Ultimate Sediment Concentration

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by V.. Miguel Ponce, San Diego State Univ, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering:

Abstract: The sediment rating curve is used to relate sediment discharge to water discharge, under steady equilibrium flow conditions. The slope of the sediment rating curve is a measure of the suspended bed material sediment concentration. In this paper, the suspended bed material sediment concentration is referred to as sediment concentration, and it specifically excludes wash load. Typical sediment rating curves show a trend toward a constant (suspended bed material) sediment concentration at sufficiently high discharges. This maximum value of sediment concentration can properly be referred to as the ultimate sediment concentration. The ultimate sediment concentration is shown to be a function of a dimensionless (bed material) sediment transport parameter and a dimensionless flow parameter (the square of the Froude number). Alternatively, the Froude number squared can be expressed as the ratio of bottom slope and dimensionless Chezy friction factor.

Subject Headings: Bed materials | Suspended sediment | Ratings | Curvature | Water discharge | Fluid flow | Water flow |

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