Morphological diversity, formation and evolution of subglacial bedforms : implications for the understanding of ice-meltwater-bed interactions
Considering the inaccessibility of modern subglacial environments, bedforms discovered after the retreat of ice sheets are critical relics of subglacial processes. Their thorough investigation allows the relationships between the characteristics of ice flow dynamics, subglacial hydrology and subglac...
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Other Authors: | , , , , , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2022
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Online Access: | https://theses.hal.science/tel-03971961 https://theses.hal.science/tel-03971961/document https://theses.hal.science/tel-03971961/file/2022LEMA1041.pdf |
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Portail des publications scientifiques de l’Université d’Angers (HAL) |
op_collection_id |
ftunivangershal |
language |
French |
topic |
Geomorphology Analog modeling Subglacial bedforms Ice sheet Ice streams Subglacial meltwater routes Géomorphologie Modélisation analogique Bedforms sous-glaciaires Calottes glaciaires Fleuves de glace Routes de drainage sous-glaciaires [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
Geomorphology Analog modeling Subglacial bedforms Ice sheet Ice streams Subglacial meltwater routes Géomorphologie Modélisation analogique Bedforms sous-glaciaires Calottes glaciaires Fleuves de glace Routes de drainage sous-glaciaires [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Verité, Jean Morphological diversity, formation and evolution of subglacial bedforms : implications for the understanding of ice-meltwater-bed interactions |
topic_facet |
Geomorphology Analog modeling Subglacial bedforms Ice sheet Ice streams Subglacial meltwater routes Géomorphologie Modélisation analogique Bedforms sous-glaciaires Calottes glaciaires Fleuves de glace Routes de drainage sous-glaciaires [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
Considering the inaccessibility of modern subglacial environments, bedforms discovered after the retreat of ice sheets are critical relics of subglacial processes. Their thorough investigation allows the relationships between the characteristics of ice flow dynamics, subglacial hydrology and subglacial sediments to be unraveled. This work presents a new method for studying subglacial bedforms combining analog modeling and glacial geomorphology. We developed an innovative morphometric analysis enlightening the diversity of subglacial bedforms and morphological continuums (i) between ribbed bedforms, sinuous/oblique bedforms and streamlined bedforms and (ii) between ribbed bedforms, proto-murtoos and murtoos. These bedform continuums highlight several morphological evolutionary sequences controlled by (i) the quantity and directions of deformation transmitted to the bed by the ice flow and (ii) the degree of remobilization induced by meltwater flow. Considering the spatio-temporal variations of ice-meltwater-bed interactions and deformation, erosion and deposition processes at the base of ice sheets, a unifying evolutionary model is proposed to explain the formation of the most subglacial bedforms currently observed. En raison de l’inaccessibilité des environnements sous-glaciaires actuels, les bedforms découverts après le retrait glaciaire constituent d’excellents témoins interactions glace-eau-sédiments. Leur étude permet notamment d’appréhender les relations entre les caractéristiques de la dynamique d’écoulement de la glace, de l’hydrologie sous-glaciaire et des sédiments sous-glaciaires. Ce travail présente une nouvelle méthode d’étude des bedforms sous-glaciaires combinant la modélisation analogique et de la géomorphologie glaciaire. Au travers d’une analyse morphométrique inédite permettant de caractériser la diversité des bedforms, deux continuums morphologiques ont été découverts (i) entre les ribbed bedforms, les bedforms sinueux/obliques et les linéations glaciaires et (ii) entre les ribbed bedforms, ... |
author2 |
Laboratoire de Planétologie et Géosciences - Le Mans (LPG - Le Mans) Laboratoire de Planétologie et Géosciences UMR_C 6112 (LPG) Le Mans Université (UM)-Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST) Nantes Université - pôle Sciences et technologie Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Le Mans Université (UM)-Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST) Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ) Le Mans Université Régis Mourgues Edouard Ravier Olivier Bourgeois |
format |
Doctoral or Postdoctoral Thesis |
author |
Verité, Jean |
author_facet |
Verité, Jean |
author_sort |
Verité, Jean |
title |
Morphological diversity, formation and evolution of subglacial bedforms : implications for the understanding of ice-meltwater-bed interactions |
title_short |
Morphological diversity, formation and evolution of subglacial bedforms : implications for the understanding of ice-meltwater-bed interactions |
title_full |
