MIKE 21 BW, User Manual, Page: 29 / 196

2DH Boussinesq Wave Module - Examples
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Figure 4.3 Model layout. The 10 point wide areas indicate sponge layers and the
line at k=0 the open essential boundary. The thickness of the sponge
layer is about one times the wave length
At the open south boundary a flux boundary is applied. Sinusoidal waves with
a wave period of 8 s and wave height of 1m is generated. According to linear
theory the wave length is approximately 100 m. Thus, the simulation requires
the so-called “deep-water terms” to be included, i.e. it is the enhanced Bouss-
inesq type equations which have to be solved in this case.
The grid spacing is chosen to be 10 m representing the waves with approxi-
mately 10 points per wave length. The time step is chosen to be 0.25 s repre-
senting the waves with 32 points per wave period.
The simulation period is chosen to be 200 s corresponding to 800 time steps.
Model results
The model results are presented in Figure 4.4 showing a contour plot of the
instantaneous surface elevation and a map showing the isolines of the wave
disturbance coefficient in the entire domain.