Sediment-Laden Flow in Open Channels from Two-Phase Flow Viewpoint
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Volume 121, Issue 10
Abstract
Most existing analytical and mathematical models for sediment-laden flows are based on the governing equations for single-phase flows, and are valid only for low sediment concentration situations. This paper presents an analysis, on the basis of the fundamental equations for fluid-solid two-phase flows, of the velocity and sediment concentration profiles in open-channel flows. A new diffusion equation is established for suspended sediment concentration from a rigorous derivation of the water-sediment mixture's normal velocity in the sense of mass flux conservation. The differences between this new equation and Schmidt's as well as Hunt's are shown to be attributable to the different approximations of sediment velocity. Previous formulations for velocity and sediment concentration distributions are special cases of the present model for low sediment concentration flows. The developed model is extensively tested against available measurements, and satisfactory or fairly good agreement is obtained.
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Published In
Journal of Hydraulic Engineering
Volume 121 • Issue 10 • October 1995
Pages: 725 - 735
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Copyright © 1995 American Society of Civil Engineers.
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Published online: Oct 1, 1995
Published in print: Oct 1995
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