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All Journal Journal of Degraded and Mining Lands Management Jurnal Geofisika Journal of Engineering and Technological Sciences Jurnal Geosaintek Tanah Goyang: Jurnal Geosains Tanah Goyang : Journal of Geoscience
Warsa Warsa
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Physics

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Identifikasi Mineral Logam Daerah X Kabupaten Solok Selatan Berdasarkan Data Geolistrik Resistivitas dan Polarisasi Terimbas Siahay, Michael Marthin; Warsa, Warsa; Limehuwey, Resti; Bahri, Samsul
Tanah Goyang : Jurnal Geosains Vol 2 No 1 (2024): Tanah Goyang : Jurnal Geosains
Publisher : Program Studi Teknik Geofisika, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/tanahgoyang.2.1.1-12

Abstract

Indonesia adalah negara yang memiliki potensi sumber daya mineral yang melimpah. Hal ini diakibatkan oleh pertemuan antara tiga lempeng tektonik utama, yaitu Lempeng Indo Australia, Lempeng Pasifik, dan Lempeng Eurasia. Lokasi penelitian terletak pada daerah “X”, Kabupaten Solok Selatan, Provinsi Sumatera Barat. Diperkirakan bahwa Daerah “X” merupakan salah satu daerah yang memiliki potensial sebaran endapan mineral logam sulfida seperti tembaga, emas, dan perak. Untuk mengetahui lebih lanjut mengenai potensi mineralisasi pada daerah penelitian dilakukan dengan memanfaatkan salah satu metode geofisika yakni metode polarisasi terimbas. Konfigurasi elektroda yang digunakan ialah dipol-dipol. Lintasan pengukuran terdiri atas sebelas lintasan, dari lintasan F hingga lintasan P. Lintasan F menggunakan spasi elektroda sebesar 25 m, sedangkan Lintasan G hingga lintasan P menggunakan spasi elektroda sebesar 50 m. Pengolahan data polarisasi terimbas menghasilkan model 2D tahanan jenis dengan rentang nilai 0 sampai 1500 Ωm dan chargeabilitas dengan rentang nilai 0 sampai 20 mV/V. Zona mineralisasi diduga berada pada setiap lintasan dengan nilai chargeabilitas tinggi (lebih dari 10 mV/V) yang berasosiasi dengan nilai tahanan jenis rendah (kurang dari 100 Ωm) hingga tinggi (lebih dari 1000 Ωm). Pengeboran awal dapat dilakukan pada titik M-1550 hingga M-1800, dimana hal tersebut didasarkan pada hasil nilai chargeabilitas tinggi (lebih dari 10 mV/V). Berdasarkan hasil pengolahan data diperkirakan volume zona mineralisasi pada daerah penelitian sebesar 0.0248 km3.
Pemodelan Inversi Data Vertical Electrical Sounding (VES) Menggunakan Hybrid Differensial Evolution Flower Pollination Algorithm (HDEFPA) Pattiasina, Liora Chrissa; Warsa, Warsa; Bahri, Samsul
Tanah Goyang : Jurnal Geosains Vol 2 No 2 (2024): Tanah Goyang : Jurnal Geosains
Publisher : Program Studi Teknik Geofisika, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/tanahgoyang.2.2.108-121

Abstract

Geoelectric Resistivity is a geophysical method for mapping subsurface resistivity. Vertical Electrical Sounding (VES) is often used because of its ease in providing information on vertical lithological distribution. Modeling inversion of VES data is a complex challenge due to the non-linear relationship between data and model parameters. This research uses the Hybrid Differential Evolution Flower Pollination Algorithm (HDEFPA) as a global optimization method to overcome this problem. HDEFPA combines Flower Pollination (FPA) and Differential Evolution (DE) algorithms, which have both global and local search capabilities. Tests were carried out with synthetic VES data on two-layer, three-layer (K-type and H-type), and four-layer earth models. In addition, field data from seawater intrusion in Pelauw, Maluku, Indonesia were used. The results show that HDEFPA is superior to FPA and single DE in fast convergence and fewer iterations. The HDEFPA algorithm successfully validates field data, producing reliable and accurate results. This research provides insight into the advantages of global optimization methods over local inversion methods in inversion modeling of VES data.
Assessment of Groundwater Contamination around Bakung Landfill, Lampung, Indonesia Using Geoelectrical Resistivity and Hydrogeochemical Data Rizka, Rizka; Santoso, Djoko; Warsa, Warsa; Iskandar, Irwan
Journal of Engineering and Technological Sciences Vol. 58 No. 2 (2026): Vol. 58 No. 2 (2026): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.2.1

Abstract

This study investigates groundwater contamination caused by leachate migration at the Bakung landfill during the wet and dry seasons using geoelectrical resistivity and hydrogeochemical methods. The objective is to describe groundwater contamination resulting from leachate and assess groundwater quality from nearby wells along the edge of the Bakung landfill. 1D resistivity sounding (vertical electrical sounding (VES)) survey was conducted at eight sounding points using the Schlumberger configuration, and four lines of 2D resistivity imaging (electrical resistivity tomography (ERT)) were acquired inside and outside the landfill site using the Wenner configuration. The 1D resistivity inversion model show that subsurface resistivity values lower than 40 Ωm are likely associated with tuff rocks, whereas resistivity values greater than 40 Ωm are associated with volcanic breccia. The 2D resistivity imaging model indicates a leachate plume. Migrating into the lower layers of the landfill occurs from the northeast and northwest, suggesting potential contamination of shallow groundwater systems as the landfill ages. The hydrogeochemical assessment of groundwater samples followed APHA standards, identifying hydrogeochemical facies using the Piper diagram and interpreting hydrogeochemical processes using the Gibbs and Gaillardet diagrams. The Piper diagram shows the presence of mixed Ca-Mg-Cl, Ca-HCO3, and Na-Cl facies, with the Na-Cl type found only in well W1, which contains leachate. Contaminated areas exhibit slight increases in ionic concentrations. To prevent contamination from migrating into the aquifer, contaminated zones must be identified.
Co-Authors Djoko Santoso Donny Prasetyo Hendra Grandis Irwan Irwan Jubaedah, Neng Endah Manuhutu, Axl Amahena Muhammad Hasbi Assiddiqy Nailufar, Mira Parnadi, Wahyudi Widyatmoko Pattiasina, Liora Chrissa Pinehas, D Resti Limehuwey, Resti Rizka Rizka, Rizka Ruchimat, Acep Samsul Bahri Siahay, Michael Marthin Wahyudi W. Parnadi Waruwu, Petrus Yolanda, Swenly