Author(s): R. S. Govindaraju; P. L. Shrestha; L. C. Roig
Linked Author(s):
Keywords: No Keywords
Abstract: A simplified theory for the continuous evolution of soft sediment beds is presented. The entire bed is represented as a continuum, with continuous variation of properties such as density, shear strength and porosity. This model takes into account the dynamic processes of erosion and deposition occurring at the top of the bed. These are influenced by the shear forces exerted by the flow field. The time dependent consolidation of the bed is also accounted for at each time step. The deposition of soft sediments and their subsequent consolidation involves large changes in density, hence consolidation theory for large strains is adopted. Particular forms of the constitutive relationships between permeability-void ratio-effective shear stress are used to render the governing equations linear. Simulation results show that this approach provides a viable method for representing the bed-evolution in cohesive sediment transport models.
Year: 1997