ASjPS Directional spread parameter of integrated direction 

 spectrum 



A^sw Spectrally weighted directional spread parameter 



h4> Phase difference 



rj Sea surface elevation 



6 Wave direction (in degrees), equals 'idO-B'/l'n 



6 Positioning parameter 



6. ^^^ direction of a set of M discrete directions 



6^ TB^^ direction of a set of M discrete directions 



fi^in Direction at which there is a minimum of energy 



6^ Extreme direction of a set of M discrete directions 



6^ Positioning parameter of a 180-deg directional 



distribution function at frequency fj, 



d';^^ Positioning parameter of mode k within a directional 



distribution at frequency f^^ 



^ Peak direction 



6 n Direction of peak in directional distribution function at 

 frequency fj, 



jCk) 

 P.n 



r ,n 



Peak direction within mode k of a directional 

 distribution at frequency f„ 



6 pQ Direction at peak of frequency-direction spectrum 



? jpg Direction at peak of integrated direction spectrum 



"^'^^ Discrete direction bounding left side of k*^*^ mode of 

 directional distribution at frequency fj, 



ig*^^ Discrete direction bounding right side of k*^** 

 directional distribution at frequency f^, 



Peak direction in analytic models of directional 

 distribution functions 



Specific wave directions 



Direction at which cumulative distribution function equals 

 0.25 at frequency f„ 



B4 



