Beach topography and nearshore bathymetry of the Columbia River littoral cell, Washington and Oregon, 2020
Dates
Publication Date
2021-12-01
Citation
Stevens, A.W., Weiner, H.M., Wood, J.M., Ruggiero, P., Kaminsky, G.M., and Gelfenbaum G.R., 2019, Beach topography and nearshore bathymetry of the Columbia River littoral cell, Washington and Oregon (ver. 4.0, January 2024): U.S. Geological Survey data release, https://doi.org/10.5066/P9W15JX8.
Summary
This USGS data release presents data collected during surveys of nearshore bathymetry and beach topography from the Columbia River littoral cell, Washington and Oregon. Survey operations were conducted between July 19 and September 6, 2020 (USGS Field Activity Number 2021-622-FA) by a team of scientists from the U.S. Geological Survey Pacific Coastal and Marine Science Center, Washington State Department of Ecology, and Oregon State University. Nearshore bathymetry data were collected using four personal watercraft (PWCs), each equipped with single-beam echosounders and survey-grade global navigation satellite systems (GNSS). Topography data were collected by walking along survey lines with GNSS receivers mounted on backpacks. Additional [...]
Summary
This USGS data release presents data collected during surveys of nearshore bathymetry and beach topography from the Columbia River littoral cell, Washington and Oregon. Survey operations were conducted between July 19 and September 6, 2020 (USGS Field Activity Number 2021-622-FA) by a team of scientists from the U.S. Geological Survey Pacific Coastal and Marine Science Center, Washington State Department of Ecology, and Oregon State University.
Nearshore bathymetry data were collected using four personal watercraft (PWCs), each equipped with single-beam echosounders and survey-grade global navigation satellite systems (GNSS). Topography data were collected by walking along survey lines with GNSS receivers mounted on backpacks. Additional topographic data were collected between survey lines in some areas with an all-terrain vehicle (ATV) equipped with a GNSS receiver to constrain the elevations and alongshore extent of major morphological features. Positions of the survey platforms were referenced to a GNSS base station placed on a nearby benchmark with known horizontal and vertical coordinates. Depths from the echosounders were computed using sound velocity profiles measured with a conductivity-temperature-depth (CTD) sensor during the survey. Figure 1 shows the locations of bathymetric- and topographic-survey lines, sound velocity profile measurements, and GNSS base stations used for geodetic control during the survey.
Due to equipment and staffing issues associated with the global pandemic, bathymetric surveys performed at the southern portion of the Clatsop Plains sub-cell (lines 71 to 101) and North Beach sub-cell took place several weeks after the corresponding topographic surveys. The CTD was not available for bathymetric surveys at these locations and an assumed speed of sound of 1500 and 1490 m/s was applied to soundings collected in the North Beach sub-cell and southern portion of the Clatsop sub-cell, respectively.
Digital files containing the nearshore bathymetry and beach topography data from this survey are available for download from the Child Items section below. Figure 1. Maps showing locations of bathymetric- and topographic-survey lines (blue and red lines, respectively), sound-velocity measurements derived from sound velocity casts, and benchmarks used for geodetic control from 2020 surveys along Columbia River littoral cell; left and right panels show data coverage for northern and southern parts of study area, respectively. Abbreviations: CR, Columbia River; GH, Grays Harbor; km, kilometer(s).
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Purpose
Data were obtained to document interannual changes in shoreline position and coastal morphology. These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to identify topographic and shallow-water bathymetric features.