TECHNICAL PAPERS
Jan 15, 2003

Surface-based Transport Model for Mixed-Size Sediment

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Publication: Journal of Hydraulic Engineering
Volume 129, Issue 2

Abstract

We present a transport model for mixed sand/gravel sediments. Fractional transport rates are referenced to the size distribution of the bed surface, rather than subsurface, making the model completely explicit and capable of predicting transient conditions. The model is developed using a new data set of 48 coupled observations of flow, transport, and bed surface grain size using five different sediments. The model incorporates a hiding function that resolves discrepancies observed among earlier hiding functions. The model uses the full size distribution of the bed surface, including sand, and incorporates a nonlinear effect of sand content on gravel transport rate not included in previous models. The model shares some common elements with two previous surface-based transport models, but differs in using the full surface size distribution and in that it is directly developed from a relatively comprehensive data set with unambiguous measurement of surface grain size over a range of flow, transport rate, and sediments.

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Information & Authors

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Published In

Go to Journal of Hydraulic Engineering
Journal of Hydraulic Engineering
Volume 129Issue 2February 2003
Pages: 120 - 128

History

Received: Jul 30, 2001
Accepted: Oct 1, 2002
Published online: Jan 15, 2003
Published in print: Feb 2003

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Authors

Affiliations

Peter R. Wilcock, M.ASCE
Professor, Dept. of Geography and Environmental Engineering, Johns Hopkins Univ., Baltimore, MD 21218.
Joanna C. Crowe
Graduate Student, Dept. of Geography and Environmental Engineering, Johns Hopkins Univ., Baltimore, MD 21218.

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