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Bedload transport resistance in rough open‐channel flows
Author(s) -
Gao Peng,
Abrahams Athol D.
Publication year - 2004
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.1038
Subject(s) - bed load , geology , hyperconcentrated flow , sediment transport , mechanics , turbulence , open channel flow , shear stress , dimensionless quantity , geotechnical engineering , geomorphology , sediment , physics
During bedload movement by saltation, streamwise momentum is transferred from the ow to the saltating grains. When the grains collide with other grains on the bed or in the ow, streamwise momentum is reduced, and there is a decrease in streamwise ow velocity and an increase in ow resistance, herein termed bedload transport resistance f bt . Based on experiments in two umes with xed and mobile plane beds and previously published data, an equation is developed that may be used to predict f bt for both capacity and non‐capacity ows. The variables in this equation are identied by dimensional analysis and the coefcients are determined by non‐linear regression. This equation applies to rough turbulent open‐channel ows, where the relative submergence is between 1 and 20 and the entire sediment load moves by saltation. An investigation of the relative magnitudes of f bt and grain resistance f c suggests that where dimensionless shear stress θ is less than 1 and saltation is the dominant mode of bedload transport, f bt /f c increases with θ but never exceeds 1. Copyright © 2004 John Wiley & Sons, Ltd.