Percent sand and fines in suspended sediment from water samples from South San Francisco Bay, California, 2021

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Frequently anticipated questions:

What does this data set describe?

Title:
Percent sand and fines in suspended sediment from water samples from South San Francisco Bay, California, 2021
Abstract:
Water samples were collected in South San Francisco Bay adjacent to Whale’s Tail South marsh on three days from June through December 2021 to analyze for suspended-sediment concentration and the percent of sand and fines in suspended sediment.
Supplemental_Information:
Information about the data collection field activities can be found at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-627-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-660-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    McGill, Samantha C., Ferreira, Joanne C.T., and Tan, Angela C., 20230412, Percent sand and fines in suspended sediment from water samples from South San Francisco Bay, California, 2021: data release doi:10.5066/P972R6AW, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Ferreira, Joanne C.T., Lacy, Jessica R., McGill, Samantha C., WinklerPrins, Lukas T., Nowacki, Daniel J., Stevens, Andrew W., and Tan, Angela C., 2023, Hydrodynamic and sediment transport data from Whale's Tail South marsh and adjacent waters in South San Francisco Bay, California 2021-2022: data release doi:10.5066/P972R6AW, 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: -122.14532
    East_Bounding_Coordinate: -122.14520
    North_Bounding_Coordinate: 37.58323
    South_Bounding_Coordinate: 37.58350
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 04-Jun-2021
    Ending_Date: 03-Dec-2021
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Comma-separated values
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference: Data were collected in San Francisco Bay, California
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (7)
    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-5. Longitudes are given to the nearest 1.0E-5. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is World Geodetic System 1984 (WGS84).
      The ellipsoid used is WGS84.
      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?
    WT21_sand_break.csv
    Table containing attribute information associated with the dataset (Source: Producer defined)
    FAN
    U.S. Geological Survey field activity number (FAN). (Source: Producer defined)
    ValueDefinition
    2021-627-FASamples collected during USGS field activity 2021-627-FA. Additional information about this field activity can be found at https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-627-FA
    Sample ID
    Sample identifier (Source: Producer defined) Unique identifier for samples; assigned in the field.
    Date Collected
    Date in month/day/year format of sample collection. (Source: Producer defined)
    Range of values
    Minimum:06/22/2021
    Maximum:12/3/2021
    Units:Date in month/day/year format
    Time(UTC)
    Time of sample collection, in hours:minutes:seconds format, Coordinated Universal Time (UTC) (Source: Producer defined)
    Range of values
    Minimum:00:00:00
    Maximum:23:59:59
    Units:hours:minutes:seconds format, Coordinated Universal Time (UTC)
    Water column location
    The depth below the water surface or elevation above the bed from which the sample was collected. (Source: Producer defined) Values indicating sampling locations within the water column. ”near-surface” and “near-bed” was used to indicate relative location where a measurement could not be assessed due to environmental conditions.
    Total Depth
    Water depth at time of sample. "NA" indicates that no value was recorded. (Source: Producer defined)
    Range of values
    Minimum:0
    Maximum:1.8
    Units:Meters
    Latitude
    Latitude of sample location in decimal degrees, north. (Source: Producer defined)
    Range of values
    Minimum:37.58323
    Maximum:37.58350
    Units:Decimal degrees
    Longitude
    Longitude of sample location in decimal degrees, east. (Source: Producer defined)
    Range of values
    Minimum:-122.14532
    Maximum:-122.14520
    Units:Decimal degrees
    Method
    Method of sample collection (Source: Producer defined)
    ValueDefinition
    pumpedSamples were collected using a peristaltic pump
    grabSamples were collected using a sample bottle
    Sample Note
    Relevant information regarding the sample during its collection. "NA" indicates that no additional information was noted. (Source: Producer defined) Unique note of relevant information regarding sample
    Water g
    Weight of water sample (Source: producer defined)
    Range of values
    Minimum:926.559
    Maximum:1072.802
    Units:gram
    Sediment mg
    Weight of sediment from water sample (Source: producer defined)
    Range of values
    Minimum:13
    Maximum:98
    Units:milligram
    Sand mg
    Weight of sediment with diameter greater than 63mm (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:1.86
    Units:milligram
    Mud mg
    Weight of sediment with diameter less than 63mm (Source: producer defined)
    Range of values
    Minimum:12.79
    Maximum:96.13
    Units:milligram
    Suspended Sediment Concentration mg/L
    The suspended sediment concentration from the sample. (Source: producer defined)
    Range of values
    Minimum:12.78
    Maximum:91.34
    Units:milligram per liter

