Sediment tracer experiments 



Sediment tracer experiments were conducted for existing conditions and 

 selected plans of improvement for representative experimental waves from the 

 various incident directions. Sediment tracer was introduced into the model along 

 the shoreline, or along the causeway and/or proposed breakwater to define 

 sediment tracer patterns and subsequent deposition areas. 



Experimental Results 



In analyzing results, the relative merits of various improvement plans were 

 based on measured wave heights, wave-induced current patterns and magnitudes, 

 and the movement of sediment tracer material and deposition areas. Model 

 wave heights (significant wave heights or H s ) were tabulated to show measured 

 values at selected locations. Wave-induced current patterns and magnitudes, 

 and sediment tracer patterns and subsequent deposition areas were shown on 

 plates. 



Existing conditions 



Results of wave height experiments for existing conditions are presented in 

 Table 1. For the +0.5-m (+ 1.6-ft) swl, maximum wave heights 1 were as 

 follows: 



Outer causeway dock (gauge 5) 



12-sec, 3-m (9.8-ft) waves from 137 deg 



4.66 m (15.3 ft) 



Inner causeway dock (gauge 6) 



12-sec, 3-m (9.8-ft) waves from 137 deg 



3.2 m (10.5 ft) 



Existing entrance (gauge 1 2) 



12- and 24-sec, 3-m (9.8-ft) waves from 182 deg 



1.65 m (5.4 ft) 



Existing channel (gauge 1 1) 



24-sec, 3-m (9.8-ft) waves from 182 deg 



0.98 m (3.2 ft) 



Existing turning basin (gauge 10) 



2- and 3-m (6.6- and 9.8-ft) waves from 182, 212, 



and 227 deg 



0.37 m (1.2 ft) 



For the +4.0-m (+13.0-ft)swl, maximum wave heights were as follows: 



'Refers to maximum significant wave heights throughout report. 



22 



Chapter 4 Experiments and Results 



