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Controls on jökulhlaup-transported buried ice melt-out at Skeiðarársandur, Iceland: Implications for the evolution of ice-marginal environments

Blauvelt, David J.; Russell, Andrew J.; Large, Andrew R.G.; Tweed, Fiona S.; Hiemstra, John F.; Kulessa, Bernd; Evans, David J.A.; Waller, Richard I.

Controls on jökulhlaup-transported buried ice melt-out at Skeiðarársandur, Iceland: Implications for the evolution of ice-marginal environments Thumbnail


Authors

David J. Blauvelt

Andrew J. Russell

Andrew R.G. Large

Fiona S. Tweed

John F. Hiemstra

Bernd Kulessa

David J.A. Evans



Abstract

High-magnitude jökulhlaups, glacier margin position and ice-thickness have been identified as key controls on sandur evolution. Existing models however have focused primarily on observations made during short windows of time and often do not account for the subsequent modification of proglacial landsystems by repeated jökulhlaups or post-depositional modification due to melt out over decadal time-scales. Digital Elevation Models (DEMs) were used to reconstruct the development of large depressions on Skeiðarársandur, an outwash plain in southeast Iceland. These depressions measure up to 1?km in width and up to 13?m in depth and are associated with ice bodies up to 1?km in length and up to 150?m in height emplaced during a high-magnitude jökulhlaup in 1903 and subsequently buried by jökulhlaups in 1913 and 1922. The continued melting of the Harðaskriða ice bodies over a century following their emplacement, together with subsequent repeated burial, by high-magnitude jökulhlaups demonstrates that jökulhlaups may continue to serve as important controls on sandur evolution on a decadal to centennial timescale (101–102?years). The Harðaskriða depressions developed only following the retreat of the glacier margin after 1945, which highlights the controls of margin position on the evolution of the sandur. Margin position and thickness of the glacier profile was seen to affect not only the distribution and thickness of sediment emplaced during jökulhaups but also the rate and pattern of melt in the decades following the decoupling of the margin from the sandur. The jökulhlaup landsystem model signatures identified at this site may provide a useful analogue for interpreting landforms and strata emplaced by glacier margin fluctuations, jökulhlaups and melt out generated by retreating continental Pleistocene ice sheets.

Citation

Blauvelt, D. J., Russell, A. J., Large, A. R., Tweed, F. S., Hiemstra, J. F., Kulessa, B., …Waller, R. I. (2020). Controls on jökulhlaup-transported buried ice melt-out at Skeiðarársandur, Iceland: Implications for the evolution of ice-marginal environments. Geomorphology, 360, Article 107164. https://doi.org/10.1016/j.geomorph.2020.107164

Journal Article Type Article
Acceptance Date Mar 10, 2020
Online Publication Date Mar 24, 2020
Publication Date Jul 1, 2020
Journal Geomorphology
Print ISSN 0169-555X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 360
Article Number 107164
DOI https://doi.org/10.1016/j.geomorph.2020.107164
Keywords Jökulhlaup; Buried ice melt-out; Skeiðarársandur Iceland; Icemarginal environments
Publisher URL https://doi.org/10.1016/j.geomorph.2020.107164

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