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Sea-Floor Mapping and Benthic Habitat GIS for the Elwha River Delta Nearshore, Washington

May 16, 2008

From March 1531, 2005, more than 252 km (19.5 km2) of seafloor offshore of the Elwha River Delta in the central Strait of Juan de Fuca was mapped by the USGS Coastal and Marine Geology Program. The purpose of this nearshore mapping was to (1) obtain high resolution bathymetry and acoustic reflectance properties of the seabed, (2) examine and record geologic characteristics of the seafloor, and (3) construct maps of sea-floor geomorphology and habitat. Substrate distribution was characterized with video-supervised statistical classification of the sonar data. Substrate of the survey was dominated by mixed sand-gravel and sand. Numerous boulder reefs were observed west of the river mouth within Freshwater Bay, whereas the sea-floor immediately adjacent to the river mouth was dominated by sand.

Citation Information

Publication Year 2008
Title Sea-Floor Mapping and Benthic Habitat GIS for the Elwha River Delta Nearshore, Washington
DOI 10.3133/ds320
Authors Guy R. Cochrane, Jonathan A. Warrick, Yael Sagy, David Finlayson, Jodi Harney
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Data Series
Series Number 320
Index ID ds320
Record Source USGS Publications Warehouse
USGS Organization Western Coastal and Marine Geology