Coastline

Daufuskie Island

Daufuskie Island is located to the south of Hilton Head Island, between Calibogue Sound to the northeast and Mungen Creek to the southwest.  The entire island has been classified as an unstabilized inlet zone.  A renourishment project was constructed here in December 1998, and has performed very well over the past 9 years.  Long-term erosion rates on the island average -4 to -5 ft per year but go as high as -10 to -11 ft per year in places.  Beginning at the northeast end of the island in the Melrose Tract and moving southwest, erosion rates begin at -1 ft per year but quickly increase to -7 ft per year near the clubhouse, then reach a maximum of -11 ft per year along the southern end of the Melrose Tract and in the northern end of the Oakridge Tract.  There is a wooden bulkhead approximately 4,000 ft long in this area.

 

Table 1.  Beach profile data for Daufuskie Island.
Benchmark Profiles in
2007 Profiles in
2006 First Survey
Year Total
Profiles
1380 04/17 None 1988 21
1360 04/17 None 1988 25
1340 04/17 None 1988 22
1320 04/17 None 1988 25
1300 04/17 None 1988 23

At the southwest end of the Oakridge Tract the long-term erosion rate decreases to about -6 ft per year, and continues to decrease to about -4.5 ft per year through much of the Bloody Point tract.  At the southern end of the Bloody Point tract, at Bloody Point, the rate increases again to a maximum of approximately -8.5 ft per year.  This area is very dynamic; it experienced extreme short-term erosion during much of 2001 and 2002, and then became highly accretional in 2003.

There are a total of 12 monitoring stations on Daufuskie Island, with the earliest beach survey data collected in 1988.  Five of these 12 stations were surveyed most recently in October 2002, August 2005, and April 2007.  At station 1300, in the Oak Ridge tract just south of the bulkhead, the 2007 survey was the most recent since 2002. Since that time, the beach has eroded over 150 ft.  At station 1320, in the Melrose Tract about 1200 ft north of the southern end of the bulkhead, the beach has migrated landward approximately 75 ft with the loss of the primary berm.  At 1340, the other station along the bulkhead in the Melrose Tract, the upper beach has eroded back over 100 ft and dropped in elevation between five and eight ft since the 2002 survey.  North of the bulkhead the beach at station 1360 has eroded about 40 ft since 2002 and still shows a substantial beach renourishment sand berm.  At station 1380, located at the northeast end of the development, the renourishment sand has eroded over 90 ft since 2002, leaving a remnant berm which is still forty ft wide and over seven ft high.