Hasselmann and Sohieler 



"1/3 

 [m] 



9- 



8- 



7- 



6- 



5- 



3- 



2- 



o /&4« A a 



ot>, •tM ■ 



P-BAND a 



L-BAND A 



C-BAND o 



X-BAND 



OPEN POINTS (VERTICAL) 



CLOSED POINTS (HORIZONTAL) 



hp.b [m/s] 



Fig, 5, Comparison of theoretical half-power bandwidths (h.p.b.) 

 for zero'thorder Gaussian spectrum with measurements by 

 Valenzuela and Lang 20 . Doppler frequencies are in 

 units of equivalent velocities U<j = wj/Zk . Theoretically, 

 a Pierson-Moskowitz spectrum with cos^ \\i spreading 

 function yields 



h.p.b, [m/s] = 1,06J.^^-^ (4cos% + i)+sin^ej'^ {H,^[m])'^^ 



where the significant wave height H,/3» A{^f^= 0.209 U^g- 

 The computations were made for ijj = 0°, 9 = 20°, 



376 



