Step 



H mo . ft 



Cumulative 

 Number of Stones Displaced 



Lakeside 



Harbor Side 



1 



15.6 



1 







2 



17.2 



1 



1 



3 



18.6 



1 



2 



4 



19.9 



1 



3 



5 



21.0 



2 



5 



6 



22.4 



4 



5 



7 



23.1 



5 



5 



The structure was rebuilt and an abbreviated repeat test was conducted with 

 the following results: 



Step 



M mo , ft 



Cumulative Number of Stones Displaced 



Lakeside 



Harbor Side 



1 



15.6 



1 



4 



2 



18.6 



1 



7 



3 



21.0 



2 



13 



4 



23.1 



2 



14 



Photos 17-19 show the structure after the repeat stability test. 



Summary and Development of Stability 

 Coefficients 



As expected, all plans tested reproduced prototype wave energy 

 transmission to some extent. Plans 1A1 and 1A3 most closely reproduced 

 prototype wave energy transmission. Wave heights observed just prior to 

 instability can be used in concert with the Hudson formula to determine 

 corresponding stability coefficients by rearranging the formula as follows: 



K = 



V a H 3 



W(S-ly cot a 



(1) 



and substituting 



y a = specific weight of armor unit, 145 pcf 

 W = weight, 12.4 tons = 24,800 lb 



Chapter 3 Tests and Results 



11 



