Surface-sediment grain-size distributions of the Elwha River delta, Washington, July 2017

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
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  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
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What does this data set describe?

1. How might this data set be cited?
   Stevens, Andrew W., Gelfenbaum, Guy R., Warrick, Jonathan A., Miller, Ian M., and Weiner, Heather M., 2019, Surface-sediment grain-size distributions of the Elwha River delta, Washington, July 2017: data release DOI:10.5066/P9AJ8ALB, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/P9AJ8ALB

   This is part of the following larger work.
   Stevens, Andrew W., Gelfenbaum, Guy R., Warrick, Jonathan A., Miller, Ian M., and Weiner, Heather M., 2019, Bathymetry, topography, and sediment grain-size data from the Elwha River delta, Washington, July 2017: data release DOI:10.5066/P9AJ8ALB, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/P9AJ8ALB

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -123.583902
   East_Bounding_Coordinate: -123.472985
   North_Bounding_Coordinate: 48.154344
   South_Bounding_Coordinate: 48.132619
   

3. What does it look like?
4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 20-Jul-2017

   Ending_Date: 22-Jul-2017

   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 dataset (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)

   Value	Definition
   Yes	Sample collection successful at site, sample collected
   No	Sample collection unsuccessful, no sample recovered

   Date Collected

   Date of sample collection in mm/dd/yyyy format (Source: producer defined)

   Range of values
   Minimum:	7/20/2017
   Maximum:	7/22/2017
   Units:	Dates in mm/dd/yyyy format

   Time (GMT)

   Time of sample collection in HH:MM:SS format relative to Greenwich 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:	48.132619
   Maximum:	48.154344
   Units:	decimal degrees

   Longitude (deg. E)

   Longitude of sample in decimal degrees, east (Source: producer defined)

   Range of values
   Minimum:	-123.583902
   Maximum:	-123.472985
   Units:	decimal degrees

   Sample Type

   Type of sample collected (Source: Produce defined)

   Value	Definition
   Surface	Sample collected on land by hand
   Grab	Sample 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. NaN=not a number or 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:	-4
   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:	-4
   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:	-4
   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:	-4
   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:	-4
   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:	-4
   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:	-4
   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:	-4
   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:	-4
   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:	-3.00
   Maximum:	6.31
   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:	-3.00
   Maximum:	6.45
   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:	0.51
   Maximum:	3.47
   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:	-0.93
   Maximum:	0.66
   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:	0.56
   Maximum:	2.88
   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:	-3.00
   Maximum:	6.31
   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:	-3.00
   Maximum:	6.52
   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:	0.43
   Maximum:	3.40
   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:	-1.10
   Maximum:	0.69
   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:	-3.40
   Maximum:	3.11
   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:	-0.14
   Maximum:	5.23
   Units:	Phi size

   Moment 1 Mean

   moment measure of mean. NaN=not a number, because no sample was recovered. (Source: producer defined)

   Range of values
   Minimum:	-2.13
   Maximum:	6.28
   Units:	Phi size

   Moment 2 Variance

   moment measure of variance. NaN=not a number, because no sample was recovered. (Source: producer defined)

   Range of values
   Minimum:	0.00
   Maximum:	10.35
   Units:	Phi size

   Moment 3 Skewness

   moment measure of skewness. NaN=not a number, because no sample was recovered. (Source: producer defined)

   Range of values
   Minimum:	-0.51
   Maximum:	95.33
   Units:	Phi size

   Moment 4 Kurtosis

   moment measure of kurtosis. NaN=not a number, because no sample was recovered. (Source: producer defined)

   Range of values
   Minimum:	0.00
   Maximum:	9088.91
   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 R. 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?
   U.S. Geological Survey, Pacific Coastal and Marine Science Center

   Attn: PCMSC Science Data Coordinator

   2885 Mission Street

   Santa Cruz, CA
   

   831-427-4747 (voice)

   pcmsc_data@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: 22-Jul-2017 (process 1 of 4)

   Surface sediment was collected on July 20, 2017 at a total of 80 locations using a small ponar, or 'grab', sampler from the R/V Frontier in water depths between about 1 and 17 m around the delta. An additional 31 samples were collected by hand at low tide between July 21 and July 22, 2017. A hand-held 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.

   Date: 31-Jan-2018 (process 2 of 4)

   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.

   Date: 20-Jun-2019 (process 3 of 4)

   Edits were made to standardize a few of the "None" keywords. Person who carried out this activity:
   

   Susan A Cochran

   U.S. Geological Survey, Pacific Coastal and Marine Science Center

   2885 Mission St.

   Santa Cruz, CA
   

   United States

   831-460-7545 (voice)

   scochran@usgs.gov

   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)

   vatnipp@usgs.gov

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. Grab samples that yielded less than 50 g of sediment were omitted from analysis. 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?
   • Availability in digital form:

     Data format:	comma-delimited text file in format comma-delimited text (version Microsoft Excel 14.0.7173.5000) CSV Size: 0.08
     Network links:	https://www.sciencebase.gov/catalog/file/get/5c9bf765e4b0b8a7f62c32c3/?name=ew17_july_grainsize.csv https://www.sciencebase.gov/catalog/item/5c9bf765e4b0b8a7f62c32c3 https://doi.org/10.5066/P9AJ8ALB

   • Cost to order the data: None

Who wrote the metadata?

Dates:

Last modified: 19-Oct-2020

Metadata author:

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Attn: PCMSC Science Data Coordinator

2885 Mission Street

Santa Cruz, CA

831-427-4747 (voice)

pcmsc_data@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)