20 



o 



UJ 



</) 



I 



CM 



>- 



z 



UJ 



I- 

 z 



< 

 a: 



\- 

 o 



UJ 

 Q. 



to 



10 



F„ = f 



-5.70 



F_ = f 



4.95 



+ = Fg DOWNWIND 

 o = Fg UPWIND 

 • = F„ UPWIND 



J \ L_i 



.10 .15 .20 



TRUE FREQUENCY (CPS) 



u 



1.0 



FIGURE 19, LOG-LOG PLOT OF F^ AND F„ VERSUS WAVE FREQUENCY. 



49 



