26 



first 2.5 tir of testing is shown in Photo 77. The shoreline remained slighfly 

 more stable than it did for the same test conditions for existing conditions 

 (Photo 22). The berni initially decreased the level of wave energy reaching 

 the shoreline and resulted in a decrease in the rate of erosion along the shore- 

 line. Sediment tracer along the shoreline after 5 to 15 hr of testing is shown 

 in Photo 78. It was noted that the berm material actually began feeding the 

 beach after 8 hr, but continued exposure to wave action resulted in the loss of 

 berm protection and the northerly movement of material out of the Camp Ellis 

 Beach area. 



The 76,460-cu-m (100,000-cu-yd) submerged Plan 5 berm is shown in 

 Photo 79 prior to testing. Similar to the Plan 4 berm, all tests were conducted 

 with a +2.7-m (+8.8-ft) swl for representative test waves from 101, 88, 75, and 

 101 deg, respectively, for a cumulative time of 15 hr. Migration of the berm 

 after 2.5 and 5 hr of testing, respectively, is shown in Photos 80 and 81. 

 Progression of berm movement after additional testing with 13-sec, 3.7-m 

 (12-ft) waves from 88 deg for 3 hr and 11-sec, 4.3-m (14-ft) waves from 

 75 deg for 3 hr is shown in Photos 82 and 83, respectively. An additional 

 4 hr testing with 13-sec, 3.7-m (12-ft) waves from 101 deg resulted in the 

 migration pattern as showoi in Photo 84. The berm material moved toward 

 Camp Ellis Beach for all test waves. Sediment tracer material was placed 

 along the shoreline prior to testing of the submerged berm. The general 

 movement of material along Camp Ellis Beach for 13-sec, 3.7-m (12-ft) test 

 waves from 101 deg during the initial 2.5 hr of testing is shown in Photo 85. 

 The shoreline appeared to erode at about the same rate as it did for existing 

 conditions for the same test conditions (Photo 22). Sediment tracer movement 

 along the shoreline is shown in Photo 86 after 5 to 15 hr of testing. Berm 

 material began feeding the beach after 8 hr, but additional exposure to wave 

 action resulted in material eventually moving to the north. 



Results of wave height tests conducted for Plan 6 are presented in Table 6 

 for test waves from 101 deg with the +2.7-m (+8.8-ft) swl. Maximum wave 

 heights along Camp Ellis Beach (Gages 1-6) were 1.5 m (4.8 ft) for 15-sec, 

 4.3-m (14-ft) test waves. Even though massive overtopping of the structure 

 was observed for some test waves, the spur was effective in reducing wave 

 heights along the shoreline, relative to those obtained for existing conditions 

 (maximum wave heights of 2.7 m (8.9 ft) for the +2.7-m (+8.8-ft) swl for test 

 waves from 101 deg). Typical wave patterns with Plan 6 installed in the 

 model are shown in Photo 87. 



General movement of tracer material along the beach for Plan 6 is shown in 

 Photos 88 and 89 for 13-sec, 3.7-m (12-ft) test waves from 101 deg with the 

 -1-2.7-m (-(-8.8-ft) swl. Photo 88 presents movement of tracer material for the 

 first 2.5 hr of the test, and Photo 89 shows tracer movement between 3 and 

 8 hr. Tracer material moved toward the shoreline and then began migrating 

 north. The Plan 6 spur resulted in erosion at a much lesser rate than existing 

 conditions; however, test results indicated the material along the beach would 

 erode after continued exposure to wave action. 



Chapter 4 Tests and Results 



