5 Conclusions 



Based on results of the coastal model investigation reported herein, it is con- 

 cluded that: 



a. Existing conditions are characterized by rough and turbulent wave condi- 

 tions in the existing entrance. Very confused wave patterns were observed 

 in the entrance due to reflected wave energy off the vertical walls lining the 

 entrance. Wave heights in excess of 1 .5 m (5 ft) were obtained in the 

 entrance for typical storm conditions; and wave heights of almost 3.7 m 



■ (12 ft) were obtained in the entrance for 50-year storm wave conditions 

 with extreme high water levels (+4 m (+13 ft)). 



b. Wave conditions along the vertical-faced causeway docks were excessive 

 for existing conditions. Wave heights in excess of 3.7 and 2.7 m (12 and 



9 ft) were obtained along the outer and inner docks, respectively, for typical 

 storm conditions; and wave heights of almost 7.0 and 5.8 m (23 and 19 ft) 

 were recorded along these docks, respectively, for 50-year storm wave 

 conditions with extreme highwater levels. 



c. Preliminary experiments provided an excellent means to expeditiously 

 evaluate various improvement plans (Plans 1-18) with respect to wave 

 heights, wave-induced current patterns and magnitudes, and sediment tracer 

 patterns and subsequent deposits. These experimental results were used as 

 a basis for development of the final improvement plan (Plan 19). 



d. The final improvement plan (Plan 1 9) will result in calm conditions (wave 

 heights of 0. 15 m (0.5 ft) or less) in the existing harbor during typical storm 

 conditions. For 50-year storm conditions with extreme highwater levels, 

 wave heights will not exceed 0.52 m (1.7 ft) in the harbor. 



e. Wave heights at the causeway docks, particularly the inner dock, will be 

 significantly reduced as a result of the Plan 19 breakwater configuration 

 during both typical and extreme (50-year) storm wave events. 



36 Chapter 5 Conclusions 



