Ocean Wave Spectra and Shtp Appltcattons 
where 
s(Eqa Hyon ber fo Bx0(0) Sol wit Hy js) de 
0 
P(X <a) is simply enclosed by the two coordinate axes and the curve 
of 
a) 
I 
g(T,,H, /,) = / Hx p(w) Sp (o;T),H, ;,)de =a 
0 
The use of this diagram will be illustrated below. 
North Atlantic hindcast wave data which contains spectra hind- 
cast at 519 points in the North Atlantic every six hours for a period 
of one year, was selected to study the two-parameter spectral model. 
Spectra at 16 grid points were selected for this study. A total of 
16 x 365 x 4 = 23,360 spectra were analyzed. T,; and Hy, were 
calculated for each spectrum by the use of the following formulas, 
which have been proposed by the ITTcE] 
1335 
