http://www.cnr.it/ontology/cnr/individuo/prodotto/ID137459

Alluvial fans in the Italian Alps: sedimentary facies and processes (Contributo in volume (capitolo o saggio))

Type

Prodotto della ricerca (Classe)
Contributo in volume (capitolo o saggio) (Classe)

Label

Alluvial fans in the Italian Alps: sedimentary facies and processes (Contributo in volume (capitolo o saggio)) (literal)

Anno

2002-01-01T00:00:00+01:00 (literal)

Alternative label

Moscariello A.1, Marchi L. 2, Maraga F.3, Mortara G. 3 (2002)
Alluvial fans in the Italian Alps: sedimentary facies and processes
Blackwell, Oxford (Regno Unito) in Flood and Megaflood Processes and Deposits: Recent and Ancient Examples, 2002
(literal)

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Moscariello A.1, Marchi L. 2, Maraga F.3, Mortara G. 3 (literal)

Pagina inizio

141 (literal)

Pagina fine

166 (literal)

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Lo studio è esteso a tutto l'arco alpino e fornisce anche suggestioni per la pianificazione di aree esposte a rischio di colata detritica torrentizia. Lo studio si inserisce nel contesto interdisciplinare di una selezione di contributi raggruppati in una speciale pubblicazione dell'International Association of Sedimentologists che ha lo scopo di divulgare la conoscenza sulle piene estreme e il loro ruolo morfodinamico sul territorio. (literal)

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Oxford (UK) (literal)

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Flood and Megaflood Processes and Deposits: Recent and Ancient Examples (literal)

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32 (literal)

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Martini P.I., Vaker V.R., Garzon G. (literal)

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26 (literal)

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Alpine sediment gravity flow are common processes,characterized by rapid deposition of large amounts of material. Hazard evaluation depends on proper identification of dominant sedimentary processes. Three groups of alluvial fans, characterized by different dominant sedimentary processes , have been disthinguished on the basis of lithological characteristics of the catchment area (1 massive and/or stratified carbonate rocks;2 fine-grained sedimentary and metamorphic rocks;3 massive crystalline rocks). Their characteristics are illustrated by three case studies. The comparison of sediment texture and grain-size distribution indicates that differences in the sedimentological features of flows are generated by the different rock types in the catchment. Colluvium lithology controls the grain-size distribution of the debris available on the catchment that is mobilized, transported and accumulated on the fan during flood events. The proportion of fine-grained particles within colluvium plays a key role in controlling the dominant sedimentary processes. The study of 23 flood events indicated that the catchments of group 1 and 2 fans produce large amounts of clay and fine silt, wich typically can lead to the generation of cohesive sediment gravity flows. Group 3 fan catchments produce colluvium free of clay and fine silt that can be mobilized and transported by water flow processes and wich in extreme flood events usually are associated with non-cohesive sediment gravity flows. (literal)

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1 Univ. Cambridge; 2 CNR-IRPI sez. Padova; 3 CNR-IRPI sez. Torino (literal)

Titolo

Alluvial fans in the Italian Alps: sedimentary facies and processes (literal)

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Flood and Megaflood Processes and Deposits: Recent and Ancient Examples (literal)

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0-632-06404-8 (literal)

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Martini P.I., Baker V.R., Garzon G. (literal)

Abstract

Sediment gravity flows are very common sedimentary processes in the Alpine region and are often characterized by rapid deposition of large amounts of material. Hazard evaluation in such mountainous areas depends on proper identification of the dominant sedimentary processes, interpreted both from modern and ancient sedimentary facies and their distribution. Three main groups of alluvial fans, characterized by different dominant sedimentary processes, have been distinguished on the basis of lithological characteristics of the catchment area. The dominant catchment lithologies are: 1 massive and/or crudely stratified carbonate rocks (dolomite and massive limestones); 2 fine-grained sedimentary and metamorphic rocks (schists, calc-schists, mica schists, slate, phyllites and quartzites); 3 massive crystalline rocks (granites, granodiorites). Their main characteristics are illustrated by three case studies concerning large debris-flow events that occurred in the recent past. The comparison of sediment texture and grain-size distribution indicates that important differences in the sedimentological features of debris flows are generated by the three different rock types in the catchments. Colluvium lithology strongly controls the grain-size distribution of the debris available on the catchment that is mobilized, transported and accumulated on the fan during catastrophic flood events. The proportion of fine-grained particles (clay and fine silt) within the colluvium plays a key role in controlling the dominant primary sedimentary processes. The study of 23 flood events over the past 30 yr indicates that the catchments of group 1 and 2 fans produce large amounts of clay and fine silt, which typically can lead to the generation of cohesive sediment gravity flows. Group 3 fan catchments produce colluvium free of clay and fine silt that can be mobilized and transported by water flow processes, and which in extreme flood events usually are associated with non-cohesive sediment gravity flows. (literal)

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