downwind as the model grid size was decreased, and the peak ozone level was lowest for the coarsest grid size (30 km). nterestingly, maximum O3 values were on a downward trend for the selected smaller grid cell sizes for the large emissions source strength employed in this study. omparison between the modeling approaches indicated the maximum ozone generated from the RPM approach was lower than peak values from the grid model simulations.