Simulation of the Dispersion of Pollutants Considering Nonlocal Effects in the Solution of the Advection-Diffusion Equation.

A way to solve the problem of closing the advection-diffusion equation is based on the transport hypothesis by gradient that, in analogy with molecular diffusion, assumes that the turbulent flux of concentration is proportional to the magnitude of the gradient of medium concentration. This work differs from the traditional method; a generic equation is used for the turbulent diffusion being considered that the flux more yours derived is proportional to the medium gradient. This way, an equation is obtained that takes into account the asymmetry in the process of dispersion of atmospheric pollutants. Therefore, the proposal of this work is to obtain an analytic solution of this new equation using the Laplace Transform technique, considering the Convective Boundary Layer (CBL) as a multilayer system. To investigate the influence of the nonlocal effects in the turbulent dispersion process, the model is evaluated against atmospheric dispersion experiments that were carried out in Copenhagen under unstable conditions. [ABSTRACT FROM AUTHOR]