ERDC/CHL CHETN-I-66
June 2002
Figure 4. Large shoal bathymetry (parent and nested grids)
Table 1
Example Shoal Dimensions
Shoal
Longshore Dimension, m
Cross-shore Dimension, m
Large
2000
1000
Medium
1000
500
Small
500
250
was used with the parameters suggested by Smith, Sherlock, and Resio (2001). Figure 5 shows an
example large-shoal simulation wave field from the fine grid and the coarse grid, and Figure 6 shows
the nested grid with morphic and linear interpolation from the coarse grid. The coarse grid has seven
points resolving the shoal and cannot represent the wave pattern in the lee of the shoal (maximum
wave height of 2.6 m compared to 3.2 m on the fine grid). The nested grid applications provide a
reasonable representation of the full fine grid simulation (maximum wave heights of 3.1 m compared
to 3.2 m for the fine grid), with approximately a 50 percent reduction in computational time (input
boundary spectra had 250-m spatial resolution). The nested grid simulations could be improved to
exactly match the fine grid by placing the nesting boundary offshore of the shoal.
4
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