. Characteristics of reef breakwaters. Breakwaters; Ocean waves; Water waves. PART II: LABORATORY SETUP AND TECHNIQUES USED 7. To date, 205 two-dimensional laboratory tests of reef breakwaters have been completed. These tests were conducted in a 61-cm-wide channel within CERC's by by tank (Figure 1). All tests were 5(m) o DENOTES WAVE GAGE LOCATION WALL OF WAVE TANK TO WAVE. 1 ON 15 I GRAVEL WAVE ABSORBER BEACH : SHOALING SLOPE | GjAVJLJ«AJiEJiBS^R|EOEACHd EFlftANNEL """wauT oo o ^_ -iEEj ° ° ABSORBER REEF _P0N0!NG,RELIEF CHANNEL BREAKWATER W GRAVEL WAVE ABSORBE
. Characteristics of reef breakwaters. Breakwaters; Ocean waves; Water waves. PART II: LABORATORY SETUP AND TECHNIQUES USED 7. To date, 205 two-dimensional laboratory tests of reef breakwaters have been completed. These tests were conducted in a 61-cm-wide channel within CERC's by by tank (Figure 1). All tests were 5(m) o DENOTES WAVE GAGE LOCATION WALL OF WAVE TANK TO WAVE. 1 ON 15 I GRAVEL WAVE ABSORBER BEACH : SHOALING SLOPE | GjAVJLJ«AJiEJiBS^R|EOEACHd EFlftANNEL """wauT oo o ^_ -iEEj ° ° ABSORBER REEF _P0N0!NG,RELIEF CHANNEL BREAKWATER W GRAVEL WAVE ABSORBER BEACH AUXILIARY CHANNEL "MATERIAL] GRAVEL WAVE ABSORBER BEACH GRAVEL WAVE ABSORBER BEACH WALL OF WAVE TANK PLAN VIEW Figure 1. Plan view of wave tank and test setup conducted with irregular waves. The spectra used had wave periods of peak energy density T * ranging from about to sec, and water depth at the structure d ranged from 25 to 30 cm. Signals to control the wave blade were stored on magnetic tape and transferred to the wave generator through a computer data acquisition system (DAS). For this study four files were stored on the tape which could produce a spectrum with a distinct period of peak energy density. Table 1 gives the nominal period of peak energy density for each file. 8. If there were no attenuation of the signal to the wave generator, the files used were intended to produce a saturated spectrum at all frequences above the frequency of peak energy density for the water depth at the wave blade. For frequencies lower than those of the peak, the energy density de- creased rapidly. This procedure produced a spectrum of the Kitaigorodskii type as described by Vincent (1981). The amplitude of the signal to the wave generator was attenuated by a 10-turn potentiometer in a voltage divider * For convenience, symbols and unusual abbreviations are listed and defined in the Notation (Appendix C).. Please note that these images are extracted from scanne
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