1.0 



0.8 



' 0.6 



0.4 



0.2 



L = 40ft 

















/ 



L = 70 ft 





L=l00ft 







"^L = l25ft 



ft 



















\ / 















L= 150ft 





















20 40 60 80 100 120 140 



Applied hp per foot of Breakwater 



160 180 



Figure 145. Effect of applied horsepower per foot and wavelength, L, on 

 effectiveness of pneumatic breakwater at a 40-foot water depth 

 (after Straub, Bowers, and Tarapore, 1959). 



220 



100 



200 fps 

 Breakwater Length = 20 ft 



1.0 2.0 3.0 4.0 



Diameter of Supply Pipe in feet 



50 



Figure 146. 



Effect of supply pipeline diameter, length of supply pipeline, 

 and supply pipeline velocity on total horsepower requirements of 

 pneumatic breakwater, extrapolated from small-scale laboratory 

 data (after Straub, Bowers, and Tarapore, 1959). 



206 



