Table 12 

 Area Changes South of the Wlnyah Bay Jetties 



Dates 



1872/73-1925 



1925-1934 



1934-1962/63 



1962/63-1983 



1872/73-1983 



Area Difference 

 m 3 



+232,000 



-585,000 



+9,500,000 



+4,800,000 



+13,800,000 



Rate of Change 

 m 2 /year 



+4,700 



-49,000 



+327,000 



+227,000 



+124,000 



Reversal at this inlet, South Santee River Inlet, and others may be due to 

 local reversal in littoral drift around ebb- tidal deltas as described by Fitz- 

 Gerald, Hubbard, and Nummedal (1978). However, this mechanism does not 

 explain why drift reversals occur in the 1934 to 1962 time frame. In this 

 case, it appears ebb delta landward migration by 1983 extended the shoreline 

 seaward 300 m from its 1872 position. 



151. The north side of North Inlet extended approximately 120 m along- 

 shore from 1872 to 1925/26 to form a small spit. Also, a small island formed, 

 effectively creating two adjacent inlets. From 1925/26 to 1934 the spit 

 showed a net erosion of 300 m (232,000 m 2 ) followed by rapid southward accre- 

 tion of 1,900 m (1.3 x 10 6 m 2 ) by 1962. Spit growth protected the island from 

 direct wave attack and returned morphology to a single inlet. Spit length in 

 1983 was equal to its length in 1962; however, landward shoreline erosion and 

 island incorporation resulted in a 1.4 x 10 6 m 2 increase in area. Net change 

 between 1872 and 1983 north of the inlet was approximately 1,700 m of along- 

 shore growth and a 2.7 x 10 6 m 2 growth in area. 



152. Inlet width was over 1,000 m in 1872 decreasing to 850 m total for 

 two inlets that formed in 1925/26 through spit growth and island formation. 

 Island erosion and spit retreat widened the inlet to 1,250 m by 1934. The 

 1962 survey shows one inlet again approximately 975 m wide, narrowing to 730 m 

 wide in 1983 by spit accretion on the south side. 



Unnamed inlet (Map 22) 



153. A small, unnamed inlet lies between Debidue Beach and Pawleys 

 Island. The inlet's north side grew consistently southwest from 1872 to 



117 



