3URE 6-8. COMPARISON OF AN OBSERVED WAVE SPECTRUM TO EMPIRICAL SPECTRA OF 

 PIERSON-MOSKOWITZ. (PM). 



.05 

 2.6 



.10 



T 



FREQUENCY, f , Hz 



.15 .20 .25 



1 1 r 



-PM SPECTRUM 

 v= 14 m/s 

 fMAX. =0.10Hz 



OBSERVED SPECTRUM 

 0902Z 17 JULY 1970 

 V (FETCH)~13-13.5 m/s 



.30 



PM SPECTRUM 

 V = 1 3 m/s 



MAX. 



= 0.105 Hz 



PM SPECTRUM 

 v = 12 m/s 



0.11 Hz 



.27r .37r .477 .5ir 



a>(RADIANS PER SECOND) 



67 



