Discharge measurements from transects of a tidal creek in Corte Madera Marsh, Northern San Francisco Bay, California, during 2022 and 2023.

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Frequently anticipated questions:

What does this data set describe?

Title:
Discharge measurements from transects of a tidal creek in Corte Madera Marsh, Northern San Francisco Bay, California, during 2022 and 2023.
Abstract:
Corte Madera Marsh, located in northern San Francisco Bay, California, is experiencing shoreline erosion. Determining whether the eroded sediment is exported to the bay or imported via tidal channels and deposited on the marsh platform is critical to understanding the long-term response of the marsh to wave attack and sea-level rise. Quantifying water-column sediment flux helps to characterize the role of tidal channels in this process, and water discharge is a key component of sediment flux. Tidal creek discharge was measured repeatedly over diurnal tidal cycles in a tidal channel located in the central, Muzzi marsh region of Corte Madera marsh, California during the summer of 2022 and during the winter of 2023. These transect data were collected using a downward-looking Teledyne RDI RiverPro 1200-kilohertz acoustic Doppler current profiler (ADCP) from a moving boat.
Supplemental_Information:
Information about the data collection field activities are available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-619-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2023-603-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., and Nowacki, Daniel J., 20240806, Discharge measurements from transects of a tidal creek in Corte Madera Marsh, Northern San Francisco Bay, California, during 2022 and 2023.: data release DOI:10.5066/P1XZFGCX, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    McGill, Samantha C., Lacy, Jessica R., Ferreira, Joanne C.T., Nowacki, Daniel J., Stevens, Andrew W., and Tan, Angela C., 2024, Hydrodynamic and sediment transport data from two marshes and adjacent shallows in Northern San Francisco Bay, California 2022-2023: data release DOI:10.5066/P1XZFGCX, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: McGill, S.C., Lacy, J.R., Ferreira, J.C.T., Nowacki, D.J., Stevens, A.W., and Tan, A.C., 2024, Hydrodynamic and sediment transport data from two marshes and adjacent shallows in Northern San Francisco Bay, California 2022-2023: U.S. Geological Survey data release, https://doi.org/10.5066/P1XZFGCX.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.5058680
    East_Bounding_Coordinate: -122.5050730
    North_Bounding_Coordinate: 37.9307330
    South_Bounding_Coordinate: 37.9302660
  3. What does it look like?
    Tidal_Creek_discharge_transect.jpg (jpg)
    Image of discharge measurement being collected in a tidal creek within Corte Madera Marsh.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 09-Aug-2022
    Ending_Date: 20-Jan-2023
    Currentness_Reference:
    ground condition at time data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: binary and text
  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 continuously along survey transects.
    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 0.0001. Longitudes are given to the nearest 0.0001. 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?
    Entity_and_Attribute_Overview:
    This dataset consists of discharge measurements collected using a Teledyne RD Instruments RiverPro ADCP (Teledyne RD Instruments, 2024). All data were collected with Teledyne RD Instruments WinRiver II version 2.23 (Teledyne RD Instruments, 2016) and processed with QRev (Mueller, 2016). Due to the complexity of an ADCP data file and the various algorithms applied to compute the streamflow from ADCP data, these data are most useful in either 1) their original raw data format which can be opened and processed in either WinRiver II or QRev or 2) their processed format which can be opened and processed by QRev or opened by Matlab or any software that can read Matlab formatted files. Both WinRiver II and QRev are distributed free. This dataset is in the form of a zip file, NBM_discharge.zip. The data are divided into folders based on location and acquisition time, and further divided by software association. The top-level folder naming convention consists of Season_X, where Season is specified as Summer or Winter, the survey index is appended. Each of these folders contains two subfolders: QRev_Files and WinRiver_II_Files. The WinRiver II files consist of: 1. .mmt file: XML configuration file used by WinRiver II for setup, specific measurement data entry, and filenames of the raw transect data files (pd0) 2. .pd0 files: raw binary data collected by WinRiver II. The format for these files is defined in Teledyne RD Instruments (2013). The QRev files consist of: 1. .mat files: saved data processed by QRev. These files can be opened and processed by QRev or loaded into Matlab or software that can read Matlab formatted files. The variable definitions are documented in Mueller (2016). 2. .xml: summaries of the data processed by QRev. The variable definitions are documented in Mueller (2016). Refer to the README_NBM_Discharge-File-Explanation.txt file in this directory for further information.
    Entity_and_Attribute_Detail_Citation:
    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)
    • Samantha C. McGill
    • Daniel J. Nowacki
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    PCMSC Science Data Coordinator
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission Street
    Santa Cruz, CA
    USA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

