GAGE#12 3 TOPOFTANK GAGE#456 



100 80 60 



DISTANCE ALONG TANK FLOOR, FT 



Figure 3. Wave gage location in 3- by 3- by 

 150-ft-long wave tank 



conservation of wave period to be the period that was programmed to be gener- 

 ated by the wave machine and therefore will be referred to as the nominal 



T P • 



Test conditions 



8. A wide range of wave conditions was represented in these tests. The 

 periods of peak energy density T tested were 5, 7, 8, 9, 10, and 12 sec in 

 the prototype. The still-water levels (swl) tested ranged between about +8.58 

 and +10.80 ft National Geodetic Vertical Datum (NGVD). The tests produced 

 local zero-moment wave heights ranging from about 2.5 to 9.0 ft with most 

 heights in the 5- to 8-ft range. Tabulated test conditions and data results 

 are given in Appendix A. 



Test procedures 



9. During a single test run, irregular waves were generated contin- 

 uously for 33 min. The ADACS was programmed to produce a modified Joint North 

 Sea Wave Program (J0NSWAP) wave spectrum for the water depth at the wave 

 blade. Water depths at the wave blade ranged from about 32.0 to 35.0 ft. 

 J0NSWAP spectra tend to be rather narrow (Hasselmann et al . 1973), in that a 

 large portion of the total energy is concentrated near the frequency associ- 



ated with the period of peak energy density T 



Since wave shoaling and 



breaking were very conspicuous between the wave blade and structure for most 



11 



