Estimation of Subsurface River Flow Using the Very Low-Frequency (VLF) and 2D Resistivity Methods of the Guwoterus Karst Area, Tuban

Zahrotuts Tsaniyah*, Khusnul Nur Rochmah, Thoharinnisa Pambayun, Muhammad Hauzan Nabhan, Azriel Aziz Fiilliyatinnuriz Alhasan, M. Singgih Purwanto, Anik Hilyah, Nita Ariyanti

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

Karst is a landscape that has the characteristics of steep hills, dolina, many caves, and subsurface rivers. One of the problems in the karst area is determining the existence of an underground river which is a source of clean water for the community. Therefore, this research aims to estimate the underground rivers at Guwoterus Karst area, Tuban. This study used a Very Low-Frequency Electromagnetic (VLF-EM) method with 6 tracks and each track length of 200 meters, and 2D resistivity using Wenner configuration of 4 tracks with the length of 150 meters. In this research, 3 filtering was performed on data processing using the VLF-EM method, including the NA-MEMD, Fraser, and Karous-Hjelt filters. Identification of subsurface river flows has been done by correlating the VLF-EM and 2D resistivity methods through the inversion of the field observation data. The processing data shows that the depth of the subsurface river ranges from 1-21 meters with resistivity values from 20-100 ohm. The flow of the river leads from North-South following the topography of the research area and consists of limestone with intensive cracks. Based on the results of 2D resistivity processing, lithology assumptions were obtained at the research area. A resistivity of <100 ohm is assumed to be topsoil, while a resistivity of <300 ohm is assumed as a cave full of water. Then the resistivity value between 300 ohm to 700 ohm is assumed to be limestone, and the resistivity value >700 ohm is assumed to be hollow limestone.

Original languageEnglish
Article number080002
JournalAIP Conference Proceedings
Volume3076
Issue number1
DOIs
Publication statusPublished - 5 Jun 2024
Event1st International Conference on Upstream Energy Technology and Digitalization, ICUPERTAIN 2022 - Jakarta, Indonesia
Duration: 6 Dec 20227 Dec 2022

Fingerprint

Dive into the research topics of 'Estimation of Subsurface River Flow Using the Very Low-Frequency (VLF) and 2D Resistivity Methods of the Guwoterus Karst Area, Tuban'. Together they form a unique fingerprint.

Cite this