Reference Manual
148 MIKE 21 BW - © DHI
Figure 5.35 Typical reflection coefficient ranges for short period waves (T<20s).
From Thompson et al (1996)
Transmission through Structures
Transmission through porous structures are modelled by applying porosity
values at grid points representing the structures.
To determine the porosity values and the number of porosity layers to repre-
sent a given transmission coefficient the MIKE21 Toolbox tool Calculation of
Reflection Coefficients should be used.
5.3.11 Sponge layers
Sponge (or absorbing) layers can be used as efficient numerical wave
absorbers in Boussinesq wave simulations. These may e.g. be set up along
model boundaries to provide radiation boundary conditions, which absorb
wave energy propagating out of the model area.
2DH Boussinesq wave module
In the figure below sponge layers are used to model a fully absorbing beach
and to absorb waves radiating out of the harbour area.
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