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    • EK80 Water Column Sonar Data Collected During BordelonMC20

    Metadata Updated: September 17, 2021

    One overnight survey of the seep was performed in order to determine the flow rate of hydrocarbons in the watercolumn using a vessel mounted broadband echo sounder and ADCP. The echo sounder and ADCP were mounted on a pole on the port side of the Gerry Bordelon. ADCP surveys were performed in order to determine the magnitude and direction of flow in the area and then broadband acoustic surveys were performed. The broadband acoustic suverys were performed in two parts: the across seep surveys and the along seep surveys. The across seep surveys were performed first and were used to determine the position of the seep as it transitted downstream of the source. That position was then used to inform the location of along seep surveys in which the entire seep, from source to surface was visualized.

    All times UTC

    0120-0136 Preliminary ADCP survey. Track lines are run perpendicular to the nomial direction of flow to the southwest of the seep source (downstream of the seep) and northeast of the source (upstream of the seep). Flow is nominally to the northeast.

    0227 - 0652 Across-seep echo sounder surveys. Track lines are run perpendicular to the nomial direction of the flow starting from downstream of the downed platform and moving downstream. Lines were approximately 1 km long with spacing approximately 50 m. Once the seep was no longer detected in the across seep survey lines, the survey was repeated moving back from upstream to downstream.

    0704-0838 Along-seep echo sounder surveys. The position of the seep determined in the across-seep survey lines was used to inform the survey lines run in the direction of flow. These lines were used to ensonify the entire seep in a single pass from origin to the surface.

    0848-0921 Second ADCP survey.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date September 14, 2021
    Metadata Created Date November 12, 2020
    Metadata Updated Date September 17, 2021
    Reference Date(s) September 20, 2017 (creation), September 14, 2020 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NGDC MGG Sonar Water Column

    Other Data Resources

    Additional Metadata

    Resource Type Series
    Metadata Date September 14, 2021
    Metadata Created Date November 12, 2020
    Metadata Updated Date September 17, 2021
    Reference Date(s) September 20, 2017 (creation), September 14, 2020 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ngdc.mgg.wcd:BordelonMC20_EK80
    Access Constraints Cite as: Scott Loranger and Thomas Webber, University of New Hampshire. 2017. 'EK80 Water Column Sonar Data Collected During BordelonMC20'. NOAA National Centers for Environmental Information. doi:10.25921/910v-v249 [access date], Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives., Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose., Resource may not be available for up to one year after initial collection.
    Bbox East Long -88.96406
    Bbox North Lat 28.94182
    Bbox South Lat 28.93306
    Bbox West Long -88.97396
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id 6a3b8d09-47cb-4285-929a-5f2e3ee3ef18
    Harvest Source Id ab8b0290-e4db-4a00-89f2-4e427c2054b2
    Harvest Source Title NGDC MGG Sonar Water Column
    Licence These data are considered raw and have not been subjected to the NOAA's quality control or quality assurance procedures. They are released for limited public use as preliminary data to be used only with appropriate caution. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty., Not subject to copyright protection within the United States.
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-88.97396, 28.93306], [-88.96406, 28.93306], [-88.96406, 28.94182], [-88.97396, 28.94182], [-88.97396, 28.93306]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2017-09-24T04:25:02
    Temporal Extent End 2017-09-24T08:37:55

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