MIKE 21 BW, User Manual, Page: 81 / 196

2DH Boussinesq Wave Module - Examples
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Figure 4.51 Model bathymetry for the detached breakwater example
In the numerical simulations, the physical wave maker is replaced by an inter-
nal line of generation, and re-reflection from the boundary is avoided by using
a 50 points wide sponge layer offshore from the generation line, see
Figure 4.52. The absorbing beach on the offshore side of the detached break-
water is modelled using a sponge layer. The thickness of the sponge layer is
corresponding to one wave length or more. Only in case of directional waves
a sponge layer is used along the lateral boundaries.
A lowpass filter is included to remove high-frequency waves generated during
uprush and downrush at the shoreline and to dissipate the wave energy in