5-m (16.4-ft) wave conditions with the +1.5-ft (+1.6-ft) swl. Maximum velocities 

 seaward of the new entrance (along the causeway extension) for Plan 14 were 

 1.62 mps (5.3 fps) for 12-sec, 6-m (19.7-ft) waves with the +4.0-m (+13.0-ft) swl. 



The general movement of tracer material for representative waves from 137, 

 182, and 227 deg is presented in Plates 42-47 for Plans 13 and/or 14. For waves 

 from 137 deg, sediment along the shoreline west of the causeway moved to the east 

 toward the structure, and sediment along the causeway moved seaward for Plans 13 

 and 14. Sediment along the shoreline east of the new breakwater moved shoreward 

 and slightly to the west, sediment midway along the new breakwater split, with some 

 moving to the north and some to the south, and sediment along the seaward portion 

 of the new structure moved seaward along the breakwater. For waves from 182 deg 

 with Plan 14 installed, sediment along the shoreline west of the causeway moved to 

 the east toward the structure, and sediment along the causeway split with some mov- 

 ing shoreward and some seaward along the structure. Sediment along the shoreline 

 east of the new breakwater moved shoreward and slightly west, while sediment 

 along the midway portion of the new breakwater moved to the north along the struc- 

 ture and through the breach, and sediment along the head of the new breakwater 

 moved seaward and across the new entrance. For waves from 227 deg with Plan 14 

 installed, sediment along the shoreline west of the causeway moved east toward the 

 structure, and sediment along the causeway moved seaward along the structure 

 around its head and across the entrance. Sediment along the shoreline east of the 

 new breakwater generally migrated shoreward; sediment about midway along the 

 new breakwater moved to the north; and sediment in the vicinity of the head of the 

 new breakwater moved seaward. 



Results of wave height experiments for Plan 17 are presented in Table 4 for 9- 

 and 12-sec waves from 227, 182, and 137 deg with the +0.5-m (+1.6-ft) swl. For 

 2-m (6.6-ft) wave conditions, maximum wave heights were as follows: 



Outer causeway dock (gauge 5) 

 Waves from 1 37 deg 



2.71 m (8.9 ft) 



Inner causeway dock (gauge 6) 

 Waves from 1 37 deg 



2.56 m (8.4 ft) 



Turning area (gauge 13) 

 Waves from 1 82 deg 



2.62 m (8.6 ft) 



Interior channel (gauge 8) 

 Waves from 1 37 deg 



0.3 m (1.0 ft) 



For 5-m (16.4-ft) incident conditions, maximum wave heights were as follows: 



30 



Chapter 4 Experiments and Results 



