Structure and genesis of the Thabor rock glacier (Northern French Alps) determined from morphological and ground-penetrating radar surveys
International audience Landform analysis and ground-penetrating radar (GPR) were used to investigate the Thabor rock glacier, in the Northern French Alps. The surface features of the rock glacier were classified and described, with emphasis on massive ice exposures. The retreat of the former Thabor...
Published in: | Geomorphology |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2011
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Subjects: | |
Online Access: | https://hal-normandie-univ.archives-ouvertes.fr/hal-01740096 https://doi.org/10.1016/j.geomorph.2011.07.004 |
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ftccsdartic:oai:HAL:hal-01740096v1 |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Rock glacier Ground-penetrating radar Internal structure Glacier–permafrost interactions [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
Rock glacier Ground-penetrating radar Internal structure Glacier–permafrost interactions [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Monnier, Sébastien Camerlynck, Christian REJIBA, Fayçal Kinnard, Christophe Feuillet, Thierry Dhemaied, Amine Structure and genesis of the Thabor rock glacier (Northern French Alps) determined from morphological and ground-penetrating radar surveys |
topic_facet |
Rock glacier Ground-penetrating radar Internal structure Glacier–permafrost interactions [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience Landform analysis and ground-penetrating radar (GPR) were used to investigate the Thabor rock glacier, in the Northern French Alps. The surface features of the rock glacier were classified and described, with emphasis on massive ice exposures. The retreat of the former Thabor glacier since the Little Ice Age (LIA) was documented through an analysis of historical sources, and recent movements of the rock glacier were inferred from orthophoto-based measurements. Two-dimensional (2-D) models of the radar wave velocity were derived from the raw GPR data, using the numerous diffraction hyperbolae for local determinations of the velocity and kriging interpolation techniques. Subsequently, the profiles were migrated through a 2-D Kirchhoff migration method using the interpolated velocities. The 2-D velocity models exhibit pronounced spatial variations and, in several locations, high values (> 0.15 m ns−1) potentially corresponding to massive ice. On the other hand, while the migrated profiles show numerous layers, the internal stratigraphy of the rock glacier is dominated by a few prominent internal boundaries. The integration of morphology, radar wave velocity, and internal stratigraphy allowed us to identify the main structural units of the rock glacier as well as to explain its genesis: the rock glacier was formed by the imbrication of a massive ice core, originating from the retreat of the former Thabor glacier since the LIA, into pre-existing glacial deposits. |
author2 |
Laboratoire de géographie physique : Environnements Quaternaires et Actuels (LGP) Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS) Structure et fonctionnement des systèmes hydriques continentaux (SISYPHE) Université Pierre et Marie Curie - Paris 6 (UPMC)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-MINES ParisTech - École nationale supérieure des mines de Paris Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Centro de Estudios Avanzados en Zonas Aridas (CEAZA) Littoral, Environnement, Télédétection, Géomatique (LETG - Nantes) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Brest (UBO)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN) Université de Nantes (UN)-Université de Nantes (UN) Laboratoire Navier (navier umr 8205) École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) Géotechnique (cermes) École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) |
format |
Article in Journal/Newspaper |
author |
Monnier, Sébastien Camerlynck, Christian REJIBA, Fayçal Kinnard, Christophe Feuillet, Thierry Dhemaied, Amine |
author_facet |
Monnier, Sébastien Camerlynck, Christian REJIBA, Fayçal Kinnard, Christophe Feuillet, Thierry Dhemaied, Amine |
author_sort |
Monnier, Sébastien |
title |
Structure and genesis of the Thabor rock glacier (Northern French Alps) determined from morphological and ground-penetrating radar surveys |
title_short |
Structure and genesis of the Thabor rock glacier (Northern French Alps) determined from morphological and ground-penetrating radar surveys |
title_full |
Structure and genesis of the Thabor rock glacier (Northern French Alps) determined from morphological and ground-penetrating radar surveys |
title_fullStr |
