S(f,6) Frequency-direction spectral density 



Stfn'QJ Frequency-direction spectral density at n* discrete 

 frequency and m* discrete direction 



S(8) Direction spectral density 



T Characteristic wave period derived from spectral peak 



(8 Convergence exponent in IMLE method 



7 Convergence coefficient in IMLE method 



50 Directional spread of wave energy at spectral peak 

 frequency 



A/ Finite frequency increment 



6 Wave direction 



6 m Element m of a discrete set of wave directions 



6 M Upper bound of discrete direction coordinate 



6 Peak wave direction 



p 



6 l Lower bound of discrete direction coordinate 



#25 Angle subtending 25 percent of wave energy 



75 Angle subtending 75 percent of wave energy 



B2 



Appendix B Notation 



