Sediment tracer movement for Plan 19 also was similar to that obtained for existing 

 conditions, but sediment moved east of the new breakwater as opposed to east of the 

 existing causeway. The new breakwater configuration should have minimal impacts 

 on current and sediment movement patterns in the immediate vicinity. 



The widened and deepened breach in the existing causeway and the 6.7-m-deep 

 (22-ft-deep) deposition basin of Plan 19 was very effective in trapping sediment for 

 waves from the predominate 227-deg direction, particularly for storm waves with 

 the higher swl's. Sediment moved through the breach and deposited in a clockwise 

 eddy in the deposition basin. 



Chapter 4 Experiments and Results 



35 



