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Sediment patches, sediment supply, and channel morphology

Dietrich, W. E. and Nelson, P. A. and Yager, E. and Venditti, J. G. and Lamb, M. P. and Collins, L. (2006) Sediment patches, sediment supply, and channel morphology. In: River, Coastal, and Estuarine Morphodynamics. Vol.1. Taylor & Francis , London, pp. 79-90. ISBN 9780415392709.

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Bed surface particle size patchiness may play a central role in bedload and morphologic response to changes in sediment supply in gravel-bed rivers. Here we test a 1-D model (from Parker ebook) of bedload transport, surface grain size, and channel profile with two previously published flume studies that documented bed surface response, and specifically patch development, to reduced sediment supply. The model over predicts slope changes and under predicts average bed surface grain size changes because it does not account for patch dynamics. Field studies reported here using painted rocks as tracers show that fine patches and coarse patches may initiate transport at the same stage, but that much greater transport occurs in the finer patches. A theory for patch development should include grain interactions (similar size grains stop-ping each other, fine ones mobilizing coarse particles), effects of boundary shear stress divergence, and sort-ing due to cross-stream sloping bed surfaces.

Item Type:Book Section
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Lamb, M. P.0000-0002-5701-0504
Additional Information:© 2006 Taylor & Francis Group, London. This work was supported in part by the California Water Resources Center and the NSF National Center for Earth Surface Dynamics.
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California Water Resources CenterUNSPECIFIED
Record Number:CaltechAUTHORS:20130307-142351272
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37380
Deposited By: Tony Diaz
Deposited On:12 Apr 2013 22:16
Last Modified:03 Oct 2019 04:47

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