Entry from Directory of Selected Israeli Water-related Publications

TITLE:	Mapping of seawater intrusion into the coastal aquifer by electromagnetic methods (Time Domain Electromagnetic) Hydro Report 1990/4 IPRG Report 843/132/89
AUTHORS:	D. Gilad, M. Goldman, A. Melloul, A. Ronen
PUBLISHER:	Hydrological Service and The Institute for Petroleum Research
PAGES:	30 + figures, tables and lithologic logs
PUBLICATION DATE:	July 1990
LANGUAGE OF PUBLICATION:	Hebrew with English abstract
ABSTRACT:	An extensive TDEM survey, which covered almost the whole mediterranean coastal area of Israel, was carried out during the summer of 1989 in order to make a quantitative evaluation of the TDEM method as a tool for detecting seawater intrusion into the coastal aquifer of Israel. To obtain an estimation of the statistical significance of the results, a total of 100 TDEM stations was established, some in close proximity of existing observation wells. In order to ensure an objective evaluation of the TDEM results, a prior data interpretation was carried out without using any geological or hydrological information from the wells. It was found that the resistivity values of seawater in the aquifer vary within a narrow range of 1.1 to 2.9 Ohm-m, whereas low resistivity lithologies have values not lower than 10 Ohm-m. Of 31 TDEM measurements which detected seawater intrusion and which could be quantitatively compared with borehole data, 26 showed a good to fair agreement. Out of five TDEM measurements which did not detect seawater intrusion, four were found to be correct by comparison with data from nearby observation wells.
ADDRESS FROM WHICH THE PUBLICATION CAN BE OBTAI:	Library, Hydrological Service, P.O.Box 6381, Jerusalem 91063, Israel
AVAILABILITY:	Out of print. Available for reading in the library only.

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