Abstract
Vertical electrical soundings (VESs) in a coastal area of NW Egypt are used for evaluating the hydrogeological and structural characteristics of the subsurface sequence to a depth of about 200 m below the ground surface. Interpretation of these soundings indicates the presence of a shallow brackish to fresh water bearing limestone aquifer of Pleistocene age, and a deep saline water bearing sandy limestone of Miocene age. The TDS of the analyzed groundwater samples indicate invasion of the Mediterranean seawater into the Pleistocene aquifer and into the deeper aquifers which have direct contacts with it. The denser saline water penetrates inland below the fresh water body in the shallow Pleistocene aquifer. The fresh/saline water interface in this aquifer deepens southward, giving rise to an increasingly large fresh water body in this direction. However, subsurface structural (faulting) complexities are detected, which influenced the entire sedimentary section in the study area and led to strong lateral and vertical variations in the distribution of the subsurface lithological units. Recommendations concerning site-selection for drilling productive water wells are given.
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