Storm-Impact Scenario XBeach Model Inputs – Initial Bathymetry and Topography Digital Elevation Model (DEM) Grid

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Frequently anticipated questions:

What does this data set describe?

Title:
Storm-Impact Scenario XBeach Model Inputs – Initial Bathymetry and Topography Digital Elevation Model (DEM) Grid
Abstract:
The numerical model XBeach (version 4937) was used to investigate how different storm scenarios impact the sediment berm constructed offshore of the Chandeleur Islands and adjacent areas. The XBeach model solves coupled 2-dimensional, horizontal wave propagation equations to predict flow, sediment transport, and bottom changes for varying spectral wave and flow boundary conditions (Roelvink and others, 2009 ). The XBeach model setup requires the input of a merged topographic and bathymetric DEM, and inputs of wave spectra (based on significant wave height, peak wave period, and wave direction) and water level (tide and surge) time series at the seaward model boundary that span the duration of each storm bin. The Xbeach model input and output of topography and bathymetry resulting from simulation of storm-impact scenarios at the Chandeleur Islands, LA, as described in USGS Open-File Report 2017–1009 are provided via a USGS data release (storm scenario bins where no events were observed are excluded). For further information regarding model input generation and visualization of model output topography and bathymetry, refer to Mickey and others (2017).
  1. How might this data set be cited?
    Mickey, Rangley C., Long, Joseph W., Thompson, David, Dalyander, P. Soupy, and Plant, Nathaniel, 20170216, Storm-Impact Scenario XBeach Model Inputs – Initial Bathymetry and Topography Digital Elevation Model (DEM) Grid: U.S. Geological Survey Data Release doi:10.5066/F72F7KJK, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -88.8654564994
    East_Bounding_Coordinate: -88.7366845091
    North_Bounding_Coordinate: 30.0633577357
    South_Bounding_Coordinate: 29.7867685543
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 10-Sep-2016
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: raster digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference: Gulf of Mexico
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 1150 x 640 x 1, type Grid Cell
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 16
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -87.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000
      Planar coordinates are encoded using Row and Column
      Abscissae (x-coordinates) are specified to the nearest 2.5
      Ordinates (y-coordinates) are specified to the nearest 25
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodectic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.25722210100002.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum of 1988
      Altitude_Resolution: 0.0001
      Altitude_Distance_Units: meter
      Altitude_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    The CF-compliant metadata in the header of the NetCDF file provides spatial information for projecting the data into a GIS as well as the start date and time step for the time-series of data in the file. It also provides information about the conventions used for attributes in the dataset and the source software used to create the dataset.
    Entity_and_Attribute_Detail_Citation:
    The entity and attribute information was generated by the individual and/or agency identified as the originator of the dataset. 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)
    • Rangley C. Mickey
    • Joseph W. Long
    • David Thompson
    • P. Soupy Dalyander
    • Nathaniel Plant
  2. Who also contributed to the data set?
    U.S. Geological Survey
  3. To whom should users address questions about the data?
    U.S. Geological Survey, USGS Southeast Area
    Attn: Rangley Mickey
    Research III
    600 4th Street South
    St. Petersburg, FL
    US

    727-502-8115 (voice)
    727-502-8001 (FAX)
    rmickey@usgs.gov

Why was the data set created?

These data were generated for the XBeach model to indicate how an idealized berm structure would evolve under varying magnitudes of storm conditions. The merged topographic and bathymetric DEM is included in the download file, Initial_Model_DEM.zip. This dataset consists of Federal Geographic Data Committee (FGDC) metadata and a NetCDF file containing the following variables: coordinates of the model grid (Easting and Northing) and the initial bathymetry/topography elevation (z) model grid.

How was the data set created?

