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Titre :
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Capability of convection-dispersion transport models to predict transient water and solute movement in undisturbed soil columns
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Auteurs :
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T. Zurmuhl
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Type de document :
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article/chapitre/communication
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Année de publication :
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1998
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Format :
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p. 101-128
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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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TRANSPORT DE CONTAMINANT
;
DISPERSION
;
CONVECTION
;
MILIEU POREUX
;
TRACEUR
;
SOL
;
CARACTERISTIQUE HYDRODYNAMIQUE
;
MODELE
;
SORPTION
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Résumé :
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The capability of the convection-dispersion model coupled with the Richards equation to predict transient transport of water and solutes in porous media is studied in a laboratory soil column. The solutes used are (H2O)-H-3 as a conservative tracer and C-14-labeled dibutylphthalate (DBP) as a sorbing solute. To account for multiple nonideal transport processes, a model was developed that may consider hysteresis of the water retention curve, sorption nonequilibrium (sorption kinetics and sorption hysteresis) and mobile and immobile water domains during solute transport. The model parameters were determined independently from the transient experiments, but on the same soil column to avoid uncertainty in transferring results from one sample to another. The hydraulic properties of the soil column were estimated by a multistep outflow experiment using inverse modeling. Transport parameters were estimated form breakthrough curves of (H2O)-H-3 measured under steady-state flow conditions.
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Source :
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Journal of contaminant hydrology, vol.30
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