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Delineation of a fractured granite aquifer in the Alwadeen area, Southwest Saudi Arabia using a geoelectrical resistivity survey

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Abstract

In most areas of the Arabian Shield, the local people meet their water needs through shallow dug wells in fractured basement rocks where groundwater is commonly less polluted and economic; this means that groundwater exploration has therefore become a major concern. The present study uses integrated 1D and 2D geoelectrical resistivity surveys to delineate and detect the groundwater potential of the granitic rocks in the Alwadeen area in Khamis Musheet city, southwest Saudi Arabia. The 1D resistivity survey was conducted through 17 vertical electrical soundings (VES) distributed in the study area, using Schlumberger array and current electrode separations up to 500 m. In addition, eight 2D resistivity tomography traverses were acquired using Iris Syscal Pro resistivity imaging system with 5 m spaced 72 electrodes and dipole–dipole configuration. The inspection of the VES curves revealed the presence of four distinct geoelectrical resistivity layers characterizing the area. These layers start with the topmost layer of unconsolidated alluvium deposits that is characterized by a wide range of resistivities (3 to 340 Ω.m) and a thickness of up to 5 m. This wide range in resistivity is associated with variations in the lithology and humidity of the layer. The resistivity of the second and third geoelectrical resistivity layers is changed spatially and is characterized by elongated zones of low resistivities (around 100 Ω.m), indicating fractured and weathered granite freshwater aquifer. The values and distribution of the resistivities along the geoelectrical sections indicate that the fractured granitic rocks are separated by highly resistive massive granitic blocks. The vertical and horizontal variations in the resistivity can be related to the degree of weathering and fracturing of the granitic rocks and hence to its water saturation.

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Acknowledgments

The authors would like to extend their sincere appreciation to the Deanship of Scientific Research at King Saud University for funding this research group No. RG-1435-035.

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Authors and Affiliations

  1. Department of Geology and Geophysics, College of Science, King Saud University, Riyadh, Saudi Arabia

    Sattam Almadani, Elkhedr Ibrahim, Abdullah Al-Amri, Mohammed Fnais & Kamal Abdelrahman

  2. Seismology Department, National Research Institute of Astronomy and Geophysics, Cairo, Egypt

    Kamal Abdelrahman

Authors
  1. Sattam Almadani
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  2. Elkhedr Ibrahim
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  3. Abdullah Al-Amri
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  4. Mohammed Fnais
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  5. Kamal Abdelrahman
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Correspondence to Sattam Almadani.

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Editorial handling: Li Zhen Cheng

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Almadani, S., Ibrahim, E., Al-Amri, A. et al. Delineation of a fractured granite aquifer in the Alwadeen area, Southwest Saudi Arabia using a geoelectrical resistivity survey. Arab J Geosci 12, 449 (2019). https://doi.org/10.1007/s12517-019-4646-z

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  • DOI: https://doi.org/10.1007/s12517-019-4646-z

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