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(Article of periodic en Anglais - 2013)

Document title

Large floods, alluvial overprint, and bedrock erosion

Authors(s) and Affiliation(s)

TUROWSKI J.M. (1) ; BADOUX A. (1) ; LEUZINGER J. (1 2) ; HEGGLIN R. (1 3) ;
(1) Swiss Federal Research Inst. WSL, Birmensdorf, SUISSE
(2) Marty Ingenieure AG, Schwändi, SUISSE
(3) Emch+Berger Holding AG, Bern, SUISSE

Abstract

Depending on their behaviour during extreme floods, streams can be divided into 2 distinct classes, which derive from a simple threshold model of transport dynamics. "Flood-cleaning" streams erode during high flows and deposit during small and medium flows. "Flood-depositing" streams deposit during high flows and erode during small and medium flows. Using published descriptions of the geomorphic effects of large floods, rivers with a wide range of drainage areas are classified as either "flood-cleaning" or "flood-depositing". In bedrock channels, this behaviour can lead to a feedback effect, the "overprint effect", between sediment transport processes and bedrock erosion, which can modulate long-term bedrock erosion rates. The "overprint effect" arises when alluvium covers the bedrock and typical alluvial channel forms (meandering or braiding patterns, armour layers or bedforms) develop, which influence sediment transport rates. The "overprint effect" is illustrated using field data from the Erlenbach, Switzerland, and its implications for channel dynamics and bedrock erosion are discussed

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, no9 [pp. 947-958]

Bibliographic references : 2 p.

Collation : 7 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.3341

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