Estimating glacier-bed overdeepenings as possible sites of future lakes in the de-glaciating Mont Blanc massif (Western European Alps)
De-glaciating high mountain areas result in new landscapes of bedrock and debris where permafrost can degrade, persist or even newly form in cases, and of new lakes in glacier bed overdeepenings (GBOs) becoming ice-free. These landscapes with new lakes in close neighborhood to over-steepened and per...
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ftunivzuerich:oai:www.zora.uzh.ch:177462 2024-09-30T14:36:25+00:00 Estimating glacier-bed overdeepenings as possible sites of future lakes in the de-glaciating Mont Blanc massif (Western European Alps) Magnin, Florence Haeberli, Wilfried Linsbauer, Andreas Deline, Philip Ravanel, Ludovic 2020-02-01 application/pdf https://www.zora.uzh.ch/id/eprint/177462/ https://www.zora.uzh.ch/id/eprint/177462/1/2019_Magnin_et_al_2020_Geomorphology.pdf https://doi.org/10.5167/uzh-177462 https://doi.org/10.1016/j.geomorph.2019.106913 eng eng Elsevier https://www.zora.uzh.ch/id/eprint/177462/1/2019_Magnin_et_al_2020_Geomorphology.pdf doi:10.5167/uzh-177462 doi:10.1016/j.geomorph.2019.106913 urn:issn:0169-555X info:eu-repo/semantics/restrictedAccess Magnin, Florence; Haeberli, Wilfried; Linsbauer, Andreas; Deline, Philip; Ravanel, Ludovic (2020). Estimating glacier-bed overdeepenings as possible sites of future lakes in the de-glaciating Mont Blanc massif (Western European Alps). Geomorphology, 350:106913. Institute of Geography 910 Geography & travel Earth-Surface Processes Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftunivzuerich https://doi.org/10.5167/uzh-17746210.1016/j.geomorph.2019.106913 2024-09-04T00:39:06Z De-glaciating high mountain areas result in new landscapes of bedrock and debris where permafrost can degrade, persist or even newly form in cases, and of new lakes in glacier bed overdeepenings (GBOs) becoming ice-free. These landscapes with new lakes in close neighborhood to over-steepened and perennially frozen slopes are prone to chain reaction processes (e.g. rock-ice avalanches into lakes triggering impact waves, dam breach or overtopping, and debris flows) with potentially far-reaching run-out distances causing valley floors devastation. The frequency, magnitude and zonation of hazards are shifting, requiring integrative approaches combining comprehensive information about landscape evolution and related processes to support stakeholders in their adaptation strategies. In this study, we intend to setup an essential baseline for such an integrative approach in the Mont Blanc massif (MBM), which is a typical high-mountain range affected by de-glaciation processes. We first (i) predict and (ii) detect potential GBOs by combining the GlabTop model with a visual analysis based on morphological indications of glacier flow through over-deepened bed parts. We then (iii) determine the level of confidence concerning the resulting information, and (iv) estimate the approximate time range under which potential lakes could form. The location of the predicted GBOs and the shape of glacier beds are evaluated against currently forming water bodies at retreating glacier snouts, and seismic and ice penetrating radar measurements on the Argentière glacier. This comparison shows that the location of predicted GBOs is quite robust whereas their morphometric characteristics (depth, volume) are highly uncertain and tend to be underestimated. In total, 48/80 of the predicted or detected GBOs have a high level of confidence. In addition to five recently formed water bodies at glacier snouts, one of the high confidence GBOs (Talèfre glacier) which is also the most voluminous one could form imminently (during coming years), if not ... Article in Journal/Newspaper Ice permafrost University of Zurich (UZH): ZORA (Zurich Open Repository and Archive 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 Magnin, Florence Haeberli, Wilfried Linsbauer, Andreas Deline, Philip Ravanel, Ludovic Estimating glacier-bed overdeepenings as possible sites of future lakes in the de-glaciating Mont Blanc massif (Western European Alps) |
topic_facet |
Institute of Geography 910 Geography & travel Earth-Surface Processes |
description |
