Surface-sediment grain-size distributions of the Elwha River delta, Washington, February 2016

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What does this data set describe?

Title:
Surface-sediment grain-size distributions of the Elwha River delta, Washington, February 2016
Abstract:
This portion of the data release presents sediment grain-size data from samples collected on the Elwha River delta, Washington, in February 2016. Surface sediment was collected from 83 locations using a small ponar, or 'grab' sampler from the R/V Frontier in water depths between 17 and 1 m around the delta. An additional 18 samples were collected by hand at low tide. A handheld global satellite navigation system (GNSS) receiver was used to determine the locations of sediment samples. The grain size distributions of suitable samples were determined using standard techniques developed by the USGS Pacific Coastal and Marine Science Center sediment lab. Grab samples that yielded less than 50 g of sediment were omitted from analysis and are classified as "no sample". The grain-size data are provided in a comma-delimited spreadsheet (.csv).
Supplemental_Information:
Additional information about the field activities from which these data were derived are available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=2016-608-FA
  1. How might this data set be cited?
    Stevens, Andrew W., Gelfenbaum, Guy, Warrick, Jonathan A., Miller, Ian M., and Weiner, Heather M., 2016, Surface-sediment grain-size distributions of the Elwha River delta, Washington, February 2016: data release DOI:10.5066/F7ZK5DTS, U.S. Geological Survey, Santa Cruz, CA.

    Online Links:

    This is part of the following larger work.

