Rock glacier destabilization in the French Alps : insights from regional and local scale assessments
As occurring to several geosystems on our planet, mountain permafrost is threatened by climate change as prolonged warming may compromise the geotechnical properties of the frozen ground. As result, increasing occurrence of rockfall activity, thermokarst formation and rock glacier acceleration was o...
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ftunivnantes:oai:HAL:tel-02145649v1 2023-05-15T17:57:02+02:00 Rock glacier destabilization in the French Alps : insights from regional and local scale assessments Déstabilisation des glaciers rocheux dans les Alpes Françaises : une évaluation à l'échelle régionale et locale Marcer, Marco Pacte, Laboratoire de sciences sociales (PACTE) Sciences Po Grenoble - Institut d'études politiques de Grenoble (IEPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Université Grenoble Alpes Philippe Schoeneich 2018-12-19 https://theses.hal.science/tel-02145649 https://theses.hal.science/tel-02145649/document https://theses.hal.science/tel-02145649/file/MARCER_2018_diffusion.pdf en eng HAL CCSD NNT: 2018GREAU048 tel-02145649 https://theses.hal.science/tel-02145649 https://theses.hal.science/tel-02145649/document https://theses.hal.science/tel-02145649/file/MARCER_2018_diffusion.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-02145649 Geography. Université Grenoble Alpes, 2018. English. ⟨NNT : 2018GREAU048⟩ Rock glacier Natural hazards Destabilization Glacier rocheux Risques naturels Déstabilisation [SHS.GEO]Humanities and Social Sciences/Geography info:eu-repo/semantics/doctoralThesis Theses 2018 ftunivnantes 2023-03-08T05:29:25Z As occurring to several geosystems on our planet, mountain permafrost is threatened by climate change as prolonged warming may compromise the geotechnical properties of the frozen ground. As result, increasing occurrence of rockfall activity, thermokarst formation and rock glacier acceleration was observed in the past decades. Rock glacier destabilization, a process that compromises the structural integrity of these landforms, seems to be linked to atmospheric warming, gaining interest in the past years. The destabilization, which may be triggered by warming permafrost or mechanical stress, is characterized by an anomalous acceleration of the landform and the occurrence of specific features such as cracks and crevasses on its surface. Although the occurrence of these processes is mostly transitory, determining a textit{crisis} phase of the landform, in exceptional cases it may lead the rock glacier to structural collapse.This PhD thesis provided an assessment on the occurrence and related processes of rock glacier destabilization in the French Alps. At first, the spatial occurrence of debris permafrost was assessed in order to provide the permafrost distribution map of the French Alps, a tool that was necessary to evaluate permafrost conditions at rock glaciers sites. The second step consisted in an identification of destabilized rock glaciers in the region, which was done by multiple orthoimages interpretation aimed to identify features typically observable on destabilized rock glacier. Once identified the destabilized rock glaciers it was possible to analyse the typical topographical settings in which destabilization occurs and to to spot those landforms that are susceptible to experience this phenomenon. After these efforts at the regional scale, the focus was shifted towards local scale investigations at the Lou rock glacier, a partially destabilized landform that, due to frontal failure, in August 2015 triggered a debris flow that caused significant damages to buildings. The analysis aimed to better define ... Doctoral or Postdoctoral Thesis permafrost Thermokarst Université de Nantes: HAL-UNIV-NANTES |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Rock glacier Natural hazards Destabilization Glacier rocheux Risques naturels Déstabilisation [SHS.GEO]Humanities and Social Sciences/Geography |
spellingShingle |
Rock glacier Natural hazards Destabilization Glacier rocheux Risques naturels Déstabilisation [SHS.GEO]Humanities and Social Sciences/Geography Marcer, Marco Rock glacier destabilization in the French Alps : insights from regional and local scale assessments |
topic_facet |
Rock glacier Natural hazards Destabilization Glacier rocheux Risques naturels Déstabilisation [SHS.GEO]Humanities and Social Sciences/Geography |
description |
As occurring to several geosystems on our planet, mountain permafrost is threatened by climate change as prolonged warming may compromise the geotechnical properties of the frozen ground. As result, increasing occurrence of rockfall activity, thermokarst formation and rock glacier acceleration was observed in the past decades. Rock glacier destabilization, a process that compromises the structural integrity of these landforms, seems to be linked to atmospheric warming, gaining interest in the past years. The destabilization, which may be triggered by warming permafrost or mechanical stress, is characterized by an anomalous acceleration of the landform and the occurrence of specific features such as cracks and crevasses on its surface. Although the occurrence of these processes is mostly transitory, determining a textit{crisis} phase of the landform, in exceptional cases it may lead the rock glacier to structural collapse.This PhD thesis provided an assessment on the occurrence and related processes of rock glacier destabilization in the French Alps. At first, the spatial occurrence of debris permafrost was assessed in order to provide the permafrost distribution map of the French Alps, a tool that was necessary to evaluate permafrost conditions at rock glaciers sites. The second step consisted in an identification of destabilized rock glaciers in the region, which was done by multiple orthoimages interpretation aimed to identify features typically observable on destabilized rock glacier. Once identified the destabilized rock glaciers it was possible to analyse the typical topographical settings in which destabilization occurs and to to spot those landforms that are susceptible to experience this phenomenon. After these efforts at the regional scale, the focus was shifted towards local scale investigations at the Lou rock glacier, a partially destabilized landform that, due to frontal failure, in August 2015 triggered a debris flow that caused significant damages to buildings. The analysis aimed to better define ... |
author2 |
Pacte, Laboratoire de sciences sociales (PACTE) Sciences Po Grenoble - Institut d'études politiques de Grenoble (IEPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Université Grenoble Alpes Philippe Schoeneich |
format |
Doctoral or Postdoctoral Thesis |
author |
Marcer, Marco |
author_facet |
Marcer, Marco |
author_sort |
Marcer, Marco |
title |
Rock glacier destabilization in the French Alps : insights from regional and local scale assessments |
title_short |
Rock glacier destabilization in the French Alps : insights from regional and local scale assessments |
title_full |
Rock glacier destabilization in the French Alps : insights from regional and local scale assessments |
title_fullStr |
Rock glacier destabilization in the French Alps : insights from regional and local scale assessments |
title_full_unstemmed |
Rock glacier destabilization in the French Alps : insights from regional and local scale assessments |
title_sort |
rock glacier destabilization in the french alps : insights from regional and local scale assessments |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://theses.hal.science/tel-02145649 https://theses.hal.science/tel-02145649/document https://theses.hal.science/tel-02145649/file/MARCER_2018_diffusion.pdf |
genre |
permafrost Thermokarst |
genre_facet |
permafrost Thermokarst |
op_source |
https://theses.hal.science/tel-02145649 Geography. Université Grenoble Alpes, 2018. English. ⟨NNT : 2018GREAU048⟩ |
op_relation |
NNT: 2018GREAU048 tel-02145649 https://theses.hal.science/tel-02145649 https://theses.hal.science/tel-02145649/document https://theses.hal.science/tel-02145649/file/MARCER_2018_diffusion.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766165391302721536 |