Coiaparlson of Measured and Computed Values 



Theory indicated that velocity, length, and period for deep- 

 water waves are interrelated by the formulae 



C = L /g L ^ X, L=i^c2r4-T2; T =1^ L -- ^ i 

 1 1^ 2Tr 277' g 277 '/t/g g 



With C_ in knots, L in feet, and T in seconds: 



C = 1.34 /r- 3.03 T 

 L = 0.555 (?- 5.12 1^ 

 T = 0.422/Lr= 0.33 C 



Thus , if one characteristic is measured the other two can be com- 

 puted, and if two or three are measured the correctness of the 

 theory as applied to ocean waves can be checked. Comparisons of 

 measured and computed values have given satisfactory results, in- 

 dicating that wind waves and swell in deep water do have the char- 

 acteristics described above. In general, the conclusion that the 

 ratio H/L always remains less than 1/7 is also confirmed by obser- 

 vations, as waves of this or greater steepness are very rarely 

 reported. 



Empirical Relationships between Wind and Waves 



Observations of waves have not led to clear-cut conclusions 

 about the empirical relationships between the wind and waves. The 

 following nine approximate relationships have been proposed by 

 various workers: 



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