On the importance of aqueous diffusion and electrostatic interactions in advection-dominated transport in saturated porous media

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    Abstract

    Diffusion and compound-specific mixing significantly affect conservative and reactive transport in groundwater. The variability of diffusion coefficients for different solutes has a relevant impact on their displacement at different scales, not only under diffusion-dominated regimes but also under advection-dominated flow through conditions. When the solutes are charged species, besides the magnitude of their aqueous diffusion coefficients also their electrostatic interactions play a significant role in the displacement of the different species. Under flow-through conditions this leads to multicomponent ionic dispersion: the dispersive fluxes of the different ions are cross-coupled due to the effects of Coulombic interactions. Such effects are illustrated in flow-through experiments in saturated porous media. Simple strong electrolytes were selected as tracers and their transport was studied under different advection-dominated conditions and in homogeneous and heterogeneous porous media. The interpretation of the experimental results requires a multicomponent modeling approach with an accurate description of local hydrodynamic dispersion and explicitly accounting for the cross-coupling of dispersive fluxes due to the Coulombic interactions between the charged species.
    Original languageEnglish
    Article numberEGU2015-1914
    JournalGeophysical Research Abstracts
    Volume17
    Number of pages1
    ISSN1607-7962
    Publication statusPublished - 2015
    EventEuropean Geosciences Union General Assembly 2015 - Austria Center Vienna , Vienna, Austria
    Duration: 12 Apr 201517 Apr 2015
    http://www.egu2015.eu/egu_today.html

    Conference

    ConferenceEuropean Geosciences Union General Assembly 2015
    LocationAustria Center Vienna
    Country/TerritoryAustria
    CityVienna
    Period12/04/201517/04/2015
    Internet address

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