Results 261 to 270 of about 501,373 (309)

Bed Load Sampler for Streams with Sandy Bed

Journal of the Hydraulics Division, 1977
The cumulative nature of sedimentation processes often raises difficulties in the design of many water engineering projects. Quantitative estimation of the transportation phenomena is therefore of utmost importance if serious operational disturbances are to be avoided.
Arie Racotch, Ram Sagi
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Sand Bed Instability Due to Bed Load Motion

Journal of the Hydraulics Division, 1980
Kennedy 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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Suspended load and bed load in irrigation furrows

CATENA, 2005
Abstract 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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Calibration of Bed-Load Samplers

Journal of the Hydraulics Division, 1980
In this paper, a dimensionless equation to define the trapping efficiency of bed-load samplers is presented. Limited data from the literature was used to identify one independent variable which may be of prime importance in determining trapping efficiency.
Peter Engel, Y. Lam Lau
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Bed-Load Transport

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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Bed load sheets and bed load fluctuation in gravel bed experiments

2007
The 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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The Bed-Load Function

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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Bed-load through emergent vegetation

Advances in Water Resources, 2019
Abstract The paper deals with bed-load rates in a mobile bed channel with emerging vegetation. We have adapted the probabilistic/deterministic sediment transport model of Armanini et al. (2015) to account for changes in the flow field induced by vegetation.
Aronne Armanini, Valentina Cavedon
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Helley-Smith Bed Load Samplers

Journal of the Hydraulics Division, 1977
This paper reports findings and experiences in using Helley-Smith bed load samplers in streams on the Reynolds Creek Experimental Watershed in southwest Idaho. Equipment and procedures developed in sampling during peak streamflow evens are described.
Clifton W. Johnson, Clayton L. Hanson, Jeffrey P. Smith, Roger L. Engleman   +3 more
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Variability of bed load measurement

Water Resources Research, 1988
The 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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