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(Article of periodic en Anglais - 2010)

Document title

The influence of sediment size, relative grain size and channel slope on initiation of sediment motion in boulder bed rivers. A lichenometric study

Authors(s) and Affiliation(s)

GOB F. (1) ; BRAVARD J.-P. (2) ; PETIT F. (3) ;
(1) Cemagref, Hydrosystem and Bioprocesses, Antony, FRANCE
(2) Univ. Lyon 2, Bron, FRANCE
(3) Dep. of Geography, Univ., Liège, BELGIQUE

Abstract

Using size frequency diagrams and regional growth curves calibrated with dated reference points it is possible to determine the flood event responsible for the last mobilization of each boulder with lichens present. The specific stream power of flood events over the last 60 years is then calculated, and thresholds of sediment transport based on the sediment size are calculated. The results from the 4 studied rivers are compared to similar relationships in the literature. Sediment motion thresholds appear to be very variable within the same type of river (mountainous boulder bed rivers). The critical specific stream power necessary to mobilize a particle of a given diameter may vary by up to 10 times from one river to the next. Bed sediment size and river slope may explain this large range of stream powers

Source

Article of periodic

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

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

Millesime : 2010, vol. 35, no13 [pp. 1535-1547]

Bibliographic references : 1 p.

Collation : 7 fig., 6 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.1994

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