0.01 



0.05 

 0.1 

 0.2 



0.5 

 1 

 2 



10 



S 20 



.■f 30 



I 40 



f 50 



I 60 



>■ 70 



99 

 99.5 



99.8 

 99.9 































/ 



/ 







s 































// 











Station 1 

 X Observations of Significant Wave Height — 

 (From U.S. Weather Bureau Data 1947-53) 

 (Data Truncated at 2 l /i Feet) 













a 























V 











a 









vJ 



/ 















Station J 











»*'' 



























^y 



• Observations of Significant Wave Height 

 (From U.S. Weather Bureau Data 1947-53) 































































Stations I and J 



Measurements of Maximum Wave Height 

 obtained by Darbyshire (Reference 9) ' 

 during period Feb 1953 - Jan 1954 

 (Data Truncated at 5 feet) 























S 







































































































A 



i 



































































































































































































































Note: The Straight lines are the log- 

 normal cumulative distributions 

 computed directly from the ex- 

 perimental data. 

































/ 































































t 













































































7 8 9 10 20 



Wave Height, feet 



40 50 50 70 80 90 



Figure 8 - Comparison of Wave Height Distributions Derived from Visual Observations 

 and from Measurements of Wave Heights at Atlantic Ocean Stations I and J 



The distribution fitted to the Darbyshire data corresponds to a standard deviation of 0.57 for log (maxi- 

 mum wave height) and a median value of the maximum wave height equal to 15 feet. 



12 



