Where does a glacier end? GPR measurements to identify the limits between valley slopes and actual glacier body. Application to the Austre Lovénbreen, Spitsbergen
International audience Glacier limits are usually mapped according to a spatial discrimination based on color of remote sensing images or aerial photography. What appears like ice (white or light colored areas) at the end of the ablation period (end of summer) corresponds to the glacier, while what...
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ftccsdartic:oai:HAL:hal-03222066v1 2023-05-15T15:13:12+02:00 Where does a glacier end? GPR measurements to identify the limits between valley slopes and actual glacier body. Application to the Austre Lovénbreen, Spitsbergen Bernard, Eric Friedt, Jean-Michel Saintenoy, Albane Tolle, Florian Griselin, Madeleine Marlin, Christelle Théoriser et modéliser pour aménager (UMR 6049) (ThéMA) Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB) Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST) Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC)-Centre National de la Recherche Scientifique (CNRS) Interactions et dynamique des environnements de surface (IDES) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2014 https://hal.archives-ouvertes.fr/hal-03222066 en eng HAL CCSD hal-03222066 https://hal.archives-ouvertes.fr/hal-03222066 International Journal of Applied Earth Observation and Geoinformation https://hal.archives-ouvertes.fr/hal-03222066 International Journal of Applied Earth Observation and Geoinformation, 2014, 27 (Part A), pp.100 - 108 [SPI.OTHER]Engineering Sciences [physics]/Other info:eu-repo/semantics/article Journal articles 2014 ftccsdartic 2021-05-15T22:25:47Z International audience Glacier limits are usually mapped according to a spatial discrimination based on color of remote sensing images or aerial photography. What appears like ice (white or light colored areas) at the end of the ablation period (end of summer) corresponds to the glacier, while what appears as rock (dark areas) is identified as the slope. This kind of visual discretization seems to be insufficient in the case of small arctic glaciers. Indeed, the slopes have been described as very unstable parts of glacial basins. Debris are generated by the inclination of the slopes, and reach the glacier surface. Thus, the visible limit does not correspond to the ice extension: a significant amount of ice is potentially covered by rock debris, enlarging the actual glacier surface with respect to the observed area. Hence, we apply Ground Penetrating Radar (GPR) measurements for mapping, beyond the central parts of the glacier, the steep slopes of the Austre Lovénbreen (Spitsbergen, 79° N). The aim is to assess the discrepancy between the limits extracted from remote sensing methods – aerial photography, satellite images and derived digital elevation models – and the GPR data which exhibit significant ice thickness at locations considered outside the glacier itself. The ice is observed to extend typically from 25 to 30 m, and up to 100 m, under the slopes. These measurements allow for a new determination of the rock/ice interface location following criteria beyond the visual and morphological characteristics seen from the surface, as obtained by remote sensing techniques or in-situ observations. Article in Journal/Newspaper Arctic Spitsbergen Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic |
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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 |
[SPI.OTHER]Engineering Sciences [physics]/Other |
spellingShingle |
[SPI.OTHER]Engineering Sciences [physics]/Other Bernard, Eric Friedt, Jean-Michel Saintenoy, Albane Tolle, Florian Griselin, Madeleine Marlin, Christelle Where does a glacier end? GPR measurements to identify the limits between valley slopes and actual glacier body. Application to the Austre Lovénbreen, Spitsbergen |
topic_facet |
[SPI.OTHER]Engineering Sciences [physics]/Other |
description |
International audience Glacier limits are usually mapped according to a spatial discrimination based on color of remote sensing images or aerial photography. What appears like ice (white or light colored areas) at the end of the ablation period (end of summer) corresponds to the glacier, while what appears as rock (dark areas) is identified as the slope. This kind of visual discretization seems to be insufficient in the case of small arctic glaciers. Indeed, the slopes have been described as very unstable parts of glacial basins. Debris are generated by the inclination of the slopes, and reach the glacier surface. Thus, the visible limit does not correspond to the ice extension: a significant amount of ice is potentially covered by rock debris, enlarging the actual glacier surface with respect to the observed area. Hence, we apply Ground Penetrating Radar (GPR) measurements for mapping, beyond the central parts of the glacier, the steep slopes of the Austre Lovénbreen (Spitsbergen, 79° N). The aim is to assess the discrepancy between the limits extracted from remote sensing methods – aerial photography, satellite images and derived digital elevation models – and the GPR data which exhibit significant ice thickness at locations considered outside the glacier itself. The ice is observed to extend typically from 25 to 30 m, and up to 100 m, under the slopes. These measurements allow for a new determination of the rock/ice interface location following criteria beyond the visual and morphological characteristics seen from the surface, as obtained by remote sensing techniques or in-situ observations. |
author2 |
Théoriser et modéliser pour aménager (UMR 6049) (ThéMA) Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB) Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST) Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC)-Centre National de la Recherche Scientifique (CNRS) Interactions et dynamique des environnements de surface (IDES) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Bernard, Eric Friedt, Jean-Michel Saintenoy, Albane Tolle, Florian Griselin, Madeleine Marlin, Christelle |
author_facet |
Bernard, Eric Friedt, Jean-Michel Saintenoy, Albane Tolle, Florian Griselin, Madeleine Marlin, Christelle |
author_sort |
Bernard, Eric |
title |
Where does a glacier end? GPR measurements to identify the limits between valley slopes and actual glacier body. Application to the Austre Lovénbreen, Spitsbergen |
title_short |
Where does a glacier end? GPR measurements to identify the limits between valley slopes and actual glacier body. Application to the Austre Lovénbreen, Spitsbergen |
title_full |
Where does a glacier end? GPR measurements to identify the limits between valley slopes and actual glacier body. Application to the Austre Lovénbreen, Spitsbergen |
title_fullStr |
Where does a glacier end? GPR measurements to identify the limits between valley slopes and actual glacier body. Application to the Austre Lovénbreen, Spitsbergen |
title_full_unstemmed |
Where does a glacier end? GPR measurements to identify the limits between valley slopes and actual glacier body. Application to the Austre Lovénbreen, Spitsbergen |
title_sort |
where does a glacier end? gpr measurements to identify the limits between valley slopes and actual glacier body. application to the austre lovénbreen, spitsbergen |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.archives-ouvertes.fr/hal-03222066 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Spitsbergen |
genre_facet |
Arctic Spitsbergen |
op_source |
International Journal of Applied Earth Observation and Geoinformation https://hal.archives-ouvertes.fr/hal-03222066 International Journal of Applied Earth Observation and Geoinformation, 2014, 27 (Part A), pp.100 - 108 |
op_relation |
hal-03222066 https://hal.archives-ouvertes.fr/hal-03222066 |
_version_ |
1766343785674964992 |