Subglacial till behaviour derived from in situ wireless multi-sensor subglacial probes: Rheology, hydro-mechanical interactions and till formation
The rheology and hydro-mechanical interactions at the ice bed interface form an important component of the glacier system, influencing glacier dynamics and the formation of till. We demonstrate that the sand-rich till at Briksdalsbreen in Norway, undergoes deformation throughout the year. On the bul...
Published in: | Quaternary Science Reviews |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/67aead19-9204-47fe-8007-f1c88e09a7db 2024-01-28T10:01:00+01:00 Subglacial till behaviour derived from in situ wireless multi-sensor subglacial probes: Rheology, hydro-mechanical interactions and till formation Hart, Jane K. Rose, Kathryn C. Martinez, Kirk 2011-01 https://hdl.handle.net/1983/67aead19-9204-47fe-8007-f1c88e09a7db https://research-information.bris.ac.uk/en/publications/67aead19-9204-47fe-8007-f1c88e09a7db https://doi.org/10.1016/j.quascirev.2010.11.001 eng eng info:eu-repo/semantics/restrictedAccess Hart , J K , Rose , K C & Martinez , K 2011 , ' Subglacial till behaviour derived from in situ wireless multi-sensor subglacial probes: Rheology, hydro-mechanical interactions and till formation ' , Quaternary Science Reviews , vol. 30 , no. 1-2 , pp. 234-247 . https://doi.org/10.1016/j.quascirev.2010.11.001 SURGE-TYPE GLACIER ICE STREAM-B DEFORMATION BENEATH GLACIERS BASAL CONDITIONS BENEATH DEFORMING BED GLACIOTECTONIC DEFORMATION SEDIMENT DEFORMATION WEST ANTARCTICA STICKY SPOTS HYDRAULIC-PROPERTIES article 2011 ftubristolcris https://doi.org/10.1016/j.quascirev.2010.11.001 2024-01-04T23:40:19Z The rheology and hydro-mechanical interactions at the ice bed interface form an important component of the glacier system, influencing glacier dynamics and the formation of till. We demonstrate that the sand-rich till at Briksdalsbreen in Norway, undergoes deformation throughout the year. On the bulk rheology scale, till deformation exhibits elastic behaviour during the winter, when water pressures are low: and linear viscous behaviour after a critical yield stress of 35 kPa, when water pressures are high during the spring and summer. On the clast and matrix scale, low water pressures, correspond with high case stress variability and till temperatures. Meltwater driven, stick-slip, glacier velocity increases were transmitted through a relatively strong till grain network, causing brittle deformation. Intermediate water pressures, during late summer were linked to intermediate case stress variability and high till temperatures associated with the heat generated from stick-slip motion. High water pressures in the till were associated with low case stress variability and low, meltwater controlled, till temperatures, and occurred in the spring and autumn. Once the till was saturated, the ductile till absorbed any stick-slip velocity increases. We discuss, with examples, the different till forming processes associated with these changing conditions, demonstrating that the resultant till will represent a complex amalgamation of all of these processes. (C) 2010 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Antarc* Antarctica glacier Ice Stream B West Antarctica University of Bristol: Bristol Research Norway West Antarctica Quaternary Science Reviews 30 1-2 234 247 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
SURGE-TYPE GLACIER ICE STREAM-B DEFORMATION BENEATH GLACIERS BASAL CONDITIONS BENEATH DEFORMING BED GLACIOTECTONIC DEFORMATION SEDIMENT DEFORMATION WEST ANTARCTICA STICKY SPOTS HYDRAULIC-PROPERTIES |
spellingShingle |
SURGE-TYPE GLACIER ICE STREAM-B DEFORMATION BENEATH GLACIERS BASAL CONDITIONS BENEATH DEFORMING BED GLACIOTECTONIC DEFORMATION SEDIMENT DEFORMATION WEST ANTARCTICA STICKY SPOTS HYDRAULIC-PROPERTIES Hart, Jane K. Rose, Kathryn C. Martinez, Kirk Subglacial till behaviour derived from in situ wireless multi-sensor subglacial probes: Rheology, hydro-mechanical interactions and till formation |
