Scientific and technological production
Characterization of mixing and spreading in heterogeneous media
Zavala Sanchez, Gabriela V.
Defense's date: 2008-07-02
Department of Geotechnical Engineering and Geo-Sciences, Universitat Politècnica de Catalunya
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Effective dispersion in a chemically heterogeneous medium under temporally fluctuating flow conditions
Characterization of mixing and spreading in a bounded stratified medium
Transverse effective dispersion coefficients in a chemically heterogeneous medium with flow fluctuations
Zavala Sanchez, Gabriela V.; Dentz, Marco; Sanchez Vila, Francisco Javier
Groundwater Symposium on Groundwater Hydraulics in complex environments
Presentation's date: 2006-06
Presentation of work at congresses
Read the abstract Access to the full text Share Reference managersWe 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.
Effective dispersion coefficients in temporally fluctuating flow through a chemically