Hydrogeophysical Assessment of Wadi El-Sheikh Aquifer, Saint Katherine, South Sinai, Egypt

Abstract

Over the last few years, Saint Katherine, South Sinai has seen large scale development in connection with building new cities, land reclamation, and tourism. The Wadi El-Sheikh aquifer constitutes one of the major freshwater recourses in the Saint Katherine area. In that regard, ten Schlumberger vertical electrical soundings (maximum [Formula: see text]) associated with a number of measured and∕or calculated geoelectric and petrophysical parameters of the aquifer were conducted to delineate and assess the aquifer. Furthermore, subsurface stratigraphic data and measured hydrological parameters of shallow boreholes in the study area were integrated with the geoelectrical results. The integration of the sounding results, borehole data, and geoelectric and petrophysical parameters effectively delineated the alluvial fresh water aquifer with true resistivities ranging between 206 and [Formula: see text] and thickness ranging between 32 and [Formula: see text]. The northern part is characterized by a gradual decrease in porosity, electrical anisotropy coefficient, and total dissolved solid (TDS) concentrations. On the other hand, the northern part is characterized by a gradual increase in grain size, tortuosity, permeability, and transmissivity reflecting high aquifer potential. Moreover, the downward gravitational movement of groundwater is greater in the northern direction as well. Based on these findings, deep wide-spaced development water wells ([Formula: see text] depth) are recommended to be drilled in the northern area.

Evaluation of Groundwater Potentials for Borehole Drilling by Integrated Geophysical Mapping of Auchi-South Western Nigeria Using Very Low Frequency Electromagnetic Profiling (VLF-EM) and Vertical Electrical Sounding (VES)

“…Freely available MATLAB-based software (Sundarajan et al; 2011) was used to process the measured components of the VLF-EM data. The filtered real data anomaly inflections appear as peak positive anomalies and false VLF anomaly inflections as negative anomalies of the profiles (Adiat et al;2009). Subsequently the filtered real in addition to the filtered imaginary data was plotted against distance to generate the VLF-EM profiles.…”

“…The Very Low Frequency Electromagnetic (VLF-EM) is an effective tool in mapping conductive fault and fracture zones, while resistivity method is used for detecting groundwater presence and differentiating sub surface layers. Electromagnetic and electrical methods have been widely used in groundwater investigations because of good correlation between electrical properties, geological (composition) and fluid content (Olayinka et al;2004, Khali, 2009Jayeoba and Oladunjoye, 2013;Chinyem et al;2014;Taiwo et al;2016). In this present study, Very Low…”

Geoelectric investigation to delineate groundwater potential and recharge zones in Suki river basin, north Maharashtra

“…The above-mentioned parameters introduce the concept of anisotropy (λ), where the block of layers as one unit behaves like an anisotropic medium characterized by the longitudinal and transverse resistivities (Maillet 1947;Khalil 2009). The values of electrical anisotropy (λ), as shown in table 2, ranges from 0.5 (VES 17) to 3.0 (VES 11) with an average of 1.21 in the study area and its distribution is shown in figure 3(e).…”

“…Khalil (2009) observed that when the longitudinal, transverse and mean resistivities differ, then the change in resistivity is dependent on the direction of groundwater flow and the influence of lithological variation. These three types of resistivity values are different in layered anisotropic sediments (Mazac et al 1985;Ayolabi et al 2010).…”

Aquifer assessment for agriculture through geophysical, hydrochemical and hydrogeological approaches around Perumattunallur lake, Southern India

“…So groundwater mapping is an essential part of the selected site due to the irrigation and agriculture. The latest trends of the aquifer mapping study have been carried out by hydrogeologist and geophysicists (Griffiths and Barker1993;Mondal et al 2008aMondal et al , b, 2009Khalil 2009;Aizebeokhai 2010;Selvam et al 2014). The geophysical study such as electrical resistivity imaging technique is used to estimate the vertical and horizontal changes of subsurface structural changes without any disturbance.…”