Modeled surface waves from winds in South San Francisco Bay

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:

What does this data set describe?

Title: Modeled surface waves from winds in South San Francisco Bay
Abstract:
A model application using the phase-averaged wave model SWAN was developed to simulate wind waves in South San Francisco Bay, California, between May 30, 2021, and May 19, 2022. This data release describes the development of the model application, provides input files suitable for running the model using Delft3D version 4.04.01, and includes output from the model simulations in netCDF format.
Supplemental_Information:
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?
    WinklerPrins, Lukas T., and Stevens, Andrew W., 20240314, Modeled surface waves from winds in South San Francisco Bay: data release DOI:10.5066/P9QH0GU5, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: WinklerPrins, L.T., Stevens, A.W., 2024, Modeled surface waves from winds in South San Francisco Bay: U.S. Geological Survey data release, https://doi.org/10.5066/P9QH0GU5.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -123.9195
    East_Bounding_Coordinate: -120.8634
    North_Bounding_Coordinate: 38.4590
    South_Bounding_Coordinate: 36.9500
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/64b9688ed34e70357a2bf187?name=sfb_swan_grid_hsig_ex.png&allowOpen=true (PNG)
    Map showing extent of wave model domains (left) and a map of south San Francisco Bay color coded by significant wave height (right).
    https://www.sciencebase.gov/catalog/file/get/64b9688ed34e70357a2bf187?name=timeseries-01.png&allowOpen=true (PNG)
    Time series of observed (blue) versus modeled (orange) significant wave height values for the summer (top) and winter (bottom) seasons.
    https://www.sciencebase.gov/catalog/file/get/64b9688ed34e70357a2bf187?name=pdfs-01.png&allowOpen=true (PNG)
    Distributions of observed (blue) versus modeled (orange) significant wave height values for the summer (top) and winter (bottom) seasons.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 30-May-2021
    Ending_Date: 19-May-2022
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: text
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 10
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -123.00000
      Latitude_of_Projection_Origin: 0.00000
      False_Easting: 500000.0
      False_Northing: 0.00
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 300
      Ordinates (y-coordinates) are specified to the nearest 300
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS80.
      The semi-major axis of the ellipsoid used is 6378137.00.
      The flattening of the ellipsoid used is 1/298.257222101.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North America Vertical Datum 1988
      Altitude_Resolution: 0.1
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    Model inputs and output files for each set of simulations are provided in separate .zip archives. The Delft3D modeling system can be obtained from https://oss.deltares.nl/. See Deltares (2018) for descriptions of the formats and entity information for files contained in the setup folders.
    Entity_and_Attribute_Detail_Citation:
    See Deltares (2018) for descriptions of the formats and entity information for files contained in the .zip archives.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Lukas T. WinklerPrins
    • Andrew W. Stevens
  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
    PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA
    US

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

Why was the data set created?

A numerical model was applied to investigate seasonal differences in the wave energy along the eastern shoreline of South San Francisco Bay.

How was the data set created?

  1. From what previous works were the data drawn?
    Ferreira and others, 2023 (source 1 of 3)
    Joanne C. T. Ferreira, Lacy, Jessica R., Mcgill, Samantha C., WinklerPrins, Lukas T., Nowacki, Daniel J., Stevens, Andrew W., and Tan, Angela C., 20230412, Hydrodynamic and sediment transport data from Whale's Tail marsh and adjacent waters in South San Francisco Bay, California 2021-2022: U.S. Geological Survey, online.

    Online Links:

    Type_of_Source_Media: online database
    Source_Contribution: observed hydrodynamic timeseries measurements
    Fregoso and others, 2017 (source 2 of 3)
    Fregoso, Theresa A., Wang, Rueen-Fang, Alteljevich, Eli, and Jaffe, Bruce E., 2017, San Francisco Bay Delta Bathymetric/Topographic digital elevation model (DEM) - 2016 SF Bay Delta DEM 10-m: U.S. Geological Survey, online.

    Online Links:

    Type_of_Source_Media: online database
    Source_Contribution: bathymetry data
    Fregoso and others, 2020 (source 3 of 3)
    Fregoso, Theresa A, Jaffe, Bruce E, and Foxgrover, Amy C, 2020, High-resolution (1 m) digital elevation model (DEM) of San Francisco Bay, California, created using bathymetry data collected between 1999 and 2020 (ver. 2.0, July 2021): U.S. Geological Survey, online.

