L^/Lp = linear scale of the model 



S a = specific gravity of an individual armor unit relative to the 

 water in which it is placed, S a = 7 a /7 w 



7 W = specific weight of water, pcf 



11. Weight of prototype armor stone and their model equivalents used in 



this study were as follows: 



Armor Stone 



Prototype wt. 

 11-19 



tons 



Model wt. lb 



"A" 



0.442 - 0.764 



"A-l" 



6-11 





0.241 - 0.442 



"A- 2" 



3-8 





0.121 - 0.322 



Existing Seaside 



1-13 





0.04 - 0.523 



"T" 



1-3 





0.04 - 0.121 



» T _1» 



0.1-1 





0.004 - 0.04 



Test Facilities and Equipment 



12. Tests were conducted in a 300-ft-long, 6-ft-wide, 6-ft-deep wave 

 tank. Figure 3 describes the tank dimensions and bottom slopes. The toe of 

 the breakwater section was placed 242 ft from the wave board. Local 

 bathymetry was represented by a IV on 50H slope for a simulated prototype 

 distance of 1,050 ft (30-ft model) seaward of the breakwater section. 



13 . Waves were generated by an electronically controlled hydraulic 

 system, which included a piston-type wave board. Displacement of the wave 

 board was controlled by a command signal transmitted to the wave board by a 

 Digital Equipment Corporation (DEC) MicroVax I computer. Waves were produced 

 by the periodic displacement of the wave board. The command signals to drive 

 the wave board were generated on a DEC VAX 3600 computer. 



14. Wave data were collected by double -wire resistance -type gages, 

 sampled at 10 Hz. Nine wave gages were used, arranged in three arrays of 

 three gages each, which permitted calculation of incident and reflected wave 

 heights by the method of Goda and Suzuki (1976). Array 1 measured wave 

 heights near the wave board, Array 2 measured wave heights directly seaward 

 (approximately 350 prototype feet) of the structure, and Array 3 measured wave 

 heights directly shoreward of the structure. Wave heights measured at Arrays 

 2 and 3 were used to compute transmission coefficients. Water surface eleva- 

 tions recorded from the gages were stored on magnetic disk and analyzed using 



