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Bed Topography and Sorting in Alluvial Channel Bends

by Yifan Zheng, Univ of Minnesota, United States,
Charles C. S. Song, Univ of Minnesota, United States,



Document Type: Proceeding Paper

Part of: Sediment Transport Modeling

Abstract:

A quasi-three-dimensional model has been developed for the purpose of calculating the velocity distribution, the bed topography and sediment sorting along channel bends. The depth-averaged equations of continuity and motion are solved first by the fractional step method. Next, the local secondary flow is calculated by solving the nonhomogeneous biharmonic equation of stream formation for the two-dimensional flow on a number of cross-sections. Finally, the two-dimensional bed material continuity equation is solved for various sediment size fractions to obtain bed topography and sediment size distribution. The computational results are compared with K.W. Olesen's experimental data.

Subject Headings: Bed materials | Alluvial channels | Velocity distribution | Channel bends | Topography | Two-dimensional flow | Three-dimensional models

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