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IRSN, Institut de radioprotection et de sûreté nucléaire

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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


Journal title : Transport in Porous Media
Volume : 59
Issue : 2
Publication date : 01/05/2005

Document type > *Article de revue

Keywords >

Research Unit > IRSN/DSU

Authors > GENTY Alain, POT V.

Publication Date > 01/05/2005

Summary

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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