MIKE 21 BW, User Manual, Page: 10 / 196

Introduction
10 MIKE 21 BW - © DHI
MIKE 21 BW is capable of reproducing the combined effects of all important
wave phenomena of interest in port, harbour and coastal engineering. These
include:

Shoaling

Refraction

Diffraction

Wave breaking

Bottom friction

Moving shoreline

Partial reflection and transmission

Non-linear wave-wave interaction

Frequency spreading

Directional spreading
Phenomena, such as wave grouping, surf beats, generation of bound sub-
harmonics and super-harmonics and near-resonant triad interactions, can
also be modelled using MIKE 21 BW. Thus, details like the generation and
release of low-frequency oscillations due to primary wave transformation are
well described in the model. This is of significant importance for harbour reso-
nance, seiching and coastal processes.
Figure 2.2 Simulation of wave propagation and agitation in a harbour area for an
extreme wave event. The breaking waves (surface rollers) are shown in
white
The present release of MIKE 21 BW includes two modules:

2DH Boussinesq Wave Module

1DH Boussinesq Wave Module