11. Due to differences in required boundary conditions between the 

 various models, and for reasons of economy, the first 17 columns of cells 

 along the west side of the grids (the interior area) were not used in RCPWAVE, 

 CURRENT, and the sediment transport model. This area is covered by Model A. 

 WIFM required the additional cells in the interior area in order to use the 

 prototype data available there for boundary conditions and to accurately simu- 

 late the complex tidal currents in the inlet. 



The Tidal Simulation Model, WIFM 



12. WIFM is a general long wave model which can be used for simulation 

 of tides, storm surges, tsunamis, etc. It allows flooding and drying of land 

 cells near the shoreline. It is a depth-averaged model so that variations in 

 the vertical direction are averaged in the model. It is used in the present 

 study to determine tidal elevations and velocities in the two horizontal 

 coordinate directions. The following description of WIFM is extracted from a 

 report by Leenknecht, Earickson, and Butler (1984). 



Equations of motion 



13. The hydrodynamics of the numerical model WIFM are derived from the 

 Navier-Stokes equations in a Cartesian coordinate system (Figure 5) . The long 



BENCHMARK DATUM 



Figure 5. Coordinate system for WIFM 



15 



