Barrier Islands are Geologically Temporary. Chandeleur Islands Before (above) and after (below) Hurricane Katrina.

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Presentation transcript:

Barrier Islands are Geologically Temporary

Chandeleur Islands Before (above) and after (below) Hurricane Katrina

10) Sea Cliff Erosion Headlands erode from wave action Creates caves, arches, sea stacks

Sea Cave

Arches

Sea Stacks

Sea Cliff Erosion

Coastal Erosion

1) Hurricanes and Coastal Erosion

Ivan: 2004 Dennis: 2005

Charley: 2004

Rita: 2005

Ivan: 2004

Katrina: 2005

Sea Cliff Erosion

Coastal erosion rates:Cape Cod, Massachusetts Average 0.5 ft/yr, 50 ft/century Not constant 15 feet in 5 years, then stable for 40 yrs Leads to false sense of security Erosion is episodic, not gradual

Local Erosion Rates Vary Depends on geology Storm frequency Louisiana: Several meters/year Rocky coasts: a few cm/yr Erosion is episodic, not gradual

Factors Leading to Erosion Depends on geology Storm frequency Wave height Tidal range Sea-level changes

Preventing Beach Erosion Structural: Sea walls and groins Non-structural: adding sand, land-use planning

Preventing Beach Erosion