A Coastal Hazards Data Base for the U.S. West Coast (1997) (NDP-043C)
V. M. Gornitz, T. W. Beaty, and R. C. Daniels (contributors)
This document describes the contents of a database that may be used to identify coastlines along the U.S. West Coast that are at risk to sea-level rise. This data base integrates point, line, and polygon data for the U.S. West Coast into 0.25 degree latitude by 0.25 degree longitude grid cells and into 1:2,000,000 digitized line segments that can be used by raster or vector geographic information systems (GIS) as well as by non-GIS data bases. Each coastal grid cell and line segment contains data variables from the following seven data sets: elevation, geology, geomorphology, sea-level trends, shoreline displacement (erosion/accretion), tidal ranges, and wave heights. One variable from each data set was classified according to its susceptibility to sea-level rise and/or erosion to form 7 relative risk variables. These risk variables range in value from 1 to 5 and may be used to calculate a Coastal Vulnerability Index (CVI). Algorithms used to calculate several CVIs are listed within this text. The data for these 29 variables (i.e., the 22 original variables and 7 risk variables) are available as:
- Gridded polygon data for the 22 original data variables. Data include elevation, geology, geomorphology, sea-level trends, shoreline displacement (erosion/accretion), tidal ranges, and wave heights;
- Gridded polygon data for the seven classified risk variables. The risk variables are classified versions of: mean coastal elevation, geology, geomorphology, local subsidence trend, mean shoreline displacement, maximum tidal range, and maximum significant wave height;
- 1:2,000,000 line segment data containing the 29 data variables (i.e., the 22 original data variables and the 7 classified risk variables);
- Supplemental point data for the stations used in calculating the sea- level trend and tidal-range data sets; and
- Supplemental line segment data containing a 1:2,000,000 digitized coastline of the U.S. West Coast.