especially for larger wave steepnesses. More definite conclusions must 

 await new experimental data. This basic information seems to be missing 

 in the existing literature. 



Nomographs are presented for determining the breaking wave 

 characteristics for given deepwater characteristics and bottom slope for 

 a plane beach. 



The remaining difficulties encountered in the shoaling and re- 

 fraction of a monochromatic wave are further amplified when dealing with 

 a more realistic directional spectrum of waves. What are the equivalent 

 monochromatic breaking wave characteristics that produce the same sediment 

 transport or longshore current? This question seems to be one of the more 

 important to face in the future research. 



37 



