Figure 12. Incident shortwave directions modeled (To convert feet to meters,
multiply by 0.3048)
A hypothetical time-history of wind waves and swell was reconstructed to
represent the wave climate. The time-history contained 10,000 observations, so
the number of observations in each Tp and θp bin is the percent occurrence for
that bin multiplied by 100. Values of Hs were assigned to each observation to
properly represent statistics of Hs and Tp bins. The specific Hs values were
randomly varied over the bin range. With this hypothetical time-history,
procedures used in previous studies where actual time-histories of incident waves
were available could be applied to analyze waves at any point in the model
domain.
Incident longwave conditions considered are given in Table 5. Previous
harbor resonance studies have helped to define a standard range of longwave
to reveal any significant resonant conditions. Based on that experience, a fine
resolution in wave frequency was used in this study over the full range of
possible resonant conditions (25- to 1,000-sec periods) to ensure that all
important peaks were identified. A total of 468 periods was considered, as in
previous studies. Only one approach direction is included, since past studies
have indicated that harbor response is relatively insensitive to incident longwave
direction. This direction, 144.8 deg azimuth, represents a wave coming from the
midpoint of the semicircular boundary and approaching the harbor entrance from
deep water.
19
Chapter 3 Numerical Model
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