On the Turbulent Diffusion in the Ground Air Layer,
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1969
- Accession Number
- AD0859579
Entities
People
- D. Yordanov
Organizations
- National Air and Space Intelligence Center