An Extreme Sediment Transfer Event in a Canadian High Arctic Stream.

Lewis, Ted; Braun, Carsten; Hardy, Douglas R.; Francus, Pierre et Bradley, Raymond S. (2005). An Extreme Sediment Transfer Event in a Canadian High Arctic Stream. Arctic, Antarctic, and Alpine Research , vol. 37 , nº 4. pp. 477-482. DOI: 10.1657/1523-0430(2005)037[0477:AESTEI]2.0.CO;2.

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Résumé

Two large suspended sediment concentration (SSC) pulses were recorded in 1998 in a small snowmelt-fed stream on Ellesmere Island in the Canadian High Arctic. The largest pulse occurred from 7 to 8 July, when 32% of the monitored seasonal sediment transport occurred in only four hours. SSC reached 83,760 mg L⁻¹, exceeding all previously recorded values from high arctic glacially-fed and snowmelt-fed rivers by more than one order of magnitude. The event occurred after the majority of snow in the watershed had melted, and was preceded by a long period of relatively high air temperature, and a small rainfall event on 7 July. We consider the most likely cause of the event to be a rapid mass movement.

Type de document:	Article
Mots-clés libres:	sédiments; cours d'eau; Canada; Arctique
Centre:	Centre Eau Terre Environnement
Date de dépôt:	18 nov. 2020 19:51
Dernière modification:	18 nov. 2020 19:51
URI:	https://espace.inrs.ca/id/eprint/9576

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