• Login
    View Item 
    •   Home
    • University of Alaska Fairbanks
    • UAF Graduate School
    • Older Theses Not Clearly Affiliated with a Current College
    • View Item
    •   Home
    • University of Alaska Fairbanks
    • UAF Graduate School
    • Older Theses Not Clearly Affiliated with a Current College
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Scholarworks@UACommunitiesPublication DateAuthorsTitlesSubjectsTypeThis CollectionPublication DateAuthorsTitlesSubjectsType

    My Account

    Login

    First Time Submitters, Register Here

    Register

    Statistics

    Display statistics

    Salt redistribution during freezing of saline sand columns with applications to subsea permafrost

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Baker_G_1987.pdf
    Size:
    3.505Mb
    Format:
    PDF
    Download
    Author
    Baker, Grant Cody
    Chair
    Osterkamp, T. E.
    Keyword
    Geophysics
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/9273
    Abstract
    Laboratory experiments were designed to investigate salt redistribution during the freezing of saline sand columns and to obtain information on salt movement in saturated sands and reconstituted subsea permafrost samples. The results of these experiments were combined with results from field investigations of subsea permafrost at Prudhoe Bay, Alaska to develop an improved understanding of salt redistribution during freezing and the movement of salt in the seabed sediments. These processes can produce soil solution salinities in the sediments greater than about 50 ppt. Comparison of spring and fall salinity profiles indicate salt movement with velocities of at least 2 m/year. Laboratory freezing (downward) tests of saline sand columns show significant salt redistribution at growth rates between 0.1 and 2 cm/day. Salt movement was observed with velocities of at least 2 cm/day. Salt movement in the unfrozen soil solution in partially frozen sand appears to be the result of gravity drainage. Freezing upward produced no significant salt redistribution. Salt fingering experiments showed that salt fingers could move with velocities of several cm/hr and suggest that it may be a major mechanism for rapid salt movement in subsea permafrost. Fingers (freshwater) at a thawing fresh ice boundary overlain by thawed saline soil solution displayed similar rapid movement behavior. Laboratory measurements of the hydraulic conductivity, K, of subsea permafrost samples yielded values that were 10$\sp2$ to 10$\sp3$ times greater than previously reported in-situ measurements. While it is difficult to apply the laboratory results to subsea permafrost under field conditions, these greater values for K and the large salt fingering velocities suggest that gravity-driven convection, in the form of salt fingering, should be considered as a primary mechanism for rapid salt transport in subsea permafrost.
    Description
    Dissertation (Ph.D.) University of Alaska Fairbanks, 1987
    Date
    1987
    Type
    Dissertation
    Collections
    Older Theses Not Clearly Affiliated with a Current College
    Theses (Unassigned)

    entitlement

     
    ABOUT US|HELP|BROWSE|ADVANCED SEARCH

    The University of Alaska is an affirmative action/equal opportunity employer, educational institution and provider and prohibits illegal discrimination against any individual.

    Learn more about UA’s notice of nondiscrimination.

    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.