was divided into middle and upper zones to compare stability of the crest with 

 Plan 2 . Percent damage to the upper zone of Plan 3 was comparable to Plan 2 , 

 in which (H mo ) i < 22 ft . However, percent damage increased to 63 percent 

 for (H mo ) i > 22 ft , which is almost twice the damage with "A" Stone. Plan 5 

 was identical to Plan 2 in that it consisted of "A" Stone in the upper section 

 and "A-l" Stone in the middle section, except a transition layer of smaller 

 stones was added to reduce wave transmission through the structure. The 

 wider cross section of Plan 5 improved the stability of the rehabilitation 

 sections . 



49. Stability coefficients were calculated for each test section 

 (Table 10) . The wave height used in Equation 2 was the average of all runs at 







Table 



10 









Stab: 



Llitv Coefficients 









(Hmo)! 





W 50 





Plan 



Area 

 Sea 



ft 





tons 



K d 



1 



13.8 



11.0 



3.3 



1 



Harbor 



18.2 





15.0 



5.6 



2 



Sea 



13.7 





11.0 



3.3 



2 



A 



16.5 





15.0 



4.2 



2 



A-l 



22.5 





8.5 



19.3 



3 



Sea 



13.7 





11.0 



3.3 



3 



Harbor 



18.2 





8.5 



9.9 



3 



Zl 



13.8 





8.5 



4.3 



3 



Z2 



23.5 





8.5 



21.4 



4 



Sea 



- 





- 



- 



4 



A 



- 





- 



- 



4 



A-l 



- 





- 



- 



5 



Sea 



12.0 





11.0 



2.2 



5 



A 



21.0 





15.0 



8.6 



5 



A-l 



21.2 





8.5 



15.7 



which 2 -percent damage occurred for the test section. Stability coefficients 

 were identical on the sea side for Plans 1-3, but K d was lower for Plan 5. 

 This may be an effect of additional back pressure caused by the transition 

 layer included in Plan 5. The stability coefficient on the harbor side was 

 higher for Plan 3 than Plan 1, although Plan 3 consisted of lighter armor 

 stone in the section. The highest nondamaging wave was identical for both 

 sections, which means that the Plan 3 section was not necessarily more stable 

 than the Plan 1 section, but the reduction of armor weight from "A" to "A-l" 



36 



