ssc-367 - Ship Structure Committee

The equation for the Weibulldistribution is as follows.
P(H) = 1 - EXP[ -( (H-E)/e )= ]
where
P(H)
is the cumulative probability,
H
is the extreme height,
E
is the location parameter that locates one end of
the density function,
e
is the scale parameter, and
a
is the shape parameter.
By plotting the wave exceedance data on Weibull graph paper, the
distribution can be fit with a straight line and the extreme value
for any cumulative probability can be found by extrapolation.
A.9
WIND ENVIRONMENT
The wind environment, source of most ocean waves, is random in
nature. The wind speed, its profile and its directionality are
therefore best described by probabilistic methods.
A.9.1
Air Turbulence, Surface Roughness and Wind Profile
Air turbulence and wind speed characteristics are primarily
influenced by the stability of the air layer and terrain. For
extreme wind gusts the influence of stability is small, making
A-23