Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Reconstruction of rock avalanche history in Val Viola, (Upper Valtellina, Italian Central Alps) through 10Be exposure ages, Schmidt Hammer R values, and surface roughness
https://orcid.org/0000-0002-5987-2116
https://orcid.org/0000-0003-3966-3365
https://orcid.org/0000-0002-5966-9572
AbstractWe investigated the paraglacial evolution and permafrost degradation of Val Viola (Upper Valtellina, Central Italian Alps) through a geomorphologic survey, cosmogenic dating, Schmidt’s Hammer, and surface roughness measurements. Our results reveal that the previously mapped Val Viola rock avalanche is probably derived by three different events that occurred 7.7 ± 0.2 ka (Orthogneiss_ 1), 7.0 ± 0.2 ka (Paragneiss), and 5.0 ± 0.3 ka (Orthogneiss_2). Because the main valley bottom has been ice free since at least 12.6 ka, it is unlikely that the triggering factor of these events was the debutressing stress caused by the melting of local valley glaciers. Therefore, permafrost that formed in this area down to 2525 m a.s.l. at 9.3–8 ka and degraded successively between 7.8 and 6.5 ka was likely the main triggering factor of the first two rock avalanche events, as well as for the third event that happened during the warm and wet period of the Holocene Thermal Maximum around 5 ka.
Reconstruction of rock avalanche history in Val Viola, (Upper Valtellina, Italian Central Alps) through 10Be exposure ages, Schmidt Hammer R values, and surface roughness
https://orcid.org/0000-0002-5987-2116
https://orcid.org/0000-0003-3966-3365
https://orcid.org/0000-0002-5966-9572
AbstractWe investigated the paraglacial evolution and permafrost degradation of Val Viola (Upper Valtellina, Central Italian Alps) through a geomorphologic survey, cosmogenic dating, Schmidt’s Hammer, and surface roughness measurements. Our results reveal that the previously mapped Val Viola rock avalanche is probably derived by three different events that occurred 7.7 ± 0.2 ka (Orthogneiss_ 1), 7.0 ± 0.2 ka (Paragneiss), and 5.0 ± 0.3 ka (Orthogneiss_2). Because the main valley bottom has been ice free since at least 12.6 ka, it is unlikely that the triggering factor of these events was the debutressing stress caused by the melting of local valley glaciers. Therefore, permafrost that formed in this area down to 2525 m a.s.l. at 9.3–8 ka and degraded successively between 7.8 and 6.5 ka was likely the main triggering factor of the first two rock avalanche events, as well as for the third event that happened during the warm and wet period of the Holocene Thermal Maximum around 5 ka.
Reconstruction of rock avalanche history in Val Viola, (Upper Valtellina, Italian Central Alps) through 10Be exposure ages, Schmidt Hammer R values, and surface roughness
https://orcid.org/0000-0002-5987-2116
https://orcid.org/0000-0003-3966-3365
https://orcid.org/0000-0002-5966-9572
AbstractWe investigated the paraglacial evolution and permafrost degradation of Val Viola (Upper Valtellina, Central Italian Alps) through a geomorphologic survey, cosmogenic dating, Schmidt’s Hammer, and surface roughness measurements. Our results reveal that the previously mapped Val Viola rock avalanche is probably derived by three different events that occurred 7.7 ± 0.2 ka (Orthogneiss_ 1), 7.0 ± 0.2 ka (Paragneiss), and 5.0 ± 0.3 ka (Orthogneiss_2). Because the main valley bottom has been ice free since at least 12.6 ka, it is unlikely that the triggering factor of these events was the debutressing stress caused by the melting of local valley glaciers. Therefore, permafrost that formed in this area down to 2525 m a.s.l. at 9.3–8 ka and degraded successively between 7.8 and 6.5 ka was likely the main triggering factor of the first two rock avalanche events, as well as for the third event that happened during the warm and wet period of the Holocene Thermal Maximum around 5 ka.
Reconstruction of rock avalanche history in Val Viola, (Upper Valtellina, Italian Central Alps) through 10Be exposure ages, Schmidt Hammer R values, and surface roughness
Landslides
Longhi, Alessandro (Autor:in) / Morgan, Daniel (Autor:in) / Guglielmin, Mauro (Autor:in)
Landslides ; 21 ; 949-962
01.05.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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