Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Estimated Effective Chimney Heights Based on Rawinsonde Observations at Selected Sites in the United States.
Author Holzworth., George C. ;
CORP Author Environmental Sciences Research Lab., Research Triangle Park, N.C.
Year Published 1977
Report Number EPA/600/J-78/010;
Stock Number PB-281 254
Additional Subjects Chimneys ; Air pollution ; Height finding ; Plumes ; Temperature ; Wind velocity ; Numerical analysis ; Transport properties ; Chemical reaction ; Atmospheric diffusion ; Reprints
Library Call Number Additional Info Location Last
NTIS  PB-281 254 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
The plume rise equations of Briggs (1975) for variable vertical profiles of temperature and wind speed are described and applied for hypothetical small and very large chimneys at five NWS rawinsonde stations across the United States. From other available data additional information on plume behavior is deduced. For example, based on the 0515 CST soundings at Nashville, 61% of the effective plume heights for 50-m chimneys were in a temperature inversion, but only 21% for 400-m chimneys. Ordinarily such plumes would be in a fanning configuration. Most of the plumes from large chimneys (60%) were above an inversion, probably in a lofting mode. Overall, 98% of the small plumes were reached by the afternoon mixing height, but only 85% of the large plumes were reached. Such information supports the obvious presumption that the effluent from large chimneys remains airborne longer than that from small chimneys, is transported over greater distances, and has more opportunity to undergo chemical transformations.