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Sediment Transport

Sediment Transport. Bed-load transport relations (well sorted sediments). A common approach for quantifying the bed-load transport is to relate the Einstein number with the Shields stress. Popular bed-load transport relations for well sorted sediments Myer-Peter and Muller [1948]

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Sediment Transport

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  1. Sediment Transport

  2. Bed-load transport relations(well sorted sediments) • A common approach for quantifying the bed-load transport is to relate the Einstein number with the Shields stress. • Popular bed-load transport relations for well sorted sediments • Myer-Peter and Muller [1948] • Wong and Parker [2006] • Einstein [1950] • Parker [1979] • Ashida and Michiue [1972] • Engelund and Fredsoe [1976]

  3. Bed-load transport relations(poorly sorted sediments) • The threshold condition for the initiation of motion involving grain size with a wide range of size distribution is controlled by both the weight and exposure of the particle. • The transport rate depends on the availability of a given size fraction in the active layer. • Parker [2007] provides a comprehensive description of various bed-load models of sediment mixture.

  4. Resistance relations • Bed shear stress or boundary resistance may be expressed as: • The non-dimensional bed shear stress is expressed as: • Friction factor for fully rough flow can be estimated by using Keulegan Law [1938] or Manning-Strickler equation. • Shields stress under the uniform or normal flow condition

  5. Resistance relations • A bedform is a feature that develops at the interface of fluid and a moveable bed, the result of bed material being moved by fluid flow. Examples include ripples and dunes on the bed of a river • The most common bedform observed in nature is dune. • Wright-Parker model (Chaudhry, 2008)

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