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(Article of periodic en Anglais - 2009)

Document title

Assessing the effect of vegetation-related bank strength on channel morphology and stability in gravel-bed streams using numerical models

Authors(s) and Affiliation(s)

EATON B.C. (1) ; GILES T.R. (2) ;
(1) Geography Dep., Univ. British Columbia, Vancouver, CANADA
(2) B.C. Ministry of Forests and Range, Kamloops, CANADA

Abstract

Bank strength due to vegetation dominates the geometry of small stream channels, but has virtually no effect on the geometry of larger ones. A rational regime model is used to explore the scale effects: it parameterizes vegetation-related bank strength using a dimensionless effective cohesion, Cr*. The analyses show that the effect of vegetation on both downstream hydraulic geometry and the meandering-braiding threshold is strongest for the smallest streams in a watershed, but that the effect disappears for Q* > 106. The analysis of the migration threshold suggests that the critical discharge ranges from about 5 m3/s to 50 m3/s, depending on the characteristic rooting depth for the vegetation. The analysis also suggests that, where fires frequently affect riparian forests, channels may alternate between laterally stable gravel plane-bed channels and laterally active riffle-pool channels

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2009, vol. 34, no5 [pp. 712-724]

Bibliographic references : 1,5 p.

Collation : 10 fig., 1 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.1768

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2009
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