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Main Title Laboratory and numerical simulation of plume dispersion in stably stratified flow over complex terrain /
Author Lin, Jung-Tai. ; Liu, Hsien-Ta ; Pao, Yih-Ho ; Lilly, Douglas K. ; Israeli., Moshi
Other Authors
Author Title of a Work
Liu, Hsien-Ta.
Pao, Yih-Ho.
CORP Author Flow Research, Inc., Kent, Wash.;National Environmental Research Center, Research Triangle Park, N.C. Meteorology Lab.
Publisher U.S. Environmental Protection Agency, Environmental Sciences Research Laboratory,
Year Published 1974
Report Number EPA-650/4-74/044; Flow Res-29; Flow Res-30; EPA-68-02-0800; EPA-ROAP-21ADO
Stock Number PB-254 232
OCLC Number 655302568
Subjects Atmospheric diffusion--Mathematical models ; Atmospheric turbulence--Mathematical models ; Air--Pollution--Utah--Measurement ; Atmospheric circulation--Mathematical models
Additional Subjects Plumes ; Atmospheric diffusion ; Air pollution ; Terrain models ; Environment simulation ; Concentration(Composition) ; Field tests ; Froude number ; Numerical analysis ; Stratification ; Mathematical models ; Laboratory design
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EKBD  EPA-650/4-74-044 Research Triangle Park Library/RTP, NC 02/07/2011
NTIS  PB-254 232 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation vi, [75] in var. pagings : ill., charts ; 28 cm.
Laboratory investigations were conducted in a stably stratified towing tank to investigate the effects of stability and terrain on plume dispersion under extreme atmospheric conditions. A three dimensional idealized model hill (Gaussian shaped saddle) at a scale of 1:2500 was towed through the tank to simulate flow over complex terrain. With reference to plume dispersion over flat terrain, the complex terrain effects revealed from visualization results are (1) the plume rise and spread increases as a result of the reduction of local flow speed-the upstream blocking phenomenon; (2) the plume tends to flow around rather than over the hill, which greatly enhances the lateral spread; (3) pollutants accumulate in the semi-stagnant region immediately upstream and below the ridge line; and (4) downstream of the ridge, pollutants carried over and around the model remain aloft for small Froude number but are carried downward along the lee surface as the Froude number increases. Some quantitative measurements were made as well. A feasibility study of numerical simulation of plume dispersion in stably stratified flow over complex terrain was also conducted. It is shown that a small Froude number expansion technique may be useful for modeling single source diffusion problems when the source lies below the mountain tops. Several methods are discussed for the imposition of radiation boundary conditions in numerical calculations.
EPA project officer: William H. Snyder. Prepared by Flow Research, Inc. "November 1974." Includes bibliographical references (p. 19-20) "EPA-650/4-74-044."