Flow dynamics of an accumulation basin: a case study of upper Kahiltna Glacier, Mount McKinley, Alaska
We interpreted flow dynamics of the Kahiltna Pass Basin accumulation zone on Mount McKinley, Alaska, USA, using 40, 100 and 900 MHz ground-penetrating radar profiles and GPS surface velocity measurements. We found dipping, englacial surface-conformable strata that experienced vertical thickening as...
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ftuninhampshire:oai:scholars.unh.edu:earthsci_facpub-1515 2023-05-15T16:20:22+02:00 Flow dynamics of an accumulation basin: a case study of upper Kahiltna Glacier, Mount McKinley, Alaska Campbell, Seth Kreutz, K Osterberg, Erich Arcone, Steven Wake, Cameron P Volkening, Kevin Winski, Dominic 2012-02-01T08:00:00Z application/pdf https://scholars.unh.edu/earthsci_facpub/516 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1515&context=earthsci_facpub unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/earthsci_facpub/516 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1515&context=earthsci_facpub Earth Sciences Scholarship text 2012 ftuninhampshire 2023-01-30T21:35:20Z We interpreted flow dynamics of the Kahiltna Pass Basin accumulation zone on Mount McKinley, Alaska, USA, using 40, 100 and 900 MHz ground-penetrating radar profiles and GPS surface velocity measurements. We found dipping, englacial surface-conformable strata that experienced vertical thickening as the glacier flowed westward from a steep, higher-velocity (60 m a–1) region into flat terrain associated with a 908 bend in the glacier and lower velocities (15 m a–1) to the south. Stratigraphy near the western side of the basin was surface-conformable to 170 m depth and thinned as flow diverged southward, down-glacier. We found complex strata beneath the conformable stratigraphy and interpret these features as buried crevasses, avalanche debris and deformed ice caused by up-glacier events. We also suggest that basin dimensions, bed topography and the sharp bend each cause flow extension and compression, significantly contributing to conformable and complex strata thickness variations. Our findings show that surface-conformable stratigraphy continuous with depth and consistent strata thicknesses cannot be assumed in accumulation basins, because local and upglacier terrain and flow dynamics can cause structural complexities to occur under and within surfaceconformable layers. Text glacier Alaska University of New Hampshire: Scholars Repository |
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University of New Hampshire: Scholars Repository |
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description |
We interpreted flow dynamics of the Kahiltna Pass Basin accumulation zone on Mount McKinley, Alaska, USA, using 40, 100 and 900 MHz ground-penetrating radar profiles and GPS surface velocity measurements. We found dipping, englacial surface-conformable strata that experienced vertical thickening as the glacier flowed westward from a steep, higher-velocity (60 m a–1) region into flat terrain associated with a 908 bend in the glacier and lower velocities (15 m a–1) to the south. Stratigraphy near the western side of the basin was surface-conformable to 170 m depth and thinned as flow diverged southward, down-glacier. We found complex strata beneath the conformable stratigraphy and interpret these features as buried crevasses, avalanche debris and deformed ice caused by up-glacier events. We also suggest that basin dimensions, bed topography and the sharp bend each cause flow extension and compression, significantly contributing to conformable and complex strata thickness variations. Our findings show that surface-conformable stratigraphy continuous with depth and consistent strata thicknesses cannot be assumed in accumulation basins, because local and upglacier terrain and flow dynamics can cause structural complexities to occur under and within surfaceconformable layers. |
format |
Text |
author |
Campbell, Seth Kreutz, K Osterberg, Erich Arcone, Steven Wake, Cameron P Volkening, Kevin Winski, Dominic |
spellingShingle |
Campbell, Seth Kreutz, K Osterberg, Erich Arcone, Steven Wake, Cameron P Volkening, Kevin Winski, Dominic Flow dynamics of an accumulation basin: a case study of upper Kahiltna Glacier, Mount McKinley, Alaska |
author_facet |
Campbell, Seth Kreutz, K Osterberg, Erich Arcone, Steven Wake, Cameron P Volkening, Kevin Winski, Dominic |
author_sort |
Campbell, Seth |
title |
Flow dynamics of an accumulation basin: a case study of upper Kahiltna Glacier, Mount McKinley, Alaska |
title_short |
Flow dynamics of an accumulation basin: a case study of upper Kahiltna Glacier, Mount McKinley, Alaska |
title_full |
Flow dynamics of an accumulation basin: a case study of upper Kahiltna Glacier, Mount McKinley, Alaska |
title_fullStr |
Flow dynamics of an accumulation basin: a case study of upper Kahiltna Glacier, Mount McKinley, Alaska |
title_full_unstemmed |
Flow dynamics of an accumulation basin: a case study of upper Kahiltna Glacier, Mount McKinley, Alaska |
title_sort |
flow dynamics of an accumulation basin: a case study of upper kahiltna glacier, mount mckinley, alaska |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2012 |
url |
https://scholars.unh.edu/earthsci_facpub/516 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1515&context=earthsci_facpub |
genre |
glacier Alaska |
genre_facet |
glacier Alaska |
op_source |
Earth Sciences Scholarship |
op_relation |
https://scholars.unh.edu/earthsci_facpub/516 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1515&context=earthsci_facpub |
_version_ |
1766008281682149376 |