Structure 4
The Structure 4 configuration consisted of two jetties perpendicular to shore.
The placement of the gauges was bayward (Figure 12) as opposed to seaward as
with the Structure 1 and 2 configurations. A total of four experimental
conditions were studied, as noted in Table 2. For no-flood current conditions
(Chapter 2), irregular waves of 0.8 sec, 6.1 cm (0.2 ft), and 1.6 sec, 4.6 cm
(0.15 ft), and monochromatic waves of 0.8 sec, 4.6 cm (0.15 ft), were produced.
The flood current conditions were created and the same irregular wave, 1.6 sec,
4.6 cm (0.15 ft), was repeated. Appendix H contains data tables for the gauge
arrangement, shown in Figure 10, for each experiment.
The tables contain gauge number, depth at the gauge, average water surface
elevation relative to the still-water level, significant wave period, significant
wave height, average wave height, and maximum wave height. Appendix I
presents contoured dimensional wave height plots. Figure 18 shows the 0.8-sec
wave experiment. The x-y arrows depicted on the plots indicate the basin x-y
position that corresponds to the plot origin (0.0). Appendix J contains sample
spectral energy density versus frequency plots for selected wave gauge locations.
The overall basin bathymetry, the shore-parallel breakwater structure, the dogleg
jetty structure, and the parallel jetties structure are referenced in Appendix K.
Due to the large volume of data, it has been placed on the accompanying CD.
The location of wave gauges and the parallel jetties within the coordinate system
is given in Appendix O.
29
Chapter 4 Physical Model Results
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