USER MANUAL SWAN Cycle III version 40.72A

80 Chapter 4
FORCE wave-induced force per unit surface area (vector; in N/m 2 ).
UBOT the rms-value of the maxima of the orbital velocity near the bottom (in m/s).
Output only if command FRICTION is used. If one wants to output UBOT but
friction is ignored in the computation, then one should use the command
FRICTION with the value of the friction set to zero (FRICTION COLLINS 0).
URMS the rms-value of the of the orbital velocity near the bottom (in m/s).
If one wants to output URMS but friction is ignored in the computation,
then one should use the command FRICTION with the value of the friction
set to zero (FRICTION COLLINS 0).
TMBOT the bottom wave period (in s).
WLEN average wavelength (in m).
STEEPNESS average wave steepness (dimensionless).
BFI Benjamin-Feir index (dimensionless).
DHSIGN the difference in significant wave height as computed in the last two iterations.
This is not the difference between the computed values and the final limit of
the iteration process, at most an indication of this difference.
DRTM01 the difference in average wave period (RTM01) as computed in the last two
iterations. This is not the difference between the computed values and the
final limit of the iteration process, at most an indication of this difference.
LEAK numerical loss of energy equal to c θ E(ω,θ) across boundaries
θ 1 = [dir1] and θ 2 = [dir2] of a directional sector (see
command CGRID).
TIME Full date-time string as part of line used in TABLE only. Useful only in case of
nonstationary computations.
TSEC Time in seconds with respect to a reference time (see command QUANTITY).
Useful only in case of nonstationary computations.
XP user instructs SWAN to write the x−coordinate in the problem coordinate system
of the output location.
YP user instructs SWAN to write the y−coordinate in the problem coordinate system
of the output location.
DIST if output has been requested along a curve (see command CURVE) then the distance
along the curve can be obtained with the command TABLE. DIST is the distance
along the curve measured from the first point on the curve to the output location
on the curve in meters (also in the case of spherical coordinates).
SETUP Set-up due to waves (in m).
[unit] this controls the scaling of output. The program divides computed values by [unit]
before writing to file, so the user should multiply the written value by [unit] to
obtain the proper value.
Default: if HEADER is selected, value is written as a 5 position integer.
SWAN takes [unit] such that the largest number occurring in the block
can be printed.
If NOHEADER is selected, values are printed in floating-point format, [unit] = 1.
OUTPUT the user requests output at various times. If the user does not use this option, the