shown the same general pattern of strong shoreline erosion along its northern 

 half and slight erosion to accretion along its southern half. The magnitudes 

 of erosion and accretion were at their maximums in the 1920 to 1965 period. 



98. Average net shoreline change rates for each barrier island or 

 beach, for every possible survey interval, are presented in Table 8. It is 

 interesting to note that accretion occurred on both sides of the Winyah Bay 

 jetties during the 1920 to 1965 period. Jetty construction was completed 

 about 1900. Typically, accretion occurs only on the updrift side, and erosion 

 occurs downdrift. Morris Island, downdrift of Charleston Harbor jetties, is 

 an ideal example of shoreline erosion caused by sediment starvation by jet- 

 ties. However, South Island showed an amazing rate of accretion even though 

 it is downdrift of the Winyah Bay jetties. A second interesting fact to con- 

 sider is that damming and diversion of the Santee River were completed by 



Table 8 



Average Shoreline Movement (metres/year) . Sandy 



Point to North Inlet. South Carolina 



Survey Dates 



Location 



Bull Harbor 

 [15/7 - 15/15] 



Anderson Creek - Venning Creek 

 [15/16 - 15/19] 



Venning Creek - Graham Creek 

 [15/20 - 16/2] 



Graham Creek - Harbor River 

 [16/16 - 16/20] 



Harbor river - Bull River 

 [16/16 - 16/20] 



Bull River - Five Fathom Creek 

 [16/21 - 16/26] 



1874- 



1875- 



1921- 



1934- 



1962- 



1934 



1921 



1934 



1962 



1983 





-0.1 



-0.8 



-0.5 



-0.5 





(100) 



(100) 



(100) 



(100) 





-2.2 



-2.3 



-1.9 



-0.4 





(83) 



(95) 



(98) 



(100) 





-0.5 



-0.5 



-0.4 



0.1 





(99) 



(99) 



(99) 



(95) 





0.4 



-0.6 



0.1 



-1.4 





(98) 



(98) 



(99) 



(98) 



-0.2 



0.2 



-0.8 



0.1 



-0.9 



(5) 



(95) 



(95) 



(100) 



(73) 





1.3 



1.3 



-0.2 



-0/1 





(97) 



(100) 



(98) 



(98) 



Note: Numbers in parentheses indicate percent shoreline surveyed during the 

 given time interval. Numbers in brackets indicate the maps and segments con- 

 tained in the data block; e.g., Bull River-Five Fathom Creek [16/21 - 16/26] 

 extends from map 16 segment 21 to map 16 to segment 26. 



86 



