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Journal : Journal of Geoscience, Engineering, Environment, and Technology

Geology and Identification of Freshwater Sources Using Water Resistivity Survey in Landu Village, Rote Ndao, East Nusa Tenggara, Indonesia Gunawan, Indra; Rudyawan, Alfend; Pamumpuni, Astyka; Handayani, Alfita Puspa; Hadiana, Meli; Sapiie, Benyamin; Febrianti, Adinda
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 02 (2025): JGEET Vol 10 No 02 : June (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.02.21729

Abstract

Located within the tectonically complex Banda Arc of eastern Indonesia, Landu Island, in Rote Ndao, East Nusa Tenggara provides a unique setting to investigate the relationship between arc-continent collision, karst development, and groundwater dynamics. The island is primarily underlain by Quaternary limestones, which form the principal aquifer system. Despite this hydrogeological potential, Landu faces acute freshwater shortages, particularly during the dry season. This study combines geological field mapping with a 1D electrical resistivity survey to characterize subsurface lithology, identify groundwater-bearing units, and assess the extent of seawater intrusion. The geological survey reveals slightly southward-tilted, fossiliferous limestones that exhibit clear evidence of karstification, indicating a history of tectonic uplift and surface water infiltration. A freshwater spring—currently the main source of potable water for the local population—was documented in the southeastern part of the island, with a total dissolved solids (TDS) concentration of 924 ppm, suggesting moderate water quality. Resistivity modeling identifies two potential aquifers: a shallow zone at depths of 5.2–17.2 m, and a more extensive, deeper reservoir between 35.1–92.1 m. The shallow aquifer shows lower resistivity values, indicative of possible saltwater mixing, which correlates with historical reports of failed boreholes in this zone. In contrast, the deeper aquifer exhibits higher resistivity signatures, suggesting better preservation of freshwater and greater potential for sustainable extraction. These findings highlight the critical influence of structural controls and karst processes on groundwater storage and quality. The study emphasizes the need for careful aquifer targeting and protection measures to prevent saltwater intrusion. Future work should focus on high-resolution geophysical imaging and long-term monitoring to support resilient water resource management on Landu Island.
Co-Authors Abdul Aziz Abdurrahman, Dadi Achmad Fathoni, Achmad Achsani , Muhammad Achva, RA. Jihan Ulima Ade Kusmana Adhika Pramita Widyassari Adrian Hidayat, Adrian Advocaat, Eldert Afrina Agusinta, Lira Agustiani, Nurwulan Agustina, Sumarti agustini, lila Ahadi, Eko Ahmad Junaidi Ahmad Saefudin Akbar, Azriel Albertus Husein Wawo Aldrin T, Edwin Alfita Puspa Handayani Alyaza, Vioni Nabila AMANDA, REGINA Ambariyanto Ambariyanto Amin Rejo Andy Andy Anggia Suci Pratiwi Anggraeni, Rr Dian Anggraini, Rosi Apandi, Khairul Aprillitzavivayarti, Aprillitzavivayarti Arbi Dimyati Ardhicaraka, Irvan Zaelana Ardini, Dias Arief, M. Fadillah Arinal Haq Izzawati Nurrahma Aris Sudianto Arya Kukuh Y Asep Setiawan Aslorida, Bella Oktania Asriatun, Sulastri Asti Tri Lestari, Asti Tri Astuti, Ella Dwi Astuti, Rini Juni Ayu Vinlandari Wahyudi Ayunda, Yuli Septya Ayuni, Riski Baiq Andriska Candra Permana Bakti, Andi Prasetyo Bambang Sugeng Benyamin Sapiie Carolina Evelyn Cottam, Mike A. 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