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Landslide on glaciers: an example from Western Alps(Cogne-Italy)

Journal of Mountain Science 2020年第5期17卷 1161-1171页

作者： FRASCA Marco VACHA Damiano CHICCO Jessica TROILO Fabrizio bertolo davide Fondazione Montagna Sicura Localita Villard de la Palud 111013 CourmayeurAostaItaly Universita degli Studi di Torino Department of Earth SciencesVia Valperga Caluso 3510125 TorinoItaly Regione Autonoma Valle d'Aosta-Assessorato alle opere pubbliche territorio ed edilizia residenziale pubblicaLocalita Ameriquen.3311020 QuartAostaItaly

In the warm summer of 2017,a landslide failed from the south-east side of the Col des Clochettes on the top of the underlying Trajo *** study area is at an elevation of about 3500 m *** the Gran Paradiso Massif and can be hardly reached by walking from Cogne(Aosta Valley,NW Italy).Studies conducted by field surveys,photogrammetry(structure from motion)and satellite images analysis,integrated with the evaluation of data from meteorological stations have been used to reconstruct the phenomenon and infer its *** site is very complex to be studied especially due to logistic problems,therefore,measurements and observations that are common practice in other landslides are very difficult to apply ***,many of the results achieved are not adequately supported by field ***,the following factors could have affected the stability of the slope:i)the tectonic structure of the area,which is reflected on the morphology and on the geomechanics characteristics of the rock masses;ii)the meteorological conditions during 3 months before the main failure,resulting in an extremely high temperature compared to historical ***,the analysis of multitemporal satellite images allowed to recognize that it was not a single landslide but that the phenomenon is articulated over time in at least five failures in about 2 ***,several predisposing factors may have been playing an important role in causing the instability:the degradation of permafrost(probably affecting rock mass due to the circulation of warm air and water in the discontinuity systems),the alternance of the freeze-thaw cycles and the availability of a considerable amount of water from rainfalls and nival fusion infiltrating deeply in the rock *** common causes such as rains and earthquakes have been excluded.

关键词： Landslide Glacier Remote sensing Climate changes Western Italian Alps

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