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(Article of periodic en Anglais - 2013)

Document title

Formation of a cohesive floodplain in a dynamic experimental meandering river

Authors(s) and Affiliation(s)

VAN DIJK W.M. (1) ; VAN DE LAGEWEG W.I. (1) ; KLEINHANS M.G. (1) ;
(1) Fac. of Geosciences, Univ., Utrecht, PAYS-BAS

Abstract

The AA. aim to understand how different styles of floodplain formation such as overbank deposition and lateral accretion cause narrower channels and prevent chute cutoffs that lead to meandering. They present 2 experiments with a self-forming channel in identical conditions, but to one they added cohesive silt at the upstream boundary. The effect of cohesive silt on bank stability was tested in auxiliary bank erosion experiments and showed that an increase in silt reduced erosion rates by a factor of 2. The experiment without silt developed to a braided river by continuous and extensive shifting of multiple channels. In contrast, in the meandering river silt deposits increased bank stability of the cohesive floodplain and resulted in a reduction of chute cutoffs and increased sinuosity by continuous lateral migration of a single channel. Overbank flow led to deposition of the silt and 2 styles of cohesive floodplain were observed. The first style led to a reduction in bank erosion, while the second style reduced excavation of chutes. The AA. conclude that sedimentation of fine cohesive material on the floodplain by discharge exceeding bankfull is a necessary condition for meandering

Source

Article of periodic

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

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

Millesime : 2013, vol. 38, no13 [pp. 1550-1565]

Bibliographic references : 2 p.

Collation : 15 fig., 3 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3400

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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