MIKE 21 BW, User Manual, Page: 62 / 196

Examples
62 MIKE 21 BW - © DHI
Figure 4.36 Visualisation (3D) of instantaneous surface elevation and the surface
rollers. The image (and animation) is made in MIKE Animator Plus.
Upper panel: regular waves, lower panel: directional waves
Time series of surface elevation and corresponding wave spectrum are pre-
sented in Figure 4.37 (regular waves) and Figure 4.38 (irregular waves). The
spectra are calculated by use of the WSWAT Linear Spectral Wave Analysis
Module. However, the FFT tool included in the MIKE 21 Toolbox may also be
used for calculation of raw spectra.
Both figures clearly illustrate the effect of wave breaking and nonlinear wave-
wave interaction (generation of higher harmonic waves).