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2D Sediment Transport

The 2D Sediment Transport model (SED2D) is extended from a one dimensional multi-layered bed load transport model (SEDROUT5). SEDROUT is based on advanced forms of sediment conservation equation for non-uniform sediment mixtures that account for the vertical structure of river beds. The following features are included in SED2D:

  • As SEDROUT was originally developed for gravel-bed rivers, additional sediment transport rate equations (applicable for sandy mixtures of the St-Lawrence River and its tributaries) are made available in the extended model;
  • To account for the deviation of the bed shear direction from the two dimensional depth averaged velocity direction, helical flow and bed slope effects on the bed shear stress direction are included as corrections in the fractional bed load transport rate; and,
  • A diffusion term was included in the sediment continuity equation for bed level and for the size fractions:
    • to be compatible with the H2D2 formulation, the numerical techniques that are used to solve the system of equations; and,
    • to damp possible bed level and size fraction oscillations.

SED2D is coupled with SV2D (hydrodynamic module of H2D2) using the sequence algorithm of H2D2 that is dedicated to run a sequence of simulations one after the other. Depending on the problem, the Sediment Transport module and the hydrodynamic module can be run either separately or can be combined in a sequence (at each global time step, the hydrodynamic variables are transferred to SED2D and the new bathymetry is transferred back to SV2D), with each module having its own resolution strategy and its own time step.

This section on the element for the 2D Sediment Transport simulation is divided as follows:

Chapitre: sediment transport ( 1 / 15 )

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