Model for non-steady suspended sediment transport
Abstract
A mathematical model is described for suspended sediment transport which enables morphological computations to investigate the effects of human interference and/or geometrical changes in a river or estuary. The model is partly based on former research on bed-load transport models, and on the two-dimensional sediment diffusion-convection equation. This equation describes the movement of the sediment, in fact the distribution of the concentrations in the two-dimensional flow field, under the influence of diffusion, convection and gravity. The local velocities in the vertical are given by the logarithmic distribution, while for the sediment diffusion coefficient a newly derived parabolic/constant expression is applied. The diffusion equation is solved by an implicit numerical method, making use of a favorable transformation. The method is restricted to non-cohesive and nearly uniform sediment material. A test computation concerning the sedimentation in a trench was executed to verify the applicability of the mathematical model.
- Publication:
-
Presented at the 17th Congr. of the Intern. Assoc. for Hydraulic Res
- Pub Date:
- November 1977
- Bibcode:
- 1977iahr.congR..15K
- Keywords:
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- Mathematical Models;
- Sediment Transport;
- Solid Suspensions;
- Convection;
- Diffusion;
- Logarithms;
- Two Dimensional Flow;
- Unsteady State;
- Velocity Distribution;
- Fluid Mechanics and Heat Transfer