(Article of periodic en Anglais - 2012)

Document title

Laboratory observations of sediment entrainment by freezing supercooled water

Authors(s) and Affiliation(s)

COOK S.J. (1) ; KNIGHT P.G. (2 3) ; KNIGHT D.A. (3) ; WALLER R.I. (2 3) ;
(1) Centre for Glaciology, Inst. Geography and Earth Sciences, Univ. Wales, Aberystwyth, ROYAUME-UNI
(2) Research Inst. for Environment, Physical Sciences and Applied Mathematics (EPSAM), Univ., Staffordshire, Keele, ROYAUME-UNI
(3) School of Physical and Geographical Sciences, Univ., Keele, ROYAUME-UNI


The AA. present results of laboratory experiments designed to test a hypothesis that silt is preferentially entrained by freezing supercooled water and that silt-dominance is, therefore, a diagnostic indicator of glaciohydraulic supercooling. They performed experiments to simulate 2 freezing processes : filtration of sediment-laden water through frazil ice; and turbulent supercooling and subsequent freezing of sediment-laden water. Different mixtures of particle sizes (sand, silt and clay) were added to the parent water. The results indicate that, contrary to previous suggestions, these processes do not lead to the preferential entrainment of silt in the resulting ice. The silt-dominated character of basal ice types associated with supercooling may result from other controls such as a silt-dominated sediment supply or subglacial water flow rates, rather than the freezing process


Article of periodic

published at : Geografiska annaler. Series A. Physical geography / ISSN 0435-3676 / CODEN GAPGAP

Editor : Svenska sällskapet för antropologi och geografi, Stockholm - SUEDE (1965)

Millesime : 2012, vol. 94, no3 [pp. 351-362]

Bibliographic references : 47 ref.

Collation : 3 fig., 1 tabl.




Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1111/j.1468-0459.2011.00445.x

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2013
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