Record Display for the EPA National Library Catalog


Main Title Stack Heights and Locations in Complex Terrain.
Author Lawson, R. E. ; Snyder, W. H. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Year Published 1985
Report Number EPA/600/D-85/200;
Stock Number PB86-102324
Additional Subjects Chimneys ; Terrain models ; Air pollution ; Experimental design ; Concentration(Composition) ; Boundary layers ; Mathematical models ; Wind tunnel ; Sources ; Electric power plants ; Combustion products ; Industrial wastes ; Plumes ;
Library Call Number Additional Info Location Last
NTIS  PB86-102324 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
Terrain amplification factors were measured for a variety of source positions (locations and heights) both upstream and downstream of two model hills, an axisymmetric hill and a two-dimensional ridge. The spatial variation of these terrain amplification factors was used to delineate the vertical and longitudinal extent of the areas where excess concentrations (terrain amplification factors greater than 1.0) occurred. For the axisymmetric hill, a region of 40% excess concentration was found to extend a maximum of 1.8 hill heights in the vertical, 14 hill heights upstream, and 10 hill heights downstream. For the two-dimensional ridge, this region of 40% excess concentration extended 2.2 hill heights in the vertical, 8 hill heights upstream, and 15 hill heights downstream. Maximum terrain amplification factors for both the axisymmetric hill and the two-dimensional ridge were found on the downstream side of the hills and had values of approximately 5.6 and 6.8 respectively.