ACCRETING (14.6%) 



STABLE (30.5%) 



ERODING (54.975) 



Figure 26. Summary of shoreline movement for coastal 

 reach 1, 1852-1983 



accretion on the south. This accretion may be attributed to groins built in 

 this area to retard erosion. Otter Islands, which are partially sheltered in 

 St. Helena Sound, are variable but mainly accretional. Spatially, erosion 

 predominates over this reach during the total study time interval. 



82. A pattern of highest variability in the vicinity of inlets is evi- 

 dent in reach 2. Each place where standard deviation of shoreline movement 

 exceeds 5 m/year is in the immediate vicinity of inlets (Figure 27) . Central 

 portions of barrier islands, while still variable in long-term rate of ero- 

 sion, are steady in shoreline change compared with areas adjacent to inlets. 

 Variability of shoreline change is echoed in the maximum shoreline movement 

 (Figure 28), which shows several changes in excess of 1,000 m over duration of 

 the study. Only in the vicinity of inlets are shoreline changes found in 

 excess of 500 m. Along central portions of barriers, maximum change over 



130 years of record drops below 100 m in several areas. 



83. Temporal examination of average rates of shoreline change (Fig- 

 ure 29) demonstrates the effect of jetty construction at Charleston Harbor. 

 The jetties were completed around the turn of the century. The first period 



64 



