ELEVATION (FT NGVD) 
3. 
8. 
7. 
6. 
s. 
4. 
3. 
e. 
dq 
@.. 
LEGEND 
sie iy oa eer rn tee at SURGE PLUS TIOE STAGE FREQUENCY 
_—-—-— — NORTHEASTER 
COMB>NEO HURRICANE ANDO NORTHEASTER 
SANOY HOOK NJ 
Figure 50. Still-water level stage-frequency 
curves - Sandy Hook, New Jersey 
Storm Surge Model 
199. The WES Implicit Flooding Model (WIFM) was used as the hydrody- 
namic storm surge model. The numerical and hydrodynamic features of WIFM are 
discussed in Butler (1978) and the application of WIFM to coastal studies is 
demonstrated in numerous reports, including Butler (1983). WIFM solves the 
vertically integrated, dynamic, shallow-water wave equations of fluid motion 
using an alternating direction, implicit, finite difference algorithm. The 
model allows subgrid barriers (which can be non-overtoppable, overtoppable, or 
submerged) to be included in the grid. An important feature of WIFM is the 
capability for using an exponentially stretched numerical grid, which permits 
concentration of grid resolution in areas of interest. Also included in the 
code is the capability to flood or dry individual cells during a simulation. 
Numerical grid 
200. The computational grid for this project contains 1,938 cells, with 
34 cells along the vertical axis and 57 cells along the horizontal axis. The 
grid covers the area from Sandy Hook Coast Guard Station to Long Branch and 
the tidal regions of the Navesink and Shrewsbury River basins. Cell size 
109 
