Interaction of density flow and geochemical processes on islands in the Okavanga Delta, Botswana

Peter Bauer-Gottwein, T. Langer, H. Prommer, P. Wolski, W. Kinzelbach

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Abstract

This paper analyses the interactions of density driven flow and geochemical reactions
under evapo-concentration. A multi-species hydrodynamic flow and transport simulation
model (SEAWAT) is coupled to a batch reaction model (PHREEQC) to analyze densitydriven
flow on islands in the Okavango Delta, Botswana. Evapo-concentration on the islands
leads to steadily increasing concentrations until the onset of density-driven flow against the
evaporation-induced upward gradient. Lag times to the onset of density-driven flow are
strongly influenced by geochemical reactions. Mineral precipitation and carbon dioxide offgassing
increase the lag time. Carbon dioxide off-gassing is enhanced in the presence of
significant amounts of humic substances. Simulation results further depend sensitively on the
assumed dispersivity.
Original languageEnglish
Title of host publicationProceedings of the XVI International Conference on Computational Methods in Water Resources, Copenhagen, Denmark 18-22 June 2006
EditorsPhilip John Binning, P. Engesgaard, H. Dahle, G.F. Pinder, W.G. Gray
Number of pages8
Place of PublicationKgs. Lyngby
PublisherTechnical University of Denmark
Publication date2006
Pages1-8
Publication statusPublished - 2006
Event16th International Conference on Computational Methods in Water Resources - Copenhagen, Denmark
Duration: 18 Jun 200622 Jun 2006
Conference number: 16

Conference

Conference16th International Conference on Computational Methods in Water Resources
Number16
CountryDenmark
CityCopenhagen
Period18/06/200622/06/2006

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