1.0
East
East southeast
Anasosopo
Southeast
South southeast
0.8
South
South southwest
Southwest
0.6
Aua
Leloaloa
Anua
0.4
0.2
0.0
Site Location
Figure 14. Wave height amplification factor, average for 6- to 12-sec wave
periods
south southeast have the biggest impact. Amplification factors are near zero at
the highly sheltered Anua site. Bathymetry in the immediate area of the study
site can have a localized effect on amplification factor. For example, there is a
small, shallow hump just seaward of the output line at Aua which affects several
output points.
Although waves from the south at Anasosopo produce the highest
amplification factors, the hindcast wave climate shows that waves from this
direction rarely occur. To illustrate amplification factors which incorporate wave
climate information, a climatological average amplification factor was computed
at each output point by weighting each CGWAVE result by an appropriate
percent occurrence in the hindcast climate (Figure 15). Although these results
still do not represent directionally spread spectra, they provide a more realistic
perspective on how much incident wave energy is diminished at the study sites.
These results show that all of the sites have considerable protection from the
incident wave climate. Anasosopo is the most exposed site, but differences
between sites (other than highly protected Anua) are relatively small.
Evaluation against Operational Criteria for Wind
Waves and Swell
Standard operational criteria used by the U.S. Army Corps of Engineers
(USACE) for wind waves and swell in shallow draft harbors are:
23
Chapter 4 Harbor Response to Wind Waves and Swell
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