USER MANUAL SWAN Cycle III version 40.72A

42 Chapter 4
| |
| BIN |
| -> POWer |
DSPR < >
| DEGRees |
This command BOUND SHAPESPEC defines the shape of the spectra (both in frequency and
direction) at the boundary of the computational grid in case of parametric spectral input
(see command BOUNDSPEC).
JONSWAP
[gamma]
PM
GAUSS
BIN
[sigfr]
PEAK
MEAN
DSPR
POWER
DEGREES
JONSWAP spectrum will be used. This is default.
peak enhancement parameter of the JONSWAP spectrum.
Default: [gamma]=3.3.
Pierson-Moskowitz spectrum will be used.
a Gaussian-shaped frequency spectrum will be used.
energy is located in one frequency bin (the frequency bin closest to the [per]
value of command BOUNDSPEC).
width of the Gaussian frequency spectrum expressed as a standard deviation in Hz.
Default: the peak period (for definition, see Appendix A) is used as characteristic
wave period. This is default.
T m01 (for definition, see Appendix A) is used as the characteristic wave period.
option for expressing the width of the directional distribution (the distribution
function itself is cos m (θ − θ peak ).
the directional width is expressed with the power m itself, this option is default
(note that the directional resolution should accommodate the directional width,
see command CGRID).
the directional width is expressed in terms of the directional standard deviation
of the cos m (θ − θ peak ) distribution (for definition, see Appendix A).
(Note that the directional resolution should accommodate the directional width,
see command CGRID).
If this command is not used, the JONSWAP option will be used by SWAN with [gamma]=3.3
and POWER for the directional width.
| North |
| NW |
| West |
| SW | | -> CCW |
| -> SIDE < South > < > |
| | SE | | CLOCKWise | |