Results 261 to 270 of about 199,649 (303)

Bed-Load Transport. I: Mechanical Characteristics

Journal of Hydraulic Engineering, 1996
This paper deals with the mechanical characteristics of saltation of bed-load transport in flowing water. Experiments have been carried out by means of high-speed photography and advanced data-processing techniques. Taking saltation as the mode of bed-load transport, systematic analysis has been made with regard to the forces acting on grains and the ...
Chunhong Hu, Yujia Hui
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Bed Load Transport under Complex Flow

Advanced Materials Research, 2011
In this paper, the backward-facing step flow and the sediment transport downstream step were studied experimentally. The critical incipient bed shear velocity is obtained by the results of bed shear velocity and sediment incipient probability. It was found that the critical incipient bed shear velocity depends on the flow structures under the complex ...
Chun Rong Liu, Dao Lin Xu
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BED LOAD TRANSPORT OF BIMODAL SEDIMENTS

ISH Journal of Hydraulic Engineering, 2009
ABSTRACT Computation of bed load transport of bimodal sediments is a complicated task due to complex interaction of the grain sizes in two modes. The data on bimodal sediments from the previous investigations is used to check the performance of existing method which is based on data of unimodal and weakly bimodal sediments (Patel et al., 1996). Further,
P. L. Patel, Mayank Jain
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Bed-Load Transport. II: Stochastic Characteristics

Journal of Hydraulic Engineering, 1996
This paper deals with the stochastic characteristics of the saltation of bed-load transport. The trajectories of particles with different specific gravity are measured by high-speed photographic technique, and the experiments on bed-load transport processes also have been conducted.
Chunhong Hu, Yujia Hui
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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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Calculating bed load transport in steep boulder bed channels

Water Resources Research, 2007
Steep, rough channels occupy a large fraction of the total channel length in mountainous regions. Most sediment mobilized on hillslopes must pass through these streams before reaching lower‐gradient channels. Steep channels have wide grain size distributions that are composed of finer, more mobile sediment and large, rarely mobile grains.
E. M. Yager, J. W. Kirchner, W. E. Dietrich   +2 more
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Estimators of alluvial bed load transport

Earth Surface Processes, 1977
The equilibrium stream represents a compromise between three tendencies: (i) to maximize grain size, (ii) to maximize quantity of bed load transported, and (iii) to minimize bed shear stress (which represents, among other things, water discharge).
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Bed‐Load and Suspended‐Load Transport of Nonuniform Sediments

Journal of Hydraulic Engineering, 1991
Methods are available for the computation of the bed-load and suspended-load transport rates of uniform sediments. However, limited studies exist for nonuniform sediments. These studies, in general, lack simplicity, and often make use of various correction factors to be read from a series of tables and graphs.
Prabhata K. Swamee, Chandra Shekhar P. Ojha   +1 more
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An Expression for Bed-Load Transportation

Journal of the Hydraulics Division, 1963
A formula for the calculation of bed-load transportation per unit time and per unit width of the flow is suggested. This formula is valid for steady and uniform turbulent flow and for bed material consisting of grains of equal size and shape. It is assumed that the laminar sublayer of the turbulent flow is smaller than the size of the grains, and that ...
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Bed load transport by natural rivers

Water Resources Research, 1977
Since stream power ω and sediment transport rate i are different values of the same physical quantity, namely, the time rate of energy supply and dissipation, it is rational to relate one to the other. The experimental relation has been difficult to interpret because of the spurious curvature of log‐log plots in which a constant threshold stream power ...
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