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Segregation of Sediment During Deposition

by J. Y. Lu, USDA, USDA,
W. H. Neibling, USDA, USDA,
G. R. Foster, USDA, USDA,
M. J. Khan, USDA, USDA,
S. J. McAfee, USDA, USDA,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

A laboratory experiment was conducted to investigate the segregation of sediment during deposition. Sediment eroded from an upslope source area of Blount silt loam was introduced to a concave bed and exposed to different rainfall rates. In general, for a given particle class, the percentage of aggregates increased in the flow direction within the deposition area. Since the density of aggregates was usually lower than the density of primary particle of the same size, the results clearly showed segregation of sediment particles by density during deposition. The median particle sizes of the deposited sediment, in general, decreased in the flow direction for the 90-min subruns with final bed profiles approaching an equilibrium condition. However, the diameter-density interaction seemed to be present even for the 90 min subruns.

Subject Headings: Sediment | Particle size distribution | Bed materials | Rainfall | Aggregates | Water flow | Silt

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