Record Display for the EPA National Library Catalog


Main Title Turbulence Parameters Impacting Dispersion in an Urban Convective Boundary Layer.
Author Godowitch, J. M. ; Ching, J. K. S. ;
CORP Author Environmental Sciences Research Lab., Research Triangle Park, NC.
Year Published 1984
Report Number EPA/600/D-84/255;
Stock Number PB85-116036
Additional Subjects Urban areas ; Boundary layer flow ; Air pollution ; Comparison ; Wind velocity ; Aerial surveys ; Regional air pollution study ; Saint Louis(Missouri)
Library Call Number Additional Info Location Last
NTIS  PB85-116036 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 16p
Turbulence measurements of the three dimensional wind components were collected by an instrumented research aircraft on 7 days in August 1976. These aircraft flights were conducted as part of the Regional Air Pollution Study (RAPS) urban boundary layer field program in St. Louis, Missouri. The focus of this research was to determine the magnitude and variation of characteristics of vertical velocity fluctuations in the afternoon convective boundary layer from data obtained at 150 m above ground. The vertical velocity time series for 22.5 km length segments were evaluated to obtain quantitative information on upward and downward turbulent motions in the urban convective boundary layer. Results of analysis revealed that vertical velocity distributions for both urban and nonurban segments displayed positive skewness and negative mode. In addition, the results of comparisons of the size of the largest updraft, convective boundary layer height, and the vertical velocity spectral peak wavelength are presented.