Geophysical (TDEM) delineation of a shallow brine beneath a fresh-water lake, the Sea of Galilee, Israel
Shaul Hurwitz, Mark Goldman, Mikhail Ezersky and Haim Gvirtzman


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figure1The Sea of Galilee is a fresh-water lake, into which saline water emerges through onshore and offshore springs and through flux from the lake's sediments. The novel surface marine modification of the TDEM (Time Domain Electromagnetic) method was used to map the spatial distribution of brines in the sediments below the lake.figure2 Results indicate that electrical resistivities of 1.0 and 0.5 ohm-m are detected at depths of about 10 m below the lake bottom in most of the lake area, which are equivalent to approximately 11,000 and 22,000 mgCl/l, respectively. Relatively fresh groundwater was detected beneath most of the shoreline. Faulting controls the vertical interfaces between saline and fresh groundwaters. figure3It is hypothesized that salt transport is dominated by molecular diffusion in the central part of the lake and by advection from regional aquifers in the margins.

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