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

Cook, Kristen L. and Turowski, Jens M. and Hovius, Niels (2013) A demonstration of the importance of bedload transport for fluvial bedrock erosion and knickpoint propagation. Earth Surface Processes and Landforms, 38 (7). pp. 683-695. ISSN 0197-9337, ESSN: 1096-9837 DOI 10.1002/esp.3313

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/esp.331...

Abstract

We provide field evidence for the role of bedload in driving fluvial incision and knickpoint propagation. Using aerial photographs, field surveys, and hydrological data, we 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 five 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. Once bedload tools became available, 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. Copyright © 2012 John Wiley & Sons, Ltd.

Item Type: Article
Uncontrolled Keywords: 2013AREP, IA66,
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Earth Surface Processes and Landforms
Volume: 38
Page Range: pp. 683-695
Identification Number: 10.1002/esp.3313
Depositing User: Sarah Humbert
Date Deposited: 07 Jul 2013 02:06
Last Modified: 08 Aug 2013 12:12
URI: http://eprints.esc.cam.ac.uk/id/eprint/2828

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