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A two-dimensional morphodynamic model of gravel-bed river with floodplain vegetation

Auteur(s) et Affiliation(s)

LI, S.S.
Department of Building, Civil and Environmental Engineering, Concordia Univ., Montreal, Canada
MILLAR, R.G.
Department of Civil Engineering, Univ. of British Columbia, Vancouver, Canada


Description :
In this paper account is taken of the effects of riparian and floodplain vegetation on bank strength, floodplain flow resistance, shear stress partitioning, and bedload transport. This is incorporated into an existing 2D hydrodynamic-morphological model. By applying the new model to an initially straight and single-threaded channel, the way that its planform and cross-sectional geometry evolve for different hydraulic and floodplain vegetation conditions is demonstrated. The results show the formation and upstream migration of gravel bars, confluence scouring and the development of meandering and braiding channel patterns. In cases where the channel becomes unstable, the instability grows out of bar formation. The resulting braiding patterns are similar to analytical results. The formation of a transition configuration requires a strong influence from vegetation.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 2, p. 190-202, nombre de pages : 13, Références bibliographiques : 55 ref.

Date :
2011

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

Langue :
Anglais
Droits :
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