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(Article of periodic en Anglais - 2011)

Document title

Increase in coarse sediment transport associated with disturbance of gravel river beds by signal crayfish (Pacifastacus leniusculus)

Authors(s) and Affiliation(s)

JOHNSON M.F. (1) ; RICE S.P. (1) ; REID I. (1) ;
(1) Dep. of Geography, Univ., Loughborough, ROYAUME-UNI

Abstract

A series of flume experiments, using loose and water-worked gravel beds of narrowly graded grain sizes that were exposed to 6 h of crayfish activity under low-velocity flows, showed a substantial increase in the number of grains entrained by subsequent higher-velocity flows when compared with control runs in which crayfish were never introduced. Crayfish alter the topography of their substrate by constructing pits and mounds, which affect grain protrusion. When walking and foraging, they also alter gravel fabric by reorienting and changing the friction angle of surface grains. The increase in entrainment arising from disturbance by crayfish was shown statistically significant, with grain transport nearly twice as great. This study illustrates further the importance of acknowledging the impact of mobile organisms in conditioning the river bed when assessing sediment entrainment mechanics in the context of predicting bedload flux

Source

Article of periodic

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

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

Millesime : 2011, vol. 36, no12 [pp. 1680-1692]

Bibliographic references : 2 p.

Collation : 7 fig., 3 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.2192

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2012
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