Mots-clés
Alaska ; Bilan sédimentaire ; Catastrophe ; Glaciaire ; Glissement de terrain ; Image satellite ; Montagne ; Paraglaciaire ; Vitesse d'érosion ; Zone froideAlaska ; Catastrophe ; Cold area ; Erosion rate ; Glacial features ; Landslide ; Mountain ; Paraglacial ; Satellite imagery ; Sediment budgetAlaska ; Balance sedimentario ; Catástrofe ; Deslizamiento deterreno ; Glaciar ; Imagen satélite ; Montaña ; Paraglaciar ; Velocidad de erosión ; Zona fríaSupra-glacial deposition and flux of catastrophic rock–slope failure debris, south-central Alaska
Auteur(s) et Affiliation(s)
UHLMANN, M.
Dept. of Geography, Univ., Zürich, Suisse
KORUP, O.
Inst. of Earth and Environmental Sciences, Univ., Potsdam, Allemagne
HUGGEL, C.
Dept. of Geography, Univ., Zürich, Suisse
FISCHER, L.
Geological Survey of Norway (NGU), Trondheim, Norvege
KARGEL, J.S.
Dept. of Hydrology and Water Resources, Univ. of Arizona, Tucson, Etats-Unis
Description :
The AA. present an unprecedented regional-scale inventory of supra-glacial sediment flux and hillslope erosion rates inferred from an analysis of 123 large catastrophic bedrock landslides that fell onto glaciers in the Chugach Mountains, Alaska, as documented by satellite images obtained between 1972 to 2008. Assuming these supra-glacial landslide deposits to be passive strain markers they infer minimum decadal-scale sediment yields for a given glacier-surface cross-section impacted by episodic rock-slope failure. These rates compare to reported fluvial sediment yields in many mountain rivers, but are an order of magnitude below the extreme sediment yields measured at the snouts of Alaskan glaciers, indicating that the bulk of debris discharged derives from en-glacial, sub-glacial or ice-proximal sources. The inferred rates of hillslope erosion in the Chugach Mountains remain an order of magnitude below the pace of extremely rapid glacial sediment export and glacio-isostatic surface uplift previously reported from the region.
Type de document :
Article de périodique
Source :
Earth surface processes and landforms, issn : 0197-9337, 2013, vol. 38, n°. 7, p. 675-682, nombre de pages : 8, Références bibliographiques : 1 p.
Date :
2013
Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley
Langue :
Anglais
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)