Bulletin of the Geological Society of Malaysia, Volume 75, May 2023, pp. 3 – 12
Nur Islami*, Mitri Irianti, Azhar Azhar, Muhammad Nasir, Muhammad Nor, Fakhruddin Fakhruddin, Dedi Irawan
Physics – PMIPA, Universitas Riau, Jl. HR. Soebrantas, Km. 12.5, Pekanbaru, 28293, Indonesia
* Corresponding author email address: nurislami@lecturer.unri.ac.id
Abstract: An improvement of geoelectrical resistivity interpretation has been done through this research. Up to now, the geoelectrical resistivity data was interpreted qualitatively especially in the case of the aquifer intruded by seawater, and the percentage of seawater mixture content in the aquifer cannot be predicted. In this research, a valuable approach was used in the prediction of percentage seawater mixture in the shallow aquifer that is intruded by seawater. The study was conducted in the coastal area which is mainly covered by peat soil. The research employed the direct soil resistivity measurement and the ground surface resistivity survey. Geoelectrical resistivity with the Wenner configuration was used for both measurements. The soil character and the fluid content in the soil were measured to obtain their correlation to the direct soil resistivity value. The results show that resistivity value is about 2-5 ohm.m for 50% seawater content mixture in aquifer and it increase to be 5-10 ohm.m for 25% seawater mix to freshwater in the aquifer. The increasing seawater content in the pore soil caused the decreases in resistivity value drastically. The percentage of seawater mixture in the fluid pore soil has been successfully predicted through the geoelectrical resistivity measurement on the surface.
Keywords: Seawater intrusion, geoelectrical resistivity, Dumai, groundwater
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Manuscript received 9 June 2022;
Received in revised form 23 February 2023;
Accepted 7 March 2023
Available online 26 May 2023
DOI: https://doi.org/10.7186/bgsm75202302
0126-6187; 2637-109X / Published by the Geological Society of Malaysia.
© 2023 by the Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution (CC-BY) License 4.0.
