Groundwater investigation through vertical electrical sounding at hilly area from Nooriabad toward Karachi
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The study is conducted to focus on the subsurface geological and hydrological mapping for groundwater presence in the area located Nooriabad of the Jamshoro district left side of M-9 Motorway toward Karachi, Sindh, Pakistan. Vertical electrical sounding (VES) is carried out by using the Schlumberger electrode array method with ranging from 02 to 300 m. IPI2win software is used on the collected data of VES to interpret with qualitatively that indicated the four distinct lithological units demarcated as clay, sandy clay, shale and alluvium or weathered layer of Tiyon formation and limestone and fractured sandstone beds of the Laki formation of Eocene age. On the collected VES data, it is concluded that the first and second layer of soil is 16 m thick and composed of shale to clay beds and alluvium having the apparent resistivity between 05 and 15 Ωm. With increasing depth from 50 to 100 m, it is interpreted that there are fractured sandstone and limestone beds with average resistivity ranges between 15 to 60 Ωm. Further, processed the data and generated pseudo-section, apparent resistivity section and statistical curve by using software IPI2win to interpret the apparent resistivity map at 50, 60, 70 and 80 m are correlated with the hydrogeology and geology of the area. The results are interpreted that the good aquifer zones are present in the 50–100-m-thick limestone and fractured sandstone beds having interconnection with clay. Accumulation of groundwater is found by controlling the physiography and geological structure of the study area.
KeywordsGeo-electrical section Aquifers Lithology Resistivity section VES Groundwater
Authors are thankful to PCRWR, Tandojam, and Center for Pure and Applied Geology, University of Sindh, Jamshoro, for providing and supporting the technical assistance during the survey. Authors also would like to acknowledge with special thanks Dr. Maya Silver – Professor, University of Utah, Salt Lake City, USA, who paid special time for this manuscript editing and anonymous reviewers of Acta Geophysica for their useful comments and suggestions, which led me enhancing the quality of the paper. First author is highly thankful to USPCAS-W, MUET, Jamshoro, Pakistan, for providing the valued environment to proceed for this PhD research paper.
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