Abstract

Nuweiba is one of Egypt's strategic marine harbors and tourist sites located on the western coast of the Gulf of Aqaba. The absence of freshwater resources in Nuweiba necessitates investigations of local groundwater aquifers. Determination of the hydro-geophysical parameters of the Nuweiba alluvial fan constitutes the basic foundation for optimizing groundwater exploitation over time. Fifteen Schlumberger vertical electrical soundings (maximum AB/2  =  1,001.5 m), augmented by borehole stratigraphic data, aquifer tests, hydro-chemical analysis, and numbers of measured and/or calculated hydraulic parameters, were carried out in the study area. The fresh to brackish aquifer of Quaternary and pre-Quaternary alluvium sediments was effectively delineated with true resistivity and thickness ranges of 93–125 ohm-m and 0.5–4.5 m, respectively.

The western part of the aquifer has a large volume of fresh ground water for extraction and is characterized by a gradual increase in thickness (4.5 m), grain size, transmissivity (174–255 m2/d), and a possible decrease in total dissolved solids levels (3,100 ppm) and electrical anisotropy (1.10–1.11). Porosity (30.3–30.4%), tortuosity (1.348), formation factor (6) and hydraulic conductivity (58 m/d) are essentially constant across the aquifer. The measured storativity of the aquifer is 2.75 × 10−2, which is in accordance with the typical value of the unconfined aquifer at shallow depths.

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