placed between Profiles 1 and 3. Core-Locs were placed according to the meth- 

 od given by Melby and Turk (1995). 



The number of Core-Loc units placed on the breakwater, or density of units, 

 was based on the equation: 



*=4>V^ (2) 



A 



where TV is the number of units in a given area, A is the section area, V is the 

 armor unit volume, is the packing density coefficient which is dependent upon 

 armor layer thickness and armor layer porosity. Armor layer thickness is equal 

 to about 0.92 of the respective Core-Loc leg length and the average armor layer 

 porosity is about 60 percent. Core-Loc is a relatively new armor unit and tests 

 are ongoing to determine optimal and constructable placement density of the 

 units. For this stability study, <fi was purposely unspecified so that each model 

 armor placement would be a natural coverage and not exceed prototype construc- 

 tion limitations. For the tests conducted, (p ranged from 0.55 to 0.63 depending 

 on the base area covered and variance due to the random nature of the packing. 



Reporting Model Observations 



Visual inspections were made during and after wave action on the structure. 

 Because Core-Locs are placed in one layer, less than 2 percent displacement by 

 unit count was desired. 



Chapter 2 The Model 1 3 