    Stevens, Andrew W., Gelfenbaum, Guy, Warrick, Jonathan A., Miller, Ian M., and Weiner, Heather M., 2016, Bathymetry, topography, and sediment grain-size data from the Elwha River delta, Washington, February 2016: data release DOI:10.5066/F7ZK5DTS, U.S. Geological Survey, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -123.5846
    East_Bounding_Coordinate: -123.473
    North_Bounding_Coordinate: 48.1543
    South_Bounding_Coordinate: 48.1328
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 16-Feb-2016
    Ending_Date: 18-Feb-2016
    Currentness_Reference:
    ground condition at time the samples were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: comma-delimited spreadsheet (.csv file)
  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.
    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 1.0E-6. Longitudes are given to the nearest 1.0E-6. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is WGS1984.
      The ellipsoid used is WGS1984.
      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?
    Attribute Table
    Table containing attribute information associated with the data set (Source: Producer defined)
    FACS/FAN I.D.
    Unique U.S. Geological Survey field activity identifier (Source: producer defined) Unique identifier for the U.S. Geological Survey field activity
    Sample ID
    Name of sample (Source: producer defined) Unique identifier for the sample used given in the field
    Sample Recovered
    Flag to indicate whether sample was recovered (Source: producer defined)
    ValueDefinition
    YesSample collection successful at site, sample collected
    NoSample collection unsuccessful, no sample recovered
    Date Collected
    Date of sample collection in mm/dd/yyyy format (Source: producer defined)
    Range of values
    Minimum:2/16/2016
    Maximum:2/18/2016
    Units:Dates in mm/dd/yyyy format
    Time (GMT)
    Time of sample collection in HH:MM:SS format relative to Grenwich Mean Time (GMT) (Source: producer defined)
    Range of values
    Minimum:00:00:00
    Maximum:23:59:59
    Units:Times in HH:MM:SS format
    Latitude (deg. N)
    Latitude of sample in decimal degrees, north (Source: producer defined)
    Range of values
    Minimum:48.13282
    Maximum:48.15430
    Units:decimal degrees
    Longitude (deg. E)
    Longitude of sample in decimal degrees, east (Source: producer defined)
    Range of values
    Minimum:-123.58458
    Maximum:-123.47305
    Units:decimal degrees
    Sample Type
    Type of sample collected (Source: Produce defined)
    ValueDefinition
    SurfaceSample collected on land by hand
    GrabSample collected with grab sampler from boat
    Lab ID
    Name of sample identifier in YY-FFFFF-XX format, where YY is the 2-digit year (for example 16=2016, 99=1999), FFFFF is the 5-digit field-activity-number (FAN) ID code, and XX is a sequential number given to the sample in the lab. NA=not applicable, because no sample was recovered. (Source: Producer defined) Unique identifier for the sample given during analysis in the lab
    Wt. percent in -2.00 phi bin
    Weight percent of sample with grain diameter greater than -2.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in -1.00 phi bin
    Weight percent of sample with grain diameter between -2.00 and -1.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in -0.75 phi bin
    Weight percent of sample with grain diameter between -1.00 and -0.75 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in -0.50 phi bin
    Weight percent of sample with grain diameter between -0.75 and -0.50 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in -0.25 phi bin
    Weight percent of sample with grain diameter between -0.50 and -0.25 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 0.00 phi bin
    Weight percent of sample with grain diameter between -0.25 and 0.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 0.25 phi bin
    Weight percent of sample with grain diameter between 0.00 and 0.25 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 0.50 phi bin
    Weight percent of sample with grain diameter between 0.25 and 0.50 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 0.75 phi bin
    Weight percent of sample with grain diameter between 0.50 and 0.75 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 1.00 phi bin
    Weight percent of sample with grain diameter between 0.75 and 1.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 1.25 phi bin
    Weight percent of sample with grain diameter between 1.00 and 1.25 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 1.50 phi bin
    Weight percent of sample with grain diameter between 1.25 and 1.50 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 1.75 phi bin
    Weight percent of sample with grain diameter between 1.50 and 1.75 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 2.00 phi bin
    Weight percent of sample with grain diameter between 1.75 and 2.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 2.25 phi bin
    Weight percent of sample with grain diameter between 2.00 and 2.25 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 2.50 phi bin
    Weight percent of sample with grain diameter between 2.25 and 2.50 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 2.75 phi bin
    Weight percent of sample with grain diameter between 2.50 and 2.75 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 3.00 phi bin
    Weight percent of sample with grain diameter between 2.75 and 3.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 3.25 phi bin
    Weight percent of sample with grain diameter between 3.00 and 3.25 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 3.50 phi bin
    Weight percent of sample with grain diameter between 3.25 and 3.50 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 3.75 phi bin
    Weight percent of sample with grain diameter between 3.50 and 3.75 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 4.00 phi bin
    Weight percent of sample with grain diameter between 3.75 and 4.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 4.25 phi bin
    Weight percent of sample with grain diameter between 4.00 and 4.25 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 4.50 phi bin
    Weight percent of sample with grain diameter between 4.25 and 4.50 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 4.75 phi bin
    Weight percent of sample with grain diameter between 4.50 and 4.75 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 5.00 phi bin
    Weight percent of sample with grain diameter between 4.75 and 5.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 5.25 phi bin
    Weight percent of sample with grain diameter between 5.00 and 5.25 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 5.50 phi bin
    Weight percent of sample with grain diameter between 5.25 and 5.50 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 5.75 phi bin
    Weight percent of sample with grain diameter between 5.50 and 5.75 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 6.00 phi bin
    Weight percent of sample with grain diameter between 5.75 and 6.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 6.25 phi bin
    Weight percent of sample with grain diameter between 6.00 and 6.25 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 6.50 phi bin
    Weight percent of sample with grain diameter between 6.25 and 6.50 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 6.75 phi bin