Morphological diversity, formation and evolution of subglacial bedforms : implications for the understanding of ice-meltwater-bed interactions |
title_fullStr |
Morphological diversity, formation and evolution of subglacial bedforms : implications for the understanding of ice-meltwater-bed interactions |
title_full_unstemmed |
Morphological diversity, formation and evolution of subglacial bedforms : implications for the understanding of ice-meltwater-bed interactions |
title_sort |
morphological diversity, formation and evolution of subglacial bedforms : implications for the understanding of ice-meltwater-bed interactions |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://theses.hal.science/tel-03971961 https://theses.hal.science/tel-03971961/document https://theses.hal.science/tel-03971961/file/2022LEMA1041.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
https://theses.hal.science/tel-03971961 Géomorphologie. Le Mans Université, 2022. Français. ⟨NNT : 2022LEMA1041⟩ |
op_relation |
NNT: 2022LEMA1041 tel-03971961 https://theses.hal.science/tel-03971961 https://theses.hal.science/tel-03971961/document https://theses.hal.science/tel-03971961/file/2022LEMA1041.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1790601687988174848 |
spelling |
ftunivangershal:oai:HAL:tel-03971961v1 2024-02-11T10:04:55+01:00 Morphological diversity, formation and evolution of subglacial bedforms : implications for the understanding of ice-meltwater-bed interactions Diversité morphologique, formation et évolution des bedforms sous-glaciaires : implications pour la compréhension des interactions glace-eau-sédiments Verité, Jean Laboratoire de Planétologie et Géosciences - Le Mans (LPG - Le Mans) Laboratoire de Planétologie et Géosciences UMR_C 6112 (LPG) Le Mans Université (UM)-Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST) Nantes Université - pôle Sciences et technologie Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Le Mans Université (UM)-Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST) Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ) Le Mans Université Régis Mourgues Edouard Ravier Olivier Bourgeois 2022-12-08 https://theses.hal.science/tel-03971961 https://theses.hal.science/tel-03971961/document https://theses.hal.science/tel-03971961/file/2022LEMA1041.pdf fr fre HAL CCSD NNT: 2022LEMA1041 tel-03971961 https://theses.hal.science/tel-03971961 https://theses.hal.science/tel-03971961/document https://theses.hal.science/tel-03971961/file/2022LEMA1041.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-03971961 Géomorphologie. Le Mans Université, 2022. Français. ⟨NNT : 2022LEMA1041⟩ Geomorphology Analog modeling Subglacial bedforms Ice sheet Ice streams Subglacial meltwater routes Géomorphologie Modélisation analogique Bedforms sous-glaciaires Calottes glaciaires Fleuves de glace Routes de drainage sous-glaciaires [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/doctoralThesis Theses 2022 ftunivangershal 2024-01-24T17:20:35Z Considering the inaccessibility of modern subglacial environments, bedforms discovered after the retreat of ice sheets are critical relics of subglacial processes. Their thorough investigation allows the relationships between the characteristics of ice flow dynamics, subglacial hydrology and subglacial sediments to be unraveled. This work presents a new method for studying subglacial bedforms combining analog modeling and glacial geomorphology. We developed an innovative morphometric analysis enlightening the diversity of subglacial bedforms and morphological continuums (i) between ribbed bedforms, sinuous/oblique bedforms and streamlined bedforms and (ii) between ribbed bedforms, proto-murtoos and murtoos. These bedform continuums highlight several morphological evolutionary sequences controlled by (i) the quantity and directions of deformation transmitted to the bed by the ice flow and (ii) the degree of remobilization induced by meltwater flow. Considering the spatio-temporal variations of ice-meltwater-bed interactions and deformation, erosion and deposition processes at the base of ice sheets, a unifying evolutionary model is proposed to explain the formation of the most subglacial bedforms currently observed. En raison de l’inaccessibilité des environnements sous-glaciaires actuels, les bedforms découverts après le retrait glaciaire constituent d’excellents témoins interactions glace-eau-sédiments. Leur étude permet notamment d’appréhender les relations entre les caractéristiques de la dynamique d’écoulement de la glace, de l’hydrologie sous-glaciaire et des sédiments sous-glaciaires. Ce travail présente une nouvelle méthode d’étude des bedforms sous-glaciaires combinant la modélisation analogique et de la géomorphologie glaciaire. Au travers d’une analyse morphométrique inédite permettant de caractériser la diversité des bedforms, deux continuums morphologiques ont été découverts (i) entre les ribbed bedforms, les bedforms sinueux/obliques et les linéations glaciaires et (ii) entre les ribbed bedforms, ... Doctoral or Postdoctoral Thesis Ice Sheet Portail des publications scientifiques de l’Université d’Angers (HAL) |