Structure and genesis of the Thabor rock glacier (Northern French Alps) determined from morphological and ground-penetrating radar surveys |
title_full_unstemmed |
Structure and genesis of the Thabor rock glacier (Northern French Alps) determined from morphological and ground-penetrating radar surveys |
title_sort |
structure and genesis of the thabor rock glacier (northern french alps) determined from morphological and ground-penetrating radar surveys |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal-normandie-univ.archives-ouvertes.fr/hal-01740096 https://doi.org/10.1016/j.geomorph.2011.07.004 |
genre |
Ice ice core permafrost |
genre_facet |
Ice ice core permafrost |
op_source |
ISSN: 0169-555X Geomorphology https://hal-normandie-univ.archives-ouvertes.fr/hal-01740096 Geomorphology, Elsevier, 2011, 134 (3-4), pp.269-279. ⟨10.1016/j.geomorph.2011.07.004⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geomorph.2011.07.004 hal-01740096 https://hal-normandie-univ.archives-ouvertes.fr/hal-01740096 doi:10.1016/j.geomorph.2011.07.004 |
op_doi |
https://doi.org/10.1016/j.geomorph.2011.07.004 |
container_title |
Geomorphology |
container_volume |
134 |
container_issue |
3-4 |
container_start_page |
269 |
op_container_end_page |
279 |
_version_ |
1766027886432616448 |
spelling |
ftccsdartic:oai:HAL:hal-01740096v1 2023-05-15T16:37:35+02:00 Structure and genesis of the Thabor rock glacier (Northern French Alps) determined from morphological and ground-penetrating radar surveys Monnier, Sébastien Camerlynck, Christian REJIBA, Fayçal Kinnard, Christophe Feuillet, Thierry Dhemaied, Amine Laboratoire de géographie physique : Environnements Quaternaires et Actuels (LGP) Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS) Structure et fonctionnement des systèmes hydriques continentaux (SISYPHE) Université Pierre et Marie Curie - Paris 6 (UPMC)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-MINES ParisTech - École nationale supérieure des mines de Paris Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Centro de Estudios Avanzados en Zonas Aridas (CEAZA) Littoral, Environnement, Télédétection, Géomatique (LETG - Nantes) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Brest (UBO)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN) Université de Nantes (UN)-Université de Nantes (UN) Laboratoire Navier (navier umr 8205) École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) Géotechnique (cermes) École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) 2011 https://hal-normandie-univ.archives-ouvertes.fr/hal-01740096 https://doi.org/10.1016/j.geomorph.2011.07.004 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geomorph.2011.07.004 hal-01740096 https://hal-normandie-univ.archives-ouvertes.fr/hal-01740096 doi:10.1016/j.geomorph.2011.07.004 ISSN: 0169-555X Geomorphology https://hal-normandie-univ.archives-ouvertes.fr/hal-01740096 Geomorphology, Elsevier, 2011, 134 (3-4), pp.269-279. ⟨10.1016/j.geomorph.2011.07.004⟩ Rock glacier Ground-penetrating radar Internal structure Glacier–permafrost interactions [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2011 ftccsdartic https://doi.org/10.1016/j.geomorph.2011.07.004 2021-12-26T00:02:11Z International audience Landform analysis and ground-penetrating radar (GPR) were used to investigate the Thabor rock glacier, in the Northern French Alps. The surface features of the rock glacier were classified and described, with emphasis on massive ice exposures. The retreat of the former Thabor glacier since the Little Ice Age (LIA) was documented through an analysis of historical sources, and recent movements of the rock glacier were inferred from orthophoto-based measurements. Two-dimensional (2-D) models of the radar wave velocity were derived from the raw GPR data, using the numerous diffraction hyperbolae for local determinations of the velocity and kriging interpolation techniques. Subsequently, the profiles were migrated through a 2-D Kirchhoff migration method using the interpolated velocities. The 2-D velocity models exhibit pronounced spatial variations and, in several locations, high values (> 0.15 m ns−1) potentially corresponding to massive ice. On the other hand, while the migrated profiles show numerous layers, the internal stratigraphy of the rock glacier is dominated by a few prominent internal boundaries. The integration of morphology, radar wave velocity, and internal stratigraphy allowed us to identify the main structural units of the rock glacier as well as to explain its genesis: the rock glacier was formed by the imbrication of a massive ice core, originating from the retreat of the former Thabor glacier since the LIA, into pre-existing glacial deposits. Article in Journal/Newspaper Ice ice core permafrost Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Geomorphology 134 3-4 269 279 |