topic_facet |
SURGE-TYPE GLACIER ICE STREAM-B DEFORMATION BENEATH GLACIERS BASAL CONDITIONS BENEATH DEFORMING BED GLACIOTECTONIC DEFORMATION SEDIMENT DEFORMATION WEST ANTARCTICA STICKY SPOTS HYDRAULIC-PROPERTIES |
description |
The rheology and hydro-mechanical interactions at the ice bed interface form an important component of the glacier system, influencing glacier dynamics and the formation of till. We demonstrate that the sand-rich till at Briksdalsbreen in Norway, undergoes deformation throughout the year. On the bulk rheology scale, till deformation exhibits elastic behaviour during the winter, when water pressures are low: and linear viscous behaviour after a critical yield stress of 35 kPa, when water pressures are high during the spring and summer. On the clast and matrix scale, low water pressures, correspond with high case stress variability and till temperatures. Meltwater driven, stick-slip, glacier velocity increases were transmitted through a relatively strong till grain network, causing brittle deformation. Intermediate water pressures, during late summer were linked to intermediate case stress variability and high till temperatures associated with the heat generated from stick-slip motion. High water pressures in the till were associated with low case stress variability and low, meltwater controlled, till temperatures, and occurred in the spring and autumn. Once the till was saturated, the ductile till absorbed any stick-slip velocity increases. We discuss, with examples, the different till forming processes associated with these changing conditions, demonstrating that the resultant till will represent a complex amalgamation of all of these processes. (C) 2010 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Hart, Jane K. Rose, Kathryn C. Martinez, Kirk |
author_facet |
Hart, Jane K. Rose, Kathryn C. Martinez, Kirk |
author_sort |
Hart, Jane K. |
title |
Subglacial till behaviour derived from in situ wireless multi-sensor subglacial probes: Rheology, hydro-mechanical interactions and till formation |
title_short |
Subglacial till behaviour derived from in situ wireless multi-sensor subglacial probes: Rheology, hydro-mechanical interactions and till formation |
title_full |
Subglacial till behaviour derived from in situ wireless multi-sensor subglacial probes: Rheology, hydro-mechanical interactions and till formation |
title_fullStr |
Subglacial till behaviour derived from in situ wireless multi-sensor subglacial probes: Rheology, hydro-mechanical interactions and till formation |
title_full_unstemmed |
Subglacial till behaviour derived from in situ wireless multi-sensor subglacial probes: Rheology, hydro-mechanical interactions and till formation |
title_sort |
subglacial till behaviour derived from in situ wireless multi-sensor subglacial probes: rheology, hydro-mechanical interactions and till formation |
publishDate |
2011 |
url |
https://hdl.handle.net/1983/67aead19-9204-47fe-8007-f1c88e09a7db https://research-information.bris.ac.uk/en/publications/67aead19-9204-47fe-8007-f1c88e09a7db https://doi.org/10.1016/j.quascirev.2010.11.001 |
geographic |
Norway West Antarctica |
geographic_facet |
Norway West Antarctica |
genre |
Antarc* Antarctica glacier Ice Stream B West Antarctica |
genre_facet |
Antarc* Antarctica glacier Ice Stream B West Antarctica |
op_source |
Hart , J K , Rose , K C & Martinez , K 2011 , ' Subglacial till behaviour derived from in situ wireless multi-sensor subglacial probes: Rheology, hydro-mechanical interactions and till formation ' , Quaternary Science Reviews , vol. 30 , no. 1-2 , pp. 234-247 . https://doi.org/10.1016/j.quascirev.2010.11.001 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2010.11.001 |
container_title |
Quaternary Science Reviews |
container_volume |
30 |
container_issue |
1-2 |
container_start_page |
234 |
op_container_end_page |
247 |
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1789325654868623360 |