Mapping of the boundaries between freshwater and saltwater was helpful in surface resistivity surveys because of the high electric conductivity of saltwater relative to freshwater. A total of 30 electrical soundings were measured to configurate the seawater intrusion. Accordingly, two zones of groundwater quality were delineated: the slightly freshwater zone in the southern part, with resistivity range of 15–90 Ω m, and the brackish water to saltwater zone, with a very low resistivity of <2 Ω m in the northwestern parts. In addition to tracing the freshwater-seawater contact zone, three geoelectric layers were detected. The surface layer composed of sand, clay, and silt. Its resistivity ranges from 5 to 512 Ω, and the thickness varies from 1 to 25 m. The aquifer layer is composed of sand with intercalations of clay with resistivity ranging from 15 to 90 Ω m and thickness from 25 to 120 m. The clay layer resistivity ranges from 2 to 15 Ω m and thickness from 2 to 69 m.
CITATION STYLE
Salem, Z. E., & Osman, O. M. (2019). Use of geoelectrical resistivity to delineate the seawater intrusion in the northwestern part of the nile delta, Egypt. In Handbook of Environmental Chemistry (Vol. 73, pp. 425–459). Springer Verlag. https://doi.org/10.1007/698_2017_175
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