Surface velocity fields of active rock glaciers and ice‐debris complexes in the Central Andes of Argentina
Rock glaciers and transitional ice‐debris complexes predominate the Central Andean landform assemblage, yet regional studies on their state of activity and their kinematics remain sparse. Here we utilize the national glacier inventory of Argentina to quantify surface velocity fields of 244 rock glac...
Published in: | Earth Surface Processes and Landforms |
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ftsubggeo:oai:e-docs.geo-leo.de:11858/8363 2024-06-09T07:46:39+00:00 Surface velocity fields of active rock glaciers and ice‐debris complexes in the Central Andes of Argentina Blöthe, Jan Henrik Halla, Christian Schwalbe, Ellen Bottegal, Estefania Trombotto Liaudat, Dario Schrott, Lothar 2 Department of Geography University of Bonn Bonn Germany 3 Institute of Photogrammetry and Remote Sensing, Technische Universität Dresden Dresden Germany 4 Geocryology, Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales, CCT CONICET Mendoza Argentina 2020-12-30 https://doi.org/10.23689/fidgeo-4023 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8363 eng eng doi:10.23689/fidgeo-4023 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8363 This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. ddc:551.31 rock glaciers ice‐debris complexes permafrost feature tracking centreline modelling random forests Central Andes RapidEye doc-type:article 2020 ftsubggeo https://doi.org/10.23689/fidgeo-4023 2024-05-10T04:58:51Z Rock glaciers and transitional ice‐debris complexes predominate the Central Andean landform assemblage, yet regional studies on their state of activity and their kinematics remain sparse. Here we utilize the national glacier inventory of Argentina to quantify surface velocity fields of 244 rock glaciers and 51 ice‐debris complexes, located in the Cordón del Plata range, Argentina. Applying a feature‐tracking approach to repeated RapidEye satellite imagery acquired between 2010 and 2017/18, we find mean displacement rates between 0.37 and 2.61 m year−1 for 149 landforms, while for the remaining 146 features, surface movement remains below our level of detection. We compare our satellite‐derived velocity fields with ground‐truth data from two local field sites and find closely matching results in magnitude and spatial distribution. With average displacement of one‐third of the active rock glaciers and ice‐debris complexes exceeding 1 m year−1, the region hosts an exceptional number of fast‐flowing periglacial landforms, compared to other mountain belts. Using a random forest model, we test the predictive power of 25 morphometric and topoclimatic candidate predictors for modelling the state of activity of rock glaciers and ice‐debris complexes on two different scales. For entire landforms and individual landform segments, constructed along displacement centrelines, we can predict the state of activity with overall accuracies of 70.08% (mean AUROC = 0.785) and 74.86% (mean AUROC = 0.753), respectively. While topoclimatic parameters such as solar radiation and elevation are most important for entire landforms, geometric parameters become more important at the scale of landform segments. Despite tentative correlations between local slope and surface kinematics, our results point to factors integrating slope and distance to the source to govern local deformation. We conclude that feature tracking in optical imagery is feasible for regional studies in remote regions and provides valuable insight into the current state ... Article in Journal/Newspaper Ice permafrost GEO-LEOe-docs (FID GEO) Argentina Earth Surface Processes and Landforms 46 2 504 522 |
institution |
Open Polar |
collection |
GEO-LEOe-docs (FID GEO) |
op_collection_id |
ftsubggeo |
language |
English |
topic |
ddc:551.31 rock glaciers ice‐debris complexes permafrost feature tracking centreline modelling random forests Central Andes RapidEye |
spellingShingle |
ddc:551.31 rock glaciers ice‐debris complexes permafrost feature tracking centreline modelling random forests Central Andes RapidEye Blöthe, Jan Henrik Halla, Christian Schwalbe, Ellen Bottegal, Estefania Trombotto Liaudat, Dario Schrott, Lothar 2 Department of Geography University of Bonn Bonn Germany 3 Institute of Photogrammetry and Remote Sensing, Technische Universität Dresden Dresden Germany 4 Geocryology, Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales, CCT CONICET Mendoza Argentina Surface velocity fields of active rock glaciers and ice‐debris complexes in the Central Andes of Argentina |
