PART IV: CONCLUSIONS 



26. Based on tests and results described herein in which dolos and 

 tribar armor are used to overlay existing armor stone on breakwater trunks and 

 subjected to breaking waves with a direction of approach of 90 deg, it is con- 

 cluded that: 



a. Randomly placed dolos are an acceptable option, provided that a 

 stability coefficient of 12 is used to size the units. 



b. Dolos stability proved to be sensitive to d/L and H/d with 

 minimum stability occurring at the lower values of d/L and 

 higher values of H/d , i.e., longer wave periods in shallower 

 water. 



c. Randomly placed tribars are not recommended at slopes steeper 

 than IV on 2H; however, they may be used at milder slopes with 

 a stability coefficient of 9. 



d. Uniformly placed tribars are an acceptable option for a IV-on- 

 1.5H slope provided that they are used in concert with the but- 

 tressing stone, size selection is based on a stability coef- 

 ficient of 7, and placement of the units replicates that used 

 in the model. 



e. Tribar stability appears to be insensitive to d/L and H/d 

 for both types of placement. 



17 



