1. Coastal and Marine Hazards and Resources
  2. Geoscience Data System
  3. Dataset 40978

Dataset description: Digital elevation models (DEMs) of the Elwha River delta, Washington, April 2014

This part of the data release presents a digital elevation model (DEM) derived from bathymetry and topography data of the Elwha River delta collected in April 2014. Two dams on the Elwha River, Washington State, USA trapped over 20 million m3 of sediment, reducing downstream sediment fluxes and contributing to erosion of the river's coastal delta. The removal of the Elwha and Glines Canyon dams between 2011 and 2014 induced massive increases in river sediment supply and provided an unprecedented opportunity to examine the response of a delta system to changes in sediment supply. The U.S. Geological Survey developed an integrated research program aimed at understanding the ecosystem responses following dam removal that included regular monitoring of coastal and nearshore bathymetry and topography. As part of this monitoring program, the USGS conducted a bathymetric and topographic survey in the Strait of Juan de Fuca on the Elwha River delta, Washington (USGS Field Activity Number 2014-620-FA). Bathymetry data were collected using two personal watercraft (PWCs), each equipped with single-beam echosounders and survey-grade global navigation satellite system (GNSS) receivers. Topography data were collected on foot with GNSS receivers mounted on backpacks. DEM surfaces were produced from all available elevation data using linear interpolation.
Version1
Keywordstopography, digital elevation models, GPS measurement, bathymetry, bathymetry measurement
Data typesProfiles, Transects
FormatASCII
Amount3.4 MB

Contacts

Contact
Andrew Stevens
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Location of materials and files

Public files
Metadatahttps://cmgds.marine.usgs.gov/metadata/pcmsc/DataReleases/ScienceBase/DR_F76T0JSP/ew14_apr_dem.xml
Outline - Questions and answers - Text - XML

Activities and equipment

ActivityEquipment
2014-620-FATrimble R7 GPS (AS)
Andrew Stevens submitted; no serial numbers yet