topic_facet |
ddc:551.31 rock glaciers ice‐debris complexes permafrost feature tracking centreline modelling random forests Central Andes RapidEye |
description |
Rock glaciers and transitional ice‐debris complexes predominate the Central Andean landform assemblage, yet regional studies on their state of activity and their kinematics remain sparse. Here we utilize the national glacier inventory of Argentina to quantify surface velocity fields of 244 rock glaciers and 51 ice‐debris complexes, located in the Cordón del Plata range, Argentina. Applying a feature‐tracking approach to repeated RapidEye satellite imagery acquired between 2010 and 2017/18, we find mean displacement rates between 0.37 and 2.61 m year−1 for 149 landforms, while for the remaining 146 features, surface movement remains below our level of detection. We compare our satellite‐derived velocity fields with ground‐truth data from two local field sites and find closely matching results in magnitude and spatial distribution. With average displacement of one‐third of the active rock glaciers and ice‐debris complexes exceeding 1 m year−1, the region hosts an exceptional number of fast‐flowing periglacial landforms, compared to other mountain belts. Using a random forest model, we test the predictive power of 25 morphometric and topoclimatic candidate predictors for modelling the state of activity of rock glaciers and ice‐debris complexes on two different scales. For entire landforms and individual landform segments, constructed along displacement centrelines, we can predict the state of activity with overall accuracies of 70.08% (mean AUROC = 0.785) and 74.86% (mean AUROC = 0.753), respectively. While topoclimatic parameters such as solar radiation and elevation are most important for entire landforms, geometric parameters become more important at the scale of landform segments. Despite tentative correlations between local slope and surface kinematics, our results point to factors integrating slope and distance to the source to govern local deformation. We conclude that feature tracking in optical imagery is feasible for regional studies in remote regions and provides valuable insight into the current state ... |
format |
Article in Journal/Newspaper |
author |
Blöthe, Jan Henrik Halla, Christian Schwalbe, Ellen Bottegal, Estefania Trombotto Liaudat, Dario Schrott, Lothar 2 Department of Geography University of Bonn Bonn Germany 3 Institute of Photogrammetry and Remote Sensing, Technische Universität Dresden Dresden Germany 4 Geocryology, Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales, CCT CONICET Mendoza Argentina |
author_facet |
Blöthe, Jan Henrik Halla, Christian Schwalbe, Ellen Bottegal, Estefania Trombotto Liaudat, Dario Schrott, Lothar 2 Department of Geography University of Bonn Bonn Germany 3 Institute of Photogrammetry and Remote Sensing, Technische Universität Dresden Dresden Germany 4 Geocryology, Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales, CCT CONICET Mendoza Argentina |
author_sort |
Blöthe, Jan Henrik |
title |
Surface velocity fields of active rock glaciers and ice‐debris complexes in the Central Andes of Argentina |
title_short |
Surface velocity fields of active rock glaciers and ice‐debris complexes in the Central Andes of Argentina |
title_full |
Surface velocity fields of active rock glaciers and ice‐debris complexes in the Central Andes of Argentina |
title_fullStr |
Surface velocity fields of active rock glaciers and ice‐debris complexes in the Central Andes of Argentina |
title_full_unstemmed |
Surface velocity fields of active rock glaciers and ice‐debris complexes in the Central Andes of Argentina |
title_sort |
surface velocity fields of active rock glaciers and ice‐debris complexes in the central andes of argentina |
publishDate |
2020 |
url |
https://doi.org/10.23689/fidgeo-4023 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8363 |
geographic |
Argentina |
geographic_facet |
Argentina |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_relation |
doi:10.23689/fidgeo-4023 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8363 |
op_rights |
This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. |
op_doi |
https://doi.org/10.23689/fidgeo-4023 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
46 |
container_issue |
2 |
container_start_page |
504 |
op_container_end_page |
522 |
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1801376615649771520 |