Determination of borehole locations and saline-water intrusion for groundwater in Central Anatolia Region, Turkey using electrical tomography (ERT) method

Autor: Nuray Alpaslan
Rok vydání: 2021
Předmět:
Zdroj: Environmental Earth Sciences. 80
ISSN: 1866-6299
1866-6280
DOI: 10.1007/s12665-021-10117-7
Popis: In groundwater studies, resistivity as a geophysical technique is actively employed as a guide in determining borehole locations. With the advancements in electronic and computer technologies, multi-electrode measurement devices have been used recently in the resistivity method. These devices enable the capturing of two-dimensional (2D) and three-dimensional (3D) tomographic images of underground areas. With the use of multi-electrode devices, faster and more economical studies can be carried out in immense areas. Moreover, more data on underground areas can be produced. In this research, an electrical resistance tomography (ERT) study was performed to determine the characteristics of an aquifer potentially containing groundwater in the Sarioglan district of the province of Kayseri, in the Palas location. Another major goal was to determine the appropriate borehole locations where water will be collected. Electrical resistivity measurements were made with an AGI R8 SuperSting device using the dipole–dipole gradient method along a line of approximately 11 km in the specified area. 2D ERT images of the study area were created using EarthImager 2D software. The first aquifer determined is a limestone unit with an average thickness of 130 m and resistivity values between 300 and 1370 Ωm, and the second aquifer has an average thickness of 450 m and resistivity values between 360 and 2510 Ωm. Based on the obtained geophysical measurements and geological interpretations of the electrical ground sections, it was concluded that boreholes can be drilled at 200 and 450 m at locations determined in this aquifer unit, which indicated the potential presence of groundwater in the region. Also, as a result of this study, it was observed that the reduction of groundwater in Tuzla Lake and its surroundings, located in the Palas Plain, affects the ecological balance negatively and the salinization of groundwater may pose a significant risk for the region.
Databáze: OpenAIRE
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