The anastomosing pattern and the extensively distributed scroll bars in the middle Amazon River
The middle Amazon River, between the confluences of the Negro and Madeira Rivers in Brazil, shows an anastomosing morphology with relatively stable, multiple interconnected channels that locally enclose floodbasins. The AA. analyzed sedimentary processes using field data, morphology and channel changes trough a temporal analysis using remote sensing data and obtained optically stimulated luminescence (OSL) dating to understand the genesis of this large anastomosing river and the development of its meandering secondary channels. Differences in resistance to erosion control the relatively straight main channel and allow secondary channels to develop a meandering platform. Vegetation contributes to the relative stability of islands and the floodplain. Low gradient and high average aggradation rate are conditions which favor the development of anastomosis.
Article of periodic
published at : Earth surface processes and landforms / ISSNÂ 0197-9337 / CODENÂ ESPLDB
Editor : Wiley, Chichester - ROYAUME-UNI (1981)
Millesime : 2012,Â vol.Â 37,Â no14Â [pp.Â 1471-1488]
Bibliographic references : 2 p.
Collation : 11 fig., 3 tabl.
INIST-CNRS, Cote INIST : 17355
Go to electronic document thanks to its DOI : doi:10.1002/esp.3249