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Sorbing and non-sorbing solute migration in rough fractures with a multi-species LGA model: Dispersion dependence on retardation and roughness


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Titre de la revue : Transport in Porous Media Volume : 59 N° : 2 Pagination : 175-196 Date de publication : 01/05/2005

Type de document > *Article de revue

Mots clés >

Unité de recherche > IRSN/DSU

Auteurs > GENTY Alain, POT V.

Date de publication > 01/05/2005

Résumé

A multi-species Lattice-Gas cellular automaton model was applied to the study of the migration of sorbing and non-sorbing tracers in 2D smooth fractures and in a series of increasing roughness fractures. A tenfold increase of the dispersion of the non-sorbing tracer was calculated in the highest roughness case compared to the smooth fracture. Up to a threefold increase of the dispersion of the sorbing tracers was calculated compared to the non-sorbing tracer. These enhanced dispersions were found to be of a Fickian form and were interpreted in terms of the classical Taylor–Aris dispersion. The effects of roughness and retardation over the increase of dispersion were identified and quantified through a semi-empirical relation. These effects were found additive and independent.

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