Flow laws for glacier ice: comparison of numerical predictions and field measurements
This is the published version, also available here: http://dx.doi.org/10.3189/002214390793701372. Ice flow along the 20 km long strain network up-stream of the Dye 3 bore hole in Greenland is studied in detail. By solving the force—balance equations and using selected flow laws, stresses and strain-...
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Online Access: | http://hdl.handle.net/1808/17348 https://doi.org/10.3189/002214390793701372 |
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ftunivkansas:oai:kuscholarworks.ku.edu:1808/17348 2023-05-15T16:03:05+02:00 Flow laws for glacier ice: comparison of numerical predictions and field measurements van der Veen, Cornelis J. Whillans, I. M. 2015-04-08T20:33:31Z http://hdl.handle.net/1808/17348 https://doi.org/10.3189/002214390793701372 unknown International Glaciological Society Van Der Veen, C. J. & Whillans, I. M. "Flow Laws for Glacier ice: Comparison of Numerical Predictions and Field Measurements." Journal of Glaciology, Number 124, 1990, pp. 324-339(16). http://dx.doi.org/10.3189/002214390793701372. http://hdl.handle.net/1808/17348 doi:10.3189/002214390793701372 openAccess Article 2015 ftunivkansas https://doi.org/10.3189/002214390793701372 2022-08-26T13:16:46Z This is the published version, also available here: http://dx.doi.org/10.3189/002214390793701372. Ice flow along the 20 km long strain network up-stream of the Dye 3 bore hole in Greenland is studied in detail. By solving the force—balance equations and using selected flow laws, stresses and strain-rates are calculated throughout the section of the ice sheet. The validity of the results is evaluated by comparison with the velocity profile derived from bore-hole-tilting measurements, and with observed surface strain-rates. A number of constitutive relations are tried and most predict a velocity profile at the bore-hole site that is in good agreement with that observed, if appropriate enhancement factors are used. However, there are major discrepancies between modeled and measured surface strain-rates. Use of Nye's generalization of Glen's flow law, or an anisotropic constitutive relation, requires unrealistically large along-flow variations in the enhancement factor. Inclusion of normal stress effects can lead to much better agreement, but it is possible that other processes, such as dynamic recrystallization or primary creep, should be included in the constitutive relation of polar ice. Article in Journal/Newspaper Dye 3 Dye-3 glacier Greenland Ice Sheet Journal of Glaciology The University of Kansas: KU ScholarWorks Greenland Tilting ENVELOPE(-54.065,-54.065,49.700,49.700) Journal of Glaciology 36 124 324 339 |
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Open Polar |
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The University of Kansas: KU ScholarWorks |
op_collection_id |
ftunivkansas |
language |
unknown |
description |
This is the published version, also available here: http://dx.doi.org/10.3189/002214390793701372. Ice flow along the 20 km long strain network up-stream of the Dye 3 bore hole in Greenland is studied in detail. By solving the force—balance equations and using selected flow laws, stresses and strain-rates are calculated throughout the section of the ice sheet. The validity of the results is evaluated by comparison with the velocity profile derived from bore-hole-tilting measurements, and with observed surface strain-rates. A number of constitutive relations are tried and most predict a velocity profile at the bore-hole site that is in good agreement with that observed, if appropriate enhancement factors are used. However, there are major discrepancies between modeled and measured surface strain-rates. Use of Nye's generalization of Glen's flow law, or an anisotropic constitutive relation, requires unrealistically large along-flow variations in the enhancement factor. Inclusion of normal stress effects can lead to much better agreement, but it is possible that other processes, such as dynamic recrystallization or primary creep, should be included in the constitutive relation of polar ice. |
format |
Article in Journal/Newspaper |
author |
van der Veen, Cornelis J. Whillans, I. M. |
spellingShingle |
van der Veen, Cornelis J. Whillans, I. M. Flow laws for glacier ice: comparison of numerical predictions and field measurements |
author_facet |
van der Veen, Cornelis J. Whillans, I. M. |
author_sort |
van der Veen, Cornelis J. |
title |
Flow laws for glacier ice: comparison of numerical predictions and field measurements |
title_short |
Flow laws for glacier ice: comparison of numerical predictions and field measurements |
title_full |
Flow laws for glacier ice: comparison of numerical predictions and field measurements |
title_fullStr |
Flow laws for glacier ice: comparison of numerical predictions and field measurements |
title_full_unstemmed |
Flow laws for glacier ice: comparison of numerical predictions and field measurements |
title_sort |
flow laws for glacier ice: comparison of numerical predictions and field measurements |
publisher |
International Glaciological Society |
publishDate |
2015 |
url |
http://hdl.handle.net/1808/17348 https://doi.org/10.3189/002214390793701372 |
long_lat |
ENVELOPE(-54.065,-54.065,49.700,49.700) |
geographic |
Greenland Tilting |
geographic_facet |
Greenland Tilting |
genre |
Dye 3 Dye-3 glacier Greenland Ice Sheet Journal of Glaciology |
genre_facet |
Dye 3 Dye-3 glacier Greenland Ice Sheet Journal of Glaciology |
op_relation |
Van Der Veen, C. J. & Whillans, I. M. "Flow Laws for Glacier ice: Comparison of Numerical Predictions and Field Measurements." Journal of Glaciology, Number 124, 1990, pp. 324-339(16). http://dx.doi.org/10.3189/002214390793701372. http://hdl.handle.net/1808/17348 doi:10.3189/002214390793701372 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.3189/002214390793701372 |
container_title |
Journal of Glaciology |
container_volume |
36 |
container_issue |
124 |
container_start_page |
324 |
op_container_end_page |
339 |
_version_ |
1766398720181534720 |