USER MANUAL SWAN Cycle III version 40.72A

Description of commands 43
| | East | |
| | NE | |
| | | |
BOUNdspec < | [k] | > &
| |
| |
| | -> XY < [x] [y] > | |
| | | |
| SEGMent < | < [i] [j] > | > |
| IJ < > |
| | < [k] > | |
| | PAR [hs] [per] [dir] [dd] |
| CONstant < |
| | FILE ’fname’ [seq] |
< >
| |
| | PAR < [len] [hs] [per] [dir] [dd] > |
|VARiable < |
| | FILE < [len] ’fname’ [seq] > |
This command BOUNDSPEC defines parametric spectra at the boundary. It consists of two
parts, the first part defines the boundary side or segment where the spectra will be given,
the second part defines the spectral parameters of these spectra. Note that in fact only the
incoming wave components of these spectra are used by SWAN. The fact that complete
spectra are calculated at the model boundaries from the spectral parameters should not
be misinterpreted. Only the incoming components are effective in the computation.
There are two ways to define the part of the boundary at which the spectra are imposed.
The first (SIDE) is easiest if the boundary is one full side of the computational grid,
although it should not be used for curvi-linear grids. The second (SEGMENT) can be used
if the boundary segment goes around the corner of the grid, or if the segment is only part
of one side of the grid.
This BOUNDSPEC command can be given a number of times, i.e. to define incident wave
fields on various sides or segments of the boundary. One BOUNDSPEC command can be used
for only one side or one contiguous segment.
SIDE the boundary is one full side of the computational grid (in 1D cases either
of the two ends of the 1D-grid).
SHOULD NOT BE USED IN CASE OF CURVI-LINEAR GRIDS!
NORTH, ... indicates on which side the boundary condition is applied. N means the