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(Article of periodic en Anglais - 2012)

Document title

Evaluating competing hypotheses for the origin and dynamics of river anastomosis

Authors(s) and Affiliation(s)

KLEINHANS M.G. (1) ; DE HAAS T. (1) ; LAVOOI E. (1) ; MALASKE B. (2) ;
(1) Fac. of Geosciences, Dep. of Physical geography, Univ., Utrecht, PAYS-BAS
(2) Alterra, Univ. and Research Centre, Wageningen, PAYS-BAS

Abstract

The AA. test hypotheses on morphodynamic scenario modelling and data of the upper Columbia River. Initial and boundary conditions for the modelling were derived from field data. A 1D network model was built based on gradually varied flow equations, sediment transport prediction, mass conservation, transverse slope and spiral meander flow effects at the bifurcations. The number of channels and crevasse splays decreases in a downstream direction. These observations concur with bed sediment overloading from upstream, which can have caused channel aggradation above the surrounding floodplain and subsequent avulsion. The modelling also indicates that avulsion was likely caused by upstream overloading. In the model, multi-channel systems inevitably evolve towards single-channel systems within centuries because symmetric channel bifurcations are inherently unstable. The AA. conclude that this anastomosing pattern is the result of time-varying sediment overloading and is not an equilibrium pattern feature

Source

Article of periodic

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

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

Millesime : 2012, vol. 37, no12 [pp. 1337-1351]

Bibliographic references : 30 ref.

Collation : 13 fig.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3282

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2013
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