Titre :
|
Transport in chemically and mechanically heterogeneous porous media. V. Two-equation model for solute transport with adsorption
|
Auteurs :
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A. Ahmadi ;
M. Quintard ;
S. Whitaker
|
Type de document :
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article/chapitre/communication
|
Année de publication :
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1998
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Format :
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p. 59-86
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Langues:
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= Anglais
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Catégories :
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HYDROLOGIE ET HYDRAULIQUE
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Mots-clés:
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MILIEU POREUX
;
ECOULEMENT EN MILIEU POREUX
;
HYDRODYNAMIQUE
;
SOLUTE
;
ADSORPTION
;
MODELE MATHEMATIQUE
|
Résumé :
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In this paper we develop the two-equation model for solute transport and adsorption in a two-region model of a mechanically and chemically heterogeneous porous medium. The closure problem is derived and the coefficients in both the one- and two-equation models are determined on the basis of the Darcy-scale parameters. Numerical experiments are carried out for a stratified system at the aquifer scale, and the results are compared with the one-equation model presented in Part IV and the two-equation model developed in this paper. Good agreement between the two-equation model and the numerical experiments is obtained. In addition, the two-equation model is used, in conjunction with a moment analysis, to derive a one-equation, non-equilibrium model that is valid in the asymptotic regime. Numerical results are used to identify the asymptotic regime for the one-equation, non-equilibrium model.
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Source :
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Advances in Water Resources, vol.22, n°1
|