Separation of Fresh and Saline Water Using by Interpretation of Geoelectric Data (A Case Study of Eshtehard in North of Iran)

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Groundwater study through the operation of geoelectric, considered one of the best known way in the field. Consideration and accuracy in accurate extraction of water and using the proper equipment and interpret detailed data can reveal high potential of these methods in the best way for underground exploration. This study was conducted to investigate the separation of fresh and saline water, using the analysis and interpretation of geoelectric data collected by the array Schlumberger. Because human needs for fresh water for drinking water, agriculture, animal husbandry and industry, and difficulties in the initial identification layer of saline water in these important activities, find a way to solve these problem is very important. The purpose of case study conducted in southwestern of plains Eshtehard is recognition of border of saltwater and freshwater for wells to provide water for the construction of water wells to water supply for greenhouses exist in the region. In this study, by obtaining data geoelectric and their interpretation, was observed that by increasing the amount of EC (electrical conductivity) due to presence of the solute salts in certain depth of groundwater, sudden drop in specific resistivity be seen in specific range of Probing taken, and according to studies carried out in different regions of the world, these sudden change is known as the boundary separating fresh and saline water, that study and comparison of geophysical data with log obtained from drilled wells in these area, also is a confirmation of these fact.

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