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(Article of periodic en Anglais - 2008)

Document title

An experimental test of whether bar instability contributes to the formation, periodicity and maintenance of pool-riffle sequences

Authors(s) and Affiliation(s)

WILKINSON S.N. (1 2) ; RUTHERFURD I.D. (2 3) ; KELLER R.J. (4) ;
(1) CSIRO Land and Water, Aitkenvale, QLD, AUSTRALIE
(2) Water Cooperative Research Centre, Univ., Canberra, AUSTRALIE
(3) University of Melbourne, School of Anthropology, Geography and Environmental Studies, Carlton, VIC, AUSTRALIE
(4) Dept. of Civil Engineering, Univ., Monash, VIC, AUSTRALIE

Abstract

Pool-riffle sequences (PRSs) are periodic river-bed morphologies with wavelengths several times the channel width. In this paper, the AA. investigate whether the bar instability forming alternate bars also contributes to PRS formation, periodicity and maintenance. The physical model was scaled from a prototype PRS in a gravel and cobble bed river. The model showed that maintenance of the bar height in the prototype PRS also depends on variations in channel width. It is concluded that periodic PRSs are formed and maintained by the interaction between bar instability, and flow deflections associated with variations in channel geometry such as width variation. Variations in channel geometry are also important in determining the location and dimensions of individual pools and bars

Source

Article of periodic

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

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

Millesime : 2008, vol. 33, no11 [pp. 1742-1756]

Bibliographic references : 2 p.

Collation : 9 fig., 4 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.1645

Prodig - Bibliographie Géographique Internationale (BGI)
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