Sediment transport dynamics on an ice-covered lake: The 'floating' boulders of Lake Hoare, Antarctica
© © Antarctic Science Ltd 2014. Between 1995 and 2011 a global positioning system survey of 13 boulders and three ablation stakes (long stakes frozen in the ice) on the frozen surface of Lake Hoare was undertaken. Data interpretation illustrates complexities of post-depositional transport dynamics...
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Online Access: | https://repository.lsu.edu/geo_pubs/613 https://doi.org/10.1017/S0954102014000558 |
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ftlouisianastuir:oai:repository.lsu.edu:geo_pubs-1612 2024-09-15T17:46:02+00:00 Sediment transport dynamics on an ice-covered lake: The 'floating' boulders of Lake Hoare, Antarctica Allen, Phillip P. Hewitt, Richard Obryk, Maciej K. Doran, Peter T. 2014-01-01T08:00:00Z https://repository.lsu.edu/geo_pubs/613 https://doi.org/10.1017/S0954102014000558 unknown LSU Scholarly Repository https://repository.lsu.edu/geo_pubs/613 doi:10.1017/S0954102014000558 Faculty Publications lake ice non-linear plate rafting rolling text 2014 ftlouisianastuir https://doi.org/10.1017/S0954102014000558 2024-08-08T04:27:15Z © © Antarctic Science Ltd 2014. Between 1995 and 2011 a global positioning system survey of 13 boulders and three ablation stakes (long stakes frozen in the ice) on the frozen surface of Lake Hoare was undertaken. Data interpretation illustrates complexities of post-depositional transport dynamics of boulders. Earlier studies on comparable datasets have suggested linear 'conveyor' type transport mechanisms for lake surface boulders. Yet explanations for non-linear boulder displacements or 'walks' and the mechanisms responsible for movements are inadequate. Two modes of boulder specific movement were observed. First, localized changes in the ice surface promote individual boulder movement (rolling). Second, ice rafting, which indicates the displacement of 'plates' of lake ice on which the boulder is located. Ablation stakes used as fixed survey control points support the hypothesis that ice cover moves as discrete plates rather than as a single homogenous mass. Factors that create the conditions to generate either of the two modes of movement may be related to location specific energy budgets. A relationship between average orientations and prevailing wind direction was also observed. The investigation describes the local-scale behaviour of surveyed boulders, and offers methodologies and interpretive frameworks for additional studies of modern and ancient sediment transportation dynamics in Antarctic lacustrine environments. Text Antarc* Antarctic Antarctica LSU Digital Commons (Louisiana State University) Antarctic Science 27 2 173 184 |
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LSU Digital Commons (Louisiana State University) |
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lake ice non-linear plate rafting rolling |
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lake ice non-linear plate rafting rolling Allen, Phillip P. Hewitt, Richard Obryk, Maciej K. Doran, Peter T. Sediment transport dynamics on an ice-covered lake: The 'floating' boulders of Lake Hoare, Antarctica |
topic_facet |
lake ice non-linear plate rafting rolling |
description |
© © Antarctic Science Ltd 2014. Between 1995 and 2011 a global positioning system survey of 13 boulders and three ablation stakes (long stakes frozen in the ice) on the frozen surface of Lake Hoare was undertaken. Data interpretation illustrates complexities of post-depositional transport dynamics of boulders. Earlier studies on comparable datasets have suggested linear 'conveyor' type transport mechanisms for lake surface boulders. Yet explanations for non-linear boulder displacements or 'walks' and the mechanisms responsible for movements are inadequate. Two modes of boulder specific movement were observed. First, localized changes in the ice surface promote individual boulder movement (rolling). Second, ice rafting, which indicates the displacement of 'plates' of lake ice on which the boulder is located. Ablation stakes used as fixed survey control points support the hypothesis that ice cover moves as discrete plates rather than as a single homogenous mass. Factors that create the conditions to generate either of the two modes of movement may be related to location specific energy budgets. A relationship between average orientations and prevailing wind direction was also observed. The investigation describes the local-scale behaviour of surveyed boulders, and offers methodologies and interpretive frameworks for additional studies of modern and ancient sediment transportation dynamics in Antarctic lacustrine environments. |
format |
Text |
author |
Allen, Phillip P. Hewitt, Richard Obryk, Maciej K. Doran, Peter T. |
author_facet |
Allen, Phillip P. Hewitt, Richard Obryk, Maciej K. Doran, Peter T. |
author_sort |
Allen, Phillip P. |
title |
Sediment transport dynamics on an ice-covered lake: The 'floating' boulders of Lake Hoare, Antarctica |
title_short |
Sediment transport dynamics on an ice-covered lake: The 'floating' boulders of Lake Hoare, Antarctica |
title_full |
Sediment transport dynamics on an ice-covered lake: The 'floating' boulders of Lake Hoare, Antarctica |
title_fullStr |
Sediment transport dynamics on an ice-covered lake: The 'floating' boulders of Lake Hoare, Antarctica |
title_full_unstemmed |
Sediment transport dynamics on an ice-covered lake: The 'floating' boulders of Lake Hoare, Antarctica |
title_sort |
sediment transport dynamics on an ice-covered lake: the 'floating' boulders of lake hoare, antarctica |
publisher |
LSU Scholarly Repository |
publishDate |
2014 |
url |
https://repository.lsu.edu/geo_pubs/613 https://doi.org/10.1017/S0954102014000558 |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Faculty Publications |
op_relation |
https://repository.lsu.edu/geo_pubs/613 doi:10.1017/S0954102014000558 |
op_doi |
https://doi.org/10.1017/S0954102014000558 |
container_title |
Antarctic Science |
container_volume |
27 |
container_issue |
2 |
container_start_page |
173 |
op_container_end_page |
184 |
_version_ |
1810493986833432576 |