Mobile Harbor Navigation Channel Delft3D Model Inputs and Results - Initial Existing Conditions Grid

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Frequently anticipated questions:

What does this data set describe?

Title:
Mobile Harbor Navigation Channel Delft3D Model Inputs and Results - Initial Existing Conditions Grid
Abstract:
The numerical model Delft3D (developed by Deltares) was developed to evaluate the potential effects of proposed navigation channel deepening and widening in Mobile Harbor, Alabama (AL). The Delft3D model setup requires the input of a merged topographic and bathymetric elevations, a wave climate based on significant wave heights, peak wave period and mean wave direction, and a tidal-time series. The model was validated by comparing model outputs from deterministic runs with observations of water levels and velocities. The validated model was used to simulate scenarios of existing conditions and proposed with-project conditions (for example, channel deepening and widening). Simulations were performed for one year (the year 2010) and ten years, with and without 0.5 meters (m) of sea level rise. Model inputs and outputs in the form of topography and bathymetry for the scenario runs as well as output water levels and velocities for the deterministic runs are provided in this data release. For further information regarding model input generation and visualization of model output topography and bathymetry, refer to USGS Open-File Report 2018-1123.
  1. How might this data set be cited?
    Passeri, Davina L., Long, Joseph W., Jenkins, Robert L., and Thompson, David M., 20180828, Mobile Harbor Navigation Channel Delft3D Model Inputs and Results - Initial Existing Conditions Grid: U.S. Geological Survey Data Release doi:10.5066/P9SS1DJW, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -88.4612126529462
    East_Bounding_Coordinate: -87.6748359827091
    North_Bounding_Coordinate: 30.697486
    South_Bounding_Coordinate: 29.969949
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 28-Aug-2018
    Currentness_Reference:
    publication date
  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 1368 x 657 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 1
      Ordinates (y-coordinates) are specified to the nearest 1
      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 Climate and Forecast (CF)-compliant metadata in the header of the NetCDF file provides spatial information for projecting the data into a geographic information system. It also provides information about the conventions used for attributes in 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)
    • Davina L. Passeri
    • Joseph W. Long
    • Robert L. Jenkins
    • David M. Thompson
  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: Davina Passeri
    Research Civil Engineer
    600 4th Street South
    St. Petersburg, FL
    US

    727-502-8014 (voice)
    727-502-8001 (FAX)
    dpasseri@usgs.gov

Why was the data set created?

These data were generated for the Delft3D model to evaluate the potential effects of proposed navigation channel deepening and widening in Mobile Harbor, AL. Existing_Initial_Elevations.zip is a dataset that consists of Federal Geographic Data Committee (FGDC) metadata and a Network Common Data Form (NetCDF) file containing the following variables: coordinates of the model grid (Easting and Northing) and the initial bathymetric/topographic (z) model elevation values, in meters, for the simulations of existing conditions.

How was the data set created?

  1. From what previous works were the data drawn?
    USGS Data Series 769 (source 1 of 3)
    Danielson, J.J., Brock, J.C., Howard, D.M., Gesch, D.B., Bonisteel-Cormier, J.M., and Travers, L.J., 20130919, Topobathymetric model of Mobile Bay, Alabama: U.S. Geological Survey, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online digital data
    Source_Contribution: Bathymetry data used to generate initial elevations.
    none (source 2 of 3)
    DeWitt, N.T., Stalk, C.A., Flocks, J.G., Bernier, J.C., Kelso, K.W., Fredericks, J.J., and Tuten, T., 20171130, Single-beam bathymetry data collected in 2015 nearshore Dauphin Island, Alabama: U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

    Type_of_Source_Media: Online digital data
    Source_Contribution: Bathymetry data used to generate the initial elevations.
    none (source 3 of 3)
    U.S. Geological Survey, 20161018, USGS Lidar Point Cloud LA SoTerrebonne-GI 2015 15RCU7060 LAS 2016: U.S. Geological Survey, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online digital data
    Source_Contribution: Lidar data used to generate initial topographic elevations.
  2. How were the data generated, processed, and modified?
    Date: 2017 (process 1 of 3)
    Mathworks MATLAB (R2015a) was used to merge and interpolate bathymetric data from Danielson and others (2013) and DeWitt and others (2017), and topographic lidar survey data from the U.S. Geological Survey (Lidar Point Cloud LA SoTerrebonne-GI 2015 15RCU7060 LAS 2016) onto the Delft3D model grid following the controlled interpolation methods of Plant and others, 2002. This merged topographic and bathymetric dataset provides the initial, existing model elevations. Person who carried out this activity:
    Davina Passeri
    U.S. Geological Survey
    Research Civil Engineer
    600 4th Street S
    St. Petersburg, FL
    USA

    (727)-502-8014 (voice)
    (727)-502-8001 (FAX)
    dpasseri@usgs.gov
    Date: 2018 (process 2 of 3)
    Model bathymetric and topographic output was extracted in Mathworks MATLAB (R2015a) with functions included in the OpenEarth toolbox (provided by Deltares; https://publicwiki.deltares.nl/display/OET/Tools). The resulting bathymetric and topographic elevations from the model grid were then packaged into a NetCDF file using the functions available in MATLAB for inclusion in this data release. Person who carried out this activity:
    Davina Passeri
    U.S. Geological Survey
    Research Civil Engineer
    600 4th Street S
    St. Petersburg, FL
    USA

    (727)-502-8014 (voice)
    (727)-502-8001 (FAX)
    dpasseri@usgs.gov
    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)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?
    Passeri, D.L., Long, J.W., Jenkins, R.J., Thompson, D.M., 20180828, Effects of Proposed Navigation Channel Improvements on Sediment Transport in Mobile Harbor, Alabama: U.S. Geological Survey Open-File Report 2018-1123.

    Online Links:

    Plant, N.G., Holland, K.T., Puleo, J.A., 2002, Analysis of the scale of errors in nearshore bathymetric data: Marine Geology Volume 191, Issue 1-2, November 2002, pg. 71-86..

    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?
    These model elevations are the initial topographic and bathymetric elevations for the simulations of existing conditions. Within the Delft3D model, the coordinates are in Universal Transverse Mercator (UTM).
  3. How accurate are the heights or depths?
    Vertical datum is in the 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?
    These are the complete initial model grid elevations for the simulations of existing conditions. 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 existing initial elevations are topographic and bathymetric elevations at each model grid cell for existing conditions and serve as input for each of the simulations of existing conditions.

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: Davina Passeri
    Research Civil Engineer
    600 4th Street South
    St. Petersburg, FL
    US

    727-502-8014 (voice)
    727-502-8001 (FAX)
    dpasseri@usgs.gov
  2. What's the catalog number I need to order this data set? Existing_Initial_Elevations.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:
Davina Passeri
U.S. Geological Survey, USGS Southeast Area
Research Civil Engineer
600 4th Street South
St. Petersburg, FL
US

727-502-8014 (voice)
727-502-8001 (FAX)
dpasseri@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/Existing_Initial_Elevations.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:49 2021