Modelling and characterizing glacier-bed overdeepenings as sites for potential future lakes in the deglaciating French Alps
Glacier retreat results in major landscape changes including the formation of new lakes in Glacier-Bed Overdeepenings (GBOs) that can provoke catastrophic Glacial Lake Outburst Flood (GLOF) hazards, but could also provide economic opportunities. This study aims to identify and characterize the locat...
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Universite de Clermont-Ferrand II (Blaise Pascal) * Departement de Geologie
2021
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Online Access: | https://www.zora.uzh.ch/id/eprint/203143/ https://www.zora.uzh.ch/id/eprint/203143/1/2021_Cathala_etal_2021_final.pdf https://doi.org/10.5167/uzh-203143 https://doi.org/10.4000/geomorphologie.15255 |
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ftunivzuerich:oai:www.zora.uzh.ch:203143 2024-06-23T07:53:42+00:00 Modelling and characterizing glacier-bed overdeepenings as sites for potential future lakes in the deglaciating French Alps Cathala, Maeva Magnin, Florence Linsbauer, Andreas Haeberli, Wilfried 2021-04-30 application/pdf https://www.zora.uzh.ch/id/eprint/203143/ https://www.zora.uzh.ch/id/eprint/203143/1/2021_Cathala_etal_2021_final.pdf https://doi.org/10.5167/uzh-203143 https://doi.org/10.4000/geomorphologie.15255 eng eng Universite de Clermont-Ferrand II (Blaise Pascal) * Departement de Geologie https://www.zora.uzh.ch/id/eprint/203143/1/2021_Cathala_etal_2021_final.pdf doi:10.5167/uzh-203143 doi:10.4000/geomorphologie.15255 urn:issn:1957-777X info:eu-repo/semantics/restrictedAccess Cathala, Maeva; Magnin, Florence; Linsbauer, Andreas; Haeberli, Wilfried (2021). Modelling and characterizing glacier-bed overdeepenings as sites for potential future lakes in the deglaciating French Alps. Geomorphologie, 27(1):19-36. Institute of Geography 910 Geography & travel Earth-Surface Processes Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2021 ftunivzuerich https://doi.org/10.5167/uzh-20314310.4000/geomorphologie.15255 2024-05-29T01:10:30Z Glacier retreat results in major landscape changes including the formation of new lakes in Glacier-Bed Overdeepenings (GBOs) that can provoke catastrophic Glacial Lake Outburst Flood (GLOF) hazards, but could also provide economic opportunities. This study aims to identify and characterize the location of potential GBOs in the French Alps as possible sites for future lakes. We first ran GlabTop (Glacier-bed Topography) and GlabTop2 models, two GIS schemes calculating glacier ice thickness and mapping potential GBOs. Their level of confidence is estimated using morphological analysis based on slope angle, crevasse fields and lateral narrowing at bedrock thresholds. 139 GBOs (>0.01km²) were predicted among which 59 have medium to very high confidence. 20 lakes are already forming at the snout of retreating glaciers, including four lakes at predicted GBOs <0,01km². The Vanoise massif hosts 43% of the predicted GBOs but the Mont Blanc massif gathers larger, deeper and more voluminous ones. Most of the predicted GBOs are below 3,500m a.s.l. as related to the elevation of the corresponding glaciers. In the Vanoise massif, many predicted GBOs have rather low confidence because of the extent of ice-cap like glaciers for which the shear stress approach used by GlabTop becomes questionable. Furthermore, 58 potential GBOs were detected by visual analysis of glacier morphologies. The study highlights the relevance of combining various methods to determine GBOs and is a first step towards the anticipation of future risks and opportunities related to the formation of new lakes in the French Alps. Article in Journal/Newspaper Ice cap University of Zurich (UZH): ZORA (Zurich Open Repository and Archive Four Lakes ENVELOPE(-126.826,-126.826,54.858,54.858) Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) New Lakes ENVELOPE(177.649,177.649,51.951,51.951) |
institution |
Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel Earth-Surface Processes |
spellingShingle |
