||Initial Test of the Applicability of Invariant Modeling Methods to Atmospheric Boundary Layer Diffusion.
Donaldso, Coleman duP. ;
Hils, Glenn R. ;
||Aeronautical Research Associates of Princeton, Inc., N.J.
||ARAP-169; EPA-68-02-0014; 1149;
( Air pollution ;
Atmospheric diffusion) ;
Mathematical models ;
Turbulent diffusion ;
Shear stress ;
Atmospheric boundary layer
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
The study concerned the movement of air pollution in the atmosphere. With only prior knowledge of the mean wind and temperature profiles and using a relationship between the macroscale and the dissipation scale derived for laboratory scale flow, the structure of turbulence and the diffusion of matter were simulated well within an order of magnitude of observed values. In most cases, the verification is within a factor of two. Perhaps most importantly all of the classical requirements for asymptotic behavior of the diffusion were met. The predictions were somewhat more exact for neutral and unstable temperature stratification than for stably stratified atmospheres. A greater understanding of the physics of turbulent transport has been achieved and has led directly to further improvement and refinement of the model. The dependence of the scale on stability has been clarified.