ERDC/CHL CHETN-I-67
June 2003
Figure 6. Field gage locations, April to July 2001
EXISTING AS-BUILT BREAKWATER WAVE HEIGHTS: The existing as-built breakwater
gap was 122 m (400 ft). In this section, predicted wave heights within the harbor area from the
CGWAVE model are presented for nine wave conditions. Because a distribution of historical wave
conditions is not available for this location, all wave conditions are assumed to occur with equal
probability. Waves with a T = 6 sec, however, are probably the most typical wave conditions due to
the shallow depths and the orientation of the harbor within Chesapeake Bay.
Figure 10 is a contour plot of the wave height H for T = 6 sec waves and three wave directions
traveling to θ = 135 (NW), 180 (W), and 225 (SW) deg, respectively. The constant-length vectors
illustrate wave directions within the domain. The incident wave height is 1.0 m (3.3 ft) on the
offshore boundary and decreases as waves propagate into the harbor. Larger wave heights occur to
the north for waves traveling to the northwest, to the west and vicinity of the PP for waves traveling
to the west, and to the southwest and vicinity of the CD for waves traveling to the southwest. The
wave patterns are similar for the longer wave periods (not shown), and display slightly different
penetration patterns of wave energy.
Figures 11 and 12 show the predicted wave heights H along T1 and T2, respectively, for the three
wave periods T = 6, 10, and 16 sec for the existing configuration. The three curves on each plot
represent the three different wave directions θ = 135 (NW), 180 (W), and 225 (SW) deg,
respectively. For transect T1 going to the CD, waves traveling to the southwest (green, short dash
line) are the highest in the inner part of the harbor. Waves traveling to the west (blue, dash line)
become higher in the vicinity of the BE. The crossover point between these two wave directions
moves closer to the BE as wave period increases. Waves traveling to the northwest (red, solid line)
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