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Groundwater Vulnerability Modeling to Assess Seawater Intrusion: a Methodological Comparison with Geospatial Interpolation

Author

Listed:
  • N. Momejian

    (American University of Beirut
    Queen’s University)

  • M. Abou Najm

    (American University of Beirut
    University of California)

  • I. Alameddine

    (American University of Beirut)

  • M. El-Fadel

    (American University of Beirut)

Abstract

Seawater intrusion has become a growing threat in coastal urban cities due to overexploitation of groundwater. This study examines the accuracy of the commonly used geospatial quality assessment models (GQA) and groundwater vulnerability assessment models (GVA) in determining the extent of seawater intrusion in urban coastal aquifers. For that purpose, interpolation methods (kriging, IDW and co-kriging) and vulnerability assessment models (DRASTIC, EPIK) were compared using groundwater salinity criteria (TDS, Cl−) collected at three pilot areas along the eastern Mediterranean (Beirut, Tripoli, Jal el Dib). The results showed that while the GIS-based interpolation methods and the vulnerability assessment models captured elements of the groundwater quality deterioration, both had a limited ability to accurately delineate saltwater intrusion. This emphasizes that while interpolation methods and conventional vulnerability models may give general information about groundwater quality, they fail to capture the status of the aquifer at a finer spatial resolution.

Suggested Citation

  • N. Momejian & M. Abou Najm & I. Alameddine & M. El-Fadel, 2019. "Groundwater Vulnerability Modeling to Assess Seawater Intrusion: a Methodological Comparison with Geospatial Interpolation," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 33(3), pages 1039-1052, February.
    • Handle: RePEc:spr:waterr:v:33:y:2019:i:3:d:10.1007_s11269-018-2165-4
    DOI: 10.1007/s11269-018-2165-4
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    References listed on IDEAS

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    1. M. Moujabber & B. Samra & T. Darwish & T. Atallah, 2006. "Comparison of Different Indicators for Groundwater Contamination by Seawater Intrusion on the Lebanese Coast," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 20(2), pages 161-180, April.
    2. M. El-Fadel & M. Tomaszkiewicz & Y. Adra & S. Sadek & M. Abou Najm, 2014. "GIS-Based Assessment for the Development of a Groundwater Quality Index Towards Sustainable Aquifer Management," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 28(11), pages 3471-3487, September.
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