• Login
    View Item 
    •   Home
    • University of Alaska Southeast
    • School of Arts and Sciences
    • Faculty and Staff
    • Amundson, Jason M.
    • View Item
    •   Home
    • University of Alaska Southeast
    • School of Arts and Sciences
    • Faculty and Staff
    • Amundson, Jason M.
    • 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

    Quantifying flow and stress in ice mélange, the world’s largest granular material.

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Burton et al 2018 PNAS Jason ...
    Size:
    1.679Mb
    Format:
    PDF
    Description:
    Main article
    Download
    Author
    Burton, J. C.
    Amundson, Jason M.
    Cassotto, R.
    Kuo, C. C.
    Dennin, M.
    Keyword
    jamming
    granular
    m ́elange
    calving
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/10003
    Abstract
    Tidewater glacier fjords are often filled with a collection of calved icebergs, brash ice, and sea ice. For glaciers with high calving rates, this “m ́elange” of ice can be jam-packed, so that the flow of ice fragments is mostly determined by granular interactions. In the jammed state, ice m ́elange has been hypothesized to influence iceberg calving and capsize, dispersion and attenuation of ocean waves, injection of freshwater into fjords, and fjord circulation. However, detailed measurements of ice m ́elange are lacking due to difficulties in instrumenting remote, ice-choked fjords. Here we characterize the flow and associated stress in icem ́elange, using a combination of terrestrial radar data, laboratory experiments, and numerical simulations. We find that, during periods of terminus quiescence, ice m ́elange experiences laminar flow over timescales of hours to days. The uniform flow fields are bounded by shear margins along fjord walls where force chains between granular icebergs terminate. In addition, the average force per unit width that is transmitted to the glacier terminus, which can exceed 107N/m, increases exponentially with them ́elange length-to-width ratio. These “buttressing” forces are sufficiently high to inhibit the initiation of large-scale calving events, supporting the notion that ice m ́elange can be viewed as a weak granular ice shelf that transmits stresses from fjord walls back to glacier termini.
    Date
    2018-03-29
    Source
    Proceedings of the National Academy of Sciences
    Publisher
    PNAS Proceedings of the National Academy of Sciences
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Burton, J. C., Amundson, J. M., Cassotto, R., Kuo, C. C., & Dennin, M. (2018). Quantifying flow and stress in ice mélange, the world’s largest granular material. Proceedings of the National Academy of Sciences, 115(20), 5105-5110.
    Collections
    Amundson, Jason M.

    entitlement

     
    ABOUT US|HELP|BROWSE|ADVANCED SEARCH

    The University of Alaska Fairbanks is an affirmative action/equal opportunity employer and educational institution and is a part of the University of Alaska system.

    ©UAF 2013 - 2023 | Questions? ua-scholarworks@alaska.edu | Last modified: September 25, 2019

    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.