







i = 



1 TON 





y- AXIS 





















i-i,j-i 



i-i,i 



i-1,i + l 



















^r 





1 TOM 





i,j-i 





1,] 





i,i+1 



Ax 







i+i,j-i 



'+i,i 



i+1,i+1 













Ay 











y 



r 

















Figure 6. Definition of coordinate system and grid cell 

 conventions used in RCPWAVE 



35. From Snell's law. 



(33) 



where c is the deepwater wave celerity (defined to be -j-) , an estimate of 



the local wave angle is obtained everj^where. This estimate assumes that the 

 bottom contours are parallel with the y-axis. If the bottom bathymetric 

 contours make a known nonzero angle with the y-axis, a better first guess for 

 the wave angles can be made. The new approximation is 



, . .,„- /""<"o - 'A . 



(34) 



25 



