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Flow fields in tightly curving meander bends of low width-depth ratio

Auteur(s) et Affiliation(s)

NANSON, R.A.
Univ. of New South Wales, Canberra, Australie


Description :
This paper documents the flow structures that result from the unsually narrow cross-sectional geometries and highly sinuous peatland changes at Barrington Tops (200 km north of Sydney) at flows measured up to bankfull. Two subsets of these bends were examined in relation to their patterns of cross-stream flow relative to the channel boundary. In these channels, separation zones are important for protecting both the channel bed and banks from scour. Three-dimensional near bankfull flow fields are presented for one bend with a meander pool; inward shifting of the maximum velocity filaments and limited sediment supply are proposed as mechanisms for the development and maintenance of these features. These flow data in narrow and deep peatland channels demonstrate very different flow patterns and morphological characteristics relative to the more commonly studied wide, shallow channels with more abundant sediment.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2010, vol. 35, n°. 2, p. 119-135, nombre de pages : 17, Références bibliographiques : 64 ref.

Date :
2010

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

Langue :
Anglais
Droits :
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