(Concluded) 



T r ■ " 8C 



Incident H„„. ft 



Transmitted //„„, ft 



mo' 



c, 



9.0 



2.8 



0.5 



0.18 



9.0 



4.9 



0.9 



0.18 



9.0 



6.8 



1.2 



0.18 



9.0 



8.2 



1.4 



0.17 



9.0 



9.2 



1.6 



0.17 



9.0 



10.6 



1.7 



0.16 



11.6 



1.9 



0.6 



0.32 



11.6 



4.1 



1.1 



0.27 



11.6 



6.7 



1.6 



0.24 



11.6 



9.3 



2.0 



0.22 



11.6 



11.7 



2.4 



0.21 



11.6 



13.9 



2.8 



0.20 



11.6 



17.6 



3.7 



0.21 



11.6 



19.9 



4.4 



0.22 



11.6 



21.5 



5.0 



0.23 



Transmission results are plotted in Figure 27. These data show that the 

 1-ft transmission criterion is reached for 7-sec, 8-ft; 9-sec, 5-ft; and 11-sec, 4- 

 ft incident waves. The 3-ft transmission criteria is exceeded by 15-ft, 

 11.6-sec waves. As would be expected, results are very similar to those 

 observed for Plans 7 and 8. 



The stability response of Plan 9 was acceptable and intermediate to results 

 achieved for Plans 7 and 8. As shown in Photos 56-58, several armor stones 

 were displaced down the lakeward face from the vicinity of the swl; however, 

 the integrity of the overlay was not jeopardized. Two harbor-side armor 

 stones were displaced from the existing structure and two 18-ton armor stones 

 were displaced from the crest to the harbor side. 



Summary of Results (Plans 2-9) 



The first 12 improvement plans significantly improved stability of the 

 existing breakwater and reduced transmitted wave heights to some extent. In 

 order to help quantify performance, average transmission coefficients were 

 calculated, with the following results: 



Chapter 3 Tests and Results 



25 



