Andrew W. Stevens
Guy Gelfenbaum
Jamie MacMahan
Ad J.H.M. Reniers
Edwin P. Elias
Christopher R. Sherwood
Emily M. Carlson
2017
Water column acoustic backscatter data from the mouth of the Columbia River, Oregon and Washington, 2013
NetCDF files
data release
DOI:10.5066/F7NG4NS1
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/F7NG4NS1
https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba
Andrew W. Stevens
Guy Gelfenbaum
Jamie MacMahan
Ad J.H.M. Reniers
Edwin P. Elias
Christopher R. Sherwood
Emily M. Carlson
2017
Oceanographic measurements and hydrodynamic modeling of the mouth of the Columbia River, Oregon and Washington, 2013
data release
DOI:10.5066/F7NG4NS1
Pacific Coastal and Marine Science Center, Santa Cruz, CA
U.S. Geological Survey
https://doi.org/10.5066/F7NG4NS1
Spatial surveys of water column acoustic backscatter were performed between May 28 and June 2, 2013, in the mouth of the Columbia River, Oregon and Washington. These data were collected using a Biosonics DTX single-beam echosounder with 430 kHz transducer.
These water column acoustic backscatter data were collected as a part of a larger investigation into hydrodynamics in the mouth of the Columbia River, Oregon and Washington.
Information about the data collection field activities can be found at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=S0313WO
20130528
20130602
ground condition at time data were collected
None Planned
-124.029598
-123.987173
46.267905
46.238508
USGS Metadata Identifier
USGS:590b751ce4b0e541a0378cba
Data Categories for Marine Planning
Water Column Features
USGS Thesaurus
marine water quality
Marine Realms Information Bank (MRIB) keywords
physical oceanography
None
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Pacific Coastal and Marine Science Center
PCMSC
ISO 19115 Topic Category
Oceans
geoscientificInformation
Geographic Names Information System (GNIS)
Columbia River
Pacific County
Clatsop County
State of Washington
State of Oregon
none
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data.
Andrew W. Stevens
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Oceanographer
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060-5792
USA
831-460-7424
831-427-4748
astevens@usgs.gov
https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_biosonics_map.png&allowOpen=true
Map showing locations of survey transects
PNG
https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_biosonics_ex.png&allowOpen=true
Image showing water column backscatter data from one of the transects surveyed at three different stages of the tide cycle
PNG
Matlab version 9.0.0.341360 running on Microsoft Windows 7
International Hydrographic Organization (IHO)
2008
IHO standards for hydrographic surveys (5th ed.)
PDF
Monaco
International Hydrographic Bureau Special Publication 44, 28p.
https://www.iho.int/iho_pubs/standard/S-44_5E.pdf
No formal attribute accuracy tests were conducted.
Data fall within expected ranges.
Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the metadata for each part of this data release carefully for additional details.
Manufacturer reported accuracy for the differentially corrected horizontal positions for the Trimble R7 rover trajectories is 0.8 cm + 0.5 ppm. Baselines from the GNSS base station were typically less than 5 km, suggesting a horizontal accuracy of survey-vessel positions to be 0.825 cm.
Manufacturer reported accuracy for the differentially corrected vertical positions for the Trimble R7 rover trajectories is 1.5 cm + 1 ppm. Baselines from the GNSS base station were typically less than 5 km, suggesting the vertical accuracy of survey vessel positions to be 2 cm relative to the base station coordinate. Additional uncertainty in the final computed elevations data is related to unmeasured variability in the speed of sound used to compute depths from bathymetric soundings and, thus, are depth-dependent. Based on analysis of all available speed of sound measurements, we estimate uncertainties in the final depth soundings to be 1 percent of the water depth. The total vertical uncertainty is calculated using Equation 1: sigmat=sqrt(a^2+(b×d)^2), where sigmat is the total vertical uncertainty, a is the uncertainty of the GNSS vertical position, b is the depth-dependent uncertainty factor (0.01), and d is water depth (International Hydrographic Organization, 2008). Maximum water depths surveyed on this mapping mission are approximately 35 m yielding a maximum total vertical uncertainty of 37 cm. Uncertainty in the vertical positions associated with pitch and roll of the survey vessels is unknown.
