NumerlcE-l Value 



D 







600 naut. m. (D" = D) 



10 knots 



0.L7 (Hp„ = Hj^) 



8.5 feet 



1.27 {T^„ = Tp) 



11.4 seconds 



10.2 seconds 



0.98 



1.43 /Using (29) and (34i7 



12,2 feet 



Thus, the corrected height of the svell is 12.2 feet. The 

 period is 11.4 seconds, as in the preceding examples, and the 

 travel time, 40 hours. It is prohahle that the method gives v/ave 

 heights that are somewhat too great and periods that are too short, 



Exaiaple 2 (Table V, special case b) 



Wave height at end of fetch, Hj, . . IS feet 

 Wave period at end of fetch, t£, . . 9.0 seconds 

 Distance of decay, D 600 naut. m. 



On the basis of the subsequent v/eather map it is estimated 

 that the sv;ell will meet an opposing wind of 30 knots over the 

 last 200 nautical miles of the distance of decay. Again using 

 t'ne symbols in Table VI: 



4 



o 



