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A nonlinear random walk approach to concentration-dependent contaminant transport in porous media

Abstract : We propose a random walk model to describe the dynamics of dense contaminant plumes through porous media. A nonlinear 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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Andrea Zoia, Christelle Latrille, Alain Cartalade. A nonlinear random walk approach to concentration-dependent contaminant transport in porous media. Physical Review E , American Physical Society (APS), 2009, 79 (4), pp.041125. ⟨cea-02349243⟩

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