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(Article of periodic en Anglais - 2012)

Document title

Upstream and downstream controls of recent avulsions on the Taquari megafan, Pantanal, south-western Brazil

Authors(s) and Affiliation(s)

MAKASQUE B. (1) ; MAATHUIS B.H.P. (2) ; PADOVANI C.R. (3) ; STOLKER C. (4) ; MOSSELMAN E. (4 5) ; JONGMAN R.H.G. (1) ;
(1) Alterra, Univ. and Research Centre, Wageningen, PAYS-BAS
(2) Dep. of Water Ressources, Fac. ITC, Univ. of Twente, Enschede, PAYS-BAS
(3) Embrapa Pantanal, Corumbá, BRESIL
(4) Dep. of River Dynamics and Inland Water Transport, Deltares, Delft, PAYS-BAS
(5) Fac. of Civil Engineering and Geosciences, Univ. of Technology, Delft, PAYS-BAS

Abstract

At present, 2 avulsions are occurring on the middle and lower Taquari megafan, Pantanal basin, south-western Brazil. Here the AA. present an analysis of the causes of these avulsions based on field and remote sensing data and show that avulsions on megafans can be controlled by both upstream and downstream processes. Avulsions are commonly supposed to be preferentially triggered by high-magnitude floods, when there is considerable channel-belt superelevation. However, both avulsions studied here were triggered by small to average floods, with modest channel-belt superelevation. The AA. conclude that flood magnitude and channel-belt superelevation have been overrated as causes of avulsion, and demonstrate additional causes that influence the growth of crevasses into avulsions

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. 1313-1326]

Bibliographic references : 1 p.

Collation : 15 fig., 2 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3278

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