4 Conclusions 



Based on tests and results reported herein, it is concluded that: 



a. The model was able to accurately replicate prototype wave energy 

 transmission, as evidenced in test results of Plan 1A3. 



b. Test results for the detached reefs (Plans 2, 2A, 3, 4, 4A, and 4A1) 

 show that all plans except 2 A reduce 19-ft incident waves to heights of 

 13 ft or less and eliminate damage to the existing breakwater. Also, 

 major changes can be made in the geometry and size of the reef with 

 little resultant change in the observed transmission, as shown in Fig- 

 ures 8-11. 



c. Plans 5 and 6 showed that a 100-ft-wide attached berm constructed of 

 5-ton stone would also be successful in protecting the existing 

 structure and reducing wave heights in the harbor. 



d. Test results for Plans 7, 8, and 9 show that 18-ton stone would need to 

 be placed on no steeper than a IV on 2.25H slope to be stable on the 

 lakeside of the breakwater. 



e. Plan 8A, the only harbor-side repair option tested, was one of the most 

 successful plans in terms of reducing wave energy; however, stability 

 was marginal. 



/. Plan 10 yielded the largest reduction in wave energy transmission in 

 concert with acceptable stability. 



g. Plan 10A, a 50-ft-wide attached berm, was the only improvement plan 

 that did not show acceptable stability. 



h. Plan 1 1 , restacking of the existing armor, was not effective in 

 significantly reducing wave transmission. 



Generally, the submerged reefs and restacking of the existing armor were 

 the least effective approaches to reducing wave transmission, whereas the toe 

 berms and the large-stone overlays were the most effective. However, the 

 submerged reefs proved to be the most effective in reducing or eliminating 

 damage to the existing breakwater. 



Chapter 4 Conclusions 



33 



