Instruments and Methods: Direct measurement of sliding at the glacier bed
Sliding at the base of Trapridge Glacier, Yukon Territory, Canada, was measured using a “drag spool”. We describe this simple and inexpensive instrument as well as its installation and operation. From 1990 to 1992 seven sites were instrumented with drag spools. At six of the sites basal sliding, dur...
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International Glaciological Society
1994
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ftcaltechauth:oai:authors.library.caltech.edu:90933 2023-05-15T16:22:26+02:00 Instruments and Methods: Direct measurement of sliding at the glacier bed Blake, Erik W. Fischer, Urs H. Clarke, Garry K. G. 1994 application/pdf https://authors.library.caltech.edu/90933/ https://authors.library.caltech.edu/90933/1/instruments_and_methods_direct_measurement_of_sliding_at_the_glacier_bed.pdf https://resolver.caltech.edu/CaltechAUTHORS:20181115-154024433 en eng International Glaciological Society https://authors.library.caltech.edu/90933/1/instruments_and_methods_direct_measurement_of_sliding_at_the_glacier_bed.pdf Blake, Erik W. and Fischer, Urs H. and Clarke, Garry K. G. (1994) Instruments and Methods: Direct measurement of sliding at the glacier bed. Journal of Glaciology, 40 (136). pp. 595-599. ISSN 0022-1430. doi:10.3189/s002214300001248x. https://resolver.caltech.edu/CaltechAUTHORS:20181115-154024433 <https://resolver.caltech.edu/CaltechAUTHORS:20181115-154024433> other Article PeerReviewed 1994 ftcaltechauth https://doi.org/10.3189/s002214300001248x 2021-11-18T18:48:23Z Sliding at the base of Trapridge Glacier, Yukon Territory, Canada, was measured using a “drag spool”. We describe this simple and inexpensive instrument as well as its installation and operation. From 1990 to 1992 seven sites were instrumented with drag spools. At six of the sites basal sliding, during the period of observation, accounted for 50-70% of the total flow observed at the glacier surface. The contribution from ice creep is known to be small, so most of the remaining surface motion must be attributed to subglacial sediment deformation. For the seventh site the observed sliding rate was ~ 90% of the total flow, an indication that the sliding contribution varies spatially across the bed. Diurnal variations in the response of one of our instruments appear to be correlated to subglacial water-pressure fluctuations and are interpreted in terms of changes in sliding velocity rather than the opening and closing of basal cavities. Article in Journal/Newspaper glacier* Journal of Glaciology Yukon Caltech Authors (California Institute of Technology) Canada Trapridge Glacier ENVELOPE(-140.337,-140.337,61.233,61.233) Yukon Journal of Glaciology 40 136 595 599 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
English |
description |
Sliding at the base of Trapridge Glacier, Yukon Territory, Canada, was measured using a “drag spool”. We describe this simple and inexpensive instrument as well as its installation and operation. From 1990 to 1992 seven sites were instrumented with drag spools. At six of the sites basal sliding, during the period of observation, accounted for 50-70% of the total flow observed at the glacier surface. The contribution from ice creep is known to be small, so most of the remaining surface motion must be attributed to subglacial sediment deformation. For the seventh site the observed sliding rate was ~ 90% of the total flow, an indication that the sliding contribution varies spatially across the bed. Diurnal variations in the response of one of our instruments appear to be correlated to subglacial water-pressure fluctuations and are interpreted in terms of changes in sliding velocity rather than the opening and closing of basal cavities. |
format |
Article in Journal/Newspaper |
author |
Blake, Erik W. Fischer, Urs H. Clarke, Garry K. G. |
spellingShingle |
Blake, Erik W. Fischer, Urs H. Clarke, Garry K. G. Instruments and Methods: Direct measurement of sliding at the glacier bed |
author_facet |
Blake, Erik W. Fischer, Urs H. Clarke, Garry K. G. |
author_sort |
Blake, Erik W. |
title |
Instruments and Methods: Direct measurement of sliding at the glacier bed |
title_short |
Instruments and Methods: Direct measurement of sliding at the glacier bed |
title_full |
Instruments and Methods: Direct measurement of sliding at the glacier bed |
title_fullStr |
Instruments and Methods: Direct measurement of sliding at the glacier bed |
title_full_unstemmed |
Instruments and Methods: Direct measurement of sliding at the glacier bed |
title_sort |
instruments and methods: direct measurement of sliding at the glacier bed |
publisher |
International Glaciological Society |
publishDate |
1994 |
url |
https://authors.library.caltech.edu/90933/ https://authors.library.caltech.edu/90933/1/instruments_and_methods_direct_measurement_of_sliding_at_the_glacier_bed.pdf https://resolver.caltech.edu/CaltechAUTHORS:20181115-154024433 |
long_lat |
ENVELOPE(-140.337,-140.337,61.233,61.233) |
geographic |
Canada Trapridge Glacier Yukon |
geographic_facet |
Canada Trapridge Glacier Yukon |
genre |
glacier* Journal of Glaciology Yukon |
genre_facet |
glacier* Journal of Glaciology Yukon |
op_relation |
https://authors.library.caltech.edu/90933/1/instruments_and_methods_direct_measurement_of_sliding_at_the_glacier_bed.pdf Blake, Erik W. and Fischer, Urs H. and Clarke, Garry K. G. (1994) Instruments and Methods: Direct measurement of sliding at the glacier bed. Journal of Glaciology, 40 (136). pp. 595-599. ISSN 0022-1430. doi:10.3189/s002214300001248x. https://resolver.caltech.edu/CaltechAUTHORS:20181115-154024433 <https://resolver.caltech.edu/CaltechAUTHORS:20181115-154024433> |
op_rights |
other |
op_doi |
https://doi.org/10.3189/s002214300001248x |
container_title |
Journal of Glaciology |
container_volume |
40 |
container_issue |
136 |
container_start_page |
595 |
op_container_end_page |
599 |
_version_ |
1766010406704250880 |