Model for Suspended Sediment Transport

by Peter M.J. Kerssens, Project Engr.; Delft Hydr. Lab, Delft, The Netherlands,
Leo C. van Rijn, Project Engr.; Delft Hydr. Lab., Delft, The Netherlands,
Adry Prins, Sr. Scientific Officer; Delft. Univ. of Tech., Delft, The Netherlands,

Serial Information: Journal of the Hydraulics Division, 1979, Vol. 105, Issue 5, Pg. 461-476

Document Type: Journal Paper


A mathematical model for suspended sediment transport is described, which enables the investigation of certain effects of river works or geometrical changes, or both, in a river or estuary by morphological computations. The model is based on the two-dimensional diffusion-convection equation. This equation describes the distribution of the sediment concentrations in a two-dimensional flow field by diffusion and convection. For the local velocities in the vertical the logarithmic distribution is used, while for the sediment diffusion coefficient a new expression is applied. The diffusion-convection equation is solved by an implicit numerical method using a coordinate transformation, while the influence of the diffusion coefficient on the adaptation of the transport in the case of an overcapacity of sediment is presented. A dimensionless graph of the adaptation length of a uniform concentration vertical is given, the application of the model for tidal flow is described and for such conditions a prototype verification and a sensitivity analysis is given. The model is limited to situations with relatively small changes in lateral direction and nongraded bed.

Subject Headings: Suspended sediment | Sediment transport | Mathematical models | Diffusion | Sensitivity analysis | Hydrologic models | Two-dimensional models | Advection

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