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U.S. Geological Survey Open-File Report 2010-1146

Coastal Vulnerability Assessment of the Northern Gulf of Mexico to Sea-Level Rise and Coastal Change

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Table 2. Ranges for vulnerability ranking of variables along the Northern Gulf of Mexico Coast.
   Variables Very Low
1		 Low
2		 Moderate
3		 High
4 		Very High
5
Geomorphology Rocky cliffed coasts, fjords Medium cliffs, indented coasts Low cliffs, glacial drift, alluvial plains Cobble beaches, estuary, lagoon Barrier beaches, sand beaches, salt marsh, mud flats, deltas, mangrove, coral reefs
Shoreline erosion/accretion (meters per year) > 2.0 1.0 - 2.0
 -1.0 - 1.0
 -2.0 - -1.0
< -2.0
Land-area change (square meters per square kilometer per year) > 1000 0 - 1000 -1000 - -1 -2000-1001 < -2000
Coastal slope (percent) > 1.20 1.20 - 0.90
 0.90 - 0.60
 0.60 - 0.30
< 0.30
Relative sea-level change (millimeters per year ) < 1.8
 1.8 - 2.5
 2.5 - 3.0
 3.0 - 3.4
> 3.4
Vertical movement (millimeters per year) < 1.1 1.1 - 2.4 2.5 - 3.9 4.0 - 5.0 > 5.0
Mean significant wave height (meters) < 0.55 0.55 - 0.85 0.85 - 1.05 1.05 - 1.25
> 1.25
Mean tidal range (meters) > 6.0
4.0 - 6.0 2.0 - 3.99 1.0 - 1.99
<0.99

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