Classification and kinematics of the Planpincieux Glacier break-offs using photographic time-lapse analysis
Abstract Herein, we present results obtained from time-lapse imagery acquired by a digital single-lens reflex camera during 2014–18 used to monitor the Planpincieux Glacier on the Italian side of the Grandes Jorasses (Mont Blanc massif). We processed the images using image cross-correlation to measu...
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Language: | English |
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Cambridge University Press (CUP)
2020
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Online Access: | http://dx.doi.org/10.1017/jog.2019.99 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143019000996 |
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crcambridgeupr:10.1017/jog.2019.99 2024-09-09T19:49:02+00:00 Classification and kinematics of the Planpincieux Glacier break-offs using photographic time-lapse analysis Giordan, Daniele Dematteis, Niccolò Allasia, Paolo Motta, Elena 2020 http://dx.doi.org/10.1017/jog.2019.99 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143019000996 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 66, issue 256, page 188-202 ISSN 0022-1430 1727-5652 journal-article 2020 crcambridgeupr https://doi.org/10.1017/jog.2019.99 2024-07-17T04:01:51Z Abstract Herein, we present results obtained from time-lapse imagery acquired by a digital single-lens reflex camera during 2014–18 used to monitor the Planpincieux Glacier on the Italian side of the Grandes Jorasses (Mont Blanc massif). We processed the images using image cross-correlation to measure the surface kinematics of the most active lobe of the glacier that presents a high velocity and frequent ice detachments. During the monitoring, we observed two or three periods of sharp acceleration per year that culminated with large break-offs followed by analogous decelerations. Overall, we registered more than 350 failures with a volume >100 m 3 , of which, 14 events had volumes larger than 10 000 m 3 . The study identified a monotonic positive relationship between the velocity and failure volume that may be used to estimate the volume of the collapses before an event. We identified the thresholds of velocity and acceleration that characterise the activation of the speed-up periods. The study allowed the characterisation of three different instability processes that lead to the break-off of ice chunks from the glacier terminus: (i) disaggregation, (ii) slab fracture and (iii) water tunnelling failure which can be differentiated based on the rheology, the volume involved and the trigger process. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) Journal of Glaciology 66 256 188 202 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract Herein, we present results obtained from time-lapse imagery acquired by a digital single-lens reflex camera during 2014–18 used to monitor the Planpincieux Glacier on the Italian side of the Grandes Jorasses (Mont Blanc massif). We processed the images using image cross-correlation to measure the surface kinematics of the most active lobe of the glacier that presents a high velocity and frequent ice detachments. During the monitoring, we observed two or three periods of sharp acceleration per year that culminated with large break-offs followed by analogous decelerations. Overall, we registered more than 350 failures with a volume >100 m 3 , of which, 14 events had volumes larger than 10 000 m 3 . The study identified a monotonic positive relationship between the velocity and failure volume that may be used to estimate the volume of the collapses before an event. We identified the thresholds of velocity and acceleration that characterise the activation of the speed-up periods. The study allowed the characterisation of three different instability processes that lead to the break-off of ice chunks from the glacier terminus: (i) disaggregation, (ii) slab fracture and (iii) water tunnelling failure which can be differentiated based on the rheology, the volume involved and the trigger process. |
format |
Article in Journal/Newspaper |
author |
Giordan, Daniele Dematteis, Niccolò Allasia, Paolo Motta, Elena |
spellingShingle |
Giordan, Daniele Dematteis, Niccolò Allasia, Paolo Motta, Elena Classification and kinematics of the Planpincieux Glacier break-offs using photographic time-lapse analysis |
author_facet |
Giordan, Daniele Dematteis, Niccolò Allasia, Paolo Motta, Elena |
author_sort |
Giordan, Daniele |
title |
Classification and kinematics of the Planpincieux Glacier break-offs using photographic time-lapse analysis |
title_short |
Classification and kinematics of the Planpincieux Glacier break-offs using photographic time-lapse analysis |
title_full |
Classification and kinematics of the Planpincieux Glacier break-offs using photographic time-lapse analysis |
title_fullStr |
Classification and kinematics of the Planpincieux Glacier break-offs using photographic time-lapse analysis |
title_full_unstemmed |
Classification and kinematics of the Planpincieux Glacier break-offs using photographic time-lapse analysis |
title_sort |
classification and kinematics of the planpincieux glacier break-offs using photographic time-lapse analysis |
publisher |
Cambridge University Press (CUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1017/jog.2019.99 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143019000996 |
long_lat |
ENVELOPE(69.468,69.468,-49.461,-49.461) |
geographic |
Mont Blanc |
geographic_facet |
Mont Blanc |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 66, issue 256, page 188-202 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2019.99 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
256 |
container_start_page |
188 |
op_container_end_page |
202 |
_version_ |
1809918409775775744 |