The Transition Zone 
2 
[KyD(#,9F) | is the spectrum amplification function. It is the square 
of the ordinary Refraction Diagram plotted in the 1,9¢. plane instead 
of in the T,@ plane. (2,32) 
Ae 
Opx=O(p,8F)is the angle that the crest makes with the y axis at Yr, 
Xp Plotted as a function of » and an, ie. the wave frequency and 
the deep water direction with respect to a line perpendicular to the 
coast at the forecast point. (12253) 
g* = @"(u,8,) is the inverse of the functian given above (12.34) 
06% JO"(udp) 
Psd eA aa ct als a 
Gone eee RD (12.35) 
Steps in Wave Refraction 
: 2 Dealia : : 
Step I, Multiply [A.(,6%)| by [Ky D(H, 4F ) graphically to find 
[aoa OP I” [Ku D(H 8]? (12.36) 
Step I, Substitute equation (12.34) for oF to express(12.36) as a function 
of 8 andfind [A,%u,9 (u,4a))|* [KyD(2,97%(1,8a))| (12.37) 
StepII Correct, by multiplication by equation (12.35),for distortion 
to find [Azpy(H,On)]°= [Aoet(H,0 (4,8R))]° [Ku D(#,07(1,9R))] °F (4,8R) (12.38) 
Plate LXV 
