model showed the effects of Plan 1 to be mainly local and caused by sand- 

 tightening of the south jetty. Tidal velocities at the end of the jetties and 

 at Tide Gage 1 near the south jetty increased by approximately 10 percent. 

 There were no significant changes in velocities at the throat of the inlet. 

 The extension of the navigation channel at the seaward end produced almost no 

 effect upon the tidal current patterns. 



The results of the sediment transport model indicated an increase in 

 both deposition rates and erosion rates from base to Plan 1 for the channel 

 reach between sta -97+76 to sta 325+00. Model results for the reach between 

 sta 325+00 and sta 399+74 for base and Plan 1 were suspect since quantitative 

 field information on sedimentation was not available for this reach, the 

 bathjnnetry used in Model B was not the latest, and the grain size of the sedi- 

 ment observed in this reach was much larger than that of the sediment every- 

 where else in the study area. For the channel reach between sta -80+00 and 

 sta 325+00, the shoaling volume for Plan 1 was estimated from Model B results 

 to be approximately 788,000 cu yd/year or an increase of approximately 66 per- 

 cent from base. Finally, based on Model B results for Plan 1 and all other 

 available information, recommendations on advance maintenance dredging were 

 made for various reaches of the channel for use in channel design. Based on 

 modeling limitations, the accuracy of Model B sediment transport results is 

 estimated to be within ±25 percent. 



