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    Sediment redistribution beneath the terminus of an advancing glacier, Taku Glacier (T’aakú Kwáan Sít’i), Alaska.

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    Name:
    Zechmann et al 2021 JGlac - Jason ...
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    Author
    Zechmann, Jenna M.
    Truffer, Martin
    Motyka, R. J.
    Amundson, Jason M.
    Larsen, Christopher F.
    la
    Keyword
    Atmosphere/ice/ocean interactions
    fluvial transport
    glacier hydrology
    moraine formation
    processes and landforms of glacial erosion
    Metadata
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    URI
    http://hdl.handle.net/11122/12161
    Abstract
    The recently-advancing Taku Glacier is excavating subglacial sediments at high rates over multidecadal timescales. However, sediment redistribution over shorter timescales remains unquantified. We use a variety of methods to study subglacial and proglacial sediment redistribution on decadal, seasonal, and daily timescales to gain insight into sub- and proglacial landscape formation. Both excavation and deposition were observed from 2003 to 2015 (2.8 ± 0.9ma−1 to +2.9 ± 0.9ma−1). The observed patterns imply that a subglacial conduit has occupied the same site over the past decade. Outwash fans on the subaerial end moraine experience fluvial sediment reworking almost year-round, with net sediment gain in winter and net sediment loss in summer, and an overall mass gain between 2005 and 2015.We estimate that tens of meters of sediment still underlie the glacier terminus, sediments which can be remobilized during future activity. However, imminent retreat from the proglacial moraine will limit its sediment supply, leaving the moraine vulnerable to erosion by bordering rivers. Retreat into an over-deepened basin will leave the glacier vulnerable to increased frontal ablation and accelerating retreat.
    Date
    2020-12-23
    Publisher
    Cambridge University Press
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Zechmann JM, Truffer M, Motyka RJ, Amundson JM, Larsen CF (2021). Sediment redistribution beneath the terminus of an advancing glacier, Taku Glacier (T’aakú Kwáan Sít’i), Alaska. Journal of Glaciology 67 (262), 204–218. https://doi.org/10.1017/jog.2020.101
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    Amundson, Jason M.

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