• SEAWAT Model of Flow and Chloride Transport in the "1,500-Foot", "2,400-Foot", and "2,800-Foot" Sands of the Baton Rouge Area, Louisiana

    Metadata Updated: August 16, 2020

    An updated three-dimensional, groundwater-flow and chloride-transport model (SEAWAT) of the Southern Hills regional aquifer system in southeastern Louisiana and southwestern Mississippi was developed to examine the effects of groundwater withdrawals on the rate and pathways of saltwater migration in the “1,500-foot” sand, “2,400-foot” sand, and “2,800-foot” sand. New interpretations of stratigraphic correlations amongst geophysical well logs were utilized to revise a hydrogeologic-framework that delineates the depth and thickness variations of aquifers and confining units in the Southern Hills regional aquifer system. Regional groundwater flow throughout the Southern Hills regional aquifer system was first simulated with MODFLOW, and flow-model parameters were calibrated to 8,810 water levels observed through 2016 with the parameter-estimation code PEST++. Saltwater transport was subsequently simulated for the “1,500-foot” sand, “2,400-foot” sand, and “2,800-foot” sand with the variable-density code, SEAWAT. Chloride-concentration measurements were used as a proxy for the saltwater to formulate the concentration initial conditions and calibrate the transport-model parameters. Three hypothetical groundwater management scenarios are included in the archive. These scenarios simulate the future water levels and chloride concentrations within the “1,500-foot” sand, “2,400-foot” sand, and “2,800-foot” sand if groundwater withdrawals were to continue at 2016 rates or if one of two proposed modifications to the 2016 withdrawals from the “1,500-foot” sand or “2,800-foot” sand were to be enacted. The model was calibrated to water levels measured in aquifers beneath the “400-foot” sand, and water levels simulated in these aquifers could be used for various purposes, including predicting the effects of changing pumping rates. Water planners and managers need additional knowledge about the effects of groundwater withdrawals on the rate and pathways of saltwater migration and a tool to assess possible management strategies that could control further saltwater encroachment in the Baton Rouge area. This USGS data release contains all of the input and output files for the simulations described in the associated model documentation report (https://doi.org/10.3133/sir20195102).

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    Dates

    Metadata Date July 31, 2019
    Metadata Created Date August 16, 2020
    Metadata Updated Date August 16, 2020
    Reference Date(s) January 1, 2019 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from USGS-Harvest

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    Image of the model domain and active area of the model.

    Additional Metadata

    Resource Type Dataset
    Metadata Date July 31, 2019
    Metadata Created Date August 16, 2020
    Metadata Updated Date August 16, 2020
    Reference Date(s) January 1, 2019 (publication)
    Responsible Party Southeast Region (Point of Contact)
    Contact Email
    Access Constraints Use Constraints: none, Access Constraints: None. Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from this data release.
    Bbox East Long -90.447555
    Bbox North Lat 31.337561
    Bbox South Lat 30.242934
    Bbox West Long -91.915925
    Coupled Resource
    Frequency Of Update notPlanned
    Graphic Preview Description Image of the model domain and active area of the model.
    Graphic Preview File https://water.usgs.gov/GIS/browse/sir2019-5102Thumbnail.jpg
    Graphic Preview Type jpg
    Guid
    Harvest Object Id 5610b209-8a06-4e27-8727-895db995681e
    Harvest Source Id 00f54869-3a43-480d-a67c-0ba115f5d739
    Harvest Source Title USGS-Harvest
    Licence The data have been approved for release by the U.S. Geological Survey (USGS). Although the data have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, the data are released on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from authorized or unauthorized use. Although the data, software, and related material have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
    Metadata Language
    Metadata Type geospatial
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 1940-01-01
    Temporal Extent End 2016-12-31

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