Approach 



3, Model breakwaters and armor units are being used to experimentally 

 investigate the stability response of various armor combinations for selected 

 structure geometries and wave conditions. It would be an extremely extensive 

 task to comprehensively investigate all different types of existing armor 

 units; therefore, this research effort will address only the three types 

 (stone, dolos, and tribars) of armor most commonly used in the Corps. Selec- 

 tion of these armor types should give test results the widest range of appli- 

 cability possible. Tests will be conducted with breaking wave conditions on 

 no-damage, no-overtopping breakwater trunk and head sections using sea-side 

 slopes of 1V:1.5H and IV: 2H. Test results for dolos and tribar overlays of 

 existing stone armor and dolos overlays of existing dolos have been reported 

 (Carver and Wright 1987a and 1987b). 



Purpose of Study 



4. The purpose of the present investigation was to obtain design guid- 

 ance for dolos overlays used to rehabilitate tribar-armored rubble-mound 

 breakwater and jetty trunks subjected to breaking waves. More specifically, 

 it was desired to determine the minimum weight of individual armor units (with 

 given specific weights) required for stability as a function of: 



a. Sea-side slope of the structure. 



b. Wave period. 

 £. Wave height, 

 d. Water depth. 



