Nonlinear random-walk approach to concentration-dependent contaminant transport in porous media.
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.
Zoia
Andrea
A
CEA/Saclay, DEN/DM2S/SFME/LSET, Bât. 454, 91191 Gif-sur-Yvette Cedex, France. andrea.zoia@cea.fr
Latrille
Christelle
C
Cartalade
Alain
A