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Tables in Seabed ripple morphology and surficial sediment size at the SAX04 experiments near Fort Walton Beach, Florida, fall 2004

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

Frequently-anticipated questions:


What does this data set describe?

Title:
Tables in Seabed ripple morphology and surficial sediment size at the SAX04 experiments near Fort Walton Beach, Florida, fall 2004
Abstract:
These data tables are a result of a seabed ripple morphology and surficial sediment size field study in 2004 and are an integral part of the report whose aim is to present methods employed to extract data and the resulting measured ripple characteristics (i.e., ripple height, wavelength, and orientation) and seabed grain sizes near Fort Walton Beach, Florida.
  1. How should this data set be cited?

    Hanes, D.M., Erikson, L.H., Lescinski, J.M.R, 2007, Tables in Seabed ripple morphology and surficial sediment size at the SAX04 experiments near Fort Walton Beach, Florida, fall 2004:.

    This is part of the following larger work.

    Hanes, D.M., Erikson, L.H., Lescinski, J.M.R, 2007, Seabed ripple morphology and surficial sediment size at the SAX04 experiments near Fort Walton Beach, Florida, fall 2004: Open-File Report 2007-1232, U.S. Geological Survey, Coastal and Marine Geology Program, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -86.65620
    East_Bounding_Coordinate: -86.61060
    North_Bounding_Coordinate: 30.39550
    South_Bounding_Coordinate: 30.07290

  3. What does it look like?

    <http://walrus.wr.usgs.gov/infobank/p/p104fl/html/p-1-04-fl.meta.html> (GIF)
    Index map of field activity P-1-04-FL.
    <http://walrus.wr.usgs.gov/infobank/p/p204fl/html/p-2-04-fl.meta.html> (GIF)
    Index map of field activity P-2-04-FL.

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 25-Sep-2004
    Ending_Date: 10-Nov-2004
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: spreadsheet

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Point data set.

    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 0.001. Longitudes are given to the nearest 0.001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 1.0
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Implicit coordinate

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    Mean heading, pitch, and roll measured at each ADP Drop:
      Station ID
      ADP ID
      Heading (decimal degrees)
      Pitch (decimal degrees)
      Roll (decimal degrees)
    
    Ripple wavelengths and orientations from INX:
      Drop ID
      4 m scan lambda (meters)
      4 m scan delta (degrees)
      10 m scan lambda (meters)
      10 m scan delta (degrees)
      Sweep radii (meters)
      Employeed lambda (meters)
      Employed delta (degrees)
      Employed Sweep used
    
    Summary of thresholds chosen to extract MTA data:
      Drop ID
      Filename
      Threshold value(s) employed (mV)
    
    Ripple heights obtained with the MTA:
      Drop ID
      ripple height (centimeters)
    
    Ripple heights obtained with the slide projector:
      Drop ID
      ripple height (centimeters)
    
    Data summary:
      Index
      Drop ID
      height (meters)
      Latitude (decimal degrees)
      Longitude (decimal degrees)
      Ripple wavelength (centimeters)
      Ripple orientation (degrees counter clockwise from East)
      Ripple height (centimeters)
      Sediment grain size (milimeters)
    
    
    Entity_and_Attribute_Detail_Citation: none


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Daniel M. Hanes
    U.S. Geological Survey, Coastal and Marine Geology
    Coastal Oceanographer
    400 Natural Bridges Dr
    Santa Cruz, CA 95060-5792
    USA

    (831) 427-4718 (voice)
    (831) 427-4748 (FAX)
    dhanes@usgs.gov


Why was the data set created?

Sediment transport in the coastal region is a complex process involving interactions between flow dynamics, sediments, and bedforms. Sediment type and bed geometry directly influence entrainment of sediments into suspension, and at sites where ripples occur (sand formations on the order of several cm high and less than two meter long wavelengths), the understanding of ripple dynamics is an essential component in improving sediment transport models. To gain a better understanding and ability to predict sediment transport, a field study was undertaken to investigate morphology, orientation, and dynamics of ripples on the seafloor.


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: 2007 (process 1 of 1)
    An explanation of the event and related parameters or tolerances is in the larger work.

  3. What similar or related data should the user be aware of?

    U.S. Geological Survey, Coastal and Marine Geology Program, 2007, InfoBank.

    Online Links:

    U.S. Geological Survey, Coastal and Marine Geology Program, 200412, Ripples for everyone! - Investigating how sediment moves on the sea floor in Sound Waves Monthly Newsletter, Coastal Science & Reasearch News from Across the USGS.

    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?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    All avaialble data were analyzed; in cases where multiple data were available for a given site and parameter, optimal results based on statistcal analyses are reported.

  5. How consistent are the relationships among the observations, including topology?

    Ripple wavelength and height measurements are direct interpretations from sonar data corrected for tilt and rotation where necessary. Ripple heights are estimates based on best fit sinusoids to measured profile data. Grain sizes represent direct point measurements of surficial sediments.


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 is freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey, Coastal and Marine Geology
    c/o Daniel M. Hanes
    Coastal Oceanographer
    400 Natural Bridges Dr
    Santa Cruz, CA 95060-5792
    USA

    (831) 427-4718 (voice)
    (831) 427-4748 (FAX)
    dhanes@usgs.gov

  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Although this data set has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.

    Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 29-Oct-2007
Metadata author:
U.S. Geological Survey, Coastal and Marine Geology
c/o Daniel M. Hanes
Coastal Oceanographer
400 Natural Bridges Dr
Santa Cruz, CA 95060-5792
USA

(831) 427-4718 (voice)
(831) 427-4748 (FAX)
dhanes@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)


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