28 



THEORY OF SEAKEEPING 



Fig. 2 1 Wave height and velocity as functions of duration, using nondimensional parameters and relation 

 between minimum duration, fetch, and wind velocity. Theoretical relationships shown by curves; ob- 

 servations by symbols (from Sverdrup and Munk, 1947) 



0|3 



1,4 

 1.2 

 1.0 



1.8 

 0.6 

 0.4 



0.2 







10" 



o M.S.'Heidberg" (1950-51) 



+ Gibson 



• von Sverdrup- Munk zusammengestellt 



a Cornish 



-6- Sfanlon 



L Cornish 



B Woods Hole 



J I 



2 3 4 6 8 10° 2 3 4 G 6 10' 



2 3 4 SB 10^ 1 3 4 G 8 10= 2 3 4 G 8 10* 2 3 4 6 810= 

 gx 



Fig. 22 Wave celerity c of characteristic waves in complex seas as function of fetch .v and wind velocity V in 

 nondimensional presentation (from Neumann, 19526) 



accompanied hy exten.sive descriptions of the pliysical nificant wave or of a composite of tliree distinct waves is 



sea. certainly obsolete. In spite of this, the results of this 



However a development based on the idea of a sig- development are currently u.'Jcd in the wave-forecasting 



