Record Display for the EPA National Library Catalog


Main Title A lagrangian approach to modelling air pollutant dispersion; Development and testing in the vicinity of a roadway.
Author Lamb, R. G.
Other Authors
Author Title of a Work
Hogo, H.
Reid, L.E.
CORP Author Systems Applications, Inc., San Rafael, CA.;Environmental Sciences Research Lab., Research Triangle Park, NC.
Publisher EPA,
Year Published 1979
Report Number EPA-600/4-79-023; EPA-68-02-2733
Stock Number PB-296 095
OCLC Number 28747807
Additional Subjects Air pollution ; Atmospheric diffusion ; Roads ; Air flow ; Sulfur hexafluoride ; Mathematical models ; Performance evaluation ; Computer programming ; Fortran ; Atmospheric dispersion ; Lagrange coordinates ; Nonpoint sources ; Two dimensional calculations ; Fortran 4 programming language
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA 600/4-79-023 c.1 Headquarters Library/Washington,DC 04/14/2014
EKBD  EPA-600/4-79-023 Research Triangle Park Library/RTP, NC 08/22/2003
ELBD ARCHIVE EPA 600/4-79-023 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ERAD  EPA 600/4-79-023 Region 9 Library/San Francisco,CA 10/29/2012
ESAD  EPA 600-4-79-023 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-296 095 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation viii, 115 p., 28 cm.
A microscale roadway dispersion model based on Lagrangian diffusion theory has been developed and tested. The model incorporates similarity expressions for the mean wind and turbulence energy in the atmospheric boundary layer, through which the effects of wind shear and atmospheric stability are taken into account, and a parameterization of vehicle wake turbulence. Through simple modifications, the model can be structed to treat particle settling, deposition, and resuspension, as well as buoyancy of the effluent material. Calm winds, winds parallel to the roadway, flows around depressed or elevated roadways, shallow mixed layers, and transient of spatially variable meteorological conditions can all be explicity taken into account within the framework of the modeling approach. The model was tested by applying it to the 30-minute experimental periods reported in the General Motors sulfate study. Of the 1040 predicted values of the mean concentration of an inert material (SF6), half were found to be within +30 percent of the measured values. The overall correlation coefficient was 0.91. The computer time (but not core storage) required by the model is directly proportional to the distance between the farthest receptor and the road. For the studies reported the model requires on the average 20 seconds of CPU time on the CDC 7600 to simulate each of the 30-minute General Motors experiments.
EPA 600/4-79-023. April, 1979.