MIKE 21 BW, User Manual, Page: 11 / 196

General Description
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The 2DH module (two horizontal space co-ordinates) solves the enhanced
Boussinesq equations by an implicit finite difference technique with variables
defined on a space-staggered rectangular grid.
The 1DH module (one horizontal space co-ordinates) solves the enhanced
Boussinesq equations by a standard Galerkin finite element method with
mixed interpolation for variables defined on an unstructured (or a structured)
grid. Surf zone dynamics and swash zone oscillations can be simulated for
any coastal profile in this module.
Figure 2.3 The MIKE 21 BW includes two modules. The 2DH module (left panel) is
traditionally applied for calculation of wave disturbance in ports and har-
bours. The 1DH module (right panel) is selected for calculation of wave
transformation from offshore to the beach for the study of surf zone and
swash zone dynamics
MIKE 21 BW also includes porosity for the simulation of partial reflection from
and transmission through piers and breakwaters. Sponge layers are applied
when full absorption of wave energy is required. Finally, MIKE 21 BW also
includes internal generation of waves.
2.1.1 Application Areas
A major application area of MIKE 21 BW is determination and assessment of
wave dynamics in ports and harbours and in coastal areas. The disturbance
inside harbour basins is one of the most important factors when engineers
are to select construction sites and determine the optimum harbour layout in
relation to predefined criteria for acceptable wave disturbance, ship move-
ments, mooring arrangements and handling down-time.
With inclusion of wave breaking and moving shoreline MIKE 21 BW is also an
efficient tool for the study of many complicated coastal phenomena, e.g.
wave induced-current patterns in areas with complex structures.
2DH Boussinesq wave module
Applications related to the 2DH module include:

determination of wave disturbance caused by wind-waves and swell