Groundwater Potential Assessment Using Vertical Electrical Sounding and Magnetic Methods: A Case of Adilo Catchment, South Nations, Nationalities and Peoples Regional Government, Ethiopia

Abstract

Vertical electrical sounding and magnetic methods were carried out to assess groundwater potential in Adilo catchment, Kembata Tembaro Zone, South Nations, Nationalities and Peoples Regional Government, Main Ethiopian Rift. The data were acquired from eight VES points using Schlumberger electrode arrays with maximum half current electrode spacing ( AB / 2 = 500 ) and 253 magnetic data points were analyzed. The qualitative analysis of VES data was accomplished by using curves, apparent resistivity, and pseudodepths, and the quantitative interpretations of the VES data were constructed by the VES data using IPI-Res3, IPI2Win, and surfer software and constructing geoelectric section along with profiles and lithological information from the borehole and Geosoft interpretation was used for magnetic data. The VES results of the data revealed five geoelectric layers which differ in degree of fracturing, weathering, and formation. The upward continued magnetic field map anomaly to 560 m illustrated northwestern to the southwest; areas have a low magnetic anomaly. Examining the potential aquifer of profile one’s geoelectric section, the horizons of layer four were better potential aquifers as the highly fractured and weathered ignimbrite zone of layer five of VES13 was 219 m deeper than the depths of the other VES points, and along with profile two geoelectric sections, the horizon of layer four VES23 layer five has the lowest resistivity with large thickness at a depth of 253 m. Thus, the low resistivity and the large thickness of these formations are an indication of the high yield of groundwater potential in the study area.

Groundwater Potential Assessment Using Integrated 2D and 3D Electrical Tomography and 2D Gravity Modeling: A Case Study of the Burka Uke Catchment, West Ethiopia.

“…14 and 16 show a t error of 0.175% between the estimated and measured gravity values. This residual gravity pro le anomaly varies from 0.1 to -1.2 mGal, and cross-section B-B' is approximately 0-750 m long and 150 m deep.…”

Groundwater Potential Assessment Using Integrated 2D and 3D Electrical Tomography and 2D Gravity Modeling: A Case of Burka Uke Catchment, West Ethiopia

“…Delineating and characterizing the complex underlying structures of the earth has become increasingly dependent on the use of advanced geophysical techniques in recent times. With this new method, key zones such as the saturated and unsaturated zones, as well as water tables at different depths, will be precisely identified by using the physical characteristics of subsurface layers to define the vertical profiles (Araffa et al, 2015(Araffa et al, , 2019(Araffa et al, , 2023Awad & Araffa, 2013;Bayewu et al, 2018;Fajana, 2020;Hasan et al, 2019;Manu et al, 2019;Markos et al, 2021;Mohamed et al, 2022;Ranyah et al, 2023;Rolia & Sutjiningsih, 2018;Sultan & Santos, 2011;Lamessa, 2013).…”