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(Article of periodic en Anglais - 2014)

Document title

The effects of kinetic sorting on sediment mobility on steep slopes

Authors(s) and Affiliation(s)

BACCHI V. (1 2) ; RECKING A. (1 2) ; ECKERT N. (1 2) ; FREY P. (1 2) ; PITON G. (1 2) ; NAAIM M. (1 2) ;
(1) IRSTEA, ER ETGR, Centre de Grenoble, St-Martin d'Hères, FRANCE
(2) Univ. Grenoble Alpes, Grenoble, FRANCE

Abstract

The AA. hypothesized that kinetic sorting can be an important contributor to the morphodynamics of mountain streams and attempted to demonstrate this with new flume experiments. Two long runs were produced with natural poorly sorted sediments, and with different transport stages of the coarse fraction. Both runs produced an efficient transfer downstream of the injected material, but with a major difference : the first run (no kinetic sorting) produced permanent armour figuring clusters; the second run (with kinetic sorting) also produced bed armouring, but this armour was periodically totally destroyed, leading to substantial bed erosion. The consequence is that fine materials are hidden to the flow during aggradation, allowing the slope to attain values much steeper than would have been expected at equilibrium for the mixture. However, whereas the surface armouring tends to stabilize the bed, construction of a layer of fine sediments at the subsurface also contributes to making it very unstable. These 2 contradictory effects explain the complex bed behaviours and the existence of very large bedload and slope fluctuations

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, no8 [pp. 1075-1086]

Bibliographic references : 2 p.

Collation : 11 fig., 2 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3564

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
Refdoc record number (ud4) : 28681998 : Permanent link - XML version
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