A NUMERICAL-MODEL FOR DISPERSION IN A CONVECTIVE BOUNDARY-LAYER

A numerical model based on the convective plumes observed in the conve cting planetary boundary layer has been developed for material dispers ion from both elevated and ground source releases. Mechanistic formula tion, rather than parameterization, or statistical behavior of PBL phe nomenon, has been used as a basis. This model uses two universal const ants, the turbulent entrainment constant, a, and decay constant, A. Th e model results have physical significance with regard to the observed plume behavior in a convective field. An observed case of diffusion h as been simulated. The model results are in reasonable agreement with the observation without introducing any adjustable parameters to impro ve the fit.