    Weight percent of sample with grain diameter between 6.50 and 6.75 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 7.00 phi bin
    Weight percent of sample with grain diameter between 6.75 and 7.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 7.25 phi bin
    Weight percent of sample with grain diameter between 7.00 and 7.25 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 7.50 phi bin
    Weight percent of sample with grain diameter between 7.25 and 7.50 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 7.75 phi bin
    Weight percent of sample with grain diameter between 7.50 and 7.75 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 8.00 phi bin
    Weight percent of sample with grain diameter between 7.75 and 8.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 8.25 phi bin
    Weight percent of sample with grain diameter between 8.00 and 8.25 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 8.50 phi bin
    Weight percent of sample with grain diameter between 8.25 and 8.50 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 8.75 phi bin
    Weight percent of sample with grain diameter between 8.50 and 8.75 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 9.00 phi bin
    Weight percent of sample with grain diameter between 8.75 and 9.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 9.25 phi bin
    Weight percent of sample with grain diameter between 9.00 and 9.25 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 9.50 phi bin
    Weight percent of sample with grain diameter between 9.25 and 9.50 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 9.75 phi bin
    Weight percent of sample with grain diameter between 9.50 and 9.75 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 10.00 phi bin
    Weight percent of sample with grain diameter between 9.75 and 10.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 10.25 phi bin
    Weight percent of sample with grain diameter between 10.00 and 10.25 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 10.50 phi bin
    Weight percent of sample with grain diameter between 10.25 and 10.50 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 10.75 phi bin
    Weight percent of sample with grain diameter between 10.50 and 10.75 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 11.00 phi bin
    Weight percent of sample with grain diameter between 10.75 and 11.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 11.25 phi bin
    Weight percent of sample with grain diameter between 11.00 and 11.25 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 11.50 phi bin
    Weight percent of sample with grain diameter between 11.25 and 11.50 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 12.00 phi bin
    Weight percent of sample with grain diameter between 11.50 and 12.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Wt. percent in 13.00 phi bin
    Weight percent of sample with grain diameter between 12.00 and 13.00 phi. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Percent Gravel
    percent of sample greater than 2 mm. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Percent Sand
    percent of sample less than 2 mm and greater than 63 microns. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Percent Silt
    percent of sample less than 63 microns and greater than 4 microns. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Percent Clay
    percent of sample less than 4 microns. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    Percent Mud
    percent of sample less than 63 microns. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percentage
    D5 Phi
    Phi size at D5 for sample. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-2
    Maximum:13
    Units:Phi size
    D10 Phi
    Phi size at D10 for sample. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-2
    Maximum:13
    Units:Phi size
    D16 Phi
    Phi size at D16 for sample. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-2
    Maximum:13
    Units:Phi size
    D25 Phi
    Phi size at D25 for sample. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-2
    Maximum:13
    Units:Phi size
    D50 Phi
    Phi size at D50, or average particle diameter by mass, for sample. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-2
    Maximum:13
    Units:Phi size
    D75 Phi
    Phi size at D75 for sample. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-2
    Maximum:13
    Units:Phi size
    D84 Phi
    Phi size at D84 for sample. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-2
    Maximum:13
    Units:Phi size
    D90 Phi
    Phi size at D90 for sample. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-2
    Maximum:13
    Units:Phi size
    D95 Phi
    Phi size at D95 for sample. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-2
    Maximum:13
    Units:Phi size
    F-W Median
    Phi size median for sample by Folk and Ward (1957) method. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-3
    Maximum:5.65541
    Units:Phi size
    F-W Mean
    Phi size mean for sample by Folk and Ward (1957) method. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-3
    Maximum:5.74835
    Units:Phi size
    F-W Sorting
    sorting for sample by Folk and Ward (1957) method. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0.588
    Maximum:3.05396
    Units:Phi size
    F-W Skewness
    skewness for sample by Folk and Ward (1957) method. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-0.62685
    Maximum:0.6237
    Units:Phi size
    F-W Kurtosis
    Kurtosis for sample by Folk and Ward (1957) method. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0.55152
    Maximum:4.44986
    Units:Phi size
    Inman Median
    Phi size median for sample by Inman (1952) method. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-3
    Maximum:5.65541
    Units:Phi size
    Inman Mean
    Phi size mean for sample by Inman (1952) method. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-3
    Maximum:5.83808
    Units:Phi size
    Inman Sorting
    sorting for sample by Inman (1952) method. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0.5017
    Maximum:3.32918
    Units:Phi size
    Inman Skew 16-84
    skewness for sample (D16-D84) by Inman (1952) method. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-0.89997
    Maximum:0.62284
    Units:Phi size
    Inman Skew 05-95
    skewness for sample (D5-D95) by Inman (1952) method. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-2.60763
    Maximum:2.69141
    Units:Phi size
    Inman Kurtosis
    Kurtosis for sample by Inman (1952) method. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0.17401
    Maximum:5.38786
    Units:Phi size
    1st Moment Mean phi
    moment measure of mean. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-2.125
    Maximum:5.787592
    Units:Phi size
    2nd Moment Variance
    moment measure of variance. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:9.016371
    Units:Phi size
    3rd Moment Skewness
    moment measure of skewness. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:-0.067018
    Maximum:17.733118
    Units:Phi size
    4th Moment Kurtosis
    moment measure of kurtosis. NaN=not a number, because no sample was recovered. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:315.463477
    Units:Phi size

