Structure 3

simulate diffraction through a gap, such as shown in Figure 1. The placement of

the gauges was bayward (see Figure 11), as opposed to seaward, as with the

Structure 1 and 2 configurations. For some of these experiments, the physical

model was arranged to produce a flood current as discussed in Chapter 2. The

wave direction remained perpendicular to the shoreline, 0 deg, throughout the

testing sequence. A total of six 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 three wave conditions were repeated. Appendix F contains

data tables for the gauge arrangement, shown in Figure 9, 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 G

presents contoured dimensional wave height plots. Figure 17 shows the 0.8-sec

wave experiment wave height contours and wave direction from the velocity

gauges. 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 within the coordinate system is given in Appendix N.

27

Chapter 4 Physical Model Results