Results 171 to 180 of about 1,541 (218)
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Journal of the Hydraulics Division, 1976
A simple derivation of the bed-load function has been presented. It was shown that the jump length of detached particles need not be assumed constant, and by treating it as a random variable, that it is only its mean value that influences the rate of transport regardless of what its probability density function may be.
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A simple derivation of the bed-load function has been presented. It was shown that the jump length of detached particles need not be assumed constant, and by treating it as a random variable, that it is only its mean value that influences the rate of transport regardless of what its probability density function may be.
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Sedimentology, 1972
ABSTRACTApplication of sieve and size‐shape analyses (Moss, 1962) to natural and artificial bed‐load deposits of shallow, unidirectional currents revealed that a textural sequence parallels one of primary structures. With increasing grain size and/or transporting power, sedimentary characteristics followed the stepwise pattern: fine ripple bed stage ...
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ABSTRACTApplication of sieve and size‐shape analyses (Moss, 1962) to natural and artificial bed‐load deposits of shallow, unidirectional currents revealed that a textural sequence parallels one of primary structures. With increasing grain size and/or transporting power, sedimentary characteristics followed the stepwise pattern: fine ripple bed stage ...
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Journal of Hydraulic Engineering, 1992
A methodology is developed for evaluation of bed-load transport based on the analytical solution presented in a previous publication. The present-day knowledge of this subject is such that it required empirical determined coefficients to evaluate bed-load transport.
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A methodology is developed for evaluation of bed-load transport based on the analytical solution presented in a previous publication. The present-day knowledge of this subject is such that it required empirical determined coefficients to evaluate bed-load transport.
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1999
Following on the discussions of patterns of sediment motion and its initiation in Chapters 5 and 8, this chapter introduces various theories and formulas of bed load motion. The first section treats theories and formulas for uniform bed load, and the second and the third sections discuss the effects of non-uniformity of particle size on the transport ...
Ning Chien, Zhaohui Wan
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Following on the discussions of patterns of sediment motion and its initiation in Chapters 5 and 8, this chapter introduces various theories and formulas of bed load motion. The first section treats theories and formulas for uniform bed load, and the second and the third sections discuss the effects of non-uniformity of particle size on the transport ...
Ning Chien, Zhaohui Wan
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Suspended load and bed load in irrigation furrows
CATENA, 2005Abstract The circulation of water in irrigation furrows is a well-understood physical process. However, theoretical understanding of sediment dynamics is less well established. This study assesses an approach to determine the sediment load in irrigation furrows, involving the use of a suction device for sampling water with suspended sediments at ...
Luciano Mateos, Juan V. Giráldez
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Bed load sheets and bed load fluctuation in gravel bed experiments
2007The purpose of this research was to investigate the effects of grain sorting on bed load. Flume experiments were performed over graded sediment, for long durations, and a wide range of flow conditions. No equilibrium slope was obtained whatever the run and the experiment duration (up to more than 60 hours).
Recking, A., Paquier, André, Frey, P.
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Principle of equivalency of bed structures and bed load motion
International Journal of Sediment Research, 2012Abstract Step-pool systems and cobble clusters are structures composed of boulders and cobbles on mountain streambeds rearranged by flood flow to reach high resistance and high bed stability. Both bed structures and bed load motion can protect the riverbed from incision.
Zhao-yin WANG, Kang ZHANG
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2014
The mode of sediment transport where the sediment particles slide, roll, or travel in succession of low jumps close to the bed is known as bed-load transport. In this chapter, theories of bed-load and formulations to predict the bed-load transport rate are presented. The pioneering attempt to predict the bed-load transport rate was due to MP du Boys in
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The mode of sediment transport where the sediment particles slide, roll, or travel in succession of low jumps close to the bed is known as bed-load transport. In this chapter, theories of bed-load and formulations to predict the bed-load transport rate are presented. The pioneering attempt to predict the bed-load transport rate was due to MP du Boys in
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Sand Bed Instability Due to Bed Load Motion
Journal of the Hydraulics Division, 1980Kennedy clarified that the lag of sediment transport for bed form plays an important role for sand bed instability, but this lag could not been evaluated quantitatively to date. In this study, the role and constitution of the lag has been clarified by inspecting the instability analysis compared with theory of bed load transport process.
Hiroji Nakagawa, Tetsuro Tsujimoto
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Variability of bed load measurement
Water Resources Research, 1988The sampling efficiencies of two slightly different Helley‐Smith‐type bed load samplers were compared under carefully controlled field conditions. The samplers were identical in all respects except for the thickness of the metal used in their construction.
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