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Main Title Flow structure and turbulent diffusion around a three-dimensional hill : fluid modeling study on effects of stratification. pt. 1, Flow structure /
Author Hunt, Julian C. R.,
Other Authors
Author Title of a Work
Snyder, William H.
Lawson, Robert E.
CORP Author Cambridge Univ. (England). Dept. of Applied Mathematics and Theoretical Physics. ;Northrop Services, Inc., Research Triangle Park, NC.;Environmental Sciences Research Lab., Research Triangle Park, NC.
Publisher Environmental Protection Agency, Office of Research and Development, Environmental Sciences Research Laboratory, For sale by the National Technical Information Service.
Year Published 1978
Report Number EPA-600/4-78-041
Stock Number 22161
OCLC Number 04816248
ISBN pbk.
Subjects Air--Pollution. ; Stratified flow.
Additional Subjects Atmospheric diffusion ; Turbulent diffusion ; Hills ; Air pollution ; Wind tunnel models ; Stratification ; Flow distribution ; Wind(Meteorology) ; Froude number ; Air flow ; Terrain models ; Atmospheric motion ; Plumes ; Three dimensional geometry ; Lee waves ; Wind tunnel tests ; Flow geometry
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 600-4-78-041 c.1 Headquarters Library/Washington,DC 11/16/2012
EJBD  EPA 600/4-78-041 Headquarters Library/Washington,DC 02/24/2006
EKBD  EPA-600/4-78-041 Research Triangle Park Library/RTP, NC 02/22/2011
NTIS  PB-287 101 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation xii, 84 pages : illustrations ; 28 cm.
This research program was initiated with the overall objective of gaining understanding of the flow and diffusion of pollutants in complex terrain under both neutral and stably stratified conditions. This report covers the first phase of the project; it describes the flow structure observed over a bell shaped hill (polynomial in cross section) through neutral wind tunnel studies and stably stratified towing tank studies. It verifies and establishes the limits of applicability of Drazin's theory for flow over three-dimensional hills under conditions of small Froude number. At larger Froude number a theory is developed, and largely verified, to classify the types of lee wave patterns and separated flow regions and to predict the conditions under which they will be formed. Flow visualization techniques are used extensively in obtaining both qualitative and quantitative information on the flow structure around the hill. Representative photographs of dye tracers, potassium permanganate, dye streaks, shadowgraphs, surface dye smears, and hydrogen bubble patterns are included. While emphasis centered on obtaining basic understanding of flow around complex terrain, the results are of immediate applicability by air pollution control agencies. In particular, the location of the surface impingement point from an upwind pollutant source can be identified under a wide range of atmospheric conditions. Part II, to be printed as a separate report, will describe the concentration field over the hill resulting from plumes released from upwind stacks and will further quantify the results obtained in Part I.
"July 1978." "Part II, to be printed as a separate report ... will further quantify the results obtained in Part I"--Page iii. Includes bibliographical references (pages 42-44).
Contents Notes
pt. 1. Flow structure.