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Boundary conditions

The boundaries of the computational grid in SWASH are either land, beach or water. SWASH provides the following specification of boundary conditions:

When imposing irregular waves at a boundary segment by means of a spectrum it is assumed that the variation of the depth along the boundary segment is slowly.


SWASH has the option to make a computation that is nested in SWAN. In such a run, SWASH interpolates the locations, as specified in the SWAN run with POINTS or CURVE, to the user-defined boundary, either side or segment (see command BOUNDCOND), of the concerning SWASH run. The SWAN spectra are written to those locations using the SWAN command SPECOUT. These wave spectra are employed as boundary conditions using the SPECSWAN command. It is assumed that the wave spectra are stationary. Also, both SWASH and SWAN runs must used the same coordinate system, either Cartesian or spherical.


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The SWASH team 2017-04-06