Journal Title
Title of Journal: Hydrogeol J
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Abbravation: Hydrogeology Journal
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Publisher
Springer-Verlag
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Authors: JinPing Gwo Philip M Jardine William Sanford
Publish Date: 2004/08/13
Volume: 13, Issue: 4, Pages: 565-583
Abstract
Advective mass transfer is a pore scale masstransfer process that affects fluid and solute movement between pore domains such as fracture and matrix in a structured porous medium Mechanistically similar to advection in the advectiondispersion of solutes in nonstructured porous medium it redistributes solutes by moving solute and solvent simultaneously between pore domains While there is much research on diffusive mass transfer that is often referred to as matrix diffusion there is a lack of information and study for advective mass transfer in the literature The objective of this research is to study the effects of advective mass transfer on fluid and solute movement between pore domains First field hydraulic measurements at a waste disposal site in fractured rock at Oak Ridge National Laboratory ORNL Tennessee USA are used to calibrate a fracturematrix twoporedomain groundwater flow model Latinhypercube sensitivity analysis suggests that the uncertainty of the calibrated model parameters is small and the calibrated flow model is nearly the optimal Fracture spacing thus obtained is used to calculate diffusive mass transfer coefficients The individual effects of advective and diffusive mass transfer on solute movement are then quantitatively evaluated The calculations indicate that pore structure conceptual models may significantly affect the role of advective mass transfer in field and porescale mass transfer In the particular ORNL field site and with a fracturematrix pore structure model contribution of advective mass transfer to solute mass movement is about three to eight orders of magnitude smaller than that of diffusive mass transferRésumé Le transfert advectif de masse est un processus de transfert de masse à l’échelle du pore qui affecte les mouvements du fluide et du soluté entre les différents domaines de pores tel les fractures et la matrice dans un milieu poreux structuré Mécaniquement similaire à l’advection dans le concept advectiondispersion de solutés dans les milieux non structurés ce transfert redistribue les solutés simultanément avec le fluide entre les différents domaines poreux Alors que de nombreuses recherches portent sur les transferts de masse par diffusion se référant généralement à une diffusion par la matrice il y a un grand manquement d’informations et d’études sur les transferts de masse par advection dans la littérature L’objectif de cette recherche est d’étudier l’effet du transfert advectif de masse de fluide et de soluté entre les différents domaines poreux Premièrement les mesures hydrauliques de terrain sur la décharge en milieu fracturé du laboratoire national d’Oak Ridge ORNL Tennessee USA sont utilisées pour calibrer un modèle hydrogéologique à double porosité fracturematrice L’analyse de sensibilité latinhypercube suggère que l’incertitude sur les paramètres du modèle est faible et que le calibrage est pratiquement optimal L’espace de fracture résultant permet de calculer les coefficients de transfert de masse par diffusion Les effets individuels de l’advection et de la diffusion sur les mouvements de solutés sont dés lors évalués Les calculs indiquent que le modèle conceptuel de la structure des pores peuvent significativement affectés le rôle du transfert advectif de masse à l’échelle du pore et du terrain Dans le cas du site de l’ORNL et avec un modèle structuré fracturematrice la contribution de l’advection au transfert de masse est de l’ordre de troishuitième du transfert de masse par diffusionLa transferencia de masa advectiva es un proceso de transferencia de masa en escala intersticial que afecta el movimiento de fluido y soluto entre ámbitos porosos tal como fractura y matriz en un medio estructurado poroso Este proceso mecánicamente similar a la advección en la dispersiónadvección de solutos de medios porosos no estructurados redistribuye los solutos mediante el movimiento simultáneo de soluto y solvente entre ámbitos porosos Mientras que existe bastante investigación en transferencia difusiva de masa que frecuentemente se conoce como difusión en matriz existe falta de información y estudio de transferencia advectiva de masa en la literatura El objetivo de esta investigación es estudiar los efectos de la transferencia advectiva de masa en el movimiento de fluido y soluto entre ámbitos porosos Primero se utilizaron mediciones hidráulicas de campo en un sitio de depósito de residuos en roca fracturada en el Laboratorio Nacional Oak Ridge ORNL Tennessee USA para calibrar un modelo de flujo de agua subterránea de ámbito de dos poros fracturamatriz Análisis de sensitividad hipercúbicolatino sugieren que la incertidumbre de los parámetros del modelo calibrado es pequeña y que el modelo de flujo calibrado es aproximadamente el óptimo El espaciamiento de fracturas así obtenido se utiliza para calcular los coeficientes de transferencia de masa difusiva Luego se evalúa cuantitativamente los efectos individuales de transferencia de masa advectiva y difusiva en el movimiento de soluto Los cálculos indican que los modelos conceptuales de estructura porosa pueden afectar significativamente el papel de transferencia de masa advectiva en escalas de campo e intersticial de transferencia de masa En el sitio de campo específico ORNL y con un modelo de estructura porosa de matrizfractura la contribución de transferencia de masa advectiva al movimiento de masa soluto es aproximadamente tres a ocho órdenes de magnitud más pequeño que la contribución por transferencia de masa difusivaThis research is supported by the Environmental Management and Science Program EMSP and was supported by the Environmental Technology Partnership ETP program of the Office of Biological and Environmental Research US Department of Energy US DOE The authors would like to thank Mark Gilberson and Paul Bayer contract officers for US DOE’s EMSP and ETP programs respectively for financial support The authors are also indebted to the National Energy Research Scientific Computing Center and the Center for Computational Sciences at Oak Ridge National Laboratory for making computational resources available to this research
Keywords:
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