Numerical Modeling of Suspended Sediment Transport

by C. Teisson, Electricite de France, France,
D. Fritsch, Electricite de France, France,

Abstract: Validity domain of hypothesis of depth integration has been approached by comparison of results of depth integrated model with complete vertical models. Use of shape functions to represent vertical profile of sediments from the depth average concentration is not recommended when strong variation of velocities in space or time occurs. For complex situation, or in case of coarser sediment, a quasi 3D model will be used, based on horizontal convection of a vertical profile instead of vertically averaged concentration. Main problem of vertical models is to define the interface at the bottom between the solid and liquid phases. Use of the concept of 'false bed' may lead to misleading in case of coarse sediment. Sediment transport requires a precise knowledge of the flow (eddy representation in harbours) and pleades for higher accuracy in hydrodynamic modeling (κ-ɜ model). Mud sliding on the bottom, due to its very mild equilibrium slope, should also been modeled.

Subject Headings: Mathematical models | Three-dimensional models | Hydrologic models | Sediment transport | Model accuracy | Case studies | Hydrodynamics

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