Pollutant Dispersion in the Atmosphere: A Solution Considering Nonlocal Closure of Turbulent Diffusion

A special attention has been given to the issue of searching analytical solutions for the advection-diffusion equation in order to simulate the pollutant dispersion in the Atmospheric Boundary Layer (ABL). In this work we take a step forward assuming a transient three-dimensional problem with nonlocal closure of the turbulent diffusion. The problem of closing the turbulence in the advection-diffusion equation is modified considering a generic equation for the turbulent diffusion. The countergradient term in the turbulence closure made additional terms to appear in the advection-diffusion equation and these terms are related to the asymmetrical transport in the convective boundary layer. This new equation is solved by the 3D-GILTT method. Numerical results and statistical comparisons with experimental data are presented.