  1. From what previous works were the data drawn?
    BICM06-07 (source 1 of 9)
    Kindinger, J.L., Buster, N.A., Flocks, J.G., Bernier, J.C., and Kulp, M.A., 20130411, Louisiana Barrier Island Comprehensive Monitoring (BICM) Program Summary Report: Data and Analyses 2006 through 2010: U.S. Geological Survey Open-File Report 2013–1083, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online digital data
    Source_Contribution: Bathymetry data used to generate intial DEM bathymetry.
    USGS Data Series 848 (source 2 of 9)
    DeWitt, N.T., Pfeiffer, W.R., Bernier, J.C., Buster, N.A., Miselis, J.L., Flocks, J.G., Reynolds, B.J., Wiese, D.S., and Kelso, K.W., 20140912, Coastal bathymetry data collected in 2011 from the Chandeleur Islands, Louisiana: U.S. Geological Survey Data Series 848, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online digital data
    Source_Contribution: Bathymetry data used to generate intial DEM bathymetry.
    USGS Data Series 847 (source 3 of 9)
    DeWitt, N.T., Pfeiffer, W.R., Miselis, J.L., Bernier, J.C., Reynolds, B.J., Wiese, D.S., and Kelso, K.W., 20140808, Coastal bathymetry and backscatter data collected in 2012 from the Chandeleur Islands, Louisiana: U.S. Geological Survey Data Series Report 847, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online digital data
    Source_Contribution: Bathymetry data used to generate intial DEM bathymetry.
    USGS Data Series 840 (source 4 of 9)
    Guy, K.K., Plant, N.G., and Bonisteel-Cormier, 20140602, Topographic lidar survey of the Chandeleur Islands, Louisiana, February 6, 2012: U.S. Geological Survey Data Series 840, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online digital data
    Source_Contribution: Lidar data used to generate intial DEM topography.
    USGS Data Series 839 (source 5 of 9)
    Guy, K.K., Doran, K.J., Stockdon, H.F., and Plant, N.G., 20140602, Topographic Lidar Survey of the Alabama, Mississippi, and Southeast Louisiana Barrier Islands, from September 5 to October 11, 2012: U.S. Geological Survey Data Series 839, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online digital data
    Source_Contribution: Lidar data used to generate inital DEM topography.
    USGS Data Series 838 (source 6 of 9)
    Guy, K.K., and Plant, N.G., 20140602, Topographic lidar survey of Dauphin Island, Alabama and Chandeleur, Stake, Grand Gosier and Breton Islands, Louisiana, July 12–14, 2013: U.S. Geological Survey Data Series 838, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online digital data
    Source_Contribution: Lidar data used to generate intial DEM topography.
    USGS OFR-1074 (source 7 of 9)
    Plant, N.G., and Guy, K.K., 20130401, Change in the length of the northern section of the Chandeleur Islands oil berm, September 5, 2010, through September 3, 2012: U.S. Geological Survey Open-File Report 2013–1074, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online digital data
    Source_Contribution:
    Report outlined berm footprint used to generate Gaussian-shaped curve for berm merged into intial topography.
    USGS OFR-1075 (source 8 of 9)
    Plant, N.G., and Guy, K.K., 20130401, Change in the length of the middle section of the Chandeleur Islands oil berm, November 17, 2010, through September 6, 2011: U.S. Geological Survey Open-File Report 2013–1075, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online digital data
    Source_Contribution:
    Report outlined berm footprint used to generate Gaussian-shaped curve for berm merged into intial topography.
    USGS OFR-1303 (source 9 of 9)
    Plant, N.G., and Guy, K.K., 20140210, Change in the length of the southern section of the Chandeleur Islands oil berm, January 13, 2011, through September 3, 2012: U.S. Geological Survey Open-File Report 2013–1303, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online digital data
    Source_Contribution:
    Report outlined berm footprint used to generate Gaussian-shaped curve for berm merged into intial topography.
  2. How were the data generated, processed, and modified?
    Date: 2016 (process 1 of 2)
    Mathworks MATLAB (R2015a) was used to merge and interpolate bathymetric and topographic data onto the model grid coordinate system following the methods of Plant and others (2009) using the bathymetric surveys collected from 2006 to 2007 (Kindinger and others, 2013) and 2011 to 2012 (DeWitt and others, 20140912; DeWitt and others, 20140808); and topographic lidar surveys collected from 2012 (Guy and others, 2014 [USGS DS 839]; Guy and others, 2014 [USGS DS 840]; Guy and Plant, 2014). In addition, satellite imagery, collected approximately every two weeks, from 2010 to 2011 was analyzed to outline the footprint of the fully constructed berm (fig. 2) (Plant and Guy, 2013 [OFR-1074]; 2013 [OFR-1075]; 2014). The berm outline was used as a boundary to generate a Gaussian-shaped curve representing a 2 m high berm, relative to NAVD-88, which was included in the process of merging all bathymetric and topographic surveys. This merged topographic and bathymetric dataset provides an initial DEM that serves as the initial elevation model for each storm-impact scenario simulation. Person who carried out this activity:
    Rangley Mickey
    U.S. Geological Survey
    Researcher III
    600 4th Street S
    St. Petersburg, FL
    USA

    (727)-502-8115 (voice)
    (727)-502-8001 (FAX)
    rmickey@usgs.gov
    Date: 13-Oct-2020 (process 2 of 2)
    Added keywords section with USGS persistent identifier as theme keyword. 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?
    Roelvink, D., Reniers, A., van Dongeren, A., van Thiel de Vries, J., McCall, R., and Lescinski, J., 20090915, Modeling storm impacts on beaches, dunes and barrier islands: Coastal Engineering Volume 56, Issues 11–12, November–December 2009, pg. 1133-1152.

    Online Links:

    Mickey, R.C., Long, J.W., Thompson, D.M., Plant, N.G., Dalyander, P.S., 2017, A methodology for modeling barrier island storm-impact scenarios: U.S. Geological Survey Open-File Report 2017-1009.

    Online Links:

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

  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
    This DEM contains the initial model topographic and bathymetric elevations. Within the XBeach model, the coordinates are in Universal Transverse Mercator (UTM).
  3. How accurate are the heights or depths?
    Vertical datum is in North American Vertical Datum of 1988 (NAVD88) with an estimated resolution of 0.01 m.
  4. Where are the gaps in the data? What is missing?
    This DEM contains the complete initial model grid elevation. This dataset is considered complete for the information presented, as described in the abstract section. 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?
    The initial DEM, that serves as input for each scenario, indicates topographic and bathymetric elevations in all model grid cells.

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:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey, USGS Southeast Area
    Attn: Rangley Mickey
    Researcher III
    600 4th Street South
    St. Petersburg, FL
    US

    727-502-8115 (voice)
    727-502-8001 (FAX)
    rmickey@usgs.gov
  2. What's the catalog number I need to order this data set? Initial_Model_DEM.nc
  3. What legal disclaimers am I supposed to read?
    This digital publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 13-Oct-2020
Metadata author:
Rangley Mickey
U.S. Geological Survey, USGS Southeast Area
Researcher III
600 4th Street South
St. Petersburg, FL
US

727-502-8115 (voice)
727-502-8001 (FAX)
rmickey@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/Initial_DEM.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:50 2021