Robert Thieler USGS Research Geologist. America’s Coastal Crisis coastal population and development are increasingly vulnerable to coastal hazards.

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Presentation transcript:

Robert Thieler USGS Research Geologist

America’s Coastal Crisis coastal population and development are increasingly vulnerable to coastal hazards

(modified after Bindoff, 2007; Rahmstorf, 2007) Past, Current and Projected Sea-level Rise

Time Scales of Coastal Change Short-term Variance (hours to decade) Storm impact/recovery Annual cycles El Niño Long-term Trend (decades to centuries) Sediment deficit or surplus Sea-level rise

Coastal Vulnerability to Sea-level Rise: A Preliminary National Assessment Vulnerability Ranking

Coastal Vulnerability Studies in the National Parks Study sites in the Contiguous U.S. Study sites in Hawaii, Alaska, and U.S. Territories Cape Cod NS Fire Island NS Gateway NRA Gulf Islands NS Cape Hatteras NS Cumberland Island NS Assateague Island NS Dry Tortugas NP Padre Island NS Channel Islands NP Golden Gate NRA Point Reyes NS Olympic NP Apostle Islands NL Indiana Dunes NL Sleeping Bear Dunes NL Kenai Fjord NP Glacier Bay NPP Kaloko-Honokohau NHP NP of American Samoa Virgin Islands NP War in the Pacific NHP

Assessments Help Managers Plan For Hazards Norwegian Memorial Cape Alava Sand Point

Eastern North Carolina Elevation source: 30-m DEMElevation source: 3-m lidar data Dark blue: Land ≤ 1 meter in elevation Light blue: Area of uncertainty associated with 1 meter elevation

Wetland Vertical Development Mineral sediment deposition Plant matter accumulation - soil (root production/decomposition) Compaction Shrink-Swell Coastal Wetlands Respond Dynamically to Environmental Change R. Carlson D. Cahoon

Mid-Atlantic Assessment of Potential Dynamic Coastal Responses to Sea-level Rise Bluff erosion Overwash Island Breaching Threshold Crossing (Gutierrez et al., 2007)

Cape Lookout Cape Hatteras Oregon Inlet (NASA photo) USGS North Carolina Coastal Geology Cooperative Program A regional, multi-collaborator effort to understand and predict coastal change and hazards

Coastal Erosion Hotspots and Geology are Related Paleo-Roanoke River Channel Passes Under Kitty Hawk Kitty Hawk Bay

USGS and Partner Science to Provide Decision Support