Y ( - Y, +1 = difference in distance from the baseline between two 

 consecutive surveys 



N s = number of years between consecutive surveys 

 Standard deviations were calculated and are an indication of relative variance 

 among shoreline positions at each transect. Maximum shoreline change repre- 

 sents the difference between the most landward and seaward shoreline position, 

 regardless of date. It thus defines the envelope of change for the shoreline 

 over the range of data. Shoreline change statistics produced by this analysis 

 are based on specific shoreline positions at distinct points in time. It is 

 important to note that no attempt is made to identify or represent changes 

 that may have occurred during the interval between successive surveys. The 

 analysis simply distributes these changes uniformly over the entire period. 



66. The length of coastal region investigated in this study (336 km) 

 required that data presentation be subdivided into discrete reaches that could 

 be plotted on report size paper at a reasonable scale. A total of seven 

 reaches were defined based on a combination of natural morphology and politi- 

 cal boundaries (Figure 21) . Continuous plots of mean change in shoreline 

 position, standard deviation, and maximum shoreline change are included here 

 for each reach of coastline. Continuous plots of temporal divisions of aver- 

 age shoreline change are also presented for each reach. These plots were pro- 

 duced by FORTRAN computer programs generated with the aid of Display 

 Integrated Software System and Plotting Package (DISSPLA) , a proprietary prod- 

 uct of Integrated Software Systems Corporation. Calculated quantities are 

 graphed versus actual alongshore distance. Some alongshore distortion is 

 introduced when individual segments of varying orientations are projected onto 

 the nonparallel axis of the graph. 



67. Summary tables list average shoreline movements for each possible 

 time interval, for various geographic locations. The numbers displayed are 

 averages obtained by summing interval shoreline position changes for each 

 transect within boundaries of the geographic location and dividing by the 

 total number of transects. The numbers in parentheses indicate the percentage 

 of shoreline for which data were available during the particular period. 



68. Information derived for each segment of each base map was compared 

 with environmental data obtained for each segment to investigate the possible 

 causes of measured shoreline changes. Data were compared for each of the 

 seven coastal reaches and the entire shoreline with the use of LOTUS 1-2-3 



51 



