discussions with the US Army Engineer District, Los Angeles, it was decided to 

 discontinue testing of this plan. 



Stability tests of Plans 18 and 26 

 for a 67.5-deg angle of wave attack 



58. Plan 18 (Plate 30 and Photos 220-222) was constructed the same as 

 for the 90-deg angle of wave attack except for a modification to the shoreward 

 transition. Two rows of rehabilitation dolosse encompassed the existing units 

 at the shoreward end. A total of 43^ 42-ton rehabilitation dolosse were 

 placed. Subjection to Hydrograph A displaced three dolosse from the shoreward 

 transition toe. The seaward transition suffered extensive damage during test- 

 ing with 13 units being displaced. Photos 223-225 show the structure after 

 testing with Hydrograph A. Plan 18 was rebuilt using 447 42-ton rehabilita- 

 tion dolosse and subjected to Hydrograph B. The seaward transition again 

 sustained extensive damage and the shoreward transition had moderate damage. 

 Thus, Plan 18 proved to be unacceptable for the 67.5-deg angle of wave attack. 

 Photos 226-228 show the structure after testing with Hydrograph B. 



59. Plan 26 (Plate 31 and Photos 229-231) was constructed the same as 

 for the 90-deg angle of wave attack. A total of 410 42-ton dolosse and 135 

 25-ton armor stone were placed. Plan 26 was subjected to the abbreviated hy- 

 drograph with marginal results. Three dolosse were displaced from the lower 

 shoreward transition toe, and seven or eight units separated from the dolos 

 mat in this area. Two units were displaced from the seaward transition but 

 they did not affect the overall stability of this region. There was consid- 

 erably less sloughing off of the buttressing stone than from the other wave 

 direction as waves tended to push the stone against the dolosse rather than 

 wash it out the dogleg. Photos 232-234 show the structure after testing. 

 The test section was rebuilt and subjected to the abbreviated hydrograph 

 again, this time with satisfactory results. Photos 235-237 show Plan 26 

 after the repeat test. Plan 26 was rebuilt and subjected to Hydrograph A. 



A total of 417 42-ton dolosse and 135 25-ton armor stone were placed. There 

 were five dolosse displaced from the shoreward transition toe and some sepa- 

 ration of units occurred in this area; however, the region appeared to sta- 

 bilize during testing and the amount of movement was considered acceptable. 

 One unit was washed up on the cap near the center of the rehabilitation area. 

 Photos 238-240 show the structure after testing. Plan 26 then was rebuilt 

 with the same modification to the shoreward transition as for Plan 18. 



24 



