cornered power spectrum. Example one is given so that it can be 
compared with the next example in order to show how remarkably 
different the forecast results can be. 
Example two is somewhat more realistic, although it must be 
emphasized again that very little is known about the actual values 
of Ej(#,©) in nature. In example two, E,(#,0) is zero for © 
between -1r/2 and -37r/8. It is given by equation (9.51) between 
-37/8 and 37/8. For © between 3r/8 and 7/2, it is a function of 
/ alone. 
The second mixed partial derivative is different from zero 
only for © between -37/8 and 37/8. [ay (pw ,0)]° is then given by 
equation (9.52). 
E,(# ,©) and [a,( #,0)]° are shown in figures 21 and 22, 
respectively. The isopleths of constant Eo(# ©) for 8 greater 
than 37/8 follow the circles of the coordinate system since there 
is no variation in ©. The power spectrum has a peak at 6 = O and 
B= 2n/T,° The values of the parameters in the equations for 
the evaluation are given by 
K = 2.68 10? em*sec*, 
and Ty = 10 seconds. is then given by 2.5 10? em>. The 
Eo max 
average potential energy in the system is then equal to 625 107 
erg/cn@ (if the product pg equals 103 g,/em-sec°). This is the 
Same amount of potential energy averaged over y and t which would 
be found in a simple sinusoidal wave with an amplitude (crest to 
mean water level) of five meters. The same amount of energy as 
in the power spectrum given in example one has been used for 
purposes of comparison later. 
=) 2255= 
