a. MINUS AREA 



b.PLUS AREA 



c. REGULAR AREAS 



Figure 5. Conceptual diagram show- 

 ing minus, plus, and regular areas 



Explicit Numerical Model 



46. Equation 1 will be discretized using a staggered grid representa- 

 tion, as shown in Figure 6. For convenience, Equation 1 is reproduced here. 



3t + D ax 







(1) 



The x-axis, which runs parallel to the trend of the shoreline, is divided into 

 N calculation cells by N + 1 cell faces (solid vertical lines in Figure 6), 

 with a general cell denoted by i . On this grid, Q-points and y-points are 



19 



