The Internal Structure of Periglacial Landforms - Assessments of Subsurface Variations in Permafrost-related and Frost-related Phenomena by Multi-dimensional Geophysical Investigations
The internal structure of periglacial landforms contains valuable information on past and present environmental conditions. To benefit from this archive, however, an enhanced understanding of subsurface variations is crucial. This enables to assess the influence of the internal structure on prevaili...
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Format: | Doctoral or Postdoctoral Thesis |
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2020
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Online Access: | https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/20243 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-202437 https://doi.org/10.25972/WUP-978-3-95826-139-6 https://opus.bibliothek.uni-wuerzburg.de/files/20243/978-3-95826-139-6_Emmert_OPUS_20243_komp.pdf |
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ftunivwuerz:oai:opus.bibliothek.uni-wuerzburg.de:20243 2023-09-05T13:20:07+02:00 The Internal Structure of Periglacial Landforms - Assessments of Subsurface Variations in Permafrost-related and Frost-related Phenomena by Multi-dimensional Geophysical Investigations Der innere Aufbau Periglazialer Landformen Emmert, Adrian Alexander 2020 application/pdf https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/20243 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-202437 https://doi.org/10.25972/WUP-978-3-95826-139-6 https://opus.bibliothek.uni-wuerzburg.de/files/20243/978-3-95826-139-6_Emmert_OPUS_20243_komp.pdf eng eng https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/20243 urn:nbn:de:bvb:20-opus-202437 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-202437 978-3-95826-138-9 978-3-95826-139-6 https://doi.org/10.25972/WUP-978-3-95826-139-6 https://opus.bibliothek.uni-wuerzburg.de/files/20243/978-3-95826-139-6_Emmert_OPUS_20243_komp.pdf https://creativecommons.org/licenses/by-sa/4.0/deed.de info:eu-repo/semantics/openAccess Permafrost Geophysik ddc:550 doctoralthesis doc-type:doctoralThesis 2020 ftunivwuerz https://doi.org/10.25972/WUP-978-3-95826-139-6 2023-08-13T22:34:18Z The internal structure of periglacial landforms contains valuable information on past and present environmental conditions. To benefit from this archive, however, an enhanced understanding of subsurface variations is crucial. This enables to assess the influence of the internal structure on prevailing process regimes and to evaluate the sensitivity of different landform units to environmental changes. This thesis investigates structural variations in the subsurface of (i) rock glaciers,(ii) solifluction lobes, (iii) palsas/ lithalsas and (iv) patterned ground, which occur between the different landform types, but also between landform units of the same type. Investigated variables comprise (i) the spatial distribution of permafrost, (ii) ground ice content, (iii) the origin of ground ice, (iv) thickness of the active layer and (v) frost table topography. Multi-dimensional investigations by the geophysical methods Electrical Resistivity Imaging (ERI) and Ground-Penetrating Radar (GPR) were performed in six study areas (a–f): four of them are located in high-alpine environments in Switzerland and two of them are located in the subarctic highlands of Iceland. Additionally, surface and subsurface temperature values were continuously recorded at selected study sites. At one study site, pF-values, representing the matric potential (or water potential), were recorded. From a methodological view, this thesis focuses on the application of quasi-3-D ERI, an approach in which many two-dimensional data sets are combined to create one three-dimensional data set. This permits e.g., a three-dimensional delimitation of subsurface structures and a spatial investigation of the distribution of ground ice. Besides the analysis of field data, this thesis incudes a comparison between inversion models produced with different software products, based on two synthetic data sets. The detection of resistivity structures and reflection patterns provides valuable insights into the internal structure of the investigated landform units: At ... Doctoral or Postdoctoral Thesis Ice Iceland palsas permafrost Subarctic Würzburg University: Online Publication Service |
institution |
Open Polar |
collection |
Würzburg University: Online Publication Service |
op_collection_id |
ftunivwuerz |
language |
English |
topic |
Permafrost Geophysik ddc:550 |
spellingShingle |
