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• W2794397714 abstract "Slope failures from steep bedrock slopes have occurred in mountain areas throughout time.This is a consequence of the topography, geological characteristics, intense freeze-thaw activityand oversteepened slopes from glacier erosion. However, during the past decades, an increasednumber of periglacial rock avalanche events have been recorded in the European Alps andother high mountain ranges which are thought to be related to permafrost degradation and glaciershrinkage, indicating the potentially serious hazard related to slope instabilities originatingfrom high-mountain faces.The primary aim of this study is an interdisciplinary investigation of topographic, geological,cryospheric and climatic factors influencing high-mountain rock slope stability in view of theongoing climatic change. The investigation of slope instabilities in high-mountain faces mustaccount for the large variety of factors and processes and also consider the difficult conditionsfor data acquisition. The objectives of this study, where detachment zones of recent periglacialrock avalanches in the European Alps are investigated based on a multi-scale approach, can bedivided in (a) the investigation and modelling of slope instabilities on periglacial high-mountainfaces in order to better understand the different factors and processes leading to a slope failure,and (b) the application of different data acquisition and investigation techniques to test theirsuitability for steep faces in complex and difficult high-mountain terrain.The implemented approaches consist of 1) a GIS-based statistical multi-factor analysis ofdetachment zones over the entire Central European Alps based on a rock avalanche inventory,2) a GIS-based multi-factor analysis and detailed remote-sensing-based time-lapse topographicinvestigations of the Monte Rosa east face using LiDAR and digital photogrammetry, and 3)geomechanical analysis and numerical slope stability modelling of the Tschierva rock avalancheat the Piz Morteratsch.This study has shown that in most cases a combination of several critical factors leads to aslope failure and no specific single primary factor was distinguished. The two factors slope angleand a pronounced discontinuity system are included in critical factor combinations at allfailure magnitudes. The change in a factor and the time scale of change are considered to bemore important than the individual factors. Rapid changes in a factor do not allow adequatestress redistribution within a flank and therefore, the critical shear strength may be exceeded. Alarge number of detachment zones were found to be located in areas with recent changes inglaciation and near the lower limits of local permafrost occurrence. Glaciers, mainly influencingthe topography, and permafrost, mainly affecting the groundwater regime and geotechnicalcharacteristics of discontinuities, are currently the predisposing factors having the fastestchanges. However, slow processes such as progressive failure were also found to contribute toslope instabilities.The present study demonstrates the benefits of a multi-scale approach and the combinedapplication of conventional and novel techniques for the investigation of slope instabilities inhigh-mountain terrain. Furthermore, the findings provide a fundamental basis for prospectiveslope instability susceptibility analyses and subsequent hazard assessments." @default.
• W2794397714 created "2018-03-29" @default.
• W2794397714 creator A5013498592 @default.
• W2794397714 date "2009-01-01" @default.
• W2794397714 modified "2023-09-26" @default.
• W2794397714 title "Slope instabilities on perennially frozen and glacierised rock walls: multi-scale observations, analyses and modelling" @default.
• W2794397714 doi "https://doi.org/10.5167/uzh-31038" @default.
• W2794397714 hasPublicationYear "2009" @default.
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