Direct shear tests of materials from a cold glacier: Implications for landform development
The mechanical properties of materials at the ice-bed interface exert a major control on glacier behaviour and define the nature and rate of subglacial erosion. This paper presents new data on the strength and behaviour of basal ice and substrate of the Suess Glacier, south Victoria Land, Antarctica...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2001
|
Subjects: | |
Online Access: | http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/94724 https://dipot.ulb.ac.be/dspace/bitstream/2013/94724/1/Elsevier_73518.pdf |
id |
ftunivbruxelles:oai:dipot.ulb.ac.be:2013/94724 |
---|---|
record_format |
openpolar |
spelling |
ftunivbruxelles:oai:dipot.ulb.ac.be:2013/94724 2023-05-15T13:35:46+02:00 Direct shear tests of materials from a cold glacier: Implications for landform development Fitzsimons, Sean McManus, Kevin J Sirota, Paul Lorrain, Reginald 2001 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/94724 https://dipot.ulb.ac.be/dspace/bitstream/2013/94724/1/Elsevier_73518.pdf en eng uri/info:doi/10.1016/S1040-6182(01)00055-6 uri/info:pii/S1040618201000556 uri/info:scp/0035652489 https://dipot.ulb.ac.be/dspace/bitstream/2013/94724/1/Elsevier_73518.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/94724 1 full-text file(s): info:eu-repo/semantics/restrictedAccess Quaternary international, 86 Glaciologie info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2001 ftunivbruxelles 2022-06-12T20:30:28Z The mechanical properties of materials at the ice-bed interface exert a major control on glacier behaviour and define the nature and rate of subglacial erosion. This paper presents new data on the strength and behaviour of basal ice and substrate of the Suess Glacier, south Victoria Land, Antarctica which is a small alpine dry-based glacier that has a basal temperature of -17°C. A tunnel excavated in the glacier revealed a substrate composed of frozen sand and gravel and a basal zone that was 3.8-m-thick. From bottom to top, the basal zone was composed of 1.8 m of stratified, complexly deformed layers of ice and debris-laden ice that was overlain by a 0.9-m-thick layer of frozen sediment and a 0.8-m-thick layer of discoloured ice that lies immediately beneath clean glacier ice. Direct shear tests were performed in the field on 36 samples using a strain rate of 0.85 mm/h and on replicate samples in a laboratory at strain rates of 0.08 and 0.01 mm/h. The experiments performed in the field show that the average peak shear strength of substrate samples was 2.53 MPa, which is almost twice as strong as the average value for basal ice (1.28 MPa), and the glacier ice samples (1.39 MPa). The laboratory experiments show that the behaviour and peak strength of samples sheared at the higher strain rates are considerably greater than the peak and residual strengths measured during the lower strain rate tests. The direct shear tests suggest that the glacier substrate is unlikely to deform at the current temperature. © 2001 Published by Elsevier Science Ltd. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctica Suess Glacier Victoria Land DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Suess Glacier ENVELOPE(162.667,162.667,-77.633,-77.633) Victoria Land |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Glaciologie |
spellingShingle |
Glaciologie Fitzsimons, Sean McManus, Kevin J Sirota, Paul Lorrain, Reginald Direct shear tests of materials from a cold glacier: Implications for landform development |
topic_facet |
Glaciologie |
description |
The mechanical properties of materials at the ice-bed interface exert a major control on glacier behaviour and define the nature and rate of subglacial erosion. This paper presents new data on the strength and behaviour of basal ice and substrate of the Suess Glacier, south Victoria Land, Antarctica which is a small alpine dry-based glacier that has a basal temperature of -17°C. A tunnel excavated in the glacier revealed a substrate composed of frozen sand and gravel and a basal zone that was 3.8-m-thick. From bottom to top, the basal zone was composed of 1.8 m of stratified, complexly deformed layers of ice and debris-laden ice that was overlain by a 0.9-m-thick layer of frozen sediment and a 0.8-m-thick layer of discoloured ice that lies immediately beneath clean glacier ice. Direct shear tests were performed in the field on 36 samples using a strain rate of 0.85 mm/h and on replicate samples in a laboratory at strain rates of 0.08 and 0.01 mm/h. The experiments performed in the field show that the average peak shear strength of substrate samples was 2.53 MPa, which is almost twice as strong as the average value for basal ice (1.28 MPa), and the glacier ice samples (1.39 MPa). The laboratory experiments show that the behaviour and peak strength of samples sheared at the higher strain rates are considerably greater than the peak and residual strengths measured during the lower strain rate tests. The direct shear tests suggest that the glacier substrate is unlikely to deform at the current temperature. © 2001 Published by Elsevier Science Ltd. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Fitzsimons, Sean McManus, Kevin J Sirota, Paul Lorrain, Reginald |
author_facet |
Fitzsimons, Sean McManus, Kevin J Sirota, Paul Lorrain, Reginald |
author_sort |
Fitzsimons, Sean |
title |
Direct shear tests of materials from a cold glacier: Implications for landform development |
title_short |
Direct shear tests of materials from a cold glacier: Implications for landform development |
title_full |
Direct shear tests of materials from a cold glacier: Implications for landform development |
title_fullStr |
Direct shear tests of materials from a cold glacier: Implications for landform development |
title_full_unstemmed |
Direct shear tests of materials from a cold glacier: Implications for landform development |
title_sort |
direct shear tests of materials from a cold glacier: implications for landform development |
publishDate |
2001 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/94724 https://dipot.ulb.ac.be/dspace/bitstream/2013/94724/1/Elsevier_73518.pdf |
long_lat |
ENVELOPE(162.667,162.667,-77.633,-77.633) |
geographic |
Suess Glacier Victoria Land |
geographic_facet |
Suess Glacier Victoria Land |
genre |
Antarc* Antarctica Suess Glacier Victoria Land |
genre_facet |
Antarc* Antarctica Suess Glacier Victoria Land |
op_source |
Quaternary international, 86 |
op_relation |
uri/info:doi/10.1016/S1040-6182(01)00055-6 uri/info:pii/S1040618201000556 uri/info:scp/0035652489 https://dipot.ulb.ac.be/dspace/bitstream/2013/94724/1/Elsevier_73518.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/94724 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1766070089450258432 |