Sensitivity to diffusivity and velocity transversal distributions on solute dispersion in wide channels [Dispersione di soluti in alveo largo Influenza delle distribuzione trasversali di diffusività e di velocità]

Using a 2-D simulation model, the spreading of a passive solute is investigated varying the transversal distribution assumed for the diffusion coefficient and the velocity. Using strongly different laws, the simulation results show a larger influence on the dispersion process by the velocity distribution, while the influence of the diffusion coefficient diffusion is very small, so that it is important just to catch the average value for this coefficient. Different transversal distribution of velocity produce values of maximum concentration with a scatter in the 30-40% range.