    Online Links:

    Type_of_Source_Media: online database
    Source_Contribution: bathymetry data
  2. How were the data generated, processed, and modified?
    Date: 21-Oct-2022 (process 1 of 2)
    A nested, stand-alone SWAN model application was constructed using Delft3D modeling system to simulate wind waves in South San Francisco Bay between May 30, 2021, and May 19, 2022. The model application included two domains that were 1-way coupled. The coarse overall model domain (wsfb_g1.grd) included the coastal ocean across the entire San Francisco Sacramento/San Joaquin Bay-Delta region was forced along the oceanic boundaries with measured time-varying, spatially uniform wave parameters derived from CDIP station 029 (Point Reyes). The nested detailed model (wsfb_g2.grd) covered south San Francisco Bay and was forced with simulated wind data from the High Resolution Rapid Refresh (HRRR) atmospheric model produced by NOAA with a spatial resolution of 3 km and temporal resolution of 1 hour. Water level data provided from NOAA station 9414523 (Redwood City, California) were used throughout the model domains to simulate tidal variations. Bathymetry data were compiled from Fregoso and others, 2017 and Fregoso and others, 2020. Water density was fixed at 1023 kg/m3 to reflect brackish conditions; a Collins bottom-friction formulation was used with coefficient 0.02; Van der Westhuysen whitecapping was used for better performance in wind-dominated systems. The model inputs were split into 4 time intervals (summer, fall, winter, spring) and run sequentially to simulate approximately 1 year. Data sources used in this process:
    • Fregoso and others, 2017
    • Fregoso and others, 2020
    Date: 30-Jan-2023 (process 2 of 2)
    Stationary model output were produced hourly in four separate seasons. Simulated wave metrics, specifically significant wave height and mean wave period, were compared against observed timeseries measurements collected in the mudflats near Eden Landing (station BMV in Ferreira and others, 2023). Data sources used in this process:
    • Ferreira and others, 2023
  3. What similar or related data should the user be aware of?
    Deltares, 2018, Delft3D Wave User Manual (version 3.05).

    Online Links:

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

  1. How well have the observations been checked?
    Simulated significant wave heights (Hs) were compared against in-situ observations derived from a Nortek Vector acoustic Doppler velocimeter installed at a platform called “BMV” from 07 June to 11 August 2021 (“summer,” with an instrument swap on July 8th) and 23 November 2021 to 31 January 2022 (“winter”), with further details published in Ferreira and others, 2023. This sensor was installed just subtidally in the mudflats about a kilometer offshore of the eastern shore of south San Francisco Bay (see point BMV in Fig. 1). Timeseries comparisons from both seasons are visible in Fig. 2 in the data release. In the summer, the model recreated the daily sea breeze-driven wave field. For the summer season, RMSE of simulated significant wave heights was 0.08 m with a modeled seasonal-mean significant wave height of 0.22 m and bias of -0.031. In the winter, RMSE of simulated significant wave heights was 0.07 m with a modeled seasonal-mean significant wave height of 0.10 m and a bias of -0.035 m. Despite proportionally high RMSE values to modal wave heights, there was decent agreement in the distribution of wave heights across the seasons (Fig. 3 in the data release), which are ultimately critical towards average and cumulative wave power metrics relevant for marsh-edge erosion, which this model was developed for.
  2. How accurate are the geographic locations?
    No formal positional accuracy tests were conducted.
  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?
    Wave height data fall within expected ranges, with only a few specific exceptions at moments when water depth at some model locations becomes extremely small or zero, leading to erroneous wave metrics; these data should be neglected in analyses. Other than these moments, mean wave period (Tm) data generally fall within expected ranges. Peak wave period (Tp) values should be interpreted conservatively as the value can change rapidly and be nonsensical in periods with very low wave energy.

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. This information is not intended for navigational purposes.
  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
    United States

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? Model input files compatible with windows executable of Delft3D4 version 4.04.01 and wave model SWAN (version 40.72ABCDE) are provided in the zip archives. Model inputs and outputs were split into 4 time periods that are season-specific ("season_1_summer_io.zip","season_2_fall_io.zip","season_3_winter_io.zip", and "season_4_spring_io.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?

Dates:
Last modified: 14-Mar-2024
Metadata author:
PCMSC Science Data Coordinator
U.S. Geological Survey, Pacific Coastal and Marine Science Center
2885 Mission Street
Santa Cruz, CA
US

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P9QH0GU5/wt_wave_model_metadata.faq.html>
Generated by mp version 2.9.51 on Fri Mar 15 14:03:34 2024