De-glaciating high mountain areas result in new landscapes of bedrock and debris where permafrost can degrade, persist or even newly form in cases, and of new lakes in glacier bed overdeepenings (GBOs) becoming ice-free. These landscapes with new lakes in close neighborhood to over-steepened and perennially frozen slopes are prone to chain reaction processes (e.g. rock-ice avalanches into lakes triggering impact waves, dam breach or overtopping, and debris flows) with potentially far-reaching run-out distances causing valley floors devastation. The frequency, magnitude and zonation of hazards are shifting, requiring integrative approaches combining comprehensive information about landscape evolution and related processes to support stakeholders in their adaptation strategies. In this study, we intend to setup an essential baseline for such an integrative approach in the Mont Blanc massif (MBM), which is a typical high-mountain range affected by de-glaciation processes. We first (i) predict and (ii) detect potential GBOs by combining the GlabTop model with a visual analysis based on morphological indications of glacier flow through over-deepened bed parts. We then (iii) determine the level of confidence concerning the resulting information, and (iv) estimate the approximate time range under which potential lakes could form. The location of the predicted GBOs and the shape of glacier beds are evaluated against currently forming water bodies at retreating glacier snouts, and seismic and ice penetrating radar measurements on the Argentière glacier. This comparison shows that the location of predicted GBOs is quite robust whereas their morphometric characteristics (depth, volume) are highly uncertain and tend to be underestimated. In total, 48/80 of the predicted or detected GBOs have a high level of confidence. In addition to five recently formed water bodies at glacier snouts, one of the high confidence GBOs (Talèfre glacier) which is also the most voluminous one could form imminently (during coming years), if not ... |
format |
Article in Journal/Newspaper |
author |
Magnin, Florence Haeberli, Wilfried Linsbauer, Andreas Deline, Philip Ravanel, Ludovic |
author_facet |
Magnin, Florence Haeberli, Wilfried Linsbauer, Andreas Deline, Philip Ravanel, Ludovic |
author_sort |
Magnin, Florence |
title |
Estimating glacier-bed overdeepenings as possible sites of future lakes in the de-glaciating Mont Blanc massif (Western European Alps) |
title_short |
Estimating glacier-bed overdeepenings as possible sites of future lakes in the de-glaciating Mont Blanc massif (Western European Alps) |
title_full |
Estimating glacier-bed overdeepenings as possible sites of future lakes in the de-glaciating Mont Blanc massif (Western European Alps) |
title_fullStr |
Estimating glacier-bed overdeepenings as possible sites of future lakes in the de-glaciating Mont Blanc massif (Western European Alps) |
title_full_unstemmed |
Estimating glacier-bed overdeepenings as possible sites of future lakes in the de-glaciating Mont Blanc massif (Western European Alps) |
title_sort |
estimating glacier-bed overdeepenings as possible sites of future lakes in the de-glaciating mont blanc massif (western european alps) |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://www.zora.uzh.ch/id/eprint/177462/ https://www.zora.uzh.ch/id/eprint/177462/1/2019_Magnin_et_al_2020_Geomorphology.pdf https://doi.org/10.5167/uzh-177462 https://doi.org/10.1016/j.geomorph.2019.106913 |
long_lat |
ENVELOPE(69.468,69.468,-49.461,-49.461) ENVELOPE(177.649,177.649,51.951,51.951) |
geographic |
Mont Blanc New Lakes |
geographic_facet |
Mont Blanc New Lakes |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Magnin, Florence; Haeberli, Wilfried; Linsbauer, Andreas; Deline, Philip; Ravanel, Ludovic (2020). Estimating glacier-bed overdeepenings as possible sites of future lakes in the de-glaciating Mont Blanc massif (Western European Alps). Geomorphology, 350:106913. |
op_relation |
https://www.zora.uzh.ch/id/eprint/177462/1/2019_Magnin_et_al_2020_Geomorphology.pdf doi:10.5167/uzh-177462 doi:10.1016/j.geomorph.2019.106913 urn:issn:0169-555X |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.5167/uzh-17746210.1016/j.geomorph.2019.106913 |
_version_ |
1811639482350305280 |