Hydrological Data Concerning Submarine Groundwater Discharge Along the Western Margin of Indian River Lagoon, East-Central Florida-December 2016 and January 2017

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Frequently anticipated questions:

What does this data set describe?

Title:
Hydrological Data Concerning Submarine Groundwater Discharge Along the Western Margin of Indian River Lagoon, East-Central Florida-December 2016 and January 2017
Abstract:
Stretching along approximately 200 kilometers (km) of the Atlantic Coast of central Florida, Indian River Lagoon is one of the most biologically diverse estuarine systems in the continental United States. This shallow, brackish lagoon varies in width from about 0.5–9.0 km, with substantial human infrastructure lining both shores. Scientists from the U. S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center used continuous resistivity profiling (CRP), a towed electronic array, to investigate submarine groundwater discharge at Eau Gallie North, a study site located along the western shore of the central section of Indian River Lagoon. The CRP array was towed behind a boat along five shore-parallel transects located between 125-750 meters (m) offshore and traversing ~ 1.5 km along north-south transects. Additional, subsequent resistivity surveys will be conducted along these same tracklines, at various times to determine temporal variability. Since resistivity is a function of both geology and salinity, it is assumed that temporal shifts will reflect salinity changes, as the underlying geology will be presumed to remain constant.
Supplemental_Information:
To ensure that USGS-St. Petersburg data management protocols were followed, each survey was assigned the following USGS FAN: 2016-369-FA (December 2016, Project ID 16SGD03) and 2017-306-FA (January 2017, Project ID 17SGD01). Additional survey and data details are available from the U.S. Geological Survey Coastal and Marine Geoscience Data System (CMGDS) at, http://cmgds.marine.usgs.gov/.
  1. How might this data set be cited?
    McCloskey, Terrence A., 20170420, Hydrological Data Concerning Submarine Groundwater Discharge Along the Western Margin of Indian River Lagoon, East-Central Florida-December 2016 and January 2017: U.S. Geological Survey Data Release doi:10.5066/F7PZ5725, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

    This is part of the following larger work.

    McCloskey, Terrence A., Smith, Christopher G., Zaremba, Nick J., McBride, Elsie C., Everhart, Cheyenne, and Forde, Arnell S., Unknown, The use of ERT and CRP methodologies to assess the magnitude of submarine groundwater discharge into Indian River Lagoon, Florida.

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -80.6920150
    East_Bounding_Coordinate: -80.612115
    North_Bounding_Coordinate: 28.121337
    South_Bounding_Coordinate: 28.109019
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 14-Dec-2016
    Ending_Date: 26-Jan-2017
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Multimedia presentation
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • Point (17)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 17
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: 81.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000.0
      False_Northing: 0.0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.00001
      Ordinates (y-coordinates) are specified to the nearest 0.00001
      Planar coordinates are specified in Meters
      The horizontal datum used is D WGS 1984.
      The ellipsoid used is WGS 1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum of 1988
      Altitude_Resolution: 0.001
      Altitude_Distance_Units: Meters
      Altitude_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    12-2016-GPS.zip
    Comma-separated values text file defining time, date, location, speed of movement, magnetic orientation, transducer offset distance, water depth and water temperature as recorded along tracks IRL001-IRL006 on the western edge of Indian River Lagoon, FL, December 2016 (USGS FAN 2016-369-FA). (Source: USGS)
    12-2016-STG.zip
    Comma-separated values text file defining the time, date, voltage, apparent resistivity, coordinates of the current and potential electrodes and the temporal identification of the potential electrode being recorded along tracks IRL 001-IRL006 on the western edge of Indian River Lagoon, FL, December 2016 (USGS FAN 2016-369-FA). (Source: USGS)
    01-2017-GPS.zip
    Comma-separated values text file defining time, date, location, speed of movement, magnetic orientation, transducer offset distance, water depth and water temperature as recorded along tracks EGN302-EGN313 on the western edge of Indian River Lagoon, FL, January 2017 (USGS FAN 2017-306-FA). (Source: USGS)
    01-2017-STG.zip
    Comma-separated values text file defining the time, date, voltage, apparent resistivity, coordinates of the current and potential electrodes and the temporal identification of the potential electrode being recorded along tracks EGN302-EGN313 on the western edge of Indian River Lagoon, FL, January 2017 (USGS FAN 2016-306-FA). (Source: USGS)
    Entity_and_Attribute_Overview:
    The detailed attribute descriptions for the GPS and STG files are provided in the included data dictionaries (DataDictionary-GPS.pdf and DataDictionary-STG.pdf, respectively). These metadata are not complete without these .pdf files. The detailed attribute descriptions for the GPS files are provided in the included data dictionary (GPS_Data_Dictionary.pdf). These metadata are not complete without these files.
    Entity_and_Attribute_Detail_Citation:
    Data dictionary for GPS data tables, in: McCloskey, T.A., Smith, C. G., Zaremba, N., McBride, E., and Everhart. C., 2017, Hydrological data concerning submarine groundwater discharge along the western margin of Indian River Lagoon, east-central Florida-December 2016 and January 2017 U.S.: Geological Survey data release, https://doi.org/10.5066/F7PZ5725.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Terrence A. McCloskey
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: Christopher G. Smith
    Research Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    cgsmith@usgs.gov

Why was the data set created?

Dissemination of resistivity, water column, and global positioning system (GPS) data collected from Indian River Lagoon in December 2016 and January 2017 (USGS Field Activity Numbers [FAN] 2016-369-FA, 2017-306-FA).

