Transverse effective dispersion coefficients in a chemically heterogeneous medium with flow fluctuations

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Title:	Transverse effective dispersion coefficients in a chemically heterogeneous medium with flow fluctuations
Author:	Zavala Sánchez, Gabriela V.; Dentz, Marco; Sánchez Vila, Francisco Javier
Other authors:	Universitat Politècnica de Catalunya. Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica; Universitat Politècnica de Catalunya. GHS - Grup d'Hidrologia Subterrània
Abstract:	We investigate the effective transport of a sorptive solute through a chemically heterogeneous medium subject to temporal fluctuations of the flow conditions. We focus on linear instantaneous sorption, with a spatially variable retardation factor. The medium is physically homogeneous. The temporal variability of the flow is represented by a stationary random process. In this stochastic modelling framework, solute spreading is quantified by effective dispersion coefficients. Focusing on the transverse contributions due to chemical heterogeneity and temporal fluctuations, we find enhanced transverse spreading characterized by a transverse effective dispersion coefficient that, in contrast to transport in steady state flow, evolves to a disorder-induced macroscopic value independent of local dispersion.
Abstract:	Peer Reviewed
Subject(s):	-Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia subterrània -Groundwater flow -- Chemometrics -Aigües subterrànies -- Fluxe -- Models matemàtics
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Document type:	Article - Draft Conference Object
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