GEOELECTRIC RESISTIVITY SOUNDING FOR GROUNDWATER EVALUATION: TWO FIELD EXAMPLES. | ||||
| Journal of Egyptian Geophysical Society | ||||
| Volume 2, Issue 1, 2024, Page 61-68 PDF (984.79 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jegs.2024.374758 | ||||
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| Authors | ||||
| Yehia E. Abdelhady; Essam A. Morsy; Sherif M. Hanafy | ||||
| Geophysics Dept., Faculty of Science, Cairo University | ||||
| Abstract | ||||
| Geoelectric resistivity technique is applied in two different areas in Egypt to detect and evaluate the quality of subsurface groundwater aquifers. As it is well known the higher the resistivity values the lower the salinity and the better the water quality for agricultural purposes. In the first field example (New Qena city) 10 VES stations are conducted using Schlumberger array. The subsurface column consists of 5 resistivity layers. The first layer is a surface layer composed of very dry wadi deposits, followed by an intercalation layer of gravel and coarse sand, then a dry gravely sandstone, and a saturated sandstone layer, then an impermeable clayey sandstone. The aquifer is represented by the fourth layer with a thickness ranging between 48–62m at depth of 28–39m at the northern part and 5–32m at the southern part of the area. The absence of the aquifer at the northeastern part is attributed to faulting. The aquifer resistivity decreases towards the southern part of the area due to the increasing saline content and increasing distance from the river Nile (main recharging source). In the second field example (El-Khatatba area) a total of 6 Schlumberger VES stations are conducted in the area. The interpretation of the conducted data yields 5 subsurface layers, a thin surface dry loose sands, a coarse sand-gravel layer, a compacted sand layer, a saturated sandstone layer (represents the aquifer), and a saturated sandstone layer with lower resistivity values due to higher saline content. The thickness of the aquifer is 8–69m, while its average depth is 68m. | ||||
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