B = 1L 



V, 



10 



I 2 



10 



12 W 16 18 20 



= 15° 



B=IL 



10 



1 2 



10 12 14 



16 18 20 



(Johnson, 1952) 



Figure 2-55. Diffraction for a breakwater gap of one wave- 

 length width where ij) = 0° and 15°. 



2-101 



