Determining the evolution of an alpine glacier drainage system by solving inverse problems
Our understanding of the subglacial drainage system has improved markedly over the last decades due to field observations and numerical modelling. However, integrating data into increasingly complex numerical models remain challenging. Here we infer two-dimensional subglacial channel networks and hy...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | https://serval.unil.ch/notice/serval:BIB_2EA1F92FFA4F https://doi.org/10.1017/jog.2020.116 https://serval.unil.ch/resource/serval:BIB_2EA1F92FFA4F.P001/REF.pdf http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:ch:serval-BIB_2EA1F92FFA4F6 |
id |
ftunivlausanne:oai:serval.unil.ch:BIB_2EA1F92FFA4F |
---|---|
record_format |
openpolar |
spelling |
ftunivlausanne:oai:serval.unil.ch:BIB_2EA1F92FFA4F 2024-02-11T10:05:23+01:00 Determining the evolution of an alpine glacier drainage system by solving inverse problems Irarrazaval, Inigo Werder, Mauro A. Huss, Matthias Herman, Frederic Mariethoz, Gregoire 2021-06 application/pdf https://serval.unil.ch/notice/serval:BIB_2EA1F92FFA4F https://doi.org/10.1017/jog.2020.116 https://serval.unil.ch/resource/serval:BIB_2EA1F92FFA4F.P001/REF.pdf http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:ch:serval-BIB_2EA1F92FFA4F6 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2020.116 info:eu-repo/semantics/altIdentifier/pissn/0022-1430 info:eu-repo/semantics/altIdentifier/pissn/1727-5652 info:eu-repo/semantics/altIdentifier/urn/urn:nbn:ch:serval-BIB_2EA1F92FFA4F6 https://serval.unil.ch/notice/serval:BIB_2EA1F92FFA4F doi:10.1017/jog.2020.116 https://doi.org/10.1017/jog.2020.116 https://serval.unil.ch/resource/serval:BIB_2EA1F92FFA4F.P001/REF.pdf http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:ch:serval-BIB_2EA1F92FFA4F6 info:eu-repo/semantics/openAccess CC BY-NC-ND 4.0 https://creativecommons.org/licenses/by-nc-nd/4.0/ Journal of Glaciology, vol. 67, no. 263, pp. 421-434 Glacier modelling glaciological instruments and methods subglacial processes info:eu-repo/semantics/article article info:eu-repo/semantics/submittedVersion 2021 ftunivlausanne https://doi.org/10.1017/jog.2020.116 2024-01-22T01:15:00Z Our understanding of the subglacial drainage system has improved markedly over the last decades due to field observations and numerical modelling. However, integrating data into increasingly complex numerical models remain challenging. Here we infer two-dimensional subglacial channel networks and hydraulic parameters for Gorner Glacier, Switzerland, based on available field data at five specific times (snapshots) across the melt season of 2005. The field dataset is one of the most complete available, including borehole water pressure, tracer experiments and meteorological variables. Yet, these observations are still too sparse to fully characterize the drainage system and thus, a unique solution is neither expected nor desirable. We use a geostatistical generator and a steady-state water flow model to produce a set of subglacial channel networks that are consistent with measured water pressure and tracer-transit times. Field data are used to infer hydraulic and morphological parameters of the channels under the assumption that the location of channels persists during the melt season. Results indicate that it is possible to identify locations where subglacial channels are more likely. In addition, we show that different network structures can equally satisfy the field data, which support the use of a stochastic approach to infer unobserved subglacial features. Article in Journal/Newspaper Journal of Glaciology Université de Lausanne (UNIL): Serval - Serveur académique lausannois Journal of Glaciology 67 263 421 434 |
institution |
Open Polar |
collection |
Université de Lausanne (UNIL): Serval - Serveur académique lausannois |
op_collection_id |
ftunivlausanne |
language |
English |
topic |
Glacier modelling glaciological instruments and methods subglacial processes |
spellingShingle |
Glacier modelling glaciological instruments and methods subglacial processes Irarrazaval, Inigo Werder, Mauro A. Huss, Matthias Herman, Frederic Mariethoz, Gregoire Determining the evolution of an alpine glacier drainage system by solving inverse problems |
topic_facet |
Glacier modelling glaciological instruments and methods subglacial processes |
description |
Our understanding of the subglacial drainage system has improved markedly over the last decades due to field observations and numerical modelling. However, integrating data into increasingly complex numerical models remain challenging. Here we infer two-dimensional subglacial channel networks and hydraulic parameters for Gorner Glacier, Switzerland, based on available field data at five specific times (snapshots) across the melt season of 2005. The field dataset is one of the most complete available, including borehole water pressure, tracer experiments and meteorological variables. Yet, these observations are still too sparse to fully characterize the drainage system and thus, a unique solution is neither expected nor desirable. We use a geostatistical generator and a steady-state water flow model to produce a set of subglacial channel networks that are consistent with measured water pressure and tracer-transit times. Field data are used to infer hydraulic and morphological parameters of the channels under the assumption that the location of channels persists during the melt season. Results indicate that it is possible to identify locations where subglacial channels are more likely. In addition, we show that different network structures can equally satisfy the field data, which support the use of a stochastic approach to infer unobserved subglacial features. |
format |
Article in Journal/Newspaper |
author |
Irarrazaval, Inigo Werder, Mauro A. Huss, Matthias Herman, Frederic Mariethoz, Gregoire |
author_facet |
Irarrazaval, Inigo Werder, Mauro A. Huss, Matthias Herman, Frederic Mariethoz, Gregoire |
author_sort |
Irarrazaval, Inigo |
title |
Determining the evolution of an alpine glacier drainage system by solving inverse problems |
title_short |
Determining the evolution of an alpine glacier drainage system by solving inverse problems |
title_full |
Determining the evolution of an alpine glacier drainage system by solving inverse problems |
title_fullStr |
Determining the evolution of an alpine glacier drainage system by solving inverse problems |
title_full_unstemmed |
Determining the evolution of an alpine glacier drainage system by solving inverse problems |
title_sort |
determining the evolution of an alpine glacier drainage system by solving inverse problems |
publishDate |
2021 |
url |
https://serval.unil.ch/notice/serval:BIB_2EA1F92FFA4F https://doi.org/10.1017/jog.2020.116 https://serval.unil.ch/resource/serval:BIB_2EA1F92FFA4F.P001/REF.pdf http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:ch:serval-BIB_2EA1F92FFA4F6 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology, vol. 67, no. 263, pp. 421-434 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2020.116 info:eu-repo/semantics/altIdentifier/pissn/0022-1430 info:eu-repo/semantics/altIdentifier/pissn/1727-5652 info:eu-repo/semantics/altIdentifier/urn/urn:nbn:ch:serval-BIB_2EA1F92FFA4F6 https://serval.unil.ch/notice/serval:BIB_2EA1F92FFA4F doi:10.1017/jog.2020.116 https://doi.org/10.1017/jog.2020.116 https://serval.unil.ch/resource/serval:BIB_2EA1F92FFA4F.P001/REF.pdf http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:ch:serval-BIB_2EA1F92FFA4F6 |
op_rights |
info:eu-repo/semantics/openAccess CC BY-NC-ND 4.0 https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2020.116 |
container_title |
Journal of Glaciology |
container_volume |
67 |
container_issue |
263 |
container_start_page |
421 |
op_container_end_page |
434 |
_version_ |
1790602402044313600 |