Permafrost Geophysik ddc:550 Emmert, Adrian Alexander The Internal Structure of Periglacial Landforms - Assessments of Subsurface Variations in Permafrost-related and Frost-related Phenomena by Multi-dimensional Geophysical Investigations |
topic_facet |
Permafrost Geophysik ddc:550 |
description |
The internal structure of periglacial landforms contains valuable information on past and present environmental conditions. To benefit from this archive, however, an enhanced understanding of subsurface variations is crucial. This enables to assess the influence of the internal structure on prevailing process regimes and to evaluate the sensitivity of different landform units to environmental changes. This thesis investigates structural variations in the subsurface of (i) rock glaciers,(ii) solifluction lobes, (iii) palsas/ lithalsas and (iv) patterned ground, which occur between the different landform types, but also between landform units of the same type. Investigated variables comprise (i) the spatial distribution of permafrost, (ii) ground ice content, (iii) the origin of ground ice, (iv) thickness of the active layer and (v) frost table topography. Multi-dimensional investigations by the geophysical methods Electrical Resistivity Imaging (ERI) and Ground-Penetrating Radar (GPR) were performed in six study areas (a–f): four of them are located in high-alpine environments in Switzerland and two of them are located in the subarctic highlands of Iceland. Additionally, surface and subsurface temperature values were continuously recorded at selected study sites. At one study site, pF-values, representing the matric potential (or water potential), were recorded. From a methodological view, this thesis focuses on the application of quasi-3-D ERI, an approach in which many two-dimensional data sets are combined to create one three-dimensional data set. This permits e.g., a three-dimensional delimitation of subsurface structures and a spatial investigation of the distribution of ground ice. Besides the analysis of field data, this thesis incudes a comparison between inversion models produced with different software products, based on two synthetic data sets. The detection of resistivity structures and reflection patterns provides valuable insights into the internal structure of the investigated landform units: At ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Emmert, Adrian Alexander |
author_facet |
Emmert, Adrian Alexander |
author_sort |
Emmert, Adrian Alexander |
title |
The Internal Structure of Periglacial Landforms - Assessments of Subsurface Variations in Permafrost-related and Frost-related Phenomena by Multi-dimensional Geophysical Investigations |
title_short |
The Internal Structure of Periglacial Landforms - Assessments of Subsurface Variations in Permafrost-related and Frost-related Phenomena by Multi-dimensional Geophysical Investigations |
title_full |
The Internal Structure of Periglacial Landforms - Assessments of Subsurface Variations in Permafrost-related and Frost-related Phenomena by Multi-dimensional Geophysical Investigations |
title_fullStr |
The Internal Structure of Periglacial Landforms - Assessments of Subsurface Variations in Permafrost-related and Frost-related Phenomena by Multi-dimensional Geophysical Investigations |
title_full_unstemmed |
The Internal Structure of Periglacial Landforms - Assessments of Subsurface Variations in Permafrost-related and Frost-related Phenomena by Multi-dimensional Geophysical Investigations |
title_sort |
internal structure of periglacial landforms - assessments of subsurface variations in permafrost-related and frost-related phenomena by multi-dimensional geophysical investigations |
publishDate |
2020 |
url |
https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/20243 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-202437 https://doi.org/10.25972/WUP-978-3-95826-139-6 https://opus.bibliothek.uni-wuerzburg.de/files/20243/978-3-95826-139-6_Emmert_OPUS_20243_komp.pdf |
genre |
Ice Iceland palsas permafrost Subarctic |
genre_facet |
Ice Iceland palsas permafrost Subarctic |
op_relation |
https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/20243 urn:nbn:de:bvb:20-opus-202437 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-202437 978-3-95826-138-9 978-3-95826-139-6 https://doi.org/10.25972/WUP-978-3-95826-139-6 https://opus.bibliothek.uni-wuerzburg.de/files/20243/978-3-95826-139-6_Emmert_OPUS_20243_komp.pdf |
op_rights |
https://creativecommons.org/licenses/by-sa/4.0/deed.de info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.25972/WUP-978-3-95826-139-6 |
_version_ |
1776200844490833920 |