12 4 6 8 10 12 14 16 18 20 



y/L 



6r- 



0r75°^ 



B=IL 



V, 



L 6 



10 



12 



I 2 



8 10 12 



y/i 



W Ifi 18 20 



( Johnson, 1952) 



Figure 2-57. Diffraction for a breakwater gap of one wave- 

 length width where <j) = 60° and 75°. 



2-103 



