MIKE 21 BW, User Manual, Page: 12 / 196

Introduction
12 MIKE 21 BW - © DHI

analysis of low-frequency oscillations
(seiching and harbour resonance) caused by forcing of e.g. short-wave
induced long waves

wave transformation in coastal areas where reflection and/or diffraction
are important phenomena

Surf zone calculations including wave-induced circulation and run-
up/run-down

simulation of propagation and transformation of transients such as ship-
generated waves and tsunamis
Assessment of low-frequency motions in existing as well as new harbours is
often performed using a combination of simulations with synthetic white-noise
spectra and simulations with natural wave conditions. The purpose of the for-
mer type of simulations is to investigate the potential of seiching/resonance
and identification of natural frequencies. This is particularly useful for relative
comparisons between different layouts.
MIKE 21 BW is also applied for prediction and analysis of the impact of ship-
generated waves (also denoted as wake wash). Essential boundary condi-
tions (at open or internal boundaries) for the models can be obtained from 3D
computational fluid dynamic (CFD) models, experimental data, full-scale data
and/or empirical relationships.