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

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

2008-12-08

arxiv.org/abs/0812.1436v2

Phys. Rev. E 79, 041125 (2009)

Physics

Condensed Matter

Statistical Mechanics

8 pages, 9 figures

Scientific paper

10.1103/PhysRevE.79.041125

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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