The effects of heterogeneities on the performance of capillary barriers for waste isolation

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The effects of heterogeneities on the performance of capillary barriers is investigated by simulating three systems comprised of a fine soil layer overlying a coarse gravel layer with homogeneous, layered heterogeneous, and random heterogeneous property fields. The amount of lateral diversion above the coarse layer under steady-state infiltration conditions is compared between the simulations. Results indicate that the performance of capillary barriers may be significantly influenced by the spatial variability of the properties. The layered heterogeneous system performed best as a result of horizontal features within the fine layer that acted as additional local capillary barriers that delayed breakthrough into ... continued below

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8 p.

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Ho, C.K. & Webb, S.W. February 1, 1997.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The effects of heterogeneities on the performance of capillary barriers is investigated by simulating three systems comprised of a fine soil layer overlying a coarse gravel layer with homogeneous, layered heterogeneous, and random heterogeneous property fields. The amount of lateral diversion above the coarse layer under steady-state infiltration conditions is compared between the simulations. Results indicate that the performance of capillary barriers may be significantly influenced by the spatial variability of the properties. The layered heterogeneous system performed best as a result of horizontal features within the fine layer that acted as additional local capillary barriers that delayed breakthrough into the coarse layer. The random heterogeneous system performed worst because of channeled flow that produced localized regions of water breakthrough into the coarse layer. These results indicate that engineered capillary barriers may be improved through emplacement and packing methods that induce a layered system similar to the layered heterogeneous field simulated in this study.

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8 p.

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INIS; OSTI as DE97002471

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  • International containment technology conference and exhibition, St. Petersburg, FL (United States), 9-12 Feb 1997

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  • Other: DE97002471
  • Report No.: SAND--97-0099C
  • Report No.: CONF-970208--2
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 432895
  • Archival Resource Key: ark:/67531/metadc677533

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Office of Scientific & Technical Information Technical Reports

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  • February 1, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • June 13, 2016, 7:22 p.m.

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Ho, C.K. & Webb, S.W. The effects of heterogeneities on the performance of capillary barriers for waste isolation, article, February 1, 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc677533/: accessed May 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.