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(Article of periodic en Anglais - 2013)

Document title

Discrimination of alluvial and mixed bedrock–alluvial multichannel river networks

Authors(s) and Affiliation(s)

MESHKOVA L.V. (1) ; CARLING P.A. (1) ;
(1) Geography and Environment, Univ., Southampton, ROYAUME-UNI

Abstract

This paper explores the use of planview morphological metrics to quantitatively describe and distinguish mixed bedrock–alluvial multichannel networks from alluvial multichannel networks. The geometries of the channel planforms of 2 bedrock-constrained networks (Mekong and Orange rivers) are compared with the classic alluvial anastomosed Upper Columbia River and the wandering Ganga River. Widely recognized indices utilized include : channel link count and channel sinuosity, and less common metrics : network bifurcation angles and island shape characteristics (aspect ratio, compactness, roundness and convexity). Bifurcation angles for all 4 multichannel rivers are significantly greater than angles reported for braiding rivers. Island convexity clearly discriminates the 2 alluvial rivers from the 2 bedrock-influenced rivers. The width of the macrochannel, in which each network develops, has a positive influence on the number of channel links and is further related to channel slope variations. The geometry of multichannel networks are often laterally constrained

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, no11 [pp. 1299-1361]

Bibliographic references : 2 p.

Collation : 15 fig., 5 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3417

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