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  • Wave-driven currents and sediment transport patterns

    SWAN-PISCES coupling
  • SWAN-PISCES coupling
  • SWAN-PISCES coupling
  • SWAN-PISCES coupling
  • SWAN-PISCES coupling

SWAN-PISCES coupling

Our goal in this project was to implement a FORTRAN-based tool allowing automated transfer of information between SWAN to PISCES models.

The simulations of wave-driven currents and subsequent computation of sediment transport patterns and morphodynamics using the PISCES models (TELEMAC2D, TOMAWAC and SANDFLOW) is generally based on the TOMAWAC wave model. This is included in the TELEMAC system (EDF-LNH, France).

Recently the SWAN wave model (Delft University of Technology, the Netherlands) is used increasingly for wave-driven current modelling. The benefits of SWAN over TOMAWAC are that:

In its infancy, the coupling of SWAN to PISCES involved manual interpolation of wave force fields onto the TELEMAC mesh. However, manual transfer between the TELEMAC based models and SWAN is not practical where there has to be frequent updating of the wave fields to serve as input to the TELEMAC flow model and SANDFLOW sediment transport model (in the case of morphodynamic simulations) with back-coupling of the evolved bathymetry, water level and current fields to the SWAN model.

Our goal in this project was, therefore, to implement a FORTRAN-based tool allowing automated transfer of information between these models.

A new tool

The resulting tool telemac2swan allows for two-way data transfer between the models. This includes:

Transfer can be done directly (in the case of identical node locations in the PISCES mesh and SWAN grid) or (in other cases) through inter- and extrapolation. When using SWAN in unstructured mode (available from version 40.72), a TRIANGLE-type mesh and bathymetry for SWAN can be generated based on the PISCES mesh. Telemac2swan is executed from the command line and can therefore be incorporated into DOS- scripts for automatic execution of sequenced simulations.

Example of SWAN wave heights and forces and subsequently computed wave-driven currents from TELEMAC2D for the case of a nearshore detached breakwater on a plane sloping beach. Telemac2swan was used to transfer the wave fields from the SWAN output to TELEMAC-format input for the flow model.

Authors

Jort Wilkens, Tim Chesher

Keywords

Telemac2D, SWAN; PISCES, Data transfer

Completed

2007

References

Wilkens, J, and Chesher, TJ 2008. SWAN – PISCES Coupling, A Tool for Transfer of Data between TELEMAC2D and SWAN. Report IT 568, Release 1.0, September 2008.

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"The resulting tool of this research. telemac2swan, allows for two-way data transfer between the models"

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