Oceanographic measurements obtained offshore of the Elwha River delta in coordination with the Elwha River Restoration Project, Washington, USA, 2010-2014

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Frequently anticipated questions:

What does this data set describe?

Oceanographic measurements obtained offshore of the Elwha River delta in coordination with the Elwha River Restoration Project, Washington, USA, 2010-2014
Time-series data of velocity, pressure, turbidity, conductivity, and temperature were collected near the mouth of the Elwha River, Washington, USA, from December 2010 through October 2014, for the Department of Interior’s Elwha River Restoration project. As part of this project, the U.S. Geological Survey studied the effects of renewed sediment supplies on the coastal ecosystems before, during, and following the removal of two dams, Elwha and Glines Canyon, from the Elwha River. Removal of the dams reintroduced sediment stored in the reservoirs to the river, and the river moved much of this sediment to the coast.
Several benthic tripods were instrumented with oceanographic sensors to collect the time-series data. Initial deployment in December 2010 consisted of one tripod about 1 km east of the Elwha River mouth (Tripod A). In March of 2011, an identical tripod (Tripod B) was placed about 1 km west of the river mouth. A mooring was added to the western site in July 2012 to measure turbidity and conductivity near the surface.  A third tripod was placed in deeper water (50 m) directly offshore of the river mouth in an attempt to characterize sediment gravity flows near the seafloor if they occurred (Tripod C). Exceptional sedimentation was observed near the original tripod site A during the winter of 2013-2014. As a result, the tripod was relocated further east in April 2013 and renamed Tripod D.
Please check metadata and instrument information carefully for applicable time periods of specific data, as individual instrument deployment times and duration of the time series vary.
The naming convention for the NetCDF files included in this release is a 12-character alphanumeric code (ELWYYJKLNNXX.nc) where:
ELW is a 3-digit alphabetic-code for this experiment located at the mouth of the Elwha River YY is the 2-digit year at the time of deployment J is the location with respect to the river mouth [A, East (December 2010 to April 2013); B, West; C, Offshore; D, East (April 2013 to March 2014)] K is the deployment number (1-9; beginning and ending dates of each deployment are given below) L is the instrument package type (T, tripod; M, surface mooring) NN indicates the position of instrument on the surface mooring (01, nearest the surface; NN increases with depth) XX denotes the instrument or data type (wh, RDInstruments ADCP current data; wv, RDInstruments ADCP derived wave parameters; nx, Falmouth Scientific NXIC CTD; aq, Aquatec Aqualogger OBS; bl, RBR, Ltd CTD; sc, SeaBird Electonics SBE16+ CT)
Some derived parameters are included in these data.
Deployment dates: 1. Dec 2010 to Mar 2011 2. Mar 2011 to Sep 2011 3. Sep 2011 to Mar 2012 4. Mar 2012 to Aug 2012 5. Aug 2012 to Jan 2013 6. Jan 2013 to Jun 2013 7. Jun 2013 to Dec 2013 8. Dec 2013 to Mar 2014 9. Mar 2014 to Oct 2014
  1. How might this data set be cited?
    Ferreira, Joanne C.T., and Warrick, Jonathan, 2017, Oceanographic measurements obtained offshore of the Elwha River delta in coordination with the Elwha River Restoration Project, Washington, USA, 2010-2014: data release DOI:10.5066/F7CR5RW8, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -123.585
    East_Bounding_Coordinate: -123.545
    North_Bounding_Coordinate: 48.17
    South_Bounding_Coordinate: 48.13
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/57b7901de4b03fd6b7d95822?name=ElwhaInstrumentLocations.jpg&allowOpen=true (JPEG)
    map showing locations of instrument packages
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 15-Dec-2010
    Ending_Date: 15-Oct-2014
    ground condition at time data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: NetCDF files
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (5)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.001. Longitudes are given to the nearest 0.001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    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.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Joanne C.T. Ferreira
    • Jonathan Warrick
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Joanne C.T. Ferreira
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission Street
    Santa Cruz, CA

    831-460-7571 (voice)
    831-427-4748 (FAX)

Why was the data set created?

The U.S. Geological Survey collected oceanographic measurements during 2010 to 2014 of the waves, currents and turbidity conditions near the Elwha River mouth to help better understand the effects of the renewed sediment supplies on the coastal ecosystems.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 24-May-2016 (process 1 of 4)
    Oceanographic instruments were deployed offshore of the Elwha River in the Puget Sound to collect time-series data. Instruments included in deployment are: RDI Workhorse Monitor Wave and Current Gauge, RBR Global XR-420 and Logger 2 data loggers, RDInstruments Citadel CTD (NXIC), and Aquatec Aqualoggers.
    Date: 12-Mar-2017 (process 2 of 4)
    Data were processed using the instrument manufacturer's software packages. Data were accumulated into NetCDF files. During post-processing, data collected when instruments were not in place were removed from the time series. Bad data points were identified by 1) the deployment and recovery times, 2) pressure readings less than the deployed water depth, 3) amplitude or correlation values outside of predetermined quality thresholds for the ADCP, 4) changes in heading and tilt measurements of the ADCP compass. Data near the surface with variable side lobe interference has been retained.
    Date: 07-Dec-2017 (process 3 of 4)
    Data from Aquatec Aqualoggers was revised to include pressure data.
    Date: 19-Oct-2020 (process 4 of 4)
    Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    No formal attribute accuracy tests were conducted.
  2. How accurate are the geographic locations?
    A formal accuracy assessment of the horizontal positional information in the data set has either not been conducted, or is not applicable.
  3. How accurate are the heights or depths?
    A formal accuracy assessment of the vertical positional information in the data set has either not been conducted, or is not applicable.
  4. Where are the gaps in the data? What is missing?
    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.
  5. How consistent are the relationships among the observations, including topology?
    Data fall within expected ranges.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: 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.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
  2. What's the catalog number I need to order this data set? Downloadable time-series data in NetCDF format. NetCDF files are grouped into four (4) different zip files, one zip file per instrument package location and type. See the abstract section for the naming convention of the individual files included in each zip.
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 08-Nov-2021
Metadata author:
Joanne C.T. Ferreira
U.S. Geological Survey, Pacific Coastal and Marine Science Center
2885 Mission Street
Santa Cruz, CA

831-460-7571 (voice)
831-427-4748 (FAX)
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_F7CR5RW8/elwha_metadata_v1.1.faq.html>
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