Frequency 



Frequency of Spectral Peak 



Figure 118. Comparison of normalized wave spectra for JONSWAP spectra, 

 Pierson-Moskowitz spectra, and modified spectra represent- 

 ative of that observed in nature (after Jones, 1978). 













Tether Length (ft) 







8 



13 



18 



25 



33 







a 20 



- 



1 



1 





l 



I 



cm 



X. 















% 40 



3 



- 













C 

 cd 















H 















E 6 o 















in 















4-i 

 O 















c 

 o 



s 80 















3 















a: 















inn 





1 



1 1 



1 1 



4 

 1 1 1 1 1 



1 1 1 1 1 



40 

 of Rows 



Figure 119. 



Predicted performance of tethered-f loat breakwater with 

 low density, 5-f oot-diameter spherical floats which pro- 

 vide 50-percent wave height reduction of the modified 

 Pierson-Moskowitz spectrum (after Jones, 1978). 



173 



