• Find People
  • Campus Map
  • PiratePort
  • A-Z
    • About
    • Submit
    • Browse
    • Login
    View Item 
    •   ScholarShip Home
    • Academic Affairs
    • Thomas Harriot College of Arts and Sciences
    • Geological Sciences
    • View Item
    •   ScholarShip Home
    • Academic Affairs
    • Thomas Harriot College of Arts and Sciences
    • Geological Sciences
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of The ScholarShipCommunities & CollectionsDateAuthorsTitlesSubjectsTypeDate SubmittedThis CollectionDateAuthorsTitlesSubjectsTypeDate Submitted

    My Account

    Login

    Statistics

    View Google Analytics Statistics

    Source of saltwater intrusion in the Castle Hayne aquifer on the western part of Bogue Banks barrier island, North Carolina

    Thumbnail
    View/ Open
    Szynal_ecu_0600O_11307.pdf (9.348Mb)

    Show full item record
    Author
    Szynal, David
    Abstract
    Saltwater intrusion is occurring in the confined Castle Hayne aquifer on the western part of the east-west trending barrier island of Bogue Banks, North Carolina. Of eleven municipal wells that are solely screened in the Castle Hayne aquifer on the central and western parts of the island, three wells withdraw water with elevated chloride levels that exceed the drinking water standards of the United States Environmental Protection Agency. The wells on the western side of the island have the highest chloride levels (>1,700 mg/L), whereas the levels progressively decrease in the wells to the east (<250 mg/L). Because the Castle Hayne aquifer is the sole source of potable water on the island, a reverse osmosis plant was built on the western part of the island to address elevated chloride concentrations in the potable water source. Despite this development, the underlying source of saltwater intrusion into the Castle Hayne aquifer is still not well known. Therefore, the goal of this study was to determine the source of saltwater intrusion in the Castle Hayne aquifer on the western part of Bogue Banks. Borehole logs, seismic profiles, vibracore, and ground penetrating radar data collected by other researchers were used to design a three dimensional multi-layered, multi-density groundwater flow model using visual MODFLOW. The model was used in conjunction with chloride and long-term water level records to test the hypotheses that the source of saltwater intrusion into the Castle Hayne aquifer is from surface waters surrounding the island and/or a paleochannel underlying the island. Results from modeling suggest that saltwater emanating from surface waters surrounding the island is being drawn into municipal wells and not from the paleochannel underlying the island. The model suggests that brackish surface waters from Bogue Sound migrate downwards through overlying aquifers into the Castle Hayne aquifer. The major driver of the migration is groundwater withdrawal from the municipal wells on the western part of the island. Understanding how groundwater withdrawals impact the migration of saltwater in the Castle Hayne aquifer arms water managers with the knowledge to better safeguard the major source of potable water on the island for future generations.  
    URI
    http://hdl.handle.net/10342/4655
    Subject
     Hydrologic sciences; Barrier islands; Castle Hayne Aquifer (N.C.); Groundwater modeling; Saltwater intrusion; SEAWAT 
    Date
    2014
    Citation:
    APA:
    Szynal, David. (January 2014). Source of saltwater intrusion in the Castle Hayne aquifer on the western part of Bogue Banks barrier island, North Carolina (Master's Thesis, East Carolina University). Retrieved from the Scholarship. (http://hdl.handle.net/10342/4655.)

    Display/Hide MLA, Chicago and APA citation formats.

    MLA:
    Szynal, David. Source of saltwater intrusion in the Castle Hayne aquifer on the western part of Bogue Banks barrier island, North Carolina. Master's Thesis. East Carolina University, January 2014. The Scholarship. http://hdl.handle.net/10342/4655. February 27, 2021.
    Chicago:
    Szynal, David, “Source of saltwater intrusion in the Castle Hayne aquifer on the western part of Bogue Banks barrier island, North Carolina” (Master's Thesis., East Carolina University, January 2014).
    AMA:
    Szynal, David. Source of saltwater intrusion in the Castle Hayne aquifer on the western part of Bogue Banks barrier island, North Carolina [Master's Thesis]. Greenville, NC: East Carolina University; January 2014.
    Collections
    • Geological Sciences
    • Master's Theses
    • North Carolina Collection
    Publisher
    East Carolina University

    xmlui.ArtifactBrowser.ItemViewer.elsevier_entitlement

    East Carolina University has created ScholarShip, a digital archive for the scholarly output of the ECU community.

    • About
    • Contact Us
    • Send Feedback