manner. This process continued until all available surveys for the map were 

 digitized. "Flags" were inserted where necessary to signal missing data. 

 When one map was completed, the entire data set was sorted by combining the 

 surveys of each particular segment for further analysis. 



64. This procedure is suitable for coastlines where temporal reorienta- 

 tion and erosion/accretion is directed predominantly onshore - offshore . How- 

 ever, these conditions are usually not met in the vicinity of inlets and 

 capes. Large aerial changes, abrupt reorientation of the shoreline, and pro- 

 nounced alongshore changes required special analysis for most inlets and capes 

 along this study area. Linear measurement of temporal alongshore changes and 

 digitization of aerial differences were made from paper composite maps. Use 

 of paper maps reduces precision of the measurements, and data presented here 

 have been rounded off accordingly. However, because the magnitude of changes 

 are large in these special areas relative to precision lost, the overall 

 trends suggested by the data are valid. 



65. FORTRAN programs to perform numerical analysis of digitized data 

 were written on a Digital Equipment Corporation VAX 11/750 computer. Shore- 

 line positions for each survey for each segment were compared at each 50-m 

 transect. Mean change in shoreline position between the earliest and latest 

 survey dates and interval changes in shoreline position between each survey 

 date were calculated as follows: 



_ S 1 - S n 



s = z (1) 



where 



S = average change in shoreline position 

 S 1 - S n = net shoreline change between earliest and last dates 

 N t = total number of years between earliest and last dates 



Y, - Y 1+1 

 S, = „ (2) 



where 



S, = interval change 



50 



