REACH 4 



ACCRETING (3.9J5) 



ERODING (13.9%) 



STABLE (82.2%) 



Figure 38. Summary of shoreline 

 movement for coastal reach 4, 

 1874-1983 



96. Maximum movement is quite high along this entire shoreline (Fig- 

 ure 40). Over the 1857 to 1983 time range, the only location that has less 

 than a 100-m net change is central North Island. Movements over 1,300 m 

 occurred near Cape Romain, and throughout the reach, movement in excess of 

 500 m is common. 



97. Temporal separation of average shoreline movement data into three 

 periods reveals steady erosion south of Cape Romain Harbor (Figure 41) . Mur- 

 phys Island was predominantly accretional prior to the early 1920's, except 

 for the north end. From the early 1920 's to early 1960, it was mainly ero- 

 sional, except for the extreme southern end. During the most recent time 

 interval, it has become strongly accretional again, but with erosion dominat- 

 ing adjacent to inlets. Cedar Island has changed from modestly accretional to 

 erosional through time. South Island, south of the Winyah Bay jetties, was 

 mixed spatially between erosion and accretion prior to the 1920's. Between 

 1920 and 1965, it was very strongly accretional, reaching a maximum of 



48 m/year between 1926 and 1934. During the 1960 to 1983 time span, it was 

 erosional to the south and accretional along the north end. North Island has 



82 



