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    Blocking a wave: frequency band gaps in ice shelves with periodic crevasses

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    Name:
    Freed-Brown et al 2012 AnnGlac ...
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    Author
    Freed-Brown, Julian
    Amundson, Jason M.
    MacAyeal, Douglas R.
    Zhang, Wendy W.
    Keyword
    glaciers
    ice shelves
    crevasses
    elastic-flexural waves
    band gaps
    ocean wave/ice shelf interactions
    ice shelf
    Metadata
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    URI
    http://hdl.handle.net/11122/11016
    Abstract
    We assess how the propagation of high-frequency elastic-flexural waves through an ice shelf is modified by the presence of spatially periodic crevasses. Analysis of the normal modes supported by the ice shelf with and without crevasses reveals that a periodic crevasse distribution qualitatively changes the mechanical response. The normal modes of an ice shelf free of crevasses are evenly distributed as a function of frequency. In contrast, the normal modes of a crevasse-ridden ice shelf are distributed unevenly. There are ‘band gaps’, frequency ranges over which no eigenmodes exist. A model ice shelf that is 50 km in lateral extent and 300 m thick with crevasses spaced 500 m apart has a band gap from 0.2 to 0.38 Hz. This is a frequency range relevant for ocean-wave/ice-shelf interactions. When the outermost edge of the crevassed ice shelf is oscillated at a frequency within the band gap, the ice shelf responds very differently from a crevasse-free ice shelf. The flexural motion of the crevassed ice shelf is confined to a small region near the outermost edge of the ice shelf and effectively ‘blocked’ from reaching the interior.
    Description
    We assess how the propagation of high-frequency elastic-flexural waves through an ice shelf is modified by the presence of spatially periodic crevasses. Analysis of the normal modes supported by the ice shelf with and without crevasses reveals that a periodic crevasse distribution qualitatively changes the mechanical response.
    Date
    2012
    Publisher
    International Glaciological Society
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Freed-Brown, J., Amundson, J.M., MacAyeal, D.R. and Zhang, W.W., 2012. Blocking a wave: frequency band gaps in ice shelves with periodic crevasses. Annals of glaciology, 53(60), pp.85-89.
    Collections
    Amundson, Jason M.

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