Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Estimating Plume Dispersion, A Recommended Generalized Scheme.
Author Irwin, John S. ;
CORP Author Environmental Sciences Research Lab., Research Triangle Park, NC.
Year Published 1979
Report Number EPA/600/J-79/022;
Stock Number PB-299 405
Additional Subjects Air pollution ; Mathematical models ; Plumes ; Turbulent flow ; Wind velocity ; Stability ; Reprints ; Atmospheric dispersion ; Gaussian plume models
Library Call Number Additional Info Location Last
NTIS  PB-299 405 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 10p
A generalized scheme is presented for estimating the vertical and horizontal Gaussian dispersion parameters for point sources whose release heights are greater than 10 meters. The scheme requires either estimates of or measurements of the standard deviation of the horizontal and vertical wind direction fluctuations at the effective height of release. During unstable conditions, the depth of the convectively mixed layer and the convective velocity scale are required as input to the scheme. During neutral/stable conditions, the scheme requires specification of the depth of surface based neutral/stable layer. Provisions are made for incorporating the induced dispersion resulting from buoyant plume rise and from horizontal wind direction shear in the vertical. No provisions are made for dispersion induced due to terrain interaction with the transport of the plume. The scheme incorporates the recommendations of the AMS workshop on stability classification schemes and sigma curves and is suggested for use in the interim while more field data is collected upon which a more complete scheme can be based.