title: Nonlinear random-walk approach to concentration-dependent contaminant transport in porous media.
abstract: We propose a nonlinear random-walk model to describe the dynamics of dense contaminant plumes in porous media. A coupling between concentration and velocity fields is found so that transport displays non-Fickian features. The qualitative behavior of the pollutant spatial profiles and moments is explored with the help of Monte Carlo simulation, within a continuous-time random-walk approach. Model outcomes are then compared with experimental measurements of variable-density contaminant transport in homogeneous and saturated vertical columns.
authors.affiliation: CEA/Saclay, DEN/DM2S/SFME/LSET, Bât. 454, 91191 Gif-sur-Yvette Cedex, France. andrea.zoia@cea.fr
authors.forename: Andrea
authors.initials: A
authors.lastname: Zoia
authors.forename: Christelle
authors.initials: C
authors.lastname: Latrille
authors.forename: Alain
authors.initials: A
authors.lastname: Cartalade