Glacier thickness estimations of alpine glaciers using data and modeling constraints
Advanced knowledge of the ice thickness distribution within glaciers is of fundamental importance for several purposes, such as water resource management and the study of the impact of climate change. Ice thicknesses can be modeled using ice surface features, but the resulting models can be prone to...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/361623 2023-05-15T18:32:14+02:00 Glacier thickness estimations of alpine glaciers using data and modeling constraints Langhammer, Lisbeth Grab, Melchior Bauder, Andreas Maurer, Hansruedi 2019 application/application/pdf https://hdl.handle.net/20.500.11850/361623 https://doi.org/10.3929/ethz-b-000361623 en eng Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-13-2189-2019 info:eu-repo/semantics/altIdentifier/wos/000481989700002 http://hdl.handle.net/20.500.11850/361623 doi:10.3929/ethz-b-000361623 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY The Cryosphere, 13 (8) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 ftethz https://doi.org/20.500.11850/361623 https://doi.org/10.3929/ethz-b-000361623 https://doi.org/10.5194/tc-13-2189-2019 2022-04-25T13:54:01Z Advanced knowledge of the ice thickness distribution within glaciers is of fundamental importance for several purposes, such as water resource management and the study of the impact of climate change. Ice thicknesses can be modeled using ice surface features, but the resulting models can be prone to considerable uncertainties. Alternatively, it is possible to measure ice thicknesses, for example, with ground-penetrating radar (GPR). Such measurements are typically restricted to a few profiles, with which it is not possible to obtain spatially unaliased subsurface images. We developed the Glacier Thickness Estimation algorithm (GlaTE), which optimally combines modeling results and measured ice thicknesses in an inversion procedure to obtain overall thickness distributions. GlaTE offers the flexibility of being able to add any existing modeling algorithm, and any further constraints can be added in a straightforward manner. Furthermore, it accounts for the uncertainties associated with the individual constraints. Properties and benefits of GlaTE are demonstrated with three case studies performed on different types of alpine glaciers. In all three cases, subsurface models could be found that are consistent with glaciological modeling and GPR data constraints. Since acquiring GPR data on glaciers can be an expensive endeavor, we additionally employed elements of sequential optimized experimental design (SOED) for determining cost-optimized GPR survey layouts. The calculated cost–benefit curves indicate that a relatively large amount of data can be acquired before redundant information is collected with any additional profiles, and it becomes increasingly expensive to obtain further information. ISSN:1994-0416 ISSN:1994-0424 Article in Journal/Newspaper The Cryosphere ETH Zürich Research Collection |
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Open Polar |
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ETH Zürich Research Collection |
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ftethz |
language |
English |
description |
Advanced knowledge of the ice thickness distribution within glaciers is of fundamental importance for several purposes, such as water resource management and the study of the impact of climate change. Ice thicknesses can be modeled using ice surface features, but the resulting models can be prone to considerable uncertainties. Alternatively, it is possible to measure ice thicknesses, for example, with ground-penetrating radar (GPR). Such measurements are typically restricted to a few profiles, with which it is not possible to obtain spatially unaliased subsurface images. We developed the Glacier Thickness Estimation algorithm (GlaTE), which optimally combines modeling results and measured ice thicknesses in an inversion procedure to obtain overall thickness distributions. GlaTE offers the flexibility of being able to add any existing modeling algorithm, and any further constraints can be added in a straightforward manner. Furthermore, it accounts for the uncertainties associated with the individual constraints. Properties and benefits of GlaTE are demonstrated with three case studies performed on different types of alpine glaciers. In all three cases, subsurface models could be found that are consistent with glaciological modeling and GPR data constraints. Since acquiring GPR data on glaciers can be an expensive endeavor, we additionally employed elements of sequential optimized experimental design (SOED) for determining cost-optimized GPR survey layouts. The calculated cost–benefit curves indicate that a relatively large amount of data can be acquired before redundant information is collected with any additional profiles, and it becomes increasingly expensive to obtain further information. ISSN:1994-0416 ISSN:1994-0424 |
format |
Article in Journal/Newspaper |
author |
Langhammer, Lisbeth Grab, Melchior Bauder, Andreas Maurer, Hansruedi |
spellingShingle |
Langhammer, Lisbeth Grab, Melchior Bauder, Andreas Maurer, Hansruedi Glacier thickness estimations of alpine glaciers using data and modeling constraints |
author_facet |
Langhammer, Lisbeth Grab, Melchior Bauder, Andreas Maurer, Hansruedi |
author_sort |
Langhammer, Lisbeth |
title |
Glacier thickness estimations of alpine glaciers using data and modeling constraints |
title_short |
Glacier thickness estimations of alpine glaciers using data and modeling constraints |
title_full |
Glacier thickness estimations of alpine glaciers using data and modeling constraints |
title_fullStr |
Glacier thickness estimations of alpine glaciers using data and modeling constraints |
title_full_unstemmed |
Glacier thickness estimations of alpine glaciers using data and modeling constraints |
title_sort |
glacier thickness estimations of alpine glaciers using data and modeling constraints |
publisher |
Copernicus |
publishDate |
2019 |
url |
https://hdl.handle.net/20.500.11850/361623 https://doi.org/10.3929/ethz-b-000361623 |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_source |
The Cryosphere, 13 (8) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-13-2189-2019 info:eu-repo/semantics/altIdentifier/wos/000481989700002 http://hdl.handle.net/20.500.11850/361623 doi:10.3929/ethz-b-000361623 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/361623 https://doi.org/10.3929/ethz-b-000361623 https://doi.org/10.5194/tc-13-2189-2019 |
_version_ |
1766216316131213312 |