The discharge measurements were used in the development of an index-velocity relationship between flow velocity measured at a single location within the channel and the channel-average velocity. This relationship enables the computation of a time-series of total channel discharge from long-term measurements of current velocity at a single location within the channel. These data were collected as part of a study with the goal to produce information useful for prioritizing marsh restoration sites, assessing restoration actions, and understanding mechanisms of sediment delivery to marshes. 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: 20-Jan-2023 (process 1 of 3)
    Discharge data were collected using a boat-mounted Teledyne RDI RiverPro 1200 kHz acoustic Doppler current profiler (ADCP), in one tidal channel during Spring tides in the summer of 2022 and winter of 2023, at one location within a tidal creek in Corte Madera marsh. The boat repeatedly traversed each channel from one bank to the other, collecting data during each transect crossing. The dates and times of the transect measurements were chosen to cover as much of a full diurnal tidal cycle as possible, subject to logistical and safety constraints. ADCP data were recorded and initially reviewed using WinRiver II version 2.23. WinRiver II is available at http://www.teledynemarine.com/support. The raw data were recorded in .mmt and .pd0 files, which are the native file formats of WinRiver II.
    Date: 07-May-2024 (process 2 of 3)
    Data were post-processed using QRev version 4.31 or 4.33, a program developed by the USGS Office of Surface Water to compute moving-boat ADCP discharge. QRev automates data-quality checks, data filtering, extrapolation methods, and invalid-data-handling steps, and provides estimates of uncertainty to help guide the user. QRev is available at https://hydroacoustics.usgs.gov/movingboat/QRev.shtml.
    Date: 07-May-2024 (process 3 of 3)
    QRev file naming convention consists of YYYYMMDD_HHMMSS_VER_BT_QRev where, starting with the date and time at start of the transect, VER is the QRev software version 4.31 or 4.33, and BT indicates the position within each transect was determined using bottom tracking from the initial GPS position.
  3. What similar or related data should the user be aware of?
    Mueller, David S., 2016, QRev—Software for computation and quality assurance of acoustic doppler current profiler moving-boat streamflow measurements—Technical manual for version 2.8: Open-File Report 2016-1068, U.S. Geological Survey, Reston, VA.

    Online Links:

    Teledyne RD Instruments, Inc., 2016, WinRiver II Software User's Guide: Teledyne RD Instruments, Inc., San Diego, CA.

    Online Links:

    Other_Citation_Details: P/N 957-6231-00
    Teledyne RD Instruments, Inc., 2024, Workhorse RiverPro and RioPro ADCP Guide: Teledyne RD Instruments, Inc., San Diego, CA.

    Online Links:

    Other_Citation_Details: P/N 957-6097-00

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. Data were processed using QRev. QRev uses a color-coded scheme in its graphical user interface to indicate potential areas of concern (e.g., percent change in discharge magnitude between consecutive transects). Because these measurements were made in tidal systems with highly variable bathymetry, these changes are expected and many of the yellow- and red-colored regions in QRev are to be expected. ADCP data were collected in 0.06 m depth bins. Variation in tidal elevation resulted in variation the ability to measure the entire width of the tidal channel. During the highest tides, the marsh was fully inundated and there was no defined edge to the channel. For this reason, all data has been retained and must be handled with care.
  2. How accurate are the geographic locations?
    GPS locations were collected using a Hemisphere A631 GNSS Smart Antenna. The GPS antenna was located directly above the ADCP during data collection. Based on manufacturer specifications, the locations are assumed to be accurate within 2 m Circular Error Probable (CEP).
  3. How accurate are the heights or depths?
    No formal assessment of vertical accuracy was performed.
  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. Data were processed using QRev and reviewed by staff experienced in ADCP discharge measurements. All data were collected using the same instrument, computer, and moving-boat platform.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints No access constraints
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 - CMGDS
    2885 Mission Street
    Santa Cruz, CA
    USA

    1-831-427-4747 (voice)
    pcmsc_data@usgs.gov
  2. What's the catalog number I need to order this data set? This dataset is in the form of a zip file, NBM_discharge.zip, which contains folders and files as described in the Entity and Attribute Overview.
  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: Matlab .mat binary files which are saved data processed by QRev. These files can be opened and processed by QRev or loaded into Matlab or software that can read Matlab formatted files. Distributed with these files are an XML summary file. in format MAT Size: 49.1
      Network links: https://doi.org/10.5066/P1XZFGCX
    • Cost to order the data: None

Who wrote the metadata?

Dates:
Last modified: 06-Aug-2024
Metadata author:
PCMSC Science Data Coordinator
U.S. Geological Survey, Pacific Coastal and Marine Science Center
2885 Mission Street
Santa Cruz, CA
USA

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_P1XZFGCX/NBM_discharge_metadata.faq.html>
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