CONTENTS 



FIGURES — Continued 



Page 

 2-23 Refraction along a straight beach with parallel bottom contours 2-73 



2-24 Refraction by a submarine ridge (a) and submarine canyon (b) 2-73 



2-25 Refraction along an irregular shoreline 2-73 



2-26 Wave incident on a breakwater — (a) no diffraction and (b) diffrac- 

 tion effects 2-76 



2-27 Wave diffraction at Channel Islands Harbor breakwater, California. . .2-77 



2-28 Wave diffraction diagram — 15° wave angle 2-78 



2-29 Wave diffraction diagram — 30° wave angle 2-79 



2-30 Wave diffraction diagram — 45° wave angle 2-80 



2-31 Wave diffraction diagram — 60° wave angle 2-81 



2-32 Wave diffraction diagram — 75° wave angle 2-82 



2-33 Wave diffraction diagram — 90° wave angle 2-83 



2-34 Wave diffraction diagram — 105° wave angle 2-84 



2-35 Wave diffraction diagram — 120° wave angle 2-85 



2-36 Wave diffraction diagram — 135° wave angle 2-86 



2-37 Wave diffraction diagram — 150° wave angle 2-87 



2-38 Wave diffraction diagram — 165° wave angle 2-88 



2-39 Wave diffraction diagram — 180° wave angle 2-89 



2-40 Diffraction for a single breakwater normal incidence 2-91 



2-41 Schematic representation of wave diffraction overlay 2-92 



2-42 Generalized diffraction diagram for a breakwater gap width of 2 



wavelengths 2-93 



2-43 Contours of equal diffranction coefficient gap width =0.5 wave- 

 length 2-94 



2-44 Contours of equal diffraction coefficient gap width = 1 wave- 

 length 2-94 



2-45 Contours of equal diffraction coefficient gap width = 1.41 wave- 

 lengths 2-95 



