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P. Komar (1987)
Selective grain entrainment by a current from a bed of mixed sizes; a reanalysisJournal of Sedimentary Research, 57
C. Neill, M. Yalin (1969)
Quantitative Definition of Beginning of Bed MovementJournal of Hydraulic Engineering, 95
P. Wilcock, J. Southard (1988)
Experimental study of incipient motion in mixed‐size sedimentWater Resources Research, 24
P. Wiberg, J. Smith (1987)
Calculations of the critical shear stress for motion of uniform and heterogeneous sedimentsWater Resources Research, 23
P. Wilcock (1987)
Bed-load transport of mixed-size sediment
R. Milhous (1973)
Sediment transport in a gravel-bottomed stream
Komar Komar (1987)
Selective grain entrainment by a current from a bed of mixed sizes: A reanalysisJ. Sediment. Petrol., 57
The bedload function for sediment transport in open channel flows
(1968)
A reexamination of the beginning of movement for coarse granular bed materials
Martin Miller, I. McCave, P. Komar (1977)
Threshold of sediment motion under unidirectional currentsSedimentology, 24
P. Ackers, W. White (1973)
Sediment Transport: New Approach and AnalysisJournal of Hydraulic Engineering, 99
P. Carling (1983)
Threshold of coarse sediment transport in broad and narrow natural streamsEarth Surface Processes and Landforms, 8
F. Hammond, A. Heathershaw, D. Langhorne (1984)
A comparison between Shields' threshold criterion and the movement of loosely packed gravel in a tidal channelSedimentology, 31
R. Luque (1976)
Erosion And Transport Of Bed-Load SedimentJournal of Hydraulic Research, 14
E. Andrews, D. Erman (1986)
Persistence in the Size Distribution of Surficial Bed Material During an Extreme Snowmelt FloodWater Resources Research, 22
G. Parker, P. Klingeman, D. McLean (1983)
Bedload and Size Distribution in Paved Gravel-Bed StreamsJournal of Hydraulic Engineering, 108
E. Andrews (1983)
Entrainment of gravel from naturally sorted riverbed materialGeological Society of America Bulletin, 94
N. Chien, Zhaohui Wan (1984)
Solar Heating and Cooling: Active and Passive Design, 2nd edn. By JANF. KRIEUER and FRANK KREITH. Hemisphere, 1982. 479 pp., £27.95.Journal of Fluid Mechanics, 140
T. Day (1980)
A Study of Initial Motion Characteristics of Particles in Graded Bed Materials
Two methods are commonly used to estimate the critical shear stress of individual fractions in mixed‐size sediment, one using the largest grain displaced, the other using the shear stress that produces a small value of transport rate for each fraction. The initial‐motion results produced by the two methods are typically different: largest‐grain critical shear stresses vary with roughly the square root of grain size, and reference transport critical shear stresses show little variation with grain size. Comparison of the two methods is seldom possible because both methods can rarely be applied to the same data. The one case known for which both methods can be used suggests that the typical differences in initial‐motion results reflect more methodological influence than real differences in the initial motion of different sediments. Although the two classes of methods may not be directly compared, a general definition of initial‐motion in mixed‐size sediment is presented that allows the characteristic differences between the results to be explained in terms of sampling and scaling considerations inherent in the mixed‐size initial‐motion problem. The initial‐motion criterion defined also provides a rational basis for collecting comparable and reproducible data using the two classes of method.
Water Resources Research – Wiley
Published: Jul 1, 1988
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