Engineering-Geological Analysis of a Subaerial Landslide in Taan Fiord, Alaska

On 17 October 2015, a large-scale subaerial landslide occurred in Taan Fiord, Alaska, which released about 50 Mm<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mn>3</mn&g...

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Autores principales:	Xiaoru Dai, Barbara Schneider-Muntau, Wolfgang Fellin, Andrea Franco, Bernhard Gems
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	subaerial landslide remote sensing data 2D limit equilibrium method triggering factor Science Q
Acceso en línea:	https://doaj.org/article/528cff8fa9bb4a48895a33d9a18021cc
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spelling	oai:doaj.org-article:528cff8fa9bb4a48895a33d9a18021cc2021-11-11T18:51:52ZEngineering-Geological Analysis of a Subaerial Landslide in Taan Fiord, Alaska10.3390/rs132142582072-4292https://doaj.org/article/528cff8fa9bb4a48895a33d9a18021cc2021-10-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/21/4258https://doaj.org/toc/2072-4292On 17 October 2015, a large-scale subaerial landslide occurred in Taan Fiord, Alaska, which released about 50 Mm<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mn>3</mn></msup></semantics></math></inline-formula> of rock. This entered the water body and triggered a tsunami with a runup of up to 193 m. This paper aims to simulate the possible formation of a weak layer in this mountainous slope until collapse, and to analyze the possible triggering factors of this landslide event from a geotechnical engineering perspective so that a deeper understanding of this large landslide event can be gained. We analyzed different remote-sensing datasets to characterize the evolution of the coastal landslide process. Based on the acquired remote-sensing data, Digital Elevation Models were derived, on which we employed a 2D limit equilibrium method in this study to calculate the safety factor and compare the location of the associated sliding surface with the most probable actual location at which this landslide occurred. The calculation results reflect the development process of this slope collapse. In this case study, past earthquakes, rainfall before this landslide event, and glacial melting at the toe may have influenced the stability of this slope. The glacial retreat is likely to be the most significant direct triggering factor for this slope failure. This research work illustrates the applicability of multi-temporal remote sensing data of slope morphology to constrain preliminary slope stability analyses, aiming to investigate large-scale landslide processes. This interdisciplinary approach confirms the effectiveness of the combination of aerial data acquisition and traditional slope stability analyses. This case study also demonstrates the significance of a climate change for landslide hazard assessment, and that the interaction of natural hazards in terms of multi-hazards cannot be ignored.Xiaoru DaiBarbara Schneider-MuntauWolfgang FellinAndrea FrancoBernhard GemsMDPI AGarticlesubaerial landslideremote sensing data2D limit equilibrium methodtriggering factorScienceQENRemote Sensing, Vol 13, Iss 4258, p 4258 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	subaerial landslide remote sensing data 2D limit equilibrium method triggering factor Science Q
spellingShingle	subaerial landslide remote sensing data 2D limit equilibrium method triggering factor Science Q Xiaoru Dai Barbara Schneider-Muntau Wolfgang Fellin Andrea Franco Bernhard Gems Engineering-Geological Analysis of a Subaerial Landslide in Taan Fiord, Alaska
description	On 17 October 2015, a large-scale subaerial landslide occurred in Taan Fiord, Alaska, which released about 50 Mm<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mn>3</mn></msup></semantics></math></inline-formula> of rock. This entered the water body and triggered a tsunami with a runup of up to 193 m. This paper aims to simulate the possible formation of a weak layer in this mountainous slope until collapse, and to analyze the possible triggering factors of this landslide event from a geotechnical engineering perspective so that a deeper understanding of this large landslide event can be gained. We analyzed different remote-sensing datasets to characterize the evolution of the coastal landslide process. Based on the acquired remote-sensing data, Digital Elevation Models were derived, on which we employed a 2D limit equilibrium method in this study to calculate the safety factor and compare the location of the associated sliding surface with the most probable actual location at which this landslide occurred. The calculation results reflect the development process of this slope collapse. In this case study, past earthquakes, rainfall before this landslide event, and glacial melting at the toe may have influenced the stability of this slope. The glacial retreat is likely to be the most significant direct triggering factor for this slope failure. This research work illustrates the applicability of multi-temporal remote sensing data of slope morphology to constrain preliminary slope stability analyses, aiming to investigate large-scale landslide processes. This interdisciplinary approach confirms the effectiveness of the combination of aerial data acquisition and traditional slope stability analyses. This case study also demonstrates the significance of a climate change for landslide hazard assessment, and that the interaction of natural hazards in terms of multi-hazards cannot be ignored.
format	article
author	Xiaoru Dai Barbara Schneider-Muntau Wolfgang Fellin Andrea Franco Bernhard Gems
author_facet	Xiaoru Dai Barbara Schneider-Muntau Wolfgang Fellin Andrea Franco Bernhard Gems
author_sort	Xiaoru Dai
title	Engineering-Geological Analysis of a Subaerial Landslide in Taan Fiord, Alaska
title_short	Engineering-Geological Analysis of a Subaerial Landslide in Taan Fiord, Alaska
title_full	Engineering-Geological Analysis of a Subaerial Landslide in Taan Fiord, Alaska
title_fullStr	Engineering-Geological Analysis of a Subaerial Landslide in Taan Fiord, Alaska
title_full_unstemmed	Engineering-Geological Analysis of a Subaerial Landslide in Taan Fiord, Alaska
title_sort	engineering-geological analysis of a subaerial landslide in taan fiord, alaska
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/528cff8fa9bb4a48895a33d9a18021cc
work_keys_str_mv	AT xiaorudai engineeringgeologicalanalysisofasubaeriallandslideintaanfiordalaska AT barbaraschneidermuntau engineeringgeologicalanalysisofasubaeriallandslideintaanfiordalaska AT wolfgangfellin engineeringgeologicalanalysisofasubaeriallandslideintaanfiordalaska AT andreafranco engineeringgeologicalanalysisofasubaeriallandslideintaanfiordalaska AT bernhardgems engineeringgeologicalanalysisofasubaeriallandslideintaanfiordalaska
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Engineering-Geological Analysis of a Subaerial Landslide in Taan Fiord, Alaska

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