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(Article of periodic en Anglais - 2014)

Document title

Particle velocity and concentration profiles in bedload experiments on a steep slope

Authors(s) and Affiliation(s)

FREY P. (1) ;
(1) IRSTEA, UR ETGR, Saint Martin d'Hères, FRANCE

Abstract

Depth profiles of particle streamwise velocity, concentration and bedload sediment transport rate were measured in a turbulent and supercritical water flow. Flows were filmed from the side by a high-speed camera. Particle tracking algorithms made it possible to determine the position, velocity and trajectory of a very large number of particles. Approximately half of the sediment transport rate was composed by rolling grains, and the other half by saltation. This revealed a complex structure, with several concentration and flux peaks due to rolling, and one peak due to saltation. With an increase of the sediment transport rate, the depth structure remained the same at the water/granular interface, with peak value increases but with no shift in elevations. The saltation region expanded towards higher elevations with an increase of the particle velocity commensurate to the water velocity. The proportion of the sediment transport rate in saltation did not vary significantly. The particle streamwise velocity profiles exhibited 3 segments : an exponential decay in the bed, a linear increase where rolling and saltation co-existed, and above this, a logarithmic-like shape due to saltating particles

Source

Article of periodic

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

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

Millesime : 2014, vol. 39, no5 [pp. 646-655]

Bibliographic references : 1 p.

Collation : 8 fig., 1 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3517

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
Refdoc record number (ud4) : 28518793 : Permanent link - XML version
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