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Comparison of transport persistence and dispersion length for strongly heterogeneous conductivity fields
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
2008 (English)Conference paper, Published paper (Other academic)
Abstract [en]

When modelling transport in fractured and other strongly heterogeneous media, the classical ADE-approach with a continuum dispersion coefficient is usually not applicable. This has led to the development of alternative approaches, often based on particle tracking. When upscaling travel time information by means of particle travel time distributions, it is, however, not obvious how the distributions of travel times among neighbouring elements should be spatially correlated. In our earlier works (Öhman et al, WRR 2005, WO3016, Oden at al. WRR 2008, WO2421) we have introduced the concept of transport persistence to account for this 'memory' of travel times. Transport persistence is a distance that, for example, a fast particle remains fast. The present study investigates the nature of transport persistence for different characteristics of the underlying hydraulic conductivity field – defined through the standard deviation and correlation length of K – and compares it to the classical dispersion length that can also be determined based on the statistical characteristics of the conductivity field. Flow and particle tracking simulations are carried out for heterogeneous conductivity fields for ten different combinations of standard deviation and correlation length values. Sixty realizations are considered for each combination, and for each realization a large number particles are released. The relationship between the transport persistence distance and the dispersion length is examined. Preliminary results indicate that the correlation between the two concepts depends on the values of the standard deviations of hydraulic conductivity, i.e., the degree of heterogeneity and transport channelling. Implications of these results will be discussed.

Place, publisher, year, edition, pages
2008.
Keyword [en]
Hydrogeology
National Category
Oceanography, Hydrology, Water Resources
Research subject
Hydrology
Identifiers
URN: urn:nbn:se:uu:diva-152955OAI: oai:DiVA.org:uu-152955DiVA: diva2:414697
Conference
AGU fall meeting San Francisco, CA, 15-19 December 2008
Note

Abstract for a poster presented at the AGU fall meeting 2008.

Available from: 2011-05-04 Created: 2011-05-04 Last updated: 2013-10-15Bibliographically approved

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Larsson, MartinNiemi, AuliTsang, Chin-Fu

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CiteExportLink to record
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  • apa
  • ieee
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