The influence of roughness geometry and shields parameter on flow resistance in gravel-bed channels

Auteur(s) et Affiliation(s)



Description :
The spatial variability of bed particles of a gravel-bed channel is analysed and treated experimentally in order to simulate the effects of the arrangement of coarse bed elements on the flow resistance law. The differences between the experimental friction factor parameter values and the ones calculated by the proposed semi-logarithmic relationship are explained by the ratio between the Shields parameter and its critical value. The analysis shows that estimates of the friction factor parameter are not improved by introducing the Froude number into the flow resistance law.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 1997, vol. 22, n°. 8, p. 759-772, Collation : Illustration, Références bibliographiques : 44 ref.

Date :
1997

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