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Representing the bed roughness of coarse-grained streams in computational fluid dynamics

Auteurs :
CARNEY, S.K.
BLEDSOE, B.P.
GESSLER, D.

Description :
Adequately characterizing the effects of gravel and cobble beds on flow hydraulics in computational fluid dynamics (CFD) is a difficult challenge due to the scale of roughness lengths and the inadequacy of traditional roughness representations to characterize flow profiles in situations with large roughness elements. An alternative method of representing gravel and cobble beds is presented. Appropriate drag forces associated with different grain sizes are computed and included in the momentum equations to account for the influence of a hydraulically rough bed. Comparisons with field measurements reveal reasonable agreement between measured and modelled profiles of spatially averaged velocity and turbulent kinetic energy.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2006, vol. 31, n°. 6, p. 736-749, nombre de pages : 14, Collation : Illustration, Références bibliographiques : 38 ref.

Date :
2006

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

Langue :
Anglais
Droits :
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