' I ' 



wind velocity v = 16 m/sec 



2.5 hours 



5.0 hours 



7.5 hours 



I h ours 



I 5 hours — 



100 200 



Fetch , X , in kilometers 



300 



Fig. 21. V/ave stecpnes, hA , as a fimcticn of x and 



duration (hours) at a wind velocity v = l6 m/sec, 

 corresponding to figure 20. 



wind velocities will be given in a following report.) 



If the duration of wind with v = 16 m/sec exceeds l6.8 hours, 

 and if the fetch is longer than 300 km, the development of co mplex 

 sea will continue, but for the p -wave a "steady state" is attained 

 over any fetch or for any duration. Longer waves develop, but the 

 B -waves remain always present as the first dominating waves, break- 

 ing from time to time, and being continuously regenerated by energy 

 supply from the wind. 



Table 10 (example 3) for v = l6 m/sec shows that the fully de- 

 veloped p(l)-wave would appear already at a fetch of x = 345 km (mini- 

 mum duration t = 18,4 hours). Its dimensions are 



T(l) = 10.2 sec, A(l) = 163 ra; Hd)^^^ = 6.6 m. 

 The growth of this wave up to fully arisen state is given in Table 

 8, 2) for V = 16 m/sec. 



114 



