Nourishment, Groins, Seawalls, Breakwaters, Jetties.

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Presentation transcript:

Nourishment, Groins, Seawalls, Breakwaters, Jetties.

Beach Erosion (Right) Beach on the North end of Folly has disappeared (Below) Beach Erosion at 7th (left) and by 65th (right) on IOP

Isle of Palms nourishment Last completed in 2008 Take 3 months Currently planning another Renourish 30% of sand was lost in the first 2 years Before (top) and After (bottom) (Below) Nourishment zones

Folly Beach nourishment Last completed in 2014 Take 6 months Cost $30 mil this last time Done every 8 years

Folly Groins Groins on Folly Beach (48 total) (Left) End groin on the far north part of the beach. (Above) Groin in the middle of the beach. Notice the difference in the above picture on left and right side. (Which direction is the Longshore current?)

FOLLY Groins (Right) Satellite imagery of the groins in the north portion of Folly Beach. (Below) 750 ft long Terminal Groin in the south portion of Folly Beach County Park

Seawalls Seawalls BEFORE and AFTER Installing a seawall will save houses, but destroys the beach long term. Biodiversity is decimated as a result.

Seawalls The Battery Wall first built around 1730. Early 1900s, “The Turn” was built to connect High and Low Battery Rebuilding has happened many times (Above) Restoring The Turn in 2013

Seawalls 1+ mile long seawall in Georgetown County (Above) Illegal Seawall at Wild Dunes on IOP (Below) Seawalls were temporarily allowed in 2014 by SC for a study. As of 7.28.2016 they must all be removed.

Breakwater Charleston Harbor Marina is surrounded by breakwaters to slow impending waves

Charleston Harbor Jetties Built in 1880s 3 miles long, 0.5 miles wide Purpose: Dredged to 18 feet at low water to allow deep, long channel for shipping entering Harbor Before jetties, channel was 11 feet deep Effect: Interrupt longshore current and transport of sand to the south, depleting Folly and Morris Islands Morris Island Lighthouse

Charleston Harbor Jetties

Morris Island Lighthouse Built in 1876 – stood 0.5 miles from edge of water 1938 – Lighthouse was on the edge of the water Currently it is 0.35 miles off shore (Top Right) 1938 w/ housing complex (Bottom right) Current high tide (Bottom left) Current low tide

SC Beach Management Policies South Carolina state law states that no new erosion control structures or devices are allowed seaward of the sand dune crest. Shoreline structures are allowed the protect a public highway that was built before this law went into effect in 2002. Current shoreline structures cannot be enlarged or rebuilt, the structures must be maintained. In 2014, a bill was passed that allowed the Debordieu (Georgetown County) seawall get rebuilt and extended from 400 ft to 1.5 miles. This opens up possible gray areas for other groups attempting to build their own seawalls, to the detriment of the beach Folly Beach is EXEMPT from such rules.