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Delineation of Subsea Freshwater Extension by Marine Geoelectromagnetic Soundings (SE Mediterranean Sea)

Author

Listed:
  • Eldad Levi

    (University of Haifa
    The Geophysical Institute of Israel)

  • Mark Goldman
  • Gideon Tibor

    (University of Haifa
    Israel Oceanographic and Limnological Research)

  • Barak Herut

    (University of Haifa
    Israel Oceanographic and Limnological Research)

Abstract

This study presents a novel application of marine geoelectromagnetic technique, in an attempt to delineate freshwater extension of the coastal sub-aquifers beneath the SE Mediterranean Sea, along central Israel. The novel marine Ex-Bz time domain electromagnetic (TDEM) geophysical method was applied, demonstrating high sensitivity to the presence of sub-seafloor electrically resistive structures up to several kilometers offshore (shallow marine environment). The study included 19 marine measurements located offshore between Ashdod in the south to Tel-Aviv in the north, where a previous onshore study detected fresh groundwater below seawater intrusion at the coast line. The offshore measurements were conducted to distances of up to 3 km from the shoreline. It was found that the lower sub-aquifer contains fresh groundwater (resistivity >10 Ω-m) to a distance of 2.8 km offshore along the 30 km strip, and is probably constrained by lateral geo-facial changes.

Suggested Citation

  • Eldad Levi & Mark Goldman & Gideon Tibor & Barak Herut, 2018. "Delineation of Subsea Freshwater Extension by Marine Geoelectromagnetic Soundings (SE Mediterranean Sea)," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 32(11), pages 3765-3779, September.
    • Handle: RePEc:spr:waterr:v:32:y:2018:i:11:d:10.1007_s11269-018-2018-1
    DOI: 10.1007/s11269-018-2018-1
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    References listed on IDEAS

    as
    1. Vincent E.A. Post & Jacobus Groen & Henk Kooi & Mark Person & Shemin Ge & W. Mike Edmunds, 2013. "Offshore fresh groundwater reserves as a global phenomenon," Nature, Nature, vol. 504(7478), pages 71-78, December.
    2. N. Amir & U. Kafri & B. Herut & E. Shalev, 2013. "Numerical Simulation of Submarine Groundwater Flow in the Coastal Aquifer at the Palmahim Area, the Mediterranean Coast of Israel," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 27(11), pages 4005-4020, September.
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