A closed form solution for pollutant dispersion in atmosphere considering nonlocal closure of the turbulent diffusion

摘要

Atmospheric air pollution turbulent fluxes can be assumed proportional to the mean concentration gradient. This assumption, along with the equation of continuity, leads to the advection-diffusion equation. Moreover, large eddies are able to mix scalar quantities in a manner that is counter to the local gradient. In this work we present an analytical solution of the three-dimensional steady state advection-diffusion equation, considering nonlocal turbulence closure using the Integral Transform Technique (GILTT). Numerical results and statistical comparisons with experimental data are presented.