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- W2158085995 abstract "Transverse dispersion is the most relevant process in mass transfer of contaminants across the capillary fringe (both directions), dilution of contaminants, and mixing of electron acceptors and electron donors in biodegrading groundwater plumes. This paper gives an overview on literature values of transverse vertical dispersivities alpha(tv) measured at different flow velocities and compares them to results from well-controlled laboratory-tank experiments on mass transfer of trichloroethene (TCE) across the capillary fringe. The measured values of transverse vertical dispersion in the capillary fringe region were larger than in fully saturated media, which is credited to enhanced tortuosity of the flow paths due to entrapped air within the capillary fringe. In all cases, the values observed for alpha(tv) were << 1 mm. The new measurements and the literature values indicate that alpha(tv) apparently declines with increasing flow velocity. The latter is attributed to incomplete diffusive mixing at the pore scale (pore throats). A simple conceptual model, based on the mean square displacement and the pore size accounting for only partial diffusive mixing at increasing flow velocities, shows very good agreement with measured and published data." @default.
- W2158085995 created "2016-06-24" @default.
- W2158085995 creator A5011040589 @default.
- W2158085995 creator A5033892009 @default.
- W2158085995 date "2002-09-01" @default.
- W2158085995 modified "2023-10-03" @default.
- W2158085995 title "Transverse vertical dispersion in groundwater and the capillary fringe" @default.
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- W2158085995 doi "https://doi.org/10.1016/s0169-7722(02)00011-6" @default.
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