ERDC/CHL CHETN-II-45
March 2002
Figure 6. Study site, Grays Harbor, WA, looking SE
Comparisons to Numerical and Physical Model Data. Comparisons of predictions of
wave transmission to data from numerical and physical models of the Grays Harbor spur further
assessed their applicability as implemented in GENESIS for the case study. Wave
transformation over the proposed spur was simulated with the fully nonlinear 1-D Boussinesq
6, 8 m; Tp = 10, 15, 20 sec; shape of offshore spectrum approximated using Jonswap, γ = 3.3) at
mean lower low water (mllw) and mean higher high water (mhhw). Predictions of Kt were
compared to wave transmission values computed from the numerical model results (Figure 7) for
the d'Angremond, Seabrook and Hall, and Ahrens equations. The root-mean-square error
(RMSE) between the calculated and predicted values are also given in Figure 7. The Ahrens
equation provides the best prediction, indicating the central role of structure type and that
relative submergence is a primary factor, with relative crest width playing a secondary role for
these conditions. As expected, the Seabrook and Hall equation also compares well with the
numerical predictions. The upper limit on the d'Angremond equation was invoked for each
wave simulation.
1
These simulation results were provided by Dr. Philip D. Osborne of Pacific International
Engineering, Seattle, WA.
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