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    Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada

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    Author
    Amundson, Jason M.
    Iverson, N. R.
    Keyword
    glacial erosion
    sliding velocity
    balance velocity
    hang heights
    glaciers
    Metadata
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    URI
    http://hdl.handle.net/11122/11312
    Abstract
    In most models of glacial erosion, glacier sliding velocity is hypothesized to control rates of bedrock erosion. If this hypothesis is correct, then the elevation difference between hanging and trunk valley floors, the hang height, should be dictated by the relative sliding velocities of the glaciers that occupied these valleys. By considering sliding velocity to be proportional to balance velocity and using mass continuity, hang height is expressed in terms of glacier catchment areas, slopes, and widths, which can be estimated for past glaciers from the morphology of glacial valleys. These parameters were estimated for 46 hanging valleys and their trunk valleys in three adjacent regions of Jasper National Park. The variability in valley morphology can account for 55–85% of the hang height variability if erosion rate scales with balance velocity raised to a power of 1/3. This correspondence is in spite of spatial variations in glaciation duration, snow accumulation rates, and other variables that likely affected hang heights but cannot be readily estimated and so are not included in our formulation. Thus it appears that balance velocity, and by extension, sliding velocity if the two are proportional, may be a reasonable control variable for assessing erosion rate.
    Description
    Acknowledgments. The glaciology group at the University of Alaska Fairbanks provided constructive feedback. Comments from R. S. Anderson, B. Hallet, B. Hubbard, J. Tomkin, and S. Tulaczyk improved the manuscript.
    Date
    2006
    Source
    Journal of Geophysical Research
    Publisher
    American Geophysical Union
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Amundson, J. M., and N. R. Iverson (2006), Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada, J. Geophys. Res., 111, F01020, doi:10.1029/2005JF000359.
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    Amundson, Jason M.

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