n 3.14159... 



p Mass density of sea water 



a , a 

 xx xy 



a , a Dimensionless radiation stresses 

 yx yy 



t, , t Bottom friction stresses in x- and y-directions 

 bx xy 



t Lateral shear stress due to turbulent mixing 



xy ° 



a) Radian frequency as it appears to a stationary observer 



a) Radian frequency when there is no current, 2tt/T 

 o M J o 



Superscripts 



r-1 Previous time level 



r Present time level 



r+1 Next time level 



* Intermediate time level 

 Subscripts 



b At breaking 



t Partial derivative with respect to time 



a 1 Partial derivative with respect to a, 



a Partial derivative with respect to a„ 



A4 



