Accession Number : AD0859579

Title :   On the Turbulent Diffusion in the Ground Air Layer,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH

Personal Author(s) : Yordanov, D.

Report Date : 30 JUN 1969

Pagination or Media Count : 22

Abstract : The Monin-Obukhov theory represented vertical diffusion in the atmospheric surface boundary layer as a two-layer problem and presented formulas for unstable and stable stratification. Monin, however, was the first to describe diffusion in stable stratification conditions by another method (using Laplacian transforms), demonstrating his derivation with an example of pollutants accumulated on the ground from a ground-based source. The present paper shows that with a wider interval the simple asymptotic formulas can be used to express vertical diffusion. Horizontal diffusion is calculated on the assumption that the distribution of concentrations along the x and y axes is Gaussian. The advantage ascribed to the proposed method over the Laykhtman method is that it takes account of down-wind diffusion. Its disadvantage is that its use requires assumption of some mean wind altitude constant.

Descriptors :   (*ATMOSPHERIC MOTION, DIFFUSION), TURBULENCE, BOUNDARY LAYER, BULGARIA.

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE