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(Article of periodic en Anglais - 2011)

Document title

Effects of ice content on the thermal erosion of permafrost: implications for coastal and fluvial erosion

Authors(s) and Affiliation(s)

DUPEYRAT L. (1) ; COSTARD F. (1) ; RANDRIAMAZAORO R. (1) ; GAILHARDIS E. (1) ; GAUTIER E. (2) ; FEDOROV A. (3) ;
(1) UMR 8148 IDES, CNRS, Univ. Paris-Sud, Orsay, FRANCE
(2) Univ. Paris 8, CNRS UMR 8591, Lab. Géographie Physique, Meudon, FRANCE
(3) Melnikov Permafrost Inst., Russian Academy of Sciences, Sakha (Yakutia) Republic, RUSSIE, FEDERATION DE

Abstract

The effects of ice content and water flow on thawing and erosion of non-cohesive permafrost banks were investigated through laboratory experiments. A critical ice content was identified as associated with turbulent flows, above which thermal erosion results in ablation and a decrease in ice content increases ablation. Below the critical value, the ablation model over-estimates the erosion rate as the removal of thawed sediments occurs episodically, possibly due to the imbrication of sand grains. The ablation model applies to rivers with non-cohesive banks, high ice contents and subject to high-velocity water flows. The model may explain differential erosion that results in massive ice layers in relief

Source

Article of periodic

published at : Permafrost and periglacial processes / ISSN 1045-6740 / CODEN PEPPED

Editor : Wiley, Chichester - ROYAUME-UNI (1990)

Millesime : 2011, vol. 22, no2 [pp. 179-187]

Bibliographic references : 34 ref.

Collation : 4 fig.

Language

Anglais

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/ppp.722

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2011
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