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(Article of periodic en Anglais - 2013)

Document title

A demonstration of the importance of bedload transport for fluvial bedrock erosion and knickpoint propagation

Authors(s) and Affiliation(s)

COOK K.L. (1) ; TUROWSKI J.M. (2) ; HOVIUS N. (3) ;
(1) Dept. of Geosciences, National Taiwan Univ., Taipei, TAIWAN, PROVINCE DE CHINE
(2) Swiss Federal Research Inst. WSL, Birmensdorf, SUISSE
(3) Dept. of Earth Sciences, Univ., Cambridge, ROYAUME-UNI

Abstract

Using aerial photographs, field surveys, and hydrological data, the AA. constrain the incision history of a bedrock gorge 1200 m long and up to 20 m deep cut by Da'an River in western Taiwan. This reach of the river experienced 10 m of uplift during the 1999 Chi-Chi earthquake. For 5 years following the earthquake, bedload was prevented from entering the uplift zone, the knickpoint was static and little incision took place. Bedload transport across the uplift zone resumed in 2004, initiating extremely rapid incision, with 620 m of knickpoint propagation and up to 20 m of downcutting by 2008. This change highlights the relative inefficiency of suspended sediment and the dominant role of bedload as a tool for fluvial erosion and knickpoint propagation. Knickpoint propagation was influenced by geological structure, lithology, and drainage organization. In particular, a change in dip of the sandstone beds at the site caused a decrease of knickpoint propagation velocity

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, no7 [pp. 683-695]

Bibliographic references : 2 p.

Collation : 10 fig., 3 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3313

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