MIKE 21 BW, Руководство пользователя, Страница: 161 / 196

Output Parameters
161
line is included. The wave set-down and wave setup can be calculated from
this item.
Mean flux, P
The mean flux P is defined as time averaged depth-integrated flux density in
x-direction
Mean flux, Q
The mean flux Q is defined as time averaged depth-integrated flux density in
y-direction.
Mean velocity, u
0
The mean velocity u
0
is defined as time mean of the depth-averaged velocity
in x-direction. You should include this parameter in your output when studying
wave-induced circulation.
Mean velocity, v
0
The mean velocity v
0
is defined as time mean of the depth-averaged velocity
in y-direction. You should include this parameter in your output when studying
wave-induced circulation.
Mean roller thickness
The mean roller thickness can be interpreted as a time-averaged measure of
the intensity of wave breaking. Outside the surf zone the mean roller thick-
ness is zero. The definition of the roller thickness is given in Sørensen et al
(2004), which is included in the Scientific Documentation.
Skewness
The skewness S (no unit) is defined by
(5.11)
where E denotes the mean operator. Thus, the skewness may be examined
as the mean cube of the time series of the surface elevation normalised by
the mean square of the time series of surface elevation to the power 3/2. The
skewness is a higher-order integral measure of the lack of horizontal wave
profile symmetry. For further information on this output type please see
Kofoed-Hansen and Rasmussen (1998) p. 213ff. Usually you will not include
this item in your model output specifications.
Kurtosis
The kurtosis K is defined by
(5.12)
S
E

3
 
E

2
 
3/2
-------------------- =
K
E

4

4
–
 
E

2
 2
–
  2
----------------------------- 3 – =