Institute of Geography 910 Geography & travel Earth-Surface Processes Cathala, Maeva Magnin, Florence Linsbauer, Andreas Haeberli, Wilfried Modelling and characterizing glacier-bed overdeepenings as sites for potential future lakes in the deglaciating French Alps |
topic_facet |
Institute of Geography 910 Geography & travel Earth-Surface Processes |
description |
Glacier retreat results in major landscape changes including the formation of new lakes in Glacier-Bed Overdeepenings (GBOs) that can provoke catastrophic Glacial Lake Outburst Flood (GLOF) hazards, but could also provide economic opportunities. This study aims to identify and characterize the location of potential GBOs in the French Alps as possible sites for future lakes. We first ran GlabTop (Glacier-bed Topography) and GlabTop2 models, two GIS schemes calculating glacier ice thickness and mapping potential GBOs. Their level of confidence is estimated using morphological analysis based on slope angle, crevasse fields and lateral narrowing at bedrock thresholds. 139 GBOs (>0.01km²) were predicted among which 59 have medium to very high confidence. 20 lakes are already forming at the snout of retreating glaciers, including four lakes at predicted GBOs <0,01km². The Vanoise massif hosts 43% of the predicted GBOs but the Mont Blanc massif gathers larger, deeper and more voluminous ones. Most of the predicted GBOs are below 3,500m a.s.l. as related to the elevation of the corresponding glaciers. In the Vanoise massif, many predicted GBOs have rather low confidence because of the extent of ice-cap like glaciers for which the shear stress approach used by GlabTop becomes questionable. Furthermore, 58 potential GBOs were detected by visual analysis of glacier morphologies. The study highlights the relevance of combining various methods to determine GBOs and is a first step towards the anticipation of future risks and opportunities related to the formation of new lakes in the French Alps. |
format |
Article in Journal/Newspaper |
author |
Cathala, Maeva Magnin, Florence Linsbauer, Andreas Haeberli, Wilfried |
author_facet |
Cathala, Maeva Magnin, Florence Linsbauer, Andreas Haeberli, Wilfried |
author_sort |
Cathala, Maeva |
title |
Modelling and characterizing glacier-bed overdeepenings as sites for potential future lakes in the deglaciating French Alps |
title_short |
Modelling and characterizing glacier-bed overdeepenings as sites for potential future lakes in the deglaciating French Alps |
title_full |
Modelling and characterizing glacier-bed overdeepenings as sites for potential future lakes in the deglaciating French Alps |
title_fullStr |
Modelling and characterizing glacier-bed overdeepenings as sites for potential future lakes in the deglaciating French Alps |
title_full_unstemmed |
Modelling and characterizing glacier-bed overdeepenings as sites for potential future lakes in the deglaciating French Alps |
title_sort |
modelling and characterizing glacier-bed overdeepenings as sites for potential future lakes in the deglaciating french alps |
publisher |
Universite de Clermont-Ferrand II (Blaise Pascal) * Departement de Geologie |
publishDate |
2021 |
url |
https://www.zora.uzh.ch/id/eprint/203143/ https://www.zora.uzh.ch/id/eprint/203143/1/2021_Cathala_etal_2021_final.pdf https://doi.org/10.5167/uzh-203143 https://doi.org/10.4000/geomorphologie.15255 |
long_lat |
ENVELOPE(-126.826,-126.826,54.858,54.858) ENVELOPE(-129.463,-129.463,58.259,58.259) ENVELOPE(69.468,69.468,-49.461,-49.461) ENVELOPE(177.649,177.649,51.951,51.951) |
geographic |
Four Lakes Glacial Lake Mont Blanc New Lakes |
geographic_facet |
Four Lakes Glacial Lake Mont Blanc New Lakes |
genre |
Ice cap |
genre_facet |
Ice cap |
op_source |
Cathala, Maeva; Magnin, Florence; Linsbauer, Andreas; Haeberli, Wilfried (2021). Modelling and characterizing glacier-bed overdeepenings as sites for potential future lakes in the deglaciating French Alps. Geomorphologie, 27(1):19-36. |
op_relation |
https://www.zora.uzh.ch/id/eprint/203143/1/2021_Cathala_etal_2021_final.pdf doi:10.5167/uzh-203143 doi:10.4000/geomorphologie.15255 urn:issn:1957-777X |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.5167/uzh-20314310.4000/geomorphologie.15255 |
_version_ |
1802645467459223552 |