= 30 



B = IL 



V, 



10 



I 2 



8 10 12 14 16 18 20 



y/, 



0^45 



B=IL 



8 10 12 



y/i 



14 16 18 20 



(Johnson , 1952) 



Figure 2-56. Diffraction for a breakwater gap of one wave- 

 length width where (j) = 30 and 45 . 



2-102 



