the dolosse near it. Photos 169-171 show the structure after testing. 



53. Plan 23 (Plate 25 and Photos 172-174) was similar to Plan 22, ex- 

 cept coverage was reduced near the crown of the dogleg where dolosse were not 

 needed and coverage was increased along the lower part of the seaward transi- 

 tion toe to provide additional protection in this area. A total of 484 42-ton 

 rehabilitation dolosse were placed. Damage was severe in the seaward transi- 

 tion area for the abbreviated hydrograph. Photos 175-177 show the structure 

 after testing. 



54. Plan 24 (Plate 26 and Photos 178-180) was similar to Plan 19, ex- 

 cept that the 25-ton armor stone used as a buttress extended back to the con- 

 crete block remnants. The buttress again was placed before the rehabilitation 

 dolosse and consisted of 25-ton armor stone two layers deep. The total number 

 of armor stones added was 278 with a total weight of 6,950 tons and a volume 

 of approximately 4,810 cu yd. A total of 387 42-ton dolosse were placed and 

 the test section was subjected to the abbreviated hydrograph. The rock but- 

 tress sloughed off during testing, as in Plan 19. However, the armor stone 

 did remain in place long enough to protect the dolosse from displacement. 

 Photos 181-183 show the structure after testing. Plan 24 was rebuilt and 

 subjected to Hydrograph A to see if the dolosse would survive a storm of 

 longer duration. A total of 410 42-ton dolosse and 293 25-ton armor stones 

 were placed. The dolosse in the shoreward transition sustained some damage 

 early in the testing, but this area stabilized and showed no movement during 

 the rest of the hydrograph. The buttressing armor stone in the seaward tran- 

 sition again sloughed off and was scattered down the dogleg, with most of the 

 damage occurring in the first half of the hydrograph. The dolosse in the sea- 

 ward transition remained stable throughout the testing, except for a slight 

 separation of dolosse in the lower seaward quadrant. Apparently the 25-ton 

 armor stone remained in place long enough for the dolosse to become nested 

 and interlock for the duration of Hydrograph A. At the end of Hydrograph A, 



a small amount of the 25-ton buttressing stone was left in the extreme lower 

 and upper areas of the original buttressing, but most of the stone was scat- 

 tered down the dogleg and/or was carried off the model section at sta 40+00. 

 Photos 184-186 show the structure after testing with Hydrograph A. Although 

 the dolosse remained virtually intact at this point, movement of the buttress- 

 ing armor stone was excessive and could possibly have done structural harm to 

 the tetrapod section further down the dogleg. Also, the dolos section was 



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