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: 2017 (process 1 of 5)
    A 100-m long CRP cable manufactured by Advanced Geosciences Inc. (AGI) of Austin, TX was towed behind a USGS barge, along five shore-parallel latitudinal transects located approximately 125, 200, 350, 500 and 750 m off the western edge of the central section of Indian River Lagoon, FL. The locations of seven pre-planned tracklines conducive to CRP profiling were determined prior to arrival at the study area; however, lines EA. and EG. were not run during either survey, due to water conditions. The remaining transects, EB.–EF., will be profiled repeatedly to discover temporal variability. The CRP cable consists of an array of electrodes, with two current (transmitting) electrodes and a number of potential (receiving) electrodes, producing a file (.stg) that records apparent resistivity between the matched pairs of current and potential electrodes. Spacing between the receiving electrodes is either 5 or 10 m, depending upon the connection ("pigtail") used to couple the cable to the recording device, the AGI Supersting R8/IP. Data consists of vertical profiles of electrical resistance extending from ~10-25 m below the seafloor, with the 10 m electrode spacing resulting in deeper penetration. Data were collected during two field trips: Lines IRL001-IRL006 were collected on 12/14/2016, lines EGN302-EGN305 on 01/25/2017 and lines EGN306-EGN313 on 01/26/2017. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Christopher G Smith
    Research Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    cgsmith@usgs.gov
    Date: 2017 (process 2 of 5)
    Water depth, water temperature and geographical coordinates were collected by a Lowrance boat-mounted GPS system that was temporally synchronized with the resistivity array, producing a National Marine Electronics Association (NMEA) 0813 file (.gps). The GPS functions enabled were Recommended Minimum Navigation Information (RMC), Depth of Water (DPT), and Mean Temperature of Water (MTW). Person who carried out this activity:
    U.S. Geological Survey
    Attn: Christopher G Smith
    Research Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    cgsmith@usgs.gov
    Date: 2017 (process 3 of 5)
    The raw .stg (apparent resistivity) and raw .gps (NMEA 0813) files were uploaded into the Marine Log Manger (registered trademark, AGI) module in the SuperSting R8/IP (registered trademark, AGI) software. The two data files were combined, linearized and clipped to remove extraneous (turns at the end of runs) sections. This resulted in geographical coordinates for all raw resistivity, water temperature and depth values, thereby, creating a spatial representation of the subsurface’s apparent resistivity along the track. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Christopher G Smith
    Research Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    cgsmith@usgs.gov
    Date: 2017 (process 4 of 5)
    EarthImager 2D, a two-dimensional inversion modeling software (registered trademark, AGI), was used to interpret this data. Because the apparent resistivity values do not account for differences in salinity and geology, EarthImager 2D combines all information to create a tri-panel figure for analytic purposes. The top panel displays raw resistivity data, the middle panel displays the model EarthImager 2D creates to best explain the raw data, while the bottom panel displays the modeled resistivity, accounting for salinity and geologic parameters. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Christopher G. Smith
    Research Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    cgsmith@usgs.gov
    Date: 13-Oct-2020 (process 5 of 5)
    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?
    Advanced Geosciences, Inc., 2006, The SuperSting with Swift automatic resistivity and IP system Instruction Manual.

    Online Links:

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

  1. How well have the observations been checked?
    The positional accuracy of the survey tracklines was determined by the accuracy of the boat-mounted Lowrance HDS5 receiver, while the accuracy of the resistivity data was determined by the recording device, a SuperSting R8/IP (registered trademark) produced by Advanced Geosciences, Inc., Austin, TX). The manufacturer’s tolerance for the SuperSting is better than 1% of readings, in most cases (lab measurements). Field measurement accuracy depends on ground noise and resistivity. The instrument will calculate and display a running estimate of measuring accuracy. Testing has shown that the positional accuracy for the Lowrance is ~1 m.
  2. How accurate are the geographic locations?
    The horizontal accuracy of the sample locations was determined by the accuracy of the boat-mounted Lowrance HDS5 unit used to record the positional data of the boat during the data collection process. Testing has shown that the positional accuracy for the Lowrance is ~1 m.
  3. How accurate are the heights or depths?
    The only vertical measurements incorporated into the data files are the water depth measurements, measured by the boat-mounted Lowrance HDS5 transducer, with a resolution of 10 cm.
  4. Where are the gaps in the data? What is missing?
    This dataset includes the locations of 17 tracks run on five latitudinal transects at the Eau Gallie North site on the western shore of the central section of Indian River Lagoon, FL.
  5. How consistent are the relationships among the observations, including topology?
    This dataset contains the raw STG and GPS data files produced by the boat-mounted Lowrance and the Supersting (AGI) resistivity device.

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:
The U.S. Geological Survey requests that it be acknowledged as the originator of this dataset in any future products or research derived from these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
    Attn: Christopher G. Smith
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    cgsmith@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable data
  3. What legal disclaimers am I supposed to read?
    This 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, or for general or scientific purposes, 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?
  5. What hardware or software do I need in order to use the data set?
    The data tables for USGS FANs 2016-369-FA and 2017-306-FA were created in Microsoft Excel 2010 and can be opened using Microsoft Excel 2007 or higher; these data may also be viewed using the free Microsoft Excel Viewer (http://office.microsoft.com/). The data tables are also provided as comma-separated values text files (.csv).

Who wrote the metadata?

Dates:
Last modified: 13-Oct-2020
Metadata author:
U.S. Geological Survey
Attn: Christopher G. Smith
Research Geologist
600 4th Street South
St. Petersburg, FL
USA

727-502-8000 (voice)
cgsmith@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/Metadata-IRL.faq.html>
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