Rockfalls, fragmentation, and dust clouds: analysis of the 2017 Pousset event (Northern Italy)
The process and dynamics of rock fragmentation during the collapse of rockfalls and rock avalanches is a poorly developed topic. The most severe fragmentation often leads to the formation of a rock dust that rises to form a cloud suspended in the air. The understanding of fragmentation processes is...
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Springer Science and Business Media Deutschland GmbH
2023
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Online Access: | https://hdl.handle.net/10281/441500 https://doi.org/10.1007/s10346-023-02115-6 |
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ftunivmilanobic:oai:boa.unimib.it:10281/441500 2024-04-14T08:18:15+00:00 Rockfalls, fragmentation, and dust clouds: analysis of the 2017 Pousset event (Northern Italy) Crosta, GB Dattola, G Lanfranconi, C De Blasio, FV Malusà, MG Bertolo, D Crosta, G Dattola, G Lanfranconi, C De Blasio, F Malusà, M Bertolo, D 2023 STAMPA https://hdl.handle.net/10281/441500 https://doi.org/10.1007/s10346-023-02115-6 eng eng Springer Science and Business Media Deutschland GmbH country:DE info:eu-repo/semantics/altIdentifier/wos/WOS:001048601100001 volume:20 issue:12 firstpage:2545 lastpage:2562 numberofpages:18 journal:LANDSLIDES https://hdl.handle.net/10281/441500 doi:10.1007/s10346-023-02115-6 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85168159096 Dust cloud Fragmentation HyStone Permafrost thawing Rockfall info:eu-repo/semantics/article 2023 ftunivmilanobic https://doi.org/10.1007/s10346-023-02115-6 2024-03-21T16:15:25Z The process and dynamics of rock fragmentation during the collapse of rockfalls and rock avalanches is a poorly developed topic. The most severe fragmentation often leads to the formation of a rock dust that rises to form a cloud suspended in the air. The understanding of fragmentation processes is hampered by the environmental disturbances that alter the dust cloud deposit shortly after deposition. Here, we study the fragmentation of the October 2017 Pousset rockfall, detached from a NNE facing steep bedrock wall in the permafrost zone, that involved 8,300m3 of metamorphic rock and fell about 800 m. The collapse generated large boulders which rolled downslope and a thick and large dust cloud. The source and deposit were investigated, and dust cloud material was sampled at different locations to reconstruct an exponential thickness distribution and perform grain size characterization. The fragmentation energy was estimated by integrating the spectrum of the grains assuming that the fragmentation energy is proportional to the generated area. The fragmentation energy was found to be about 0.4% of the initial potential energy. Most probable fragmentation points and block deposition areas were evaluated and positioned by means of the HyStone 3D rockfall simulator. Furthermore, we calculated the flow rate of the suspended powder generated by the fragmentation process and compared the results with observations available for the evolution of the phenomenon and the collected samples. The Pousset event, in its relatively simple dynamics, may be a good testing ground to address the current theories of rockfall and rock avalanche fragmentation and dust cloud behavior. Article in Journal/Newspaper permafrost Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) Landslides |
institution |
Open Polar |
collection |
Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) |
op_collection_id |
ftunivmilanobic |
language |
English |
topic |
Dust cloud Fragmentation HyStone Permafrost thawing Rockfall |
spellingShingle |
Dust cloud Fragmentation HyStone Permafrost thawing Rockfall Crosta, GB Dattola, G Lanfranconi, C De Blasio, FV Malusà, MG Bertolo, D Rockfalls, fragmentation, and dust clouds: analysis of the 2017 Pousset event (Northern Italy) |
topic_facet |
Dust cloud Fragmentation HyStone Permafrost thawing Rockfall |
description |
The process and dynamics of rock fragmentation during the collapse of rockfalls and rock avalanches is a poorly developed topic. The most severe fragmentation often leads to the formation of a rock dust that rises to form a cloud suspended in the air. The understanding of fragmentation processes is hampered by the environmental disturbances that alter the dust cloud deposit shortly after deposition. Here, we study the fragmentation of the October 2017 Pousset rockfall, detached from a NNE facing steep bedrock wall in the permafrost zone, that involved 8,300m3 of metamorphic rock and fell about 800 m. The collapse generated large boulders which rolled downslope and a thick and large dust cloud. The source and deposit were investigated, and dust cloud material was sampled at different locations to reconstruct an exponential thickness distribution and perform grain size characterization. The fragmentation energy was estimated by integrating the spectrum of the grains assuming that the fragmentation energy is proportional to the generated area. The fragmentation energy was found to be about 0.4% of the initial potential energy. Most probable fragmentation points and block deposition areas were evaluated and positioned by means of the HyStone 3D rockfall simulator. Furthermore, we calculated the flow rate of the suspended powder generated by the fragmentation process and compared the results with observations available for the evolution of the phenomenon and the collected samples. The Pousset event, in its relatively simple dynamics, may be a good testing ground to address the current theories of rockfall and rock avalanche fragmentation and dust cloud behavior. |
author2 |
Crosta, G Dattola, G Lanfranconi, C De Blasio, F Malusà, M Bertolo, D |
format |
Article in Journal/Newspaper |
author |
Crosta, GB Dattola, G Lanfranconi, C De Blasio, FV Malusà, MG Bertolo, D |
author_facet |
Crosta, GB Dattola, G Lanfranconi, C De Blasio, FV Malusà, MG Bertolo, D |
author_sort |
Crosta, GB |
title |
Rockfalls, fragmentation, and dust clouds: analysis of the 2017 Pousset event (Northern Italy) |
title_short |
Rockfalls, fragmentation, and dust clouds: analysis of the 2017 Pousset event (Northern Italy) |
title_full |
Rockfalls, fragmentation, and dust clouds: analysis of the 2017 Pousset event (Northern Italy) |
title_fullStr |
Rockfalls, fragmentation, and dust clouds: analysis of the 2017 Pousset event (Northern Italy) |
title_full_unstemmed |
Rockfalls, fragmentation, and dust clouds: analysis of the 2017 Pousset event (Northern Italy) |
title_sort |
rockfalls, fragmentation, and dust clouds: analysis of the 2017 pousset event (northern italy) |
publisher |
Springer Science and Business Media Deutschland GmbH |
publishDate |
2023 |
url |
https://hdl.handle.net/10281/441500 https://doi.org/10.1007/s10346-023-02115-6 |
genre |
permafrost |
genre_facet |
permafrost |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:001048601100001 volume:20 issue:12 firstpage:2545 lastpage:2562 numberofpages:18 journal:LANDSLIDES https://hdl.handle.net/10281/441500 doi:10.1007/s10346-023-02115-6 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85168159096 |
op_doi |
https://doi.org/10.1007/s10346-023-02115-6 |
container_title |
Landslides |
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1796317698501640192 |