Record Display for the EPA National Library Catalog


Main Title Highway Model for the Advection, Diffusion and Chemical Reaction of Pollutants Released by Automobiles: Part I. Advection and Diffusion of SF6 Tracer Gas.
Author Eskridge, Robert E. ; Demerjian., Kenneth L. ;
CORP Author Environmental Sciences Research Lab., Research Triangle Park, N.C.
Year Published 1977
Report Number EPA/600/J-77-118;
Stock Number PB-280 788
Additional Subjects Air pollution ; Mathematical models ; Automobiles ; Exhaust gases ; Atmospheric diffusion ; Chemical reactions ; Highways ; Concentration(Composition) ; Advection ; Numerical analysis ; Algorithms ; Comparison ; Sulfur hexafluoride ; Reprints ; Tracer studies ; Nonpoint sources ; Automobile exhaust
Library Call Number Additional Info Location Last
NTIS  PB-280 788 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
A two-dimensional, finite-difference model simulating a highway has been developed which is able to handle linear and nonlinear chemical reactions. Transport of the pollutants is accomplished by use of an upstream-flux-corrected algorithm developed at the Naval Research Laboratories. This algorithm insures positive concentrations and reduces numerical diffusion. The model develops background eddy diffusion coefficients which are then perturbed by the mechanical turbulence introduced by vehicular motion. The model calculations are compared to the SF6 experiments carried out by General Motors in the GM sulfate dispersion experiment. Model predictions are compared to observations at each of the twenty observation points for all the experiments. The observations and predictions are correlated for each half hour period, and scatter diagrams presented. A discussion of the results and additional statistical comparisons is also included.