H„ = H 



1 1 L 



2 n L' 



(68) 



in which n is 



2kh 



sinh(2kh) 



(69) 



and H' and L' are the wave height and wavelength, respectively, in the 

 horizontal section of the tank (h = 1.25 ft), and k = 2tt/ l is the wave 

 number. The wavelength at a depth h can be calculated by linear wave theory 

 as : 



L = L_ tanh(kh) 



(70) 



The observed maximum wave heights and resulting deepwater wave steepnesses are 

 tabulated in Table 4. Maximum H /L is plotted versus period in Figure 24. 

 A range of wave conditions based on deepwater wave steepness was selected from 

 Figure 24 and is listed in Table 5. 



Table 4 

 Maximum Wave Height Observed in the 18 -In. Tank 





h 

 ft 



T 

 sec 



0.7 



"max 



ft 



Lo 

 ft 



H 



ft 



H /Lo 



1.25 



0.21 



2.51 



0.21 



0.0844 



1.25 



1.0 



0.46 



5.12 



0.49 



0.0965 



1.25 



2.0 



0.58 



20.50 



0.59 



0.0286 



1.25 



3.0 



0.92 



46.12 



0.80 



0.0174 



1.25 



4.0 



0.67 



82.00 



0.51 



0.0063 



1.25 



5.0 



0.42 



128.12 



0.29 



0.0023 



1.25 



6.0 



0.29 



184.49 



0.18 



0.0010 



1.25 



7.0 



0.25 



251.11 



0.15 



0.0006 



63 



