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Experimental evidence for fluvial bedrock incision by suspended and bedload sediment

Scheingross, Joel S. and Brun, Fanny and Lo, Daniel Y. and Omerdin, Khadijah and Lamb, Michael P. (2014) Experimental evidence for fluvial bedrock incision by suspended and bedload sediment. Geology, 42 (6). pp. 523-526. ISSN 0091-7613. http://resolver.caltech.edu/CaltechAUTHORS:20140904-093103105

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Abstract

Fluvial bedrock incision sets the pace of landscape evolution and can be dominated by abrasion from impacting particles. Existing bedrock incision models diverge on the ability of sediment to erode within the suspension regime, leading to competing predictions of lowland river erosion rates, knickpoint formation and evolution, and the transient response of orogens to external forcing. We present controlled abrasion mill experiments designed to test fluvial incision models in the bedload and suspension regimes by varying sediment size while holding fixed hydraulics, sediment load, and substrate strength. Measurable erosion occurred within the suspension regime, and erosion rates agree with a mechanistic incision theory for erosion by mixed suspended and bedload sediment. Our experimental results indicate that suspension-regime erosion can dominate channel incision during large floods and in steep channels, with significant implications for the pace of landscape evolution.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://geology.gsapubs.org/content/42/6/523.abstractPublisherArticle
http://dx.doi.org/10.1130/G35432.1DOIArticle
ORCID:
AuthorORCID
Brun, Fanny0000-0001-6607-0667
Lamb, Michael P.0000-0002-5701-0504
Additional Information:© 2014 Geological Society of America. Manuscript received 2 January 2014. Revised manuscript received 18 March 2014. Manuscript accepted 21 March 2014. First published online April 10, 2014. We thank Leonard Sklar for enlightening discussions and donation of an abrasion mill, and Chris Borstad for conversations on fracture mechanics. Brandon McElroy kindly measured our fi ne sediment sizes, and Brian Fuller built the abrasion mills. Discussion with Roman DiBiase, reviews from Phairot Chatanatavet, Nicole Gasparini, Leslie Hasbargen, Leonard Sklar, and an anonymous reviewer, and editorial comments from James Spotila greatly improved this manuscript. Support came from a National Science Foundation (NSF) Graduate Research Fellowship to Scheingross, NSF grant EAR-1147381 grant to Lamb, and a California Institute of Technology Summer Undergraduate Research Fellowship to Lo.
Funders:
Funding AgencyGrant Number
NSF Graduate Research FellowshipUNSPECIFIED
NSFEAR-1147381
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
Record Number:CaltechAUTHORS:20140904-093103105
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140904-093103105
Official Citation:Joel S. Scheingross, Fanny Brun, Daniel Y. Lo, Khadijah Omerdin, and Michael P. Lamb Experimental evidence for fluvial bedrock incision by suspended and bedload sediment Geology, June 2014, v. 42, p. 523-526, first published on April 10, 2014, doi:10.1130/G35432.1
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49227
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:04 Sep 2014 19:08
Last Modified:01 Sep 2017 17:33

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