spectra, and repeat the tests. Results of the initial tests of Plan 1 A were as 

 follows: 



7"_. sec 



HpH 



H r n 



Ct 



7.0 



9.4 



1.4 



0.15 



9.0 



6.7 



1.2 



0.18 



11.9 



16.0 



4.8 



0.30 



These data show good agreement for the 7- and 9-sec wave periods; however, 

 energy transmission for the 1 1-sec period is too high. Finally, the structure 

 was rebuilt (Plan 1A1) and retested with the following results: 



TV, sec 



p 



HpH 



H r ft 



C t 



7.2 



9.8 



1.4 



0.14 



8.9 



6.9 



1.1 



0.16 



11.9 



15.6 



3.7 



0.24 



Figure 4 presents C ( as a function of wave period for the prototype data, 

 Plan 1, Plan 1A, and Plan 1A1, with Plan 1A1 showing excellent agreement 

 with the prototype. 



Stability tests of Plan 1A1 



Upon completion of the transmission tests, armor stability was investigated 

 by subjecting Plan 1A1 to progressively larger wave heights and observing the 

 number of armor stones displaced from t v 3 structure. Testing with the 7- to 

 9-sec waves showed these conditions to become steepness limited before 

 heights sufficient to produce damage could be reached; therefore, stability 

 tests were concentrated at the 1 1-sec period. The first testing of Plan 1A1 

 produced the following results: 



Step 



H mo .n 



Cumulative Number of Stones Displaced 



Lakeside 



Harbor Side 



1 



15.6 







2 



2 



17.2 







2 



3 



18.6 







4 



4 



19.9 







5 



5 



21.0 



1 



8 



6 



22.4 



1 



8 



7 



23.1 



3 



9 



Chapter 3 Tests and Results 



