0.00 at the back wall of the wedge in the shadow zone. The diagram patterns 

 are relatively smooth and simple. 



27. Notably, the diagrams do not include phase information of the wave 

 response which is usually unimportant in most engineering practice. Should 

 the phase of the wave response need to be known, one can always use the com- 

 puter program WEDGE to calculate it. 



28. The contour diagrams of the amplification factor, similar to the 

 ones presented by Wiegel (1962) and shown in the SPM (1984), were also plotted 

 as typically shown in Figure 16. Examination of those contour diagrams indi- 

 cates that, in subregion III, the results are identical to Wiegel 's results. 

 But in subregion II the contour patterns for the amplification factor (or the 

 diffraction coefficient K' used in the SPM (1984)) equal to 1.0; thus the 

 present results are far more complicated than Wiegel' s. The author believes 

 that Wiegel' s results may lose accuracy because of insufficient resolution of 

 the computational tools during the late fifties and early sixties. Neverthe- 

 less, such inaccuracies are usually either tolerable or immaterial in most 

 engineering practice. 



29. The contour patterns in subregion I are very complex, and it is 

 difficult to track specific contours. Therefore, for clarity only the patched 

 diagrams are presented, and the contour diagrams are omitted in this report. 



Vertical Wedge of 90-Deg Wedge Angle 



30. When the wedge angle is equal to tt/2(0 = 3ir/2) , the vertical 

 wedge occupies the entire fourth quadrant of the space as shown in Figure 17. 

 Wave response was calculated at 1 , 100 grid points intersected at r/A 



= 0.5,(0.5) ,10.0 and 9 = 0, (tt/36) ,3ir/2 for the incident wave angle a 



= 0,(tt/12) ,ir . The wave response at the origin is obtained by substituting 



v = 1.5 into Equation 27 as follows: 



♦(0,6) = | (32) 



Those calculated results were used to construct the amplification factor dia- 

 grams by following the same procedures described for the case of the thin 

 semi-infinite breakwater. The diagrams are shown in Figures 18 through 27. 

 Because of symmetry of the results, the diagrams for the incident wave angle 

 a > 3ir/4 can be obtained from those for an incident wave angle of ir - a . 



27 



