Strain-rate estimates for crevasse formation at an alpine ice divide: Mount Hunter, Alaska
ABSTRACT. Crevasse initiation is linked to strain rates that range over three orders of magnitude (0.001 and 0.163 a -1 ) as a result of the temperature-dependent nonlinear rheological properties of ice and from water and debris inclusions. Here we discuss a small cold glacier that contains buried c...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1040.9571 2023-05-15T16:20:41+02:00 Strain-rate estimates for crevasse formation at an alpine ice divide: Mount Hunter, Alaska Seth Campbell Samuel Roy Karl Kreutz Steven A Arcone Erich C Osterberg Peter Koons The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1040.9571 http://www.dartmouth.edu/%7Eeosterberg/images/Campbell%20et%20al.,%202013%20Strain%20rate%20estimates%20from%20Hunter.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1040.9571 http://www.dartmouth.edu/%7Eeosterberg/images/Campbell%20et%20al.,%202013%20Strain%20rate%20estimates%20from%20Hunter.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.dartmouth.edu/%7Eeosterberg/images/Campbell%20et%20al.,%202013%20Strain%20rate%20estimates%20from%20Hunter.pdf text ftciteseerx 2020-03-08T01:24:33Z ABSTRACT. Crevasse initiation is linked to strain rates that range over three orders of magnitude (0.001 and 0.163 a -1 ) as a result of the temperature-dependent nonlinear rheological properties of ice and from water and debris inclusions. Here we discuss a small cold glacier that contains buried crevasses at and near an ice divide. Surface-conformable stratigraphy, the glacier's small size, and cold temperatures argue for limited rheological variability at this site. Surface ice-flow velocities of (1.2-15.5) AE AE 0.472 m a -1 imply classic saddle flow surrounding the ice divide. Numerical models that incorporate field-observed boundary conditions suggest extensional strain rates of 0.003-0.015 a -1 , which fall within the published estimates required for crevasse initiation. The occurrence of one crevasse beginning at 50 m depth that appears to penetrate close to the bed suggests that it formed at depth. Field data and numerical models indicate that a higher interior stress at this crevasse location may be associated with steep convex bed topography; however, the dynamics that caused its formation are not entirely clear. Text glacier Alaska Unknown Mount Hunter ENVELOPE(-62.400,-62.400,-64.083,-64.083) |
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ftciteseerx |
language |
English |
description |
ABSTRACT. Crevasse initiation is linked to strain rates that range over three orders of magnitude (0.001 and 0.163 a -1 ) as a result of the temperature-dependent nonlinear rheological properties of ice and from water and debris inclusions. Here we discuss a small cold glacier that contains buried crevasses at and near an ice divide. Surface-conformable stratigraphy, the glacier's small size, and cold temperatures argue for limited rheological variability at this site. Surface ice-flow velocities of (1.2-15.5) AE AE 0.472 m a -1 imply classic saddle flow surrounding the ice divide. Numerical models that incorporate field-observed boundary conditions suggest extensional strain rates of 0.003-0.015 a -1 , which fall within the published estimates required for crevasse initiation. The occurrence of one crevasse beginning at 50 m depth that appears to penetrate close to the bed suggests that it formed at depth. Field data and numerical models indicate that a higher interior stress at this crevasse location may be associated with steep convex bed topography; however, the dynamics that caused its formation are not entirely clear. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Seth Campbell Samuel Roy Karl Kreutz Steven A Arcone Erich C Osterberg Peter Koons |
spellingShingle |
Seth Campbell Samuel Roy Karl Kreutz Steven A Arcone Erich C Osterberg Peter Koons Strain-rate estimates for crevasse formation at an alpine ice divide: Mount Hunter, Alaska |
author_facet |
Seth Campbell Samuel Roy Karl Kreutz Steven A Arcone Erich C Osterberg Peter Koons |
author_sort |
Seth Campbell |
title |
Strain-rate estimates for crevasse formation at an alpine ice divide: Mount Hunter, Alaska |
title_short |
Strain-rate estimates for crevasse formation at an alpine ice divide: Mount Hunter, Alaska |
title_full |
Strain-rate estimates for crevasse formation at an alpine ice divide: Mount Hunter, Alaska |
title_fullStr |
Strain-rate estimates for crevasse formation at an alpine ice divide: Mount Hunter, Alaska |
title_full_unstemmed |
Strain-rate estimates for crevasse formation at an alpine ice divide: Mount Hunter, Alaska |
title_sort |
strain-rate estimates for crevasse formation at an alpine ice divide: mount hunter, alaska |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1040.9571 http://www.dartmouth.edu/%7Eeosterberg/images/Campbell%20et%20al.,%202013%20Strain%20rate%20estimates%20from%20Hunter.pdf |
long_lat |
ENVELOPE(-62.400,-62.400,-64.083,-64.083) |
geographic |
Mount Hunter |
geographic_facet |
Mount Hunter |
genre |
glacier Alaska |
genre_facet |
glacier Alaska |
op_source |
http://www.dartmouth.edu/%7Eeosterberg/images/Campbell%20et%20al.,%202013%20Strain%20rate%20estimates%20from%20Hunter.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1040.9571 http://www.dartmouth.edu/%7Eeosterberg/images/Campbell%20et%20al.,%202013%20Strain%20rate%20estimates%20from%20Hunter.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766008653288046592 |