28 



Current velocities moving northerly seaward of the structure were greater than 

 those moving along the shoreline. Typical wave patterns obtained for Plan 8 

 are also shown in Photos 99-102. 



General movement of tracer material along Camp Ellis Beach for Plan 8 is 

 shown in Photos 103-107 for representative test waves from 101 and 88 deg. 

 For the -i-2.7-m (+8.8-ft) swl, sediment tracer material migrated shoreward 

 (Photos 103-105) and remained in the immediate area. The material was not 

 as stable as it had been for Plan 7, but it did not migrate northeriy as it did for 

 most of the previous plans. For severe storm wave conditions with the 

 +3.7- and -f4.1-m (+12.0- and +13.6-ft) swl's, sediment overwashed the over- 

 bank (Photos 106 and 107) with runup similar to that of Plan 7, but signifi- 

 cantly less than that obtained for existing conditions. 



Results of wave height tests along Camp Ellis Beach with Plan 9 installed 

 are presented in Table 9 for test waves from 101 deg with the 0.0- and 2.7-m 

 (0.0- and +8.8-ft) swl's, test waves from 88 deg with the +2.7-, +3.7-, and 

 +4.1-m (+8.8-, +12.0-, and +13.6-ft) swl's, and test waves from 75 and 56 deg 

 with the +2.7-m (+8.8-ft) swl. For the 0.0-m (0.0-ft) swl, maximum wave 

 heights obtained along the beach (Gages 1-6) were 1.1m (3.7 ft) for 9-sec, 

 3.7-m (12-ft) test waves. With the +2.7-m (+8.8-ft) swl, maximum wave 

 heights were 2.5, 2.6, 2.3, and 0.4 m (8.3, 8.4, 7.5, and 1.4 ft) for the 101-, 

 88-, 75-, and 56-deg directions, respectively. Maximum wave heights along 

 the beach for the +3.7- and +4.1-m (+12.0- and +13.6-ft) swl's were 2.8 and 

 3.3 m (9.3 and 10.8 ft), respectively. 



Wave gages were placed in the navigation channel (Gages 13-17), and 

 wave height tests were conducted for Plan 9 and existing conditions for test 

 waves from the various directions. These data are compared in Table 10. For 

 test waves from 101 deg with the 0.0-m (0.0-ft) swl, maximum wave heights 

 were 2.2 m (7.2 ft) in the outer portion of the channel (Gage 17), 0.4 m 

 (1.4 ft) in the mid portion of the channel (Gage 15), and 0.5 m (1.7 ft) in the 

 inner portion of the channel (Gage 13) for Plan 9 versus 2.3, 0.3, and 0.33 m 

 (7.6, 1.0, and 1.1 ft), respectively, for existing conditions. For test waves from 

 all directions with the +2.7-m (+8.8-ft) swl, maximum wave heights for Plan 9 

 were 3.7 m (12.0 ft) in the outer portion of the channel, 1.9 m (6.1 ft) in the 

 mid portion of the channel, and 1.8 m (5.8 ft) in the inner portion of the chan- 

 nel versus 3.4, 1.3, and 0.4 m (11.2, 4.3, and 1.3 ft) for existing conditions, 

 respectively. The +3.7-m (+12.0-ft) swl yielded maximum wave heights of 



3.8 and 4.0 m (12.5 and 13.0 ft) in the outer portion of the channel, 2.1 and 



1.9 m (7.0 and 6.1 ft) in the mid portion of the channel, and 2.0 and 0.7 m 

 (6.6 and 2.3 ft) in the inner portion of the channel for Plan 9 and existing con- 

 ditions, respectively. With the +4.1-m (+13.6-ft) swl, maximum wave heights 

 for Plan 9 and existing conditions, respectively, were 4.2 and 4.3 m (13.8 and 

 14.2 ft) in the outer portion of the channel, 2.3 and 2.3 m (7.4 and 7.4 ft) in 

 the mid portion of the charmel, and 2.4 and 1.0 m (7.9 and 3.5 ft) in the inner 

 portion of the channel. In general, wave heights obtained in the navigation 

 channel (particularly the mid and inner portions) were significantly larger for 

 Plan 9 than for existing conditions. 



.=- Chapter 4 Tests and Results 



