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Bed morphology and generation of step-pool channels

Auteur(s) et Affiliation(s)

WEICHERT, R.B.
Beller Consult, Freiburg, Allemagne
BEZZOLA, G.R.
Federal Office for the Environment, FOEN, Bern, Suisse
MINOR, H.-E.
Lab. of Hydraulics, Hydrology and Glaciology, Zurich, Suisse


Description :
In this paper the results of the flume study are presented that focus on bed morphology and the generation of step-pool channels. In contrat to a number of other flume studies, the generation and configuration of steps and pools was studied with regard to its dependence on flume width. These results suggest that the bed roughness geometry develops towards a condition that provides the maximum bed stability for a given grain size distribution. In contrast to a variety of other studies, antidunes did not contribute to the generation of the step structures. However, the data of the presented study fits well into the region of antidune formation proposed by Kennedy for sand-bed rivers. The considerations of the Kennedy region of antidune formation and the analysis of planform step types depending on stream power both suggest that steep channels have a potential for self-stabilization by modifying the step-pool structure towards a geometry that provides maximum flow resistance and maximum bed stability.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2008, vol. 33, n°. 11, p. 1678-1692, nombre de pages : 15, Références bibliographiques : 2 p.

Date :
2008

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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