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Samantha C. McGill
    • Joanne C.T. Ferreira
    • Angela C. Tan
  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

    831-460-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

These data were collected to investigate the resuspension of sand into the water column as part of a study to quantify sediment fluxes and changes in marsh morphology at Whale's Tail marsh in southern San Francisco Bay. These data are intended for 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: 03-Dec-2021 (process 1 of 2)
    Water samples were collected June, July, and December 2021 using a peristaltic pump or sample bottle. Sampling positions were recorded using a hand-held global navigation satellite system (GNSS) receiver. Samples were placed in cold storage until processed.
    Date: 17-Dec-2021 (process 2 of 2)
    Suspended sediment measurements were made in the USGS Pacific Coastal and Marine Science Center sediment lab. The total sample and container weight was first obtained, and the sample was rinsed through a 63mm sieve to split the sample into sand and fine fractions. The empty container weight was obtained to determine the total sample concentration. The sand fraction was dried and weighed. Obtaining the fine fraction weight depended on the concentration of fines. Large quantities of the fine fraction were centrifuged and dried before weighing, and small quantities were filtered and dried before weighing.
  3. What similar or related data should the user be aware of?
    Folk, Robert Louis, and Ward, William C., 1957, Brazos River bar; a study in the significance of grain size parameters: Journal article Journal of Sedimentary Research, v. 27, n. 1, p. 3-26, SEPM Society for Sedimentary Geology, Boulder, CO.

    Online Links:

    Inman, Douglas Lamar, 1952, Measures for describing the size distribution of sediments: Journal article Journal of Sedimentary Research, v. 22, n. 3, p. 125-145, SEPM Society for Sedimentary Geology, Boulder, CO.

    Online Links:

    Trask, Parker D., 1930, Mechanical analyses of sediments by centrifuge: Journal article Economic Geology, v. 26, n. 6, p. 581-599, Society of Economic Geologists (SEG), Littleton, CO.

    Online Links:

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

  1. How well have the observations been checked?
    Data values are within the expected values, with the sand fraction significantly smaller than the mud fraction. No sand content in the winter samples.
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  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?
    Data values are within the expected values. Duplicate samples yielded similar results.

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 (USGS) as the originator of the dataset and in products derived from these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - CMGDS
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in csv format (WT21_sand break.csv) accompanied by CSDGM FGDC-compliant 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: file contains the csv table in format comma-delimited text (version Microsoft Excel 2002 (12527.20988) 64-bit) Size: 0.002
      Network links: https://doi.org/10.5066/P972R6AW
    • Cost to order the data: None.

  5. What hardware or software do I need in order to use the data set?
    The data is available in comma-separated values (CSV) spreadsheet format. Text editing software can be used to open the file, as well as spreadsheet programs, such as Microsoft Excel.

Who wrote the metadata?

Dates:
Last modified: 19-Apr-2023
Metadata author:
PCMSC Science Data Coordinator
U.S. Geological Survey, Pacific Coastal and Marine Science Center
2885 Mission Street
Santa Cruz, CA
United States

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/CMGDS_DR_tool/DR_P972R6AW/WT21_sand_break_metadata.faq.html>
Generated by mp version 2.9.51 on Fri Apr 28 10:32:11 2023