APPENDIX B: NOTATION 



* Complex conjugation operator 



a Wave amplitude 



a,^ Wave amplitude at n'''^ frequency and m''^ direction 



A Asymmetry parameter 



Aj, Asymmetry parameter of a 180-deg directional distribution 

 function at frequency f^^ 



A^''' Asymmetry parameter of mode k within a directional 

 distribution function at frequency f^ 



Co Coincident or in-phase part of product of Fourier 

 coefficients of two signals 



d Water depth 



df Frequency increment 



dd Direction increment 



D(f^,^j„) Directional distribution function at frequency fj, and 

 direction 6^ 



E Mean wave energy per unit crest length 



E' Sea surface variance per unit crest length 



f Wave frequency 



fjj n*'^ frequency of a set of N discrete frequencies 



f^ Highest frequency of a set of N discrete frequencies 



f Peak frequency 



f pp Frequency at peak of frequency-direction spectrum 



f jps Frequency at peak of integrated frequency spectrum 



£2 , ■ ■ ■ Specific wave frequencies 



F Fourier coefficient (complex) 



FD Frequency- direction 



F^ , F2 Specific (complex) Fourier coefficients 



Bl 