A total of 62 km of tracklines were surveyed with a Biosonics single-beam echosounder in the mouth of the Columbia River (MCR) between May 28 and June 2, 2013. Several cross-channel transects were surveyed repeatedly to characterize changes in water column acoustic backscatter amplitude at different stages of the tide cycle. Measurements of acoustic backscatter amplitude in the water column were collected using a Biosonics single-beam echosounder with a 430 kHz transducer pole-mounted to the R/V Park Snavely. A Trimble R7 global navigation satellite system (GNSS) receiver and Trimble Zephyr Model 2 GNSS antenna was used to provide positioning during the surveys. Real-time differential corrections from the Washington State Reference Network (http://www.wsrn3.org/) were applied to achieve survey-grade horizontal and vertical GNSS positions while the vessel was underway. Biosonics Visual Acquisition software (version 6.1.0.7382) was used for data acquisition and merging of the acoustic and positioning data. Raw backscatter data from each ping were digitized with an analog to digital converter in the echosounder at a rate of 41667 Hz, resulting in a profile of acoustic backscatter counts versus depth at intervals of 1.8 cm. Raw counts of acoustic backscatter were converted to target strength assuming a seawater absorption coefficient of 0.085 dB/m, a source level of 216 dB re 1 microPa m, and receiver sensitivity of -61.4 dB/count derived from calibrations performed in a test tank by the manufacturer.
20130602
Data were accumulated into NetCDF files.
20160114
Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.
20201019
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Data were collected continuously along survey transects. Refer to self-contained NetCDF files for more location information.
0.000001
0.000001
Decimal degrees
D_WGS_1984
WGS_1984
6378137.0
298.257223563
NetCDF files are self-contained and attribute information may be found in the header of the file itself.
The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information.
U.S. Geological Survey - ScienceBase
Mailing and Physical Address
Denver Federal Center, Building 810, Mail Stop 302
Denver
CO
80225
USA
1-888-275-8747
sciencebase@usgs.gov
Downloadable data in NetCDF format. NetCDF were compressed in zip files (e.g. mcr13_XXXX..., where XXXX is the MMDD) for each day of survey operations.
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
NetCDF
Matlab 9.0.0.341360
Zip file contains vessel-mounted ADCP data in NetCDF format for data collected on May 29, 2013
zip archive
342.03
https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_0529_backscatter.zip
https://doi.org/10.5066/F7NG4NS1
Data may be accessed and downloaded via the Internet
NetCDF
Matlab 9.0.0.341360
Zip file contains vessel-mounted ADCP data in NetCDF format for data collected on June 2, 2013
zip archive
447.51
https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_0602_backscatter.zip
https://doi.org/10.5066/F7NG4NS1
Data may be accessed and downloaded via the Internet
NetCDF
Matlab 9.0.0.341360
Zip file contains vessel-mounted ADCP data in NetCDF format for data collected on May 28, 2013
zip archive
671.56
https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_0528_backscatter.zip
https://doi.org/10.5066/F7NG4NS1
Data may be accessed and downloaded via the Internet
NetCDF
Matlab 9.0.0.341360
Zip file contains vessel-mounted ADCP data in NetCDF format for data collected on May 31, 2013
zip archive
715.66
https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_0531_backscatter.zip
https://doi.org/10.5066/F7NG4NS1
Data may be accessed and downloaded via the Internet
NetCDF
Matlab 9.0.0.341360
Zip file contains vessel-mounted ADCP data in NetCDF format for data collected on June 1, 2013
zip archive
1480.0
https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_0601_backscatter.zip
https://doi.org/10.5066/F7NG4NS1
Data may be accessed and downloaded via the Internet
png
Matlab 9.0.0.341360
PNG image showing example of water column acoustic backscatter data at various stages throughout the tide cycle
none
1.59
https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_backscatter_ex.png
https://doi.org/10.5066/F7NG4NS1
Data may be accessed and downloaded via the Internet
png
Matlab 9.0.0.341360
PNG image showing locations of water column acoustic backscatter data
none
1.88
https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_backscatter_map.png
https://doi.org/10.5066/F7NG4NS1
Data may be accessed and downloaded via the Internet
None
20201019
Andrew W. Stevens
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Oceanographer
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
USA
831-460-7424
831-427-4748
astevens@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998