Titre :
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Mass transfert in soils with local stratification of hydraulic conductivity
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Auteurs :
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L. Barry ;
P. Culligan Hensley ;
K. Bajracharya
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Type de document :
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article/chapitre/communication
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Editeur :
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Washington [USA] : AGU, 1994
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Format :
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p. 2891-2900
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Langues:
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= Anglais
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Mots-clés:
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TRANSFERT DE MASSE
;
CONDUCTIVITE HYDRAULIQUE
;
SOL
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Résumé :
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The two-region model was developed originally to describe nonsorbing chemical transport in soils with dead-end pores based on the concept of mobile and immobile regions in the soil, it has been shown that the model can simulate solute transport in soils with local stratification, or inhomogeneity, of hydraulic conductivity. However, the physical basis of the model becomes questionable, since the mobile-immobile region concept does not apply in stratified soils. In both soil types the nonequilibrium effect is caused by an apparent mass transfer process within the soil, as distinct from advection and diffusion. Where there are immobile regions, the mass transfer is due to solute interregion diffusion alone. In stratified soils the nonequilibrium mass transfer process is affected also by local flow variations. A conceptual model, numerical simulations, and laboratory experiments are presented to analyze these effects.
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Source :
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Water Resources Research, vol. 30, no 11, novembre 1994
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