ABSTRACT 



An. introductory discussion of the mathematics behind the direc- 

 tional analysis of ocean waves is presented. There is sufficient 

 detail for a reader interested in applying the methods; further, the 

 report can serve as an entry into the theory. The presentation is 

 basically tutorial but does require a reasonably advanced mathe- 

 matical background. Results of a program for the measurement of 

 directional ocean wave bottom pressure spectra are included as an 

 appendix. This second edition makes corrections to the first and 

 adds some details of an iterative directional analysis method. 



ADMINISTRATIVE INFORMATION 



This report was prepared to document the mathematical methods 

 used in connection with work done in support of Task SWOC SR 004 03 01, 

 Task 0582, and applied on Task ZR 000 01 01, Work Unit 0401-40. 



This report was originally issued in September 1971 as NSRDL/PC 

 Report 3472. 





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