Present status and development of rock glacier complexes in south-faced valleys (45°N, French Alps)
International audience The landscapes of the Vallon de la Route and Vallon de Pradieu (France) display typical geomorphological features of the Southern French Alps, with very few or no glaciers but a wide periglacial belt that extends from 2500 to 3100 m a.s.l. These valleys are unusual in that the...
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ftunivsavoie:oai:HAL:halsde-00948088v1 2024-04-28T08:23:42+00:00 Present status and development of rock glacier complexes in south-faced valleys (45°N, French Alps) Bodin, Xavier Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) 2013 https://hal.science/halsde-00948088 https://doi.org/10.4461/GFDQ.2013.36.2 en eng HAL CCSD Comitato Glaciologico Italiano info:eu-repo/semantics/altIdentifier/doi/10.4461/GFDQ.2013.36.2 halsde-00948088 https://hal.science/halsde-00948088 doi:10.4461/GFDQ.2013.36.2 ISSN: 0391-9838 Geografia Fisica e Dinamica Quaternaria https://hal.science/halsde-00948088 Geografia Fisica e Dinamica Quaternaria, 2013, 36 (2), pp. 27-28. ⟨10.4461/GFDQ.2013.36.2⟩ info:eu-repo/semantics/article Journal articles 2013 ftunivsavoie https://doi.org/10.4461/GFDQ.2013.36.2 2024-04-11T00:10:42Z International audience The landscapes of the Vallon de la Route and Vallon de Pradieu (France) display typical geomorphological features of the Southern French Alps, with very few or no glaciers but a wide periglacial belt that extends from 2500 to 3100 m a.s.l. These valleys are unusual in that they contain several generations of rock glaciers that, from their rooting zone to their front, have developed in a topoclimatic setting characterised by high mean insolation (southerly aspect) and relatively low altitude. In this work, we determined the present status of these landforms, and more precisely the characteristics of the icy layers within the rock glaciers, via electrical soundings and thermal measurements, which we then combined with field observations. The permafrost zones in both areas are highly fragmented, whereas ground-ice can be present in landforms previously assumed as relict on the basis of their geomorphological characteristics alone. We used an empirical relationship between rock glacier flow velocity and terrain slope to estimate the time needed for both rock glacier assemblages to reach their present size. Our analyses therefore provide at the same time a broad relative chronological framework of the landscape setting up together with an overview of the spatial patterns of ice-rich permafrost features. It also suggests a number of hypotheses for the development of these landforms; however, further work involving more accurate dating methods is required to constrain these hypotheses. Article in Journal/Newspaper Ice permafrost Université Savoie Mont Blanc: HAL |
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Open Polar |
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Université Savoie Mont Blanc: HAL |
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ftunivsavoie |
language |
English |
description |
International audience The landscapes of the Vallon de la Route and Vallon de Pradieu (France) display typical geomorphological features of the Southern French Alps, with very few or no glaciers but a wide periglacial belt that extends from 2500 to 3100 m a.s.l. These valleys are unusual in that they contain several generations of rock glaciers that, from their rooting zone to their front, have developed in a topoclimatic setting characterised by high mean insolation (southerly aspect) and relatively low altitude. In this work, we determined the present status of these landforms, and more precisely the characteristics of the icy layers within the rock glaciers, via electrical soundings and thermal measurements, which we then combined with field observations. The permafrost zones in both areas are highly fragmented, whereas ground-ice can be present in landforms previously assumed as relict on the basis of their geomorphological characteristics alone. We used an empirical relationship between rock glacier flow velocity and terrain slope to estimate the time needed for both rock glacier assemblages to reach their present size. Our analyses therefore provide at the same time a broad relative chronological framework of the landscape setting up together with an overview of the spatial patterns of ice-rich permafrost features. It also suggests a number of hypotheses for the development of these landforms; however, further work involving more accurate dating methods is required to constrain these hypotheses. |
author2 |
Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Bodin, Xavier |
spellingShingle |
Bodin, Xavier Present status and development of rock glacier complexes in south-faced valleys (45°N, French Alps) |
author_facet |
Bodin, Xavier |
author_sort |
Bodin, Xavier |
title |
Present status and development of rock glacier complexes in south-faced valleys (45°N, French Alps) |
title_short |
Present status and development of rock glacier complexes in south-faced valleys (45°N, French Alps) |
title_full |
Present status and development of rock glacier complexes in south-faced valleys (45°N, French Alps) |
title_fullStr |
Present status and development of rock glacier complexes in south-faced valleys (45°N, French Alps) |
title_full_unstemmed |
Present status and development of rock glacier complexes in south-faced valleys (45°N, French Alps) |
title_sort |
present status and development of rock glacier complexes in south-faced valleys (45°n, french alps) |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/halsde-00948088 https://doi.org/10.4461/GFDQ.2013.36.2 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
ISSN: 0391-9838 Geografia Fisica e Dinamica Quaternaria https://hal.science/halsde-00948088 Geografia Fisica e Dinamica Quaternaria, 2013, 36 (2), pp. 27-28. ⟨10.4461/GFDQ.2013.36.2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.4461/GFDQ.2013.36.2 halsde-00948088 https://hal.science/halsde-00948088 doi:10.4461/GFDQ.2013.36.2 |
op_doi |
https://doi.org/10.4461/GFDQ.2013.36.2 |
_version_ |
1797584475634270208 |