YCOOR The y-coordinate where the wave field is to be calculated. 



Together with XCOOR, they determine whether the position is within 

 or beyond the diffraction shadow zone 



YDISS The value of y after the use of the dissipative interface 



YOLD The previous value of y 



YZERO The berm contour location 



Zl See equation (37) 



Z2 See equation (37) 



64 



