Hazard assessment of potential periglacial debris flows based on GIS-based spatial modelling and geophysical field surveys: a case study in the Swiss Alps
Combined geomorphological and geophysical approaches were used to perform a hazard assessment of potential periglacial debris flow. Possible debris flow initiation zones were identified within a GIS-based model and located based on geomorphic attributes which contribute the most to this type of inst...
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ftunivzuerich:oai:www.zora.uzh.ch:62158 2024-06-23T07:53:38+00:00 Hazard assessment of potential periglacial debris flows based on GIS-based spatial modelling and geophysical field surveys: a case study in the Swiss Alps Kneisel, C Rothenbühler, C Keller, F Haeberli, W 2007 application/pdf https://www.zora.uzh.ch/id/eprint/62158/ https://www.zora.uzh.ch/id/eprint/62158/1/Kneisel_etal_2007_hazard_assessment.pdf https://doi.org/10.5167/uzh-62158 https://doi.org/10.1002/ppp.593 eng eng Wiley https://www.zora.uzh.ch/id/eprint/62158/1/Kneisel_etal_2007_hazard_assessment.pdf doi:10.5167/uzh-62158 doi:10.1002/ppp.593 urn:issn:1045-6740 info:eu-repo/semantics/restrictedAccess Kneisel, C; Rothenbühler, C; Keller, F; Haeberli, W (2007). Hazard assessment of potential periglacial debris flows based on GIS-based spatial modelling and geophysical field surveys: a case study in the Swiss Alps. Permafrost and Periglacial Processes, 18(3):259-268. Institute of Geography 910 Geography & travel Earth-Surface Processes Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2007 ftunivzuerich https://doi.org/10.5167/uzh-6215810.1002/ppp.593 2024-06-12T00:22:39Z Combined geomorphological and geophysical approaches were used to perform a hazard assessment of potential periglacial debris flow. Possible debris flow initiation zones were identified within a GIS-based model and located based on geomorphic attributes which contribute the most to this type of instability. In permafrost-affected alpine environments, these include the extent and location of ground ice and permafrost. In a potential debris flow-starting zone in the Upper Engadine (moraine/debris rock glacier complex Boval) two-dimensional electrical resistivity surveys were used to detect the presence/absence of permafrost and to estimate active-layer depth. The results show that the moraine complex represents a periglacial debris reservoir which consists of frozen and unfrozen debris. The ice-bonded part of the moraine is largely protected from sudden destabilisation and retrogressive erosion can be assumed to be limited. However, future degradation or loss of permafrost in the lower parts of the debris rock glacier would increase the amount of erodible debris and generally reduce mechanical stability. Article in Journal/Newspaper Ice permafrost Permafrost and Periglacial Processes University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
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Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel Earth-Surface Processes |
spellingShingle |
Institute of Geography 910 Geography & travel Earth-Surface Processes Kneisel, C Rothenbühler, C Keller, F Haeberli, W Hazard assessment of potential periglacial debris flows based on GIS-based spatial modelling and geophysical field surveys: a case study in the Swiss Alps |
topic_facet |
Institute of Geography 910 Geography & travel Earth-Surface Processes |
description |
Combined geomorphological and geophysical approaches were used to perform a hazard assessment of potential periglacial debris flow. Possible debris flow initiation zones were identified within a GIS-based model and located based on geomorphic attributes which contribute the most to this type of instability. In permafrost-affected alpine environments, these include the extent and location of ground ice and permafrost. In a potential debris flow-starting zone in the Upper Engadine (moraine/debris rock glacier complex Boval) two-dimensional electrical resistivity surveys were used to detect the presence/absence of permafrost and to estimate active-layer depth. The results show that the moraine complex represents a periglacial debris reservoir which consists of frozen and unfrozen debris. The ice-bonded part of the moraine is largely protected from sudden destabilisation and retrogressive erosion can be assumed to be limited. However, future degradation or loss of permafrost in the lower parts of the debris rock glacier would increase the amount of erodible debris and generally reduce mechanical stability. |
format |
Article in Journal/Newspaper |
author |
Kneisel, C Rothenbühler, C Keller, F Haeberli, W |
author_facet |
Kneisel, C Rothenbühler, C Keller, F Haeberli, W |
author_sort |
Kneisel, C |
title |
Hazard assessment of potential periglacial debris flows based on GIS-based spatial modelling and geophysical field surveys: a case study in the Swiss Alps |
title_short |
Hazard assessment of potential periglacial debris flows based on GIS-based spatial modelling and geophysical field surveys: a case study in the Swiss Alps |
title_full |
Hazard assessment of potential periglacial debris flows based on GIS-based spatial modelling and geophysical field surveys: a case study in the Swiss Alps |
title_fullStr |
Hazard assessment of potential periglacial debris flows based on GIS-based spatial modelling and geophysical field surveys: a case study in the Swiss Alps |
title_full_unstemmed |
Hazard assessment of potential periglacial debris flows based on GIS-based spatial modelling and geophysical field surveys: a case study in the Swiss Alps |
title_sort |
hazard assessment of potential periglacial debris flows based on gis-based spatial modelling and geophysical field surveys: a case study in the swiss alps |
publisher |
Wiley |
publishDate |
2007 |
url |
https://www.zora.uzh.ch/id/eprint/62158/ https://www.zora.uzh.ch/id/eprint/62158/1/Kneisel_etal_2007_hazard_assessment.pdf https://doi.org/10.5167/uzh-62158 https://doi.org/10.1002/ppp.593 |
genre |
Ice permafrost Permafrost and Periglacial Processes |
genre_facet |
Ice permafrost Permafrost and Periglacial Processes |
op_source |
Kneisel, C; Rothenbühler, C; Keller, F; Haeberli, W (2007). Hazard assessment of potential periglacial debris flows based on GIS-based spatial modelling and geophysical field surveys: a case study in the Swiss Alps. Permafrost and Periglacial Processes, 18(3):259-268. |
op_relation |
https://www.zora.uzh.ch/id/eprint/62158/1/Kneisel_etal_2007_hazard_assessment.pdf doi:10.5167/uzh-62158 doi:10.1002/ppp.593 urn:issn:1045-6740 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.5167/uzh-6215810.1002/ppp.593 |
_version_ |
1802645376236257280 |