PMID: 12236551Sep 19, 2002

Transverse vertical dispersion in groundwater and the capillary fringe

Journal of Contaminant Hydrology
I D Klenk, Peter Grathwohl

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 pub...Continue Reading

Citations

Apr 10, 2003·Journal of Contaminant Hydrology·Christina Eberhardt, Peter Grathwohl
Oct 31, 2013·Environmental Engineering Science·Rui ShenEric M Suuberg
Dec 3, 2014·Journal of Contaminant Hydrology·Donato CitarellaAndrea Zanini
Dec 18, 2007·Journal of Contaminant Hydrology·Robert D BauerChristian Griebler
Jun 15, 2007·Journal of Contaminant Hydrology·P A S HamPeter Grathwohl
May 2, 2007·Ground Water·Marco MassabòOmbretta Paladino
Mar 25, 2006·Ground Water·Olaf A CirpkaPeter Grathwohl
Mar 7, 2012·Environmental Toxicology and Chemistry·Sara PiconeHuub Rijnaarts
Sep 8, 2011·Ground Water·Amanda MarruffoCharles J Werth
Feb 15, 2013·Ground Water·Christina M HabererPeter Grathwohl
Nov 28, 2015·The Science of the Total Environment·Kerstin E ScherrManfred Nahold
Feb 28, 2006·Journal of Contaminant Hydrology·U Maier, Peter Grathwohl
Aug 24, 2005·Journal of Contaminant Hydrology·Md Arifur RahmanOlaf A Cirpka
Jul 12, 2005·Journal of Contaminant Hydrology·Olaf A Cirpka
Dec 18, 2013·Ground Water·Christina M HabererPeter Grathwohl
Jun 18, 2016·Ground Water·Grant R CareyStan Feenstra
Aug 17, 2005·Journal of Contaminant Hydrology·Mette ChristophersenPeter Kjeldsen
Nov 10, 2009·Journal of Contaminant Hydrology·Massimo RollePeter Grathwohl
Dec 24, 2011·Journal of Contaminant Hydrology·Alexandre BontonRené Therrien
Nov 2, 2018·Ground Water·Alraune ZechGedeon Dagan
Jun 24, 2008·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Svenja T LohnerAndreas Tiehm

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