The Transition Zone 
In Deep Water near X=Xyp > Y=Yp 
2 * ; a 
[= Cos E & cos 6, ale Yo sin a, | a us| (12.23) 
In Transition Zone, near Xx=XR, y=yp 
n=Agy COS E ae HH) [Xr cos 8, + yr sin Or} — Hot +8] (12.24) 
where Ary =KxyD A (2°29) 
Problem; to generalize above to a short crested Gaussian 
Sea Surface 
Definitions of Terms 
[a,(4,8)]” is the power spectrum at the edge of the fetch (12.26) 
[Ane (H4,8e)) is the forecasted pOwer spectrum at the point offshore 
from point of forecast given by x,,y,. (12.27) 
6-=@-@), from equation (9.61) (12.28) 
[Ave # (1,9) is the forecasted power spectrum at the point Xp 
rotated to line it up with the refraction diagram (12.29) 
OF = 6--B where B is the angle between the continuation of 
R through 8B and the iine drawn out to sea perpendicular to 
the coast through the point (xp, ye) (l2.30) 
2 
[Azan (Hr Oa) is the forecasted power spectrum in the Refraction 
Zone at the point xg,yp and at the depth, H (2.31) 
2 
Problem; To find [Aran Hs OR) from refraction diagram data 
and the forecasted power spectrum. 
Plate LX1V 
