fathometer surveying techniques. The 1997 survey comes from the SHOALS 

 LJDAR program using airborne laser mapping techniques. Obviously, the data 

 density is significantly increased in the 1997 survey; however, the user can see 

 discernible and repeating patterns in each survey. Notably, the Old Pass entrance 

 channel to Destin Harbor and the Channel Bend within East Pass exhibit 

 consistent shoaling patterns over each survey. The 1990 survey also indicates 

 shoaling within the authorized channel as the channel passes across the ebb-tidal 

 shoal. Once problem areas are identified, they can be compared with the 

 examples given in the DMS-Manual. Further analyses should then follow the 

 techniques included in the DMS-Analytical Toolbox to determine the root cause 

 of the shoaling and to examine potential solutions. 



A particular area of concern to the East Pass project engineers is Norriego 

 Point, one of several sites serving for disposal of the dredged material taken from 

 the authorized channels. Norriego Point shelters Destin Harbor from offshore 

 waves that propagate through the jetties into East Pass. Sand historically erodes 

 from Norriego Point into the channels. To document the erosion of Norriego 

 Point, Figure 8 shows four shoreline surveys taken over a 30-month period. The 

 August 1995 shoreline shows conditions before the impact of Hurricane Opal. 

 The January 1996 survey shows conditions following emergency Post-Opal 

 dredging operations that placed sand on Norriego Point. The August 1996 

 survey shows some of the initial evolution of the shoreline position following 

 placement. Finally, the January 1998 survey shows that the shoreline again 

 approximated 1995 conditions. Chapters 3 and 4 investigate possible 

 contributions that the eroding Norriego Point may have to the shoaling in the 

 authorized channels. 



The East Pass case study confirmed the utility of the DMS-Data Manager by 

 providing a quick and simple means to identify problem-shoaling areas. As is 

 found throughout the remaining chapters, the Data Manager is also useful during 

 application of the remaining components of the DMS. Development continues 

 on many of the features identified above. A working beta version of the Data 

 Manager will be available for application to the Year 2 Case Study in Fiscal Year 

 1999. 



Chapter 2 DMS-Data Manager 21 



