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(Article of periodic en Anglais - 2013)

Document title

Snow cornice dynamics as a control on plateau edge erosion in central Svalbard

Authors(s) and Affiliation(s)

ECKERSTORFER M. (1 2) ; CHRISTIANSEN H.H. (1 2) ; VOGEL S. (1 2) ; RUBENSDOTTER L. (3) ;
(1) Arctic Geology Dep., Univ. Centre in Svalbard, Longyearbyen, NORVEGE
(2) Dept. of Geosciences, Univ., Oslo, NORVEGE
(3) Geological Survey of Norway (NGU), Trondheim, NORVEGE

Abstract

Snow cornices grow extensively on leeward edges of plateau mountains in central Svalbard. Seasonal snow cornice dynamics control bedrock weathering and erosion in sedimentary bedrock on the Gruvefjellet plateau edge in the valley Longyeardalen. Air, snow and ground temperature sensors, as well as automatic time-lapse cameras on a leeward facing plateau edge were used to study seasonal cornice dynamics. These techniques allowed for monitoring of cornice accretion, deformation and collapse/melting in great detail. The active layer of the top plateau edge is characterized by high moisture content due to rain before freeze-up in autumn and cornice meltdown during spring thaw. Thus frost weathering there can be very efficient. The cornice will either collapse or melt, resulting in suspended sediment transport downslope by cornice fall avalanche or release as rock fall respectively. Therefore, cornices both promote and trigger high weathering rates on Gruvefjellet, and thus control presently the development of the rockwall free faces and the talus cones

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2013, vol. 38, no5 [pp. 466-476]

Bibliographic references : 1 p.

Collation : 11 fig.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3292

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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