Record Display for the EPA National Library Catalog

RECORD NUMBER: 22 OF 76

OLS Field Name OLS Field Data
Main Title Experimental Study of Flow and Dispersion in the Wakes of Three-Dimensional Low Hills.
Author Arya, S. P. S. ; Gadiyaram, P. S. ;
CORP Author North Carolina State Univ. at Raleigh.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Year Published 1985
Report Number EPA/600/D-85/094;
Stock Number PB85-193266
Additional Subjects Boundary layer flow ; Wakes ; Aerodynamics ; Flow distribution ; Hills ; Air pollution ; Experimental design ; Wind tunnels ; Rural area ; Turbulent flow ; Mathematical models ; Atmospheric dispersion
Holdings
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Status
NTIS  PB85-193266 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 49p
Abstract
The EPA Meteorological Wind Tunnel was used to simulate a rural atmospheric boundary layer. Experiments were conducted on flow and dispersion over three-dimensional, conical hills of two different slopes (26.5 degrees and 17.5 degrees) whose heights were 1/3 of the boundary layer depth. These measurements were made both in undisturbed and disturbed (in presence of hill) flows, using hot-wire anemometers and hydrocarbon analyzers. Enhanced vertical and lateral dispersion were evident in the immediate wake region of the hill. This phenomenon reflects the increased turbulence levels in the wake. The results of this study clearly illustrate that the slope of a conical hill is a most important parameter; it determines the location of flow separation, the size of the cavity region, and the characteristics of the wake flow dispersion.