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Andrew W. Stevens
    • Guy Gelfenbaum
    • Jonathan A. Warrick
    • Ian M. Miller
    • Heather M. Weiner
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Andrew W. Stevens
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission St.
    Santa Cruz, CA
    USA

    831-460-7424 (voice)
    astevens@usgs.gov

Why was the data set created?

Data were obtained to assess the ecosystem response following the removal of two dams on the Elwha River. These data are intended for science researchers, students, policy makers, and the general public.

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: 18-Feb-2016 (process 1 of 2)
    Surface sediment was collected on February 16, 2016 at a total of 83 locations using a small ponar, or 'grab', sampler from the R/V Frontier in water depths between 17 and 1 m around the delta. An additional 18 samples were collected by hand at low tide between February 17 and February 18, 2016. A handheld global satellite navigation system (GNSS) receiver was used to determine the locations of sediment samples. Grab samples that yielded less than 50 g of sediment were omitted from analysis and are classified as "no sample".
    Date: 21-Mar-2016 (process 2 of 2)
    The grain-size distributions of suitable samples were determined in the USGS Pacific Coastal and Marine Science Center sediment lab. Approximately 20 g of sediment was sub-sampled and 10 mL of 35 percent hydrogen peroxide was added to remove organic material in the sample. The sample was heated at 250 degrees C to remove any remaining hydrogen peroxide and was placed in an ultrasonic bath to liberate the fine fraction. Subsequently, the sample was centrifuged for 1.5 hours to remove soluble salts. Samples were funneled through 2 mm and 63 um sieves to separate the gravel (greater than 2 mm), sand (63 um to 2 mm), and mud (less than 63 um). The sand and gravel fractions were dried in an 80 degree C oven and weighed. Five mL of sodium hexametaphosphate was added to the mud fraction and a 20 mL aliquot was taken from a 1 L graduated cylinder to determine the weight of the mud. The particle-size distribution of the mud and sand fractions was analyzed separately using a Beckman Coulter LS 13 320, and the gravel, sand, and mud results were integrated into a single grain-size distribution for each sample.
  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?
    The locations of samples were determined using a Garmin 78s handheld global satellite navigation systems (GNSS) receiver capable of receiving wide area augmentation system (WAAS) signals. The manufacturer reported accuracy for horizontal positions is 3-5 m while receiving WAAS signals.
  3. How accurate are the heights or depths?
    No formal positional accuracy tests were conducted
  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 rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    No formal logical accuracy tests were conducted

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints:
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 - Science Base
    U.S. Geological Survey
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    USA

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? Grain-size analyses data are presented as a comma-delimited text file (.csv), along with associated metadata.
  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?

Dates:
Last modified: 07-Dec-2016
Metadata author:
Andrew W. Stevens
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Oceanographer
2885 Mission St.
Santa Cruz, CA
USA

831-460-7424 (voice)
astevens@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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