Record Display for the EPA National Library Catalog

RECORD NUMBER: 40 OF 42

OLS Field Name OLS Field Data
Main Title Vertical Dispersion from Surface and Elevated Releases: An Investigation of a Non-Gaussian Plume Model.
Author Brown, M. J. ; Arya, S. P. ; Snyder, W. H. ;
CORP Author North Carolina State Univ. at Raleigh. Dept. of Marine, Earth and Atmospheric Sciences.;National Oceanic and Atmospheric Administration, Research Triangle Park, NC. Atmospheric Sciences Modeling Div.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher c1993
Year Published 1993
Report Number EPA/600/J-93/267;
Stock Number PB93-212736
Additional Subjects Boundary layer flow ; Pollution transport ; Vertical motion ; Dispersing ; Plumes ; Mathematical models ; Atmospheric circulation ; Air pollution ; Turbulent diffusion ; Wind tunnels ; Rural areas ; Non-Gaussian plume model
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB93-212736 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 11/22/1993
Collation 18p
Abstract
The vertical diffusion of a passive tracer released from surface and elevated sources in a neutrally-stratified boundary layer has been studied by comparing field and laboratory experiments with a non-Gaussian K-theory model that assumes power-law profiles for the mean velocity and vertical eddy diffusivity. Several important differences between model predictions and experimental data were discovered: (1) the model overestimated ground-level concentrations from surface and elevated releases at distances beyond the peak concentrations; (2) the model overpredicted vertical mixing near elevated sources, especially in the upward direction; (3) the model-predicted exponent in the exponential vertical concentration profile for a surface release was smaller than the experimentally measured exponent. Model closure assumptions and experimental shortcomings were examined in order to account for the differences.