U7. Putnam and Arthur (69) presented experimental data verifying a 

 method of solution proposed by Penny and Price (66) for the behavior of 

 waves after passing a single breakwater. Blue and Johnson (12) have dealt 

 with the problem of the behavior of waves after passing through a gap, 

 as between two breakwater arms. 



U8. Waves Passing a Single Breakwater . - The solution to this problem 

 is presented in Appendix E. From this solution an overlay has been prepared 

 (Figure 19) which for the case of uniform depth shoreward of the breakwater, 

 shows positions of diffracted wave crests and lines of equal wave height 

 reduction, 



U9» The diagram of Figure 19 is presented in dimensionless form and 

 can therefore be used for any condition of wave period and water depth by 

 scaling the entire figure up or down. The manner of use of the overlay 

 is illustrated in Figure 20. 



Breok water >>M ^""^ _Vl is negative 



Wave Crests 



DIFFRACTION FOR A SINGLE BREAKWATER — NORMAL INCIDENCE 



FIGURE 20 



31 



