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Published on: November 25, 2020
Nonlinear random-walk approach to concentration-dependent contaminant transport in porous media
Andrea Zoia1, Christelle Latrille, Alain Cartalade
1CEA/Saclay, DEN/DM2S/SFME/LSET, Bât. 454, 91191 Gif-sur-Yvette Cedex, France. andrea.zoia@cea.fr
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.
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