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

Eldad Levi, Mark Goldman, Gideon Tibor, Barak Herut

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)3765-3779
Number of pages15
JournalWater Resources Management
Volume32
Issue number11
DOIs
StatePublished - 1 Sep 2018

Bibliographical note

Funding Information:
Acknowledgements The research was funded by the German Ministry of Education and Research (BMBF) and by the Israeli Ministry of Science, Culture and Sport (MOST), project number WT0804/GR2138 and by the Israeli Ministry of Energy. The 2-D calculations were carried out using the 3-D SLDM code written by Vladimir Druskin and Leonid Knizhnerman. Our special thanks to Uri Kafri for inspiring the research and to Alex Zaharkin for operating the Cycle-5 M system.

Funding Information:
The research was funded by the German Ministry of Education and Research (BMBF) and by the Israeli Ministry of Science, Culture and Sport (MOST), project number WT0804/GR2138 and by the Israeli Ministry of Energy. The 2-D calculations were carried out using the 3-D SLDM code written by Vladimir Druskin and Leonid Knizhnerman. Our special thanks to Uri Kafri for inspiring the research and to Alex Zaharkin for operating the Cycle-5?M system. ? The use of marine electromagnetic measurements for hydrological purposes. ? Delineating submarine fresh water extension in the SE Mediterranean Sea. ? Mapping subsea fresh water sub-aquifers. None.

Publisher Copyright:
© 2018, Springer Science+Business Media B.V., part of Springer Nature.

Keywords

  • Coastal aquifer
  • Electromagnetic
  • Groundwater
  • Hydrogeophysics
  • Hydrology
  • Resistivity
  • Salinity
  • Seawater

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology

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