Storm-Impact Scenario XBeach Model Results – Scenario 12 Digital Elevation Model (DEM) Grid

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Frequently anticipated questions:

What does this data set describe?

Storm-Impact Scenario XBeach Model Results – Scenario 12 Digital Elevation Model (DEM) Grid
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 Results – Scenario 12 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
    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
      UTM_Zone_Number: 16
      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.
      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?
    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.
    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

    727-502-8115 (voice)
    727-502-8001 (FAX)

Why was the data set created?

These data were generated from the XBeach model to indicate how an idealized berm structure would evolve under varying magnitudes of storm conditions., is a dataset consisting of Federal Geographic Data Committee (FGDC) metadata and a NetCDF file containing the following variables: coordinates of the model grid (Easting and Northing); the final bathymetry/topography model grid for Scenario 12 (zend_12).

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: 2016 (process 1 of 3)
    The XBeach model simulates morphologic change that results from hydrodynamic impacts and sediment transport. Following the steps provided in the XBeach user manual (, the model was set up using a params.txt file (an example Xbeach model input file can be found in the appendix of OFR 2017-XXX). Significant wave heights and peak wave periods were provided from the representative scenario binning method outlined in Mickey and others (2017). The model was then executed and the resulting topographic and bathymetric elevations, calculated at the end of each scenario, were output into an intermediary MATLAB grid (.grd format). Person who carried out this activity:
    Rangley Mickey
    U.S. Geological Survey
    Researcher III
    600 4th Street S
    St. Petersburg, FL

    (727)-502-8115 (voice)
    (727)-502-8001 (FAX)
    Date: 2016 (process 2 of 3)
    Model bathymetric and topographic outputs were extracted in Mathworks MATLAB (R2015a) with functions provided in the OpenEarth toolbox (provided by Deltares,, The resulting bathymetric and topographic elevations from the model grid were then packaged into a NetCDF file, using the export functions available in MATLAB, for inclusion in this data release. Person who carried out this activity:
    Rangley Mickey
    U.S. Geological Survey
    Researcher III
    600 4th Street S
    St. Petersburg, FL

    (727)-502-8115 (voice)
    (727)-502-8001 (FAX)
    Date: 13-Oct-2020 (process 3 of 3)
    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)
  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 resultant model topographic and bathymetric elevations from storm-impact scenario 12 simulation. 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 resultant model grid elevation from storm-impact scenario 12. 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 resultant DEM from Scenario 12 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.
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

    727-502-8115 (voice)
    727-502-8001 (FAX)
  2. What's the catalog number I need to order this data set?
  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?

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

727-502-8115 (voice)
727-502-8001 (FAX)
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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