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All Journal IJOG : Indonesian Journal on Geoscience Journal of Degraded and Mining Lands Management Phi : Jurnal Pendidikan Fisika dan Terapan Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal)
Ruchimat, Acep
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Education Engineering Physics Other

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Geophysical methods reveal a subsurface historic wastewater tunnel exposed by a sinkhole: a case study in Bandung City, Indonesia Parnadi, Wahyudi Widyatmoko; Warsa, Warsa; Nailufar, Mira; Jubaedah, Neng Endah; Ruchimat, Acep
Journal of Degraded and Mining Lands Management Vol. 12 No. 2 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2025.122.7265

Abstract

Bandung City, the capital of West Java Province in Indonesia, has changed its physical face rapidly due to the many constructions of office buildings, hotels, and other facilities until now. To avoid the instability of existing buildings and for building construction in the future, knowledge of the subsurface conditions in the city must be enhanced. A sudden soil collapse in the yard of the PAG Building occurred in early 2018 and resulted in a sinkhole with a diameter of 5 m, which revealed a historic wastewater tunnel structure in the subsurface. Non-invasive, low-cost, and time-effective geophysical methods to solve those problems are proposed. Ground-penetrating radar (GPR) and Electrical Resistivity Tomography (ERT), widely applied to identify artificial objects underground, came to be used for these purposes. A research to know the suitability of both methods for application began with numerical simulation, followed by field measurement on 4 GPR and ERT lines and analysis of each method. The results show that GPR data, through both numerical and field data,  could identify and locate the tunnel in a radargram due to its hyperbola shape, whereas ERT data provided the property contrast between the tunnel and its host. The results suggest that GPR and ERT techniques are effective for revealing water tunnels in the study area with a maximum depth of 1.8 m and a 65% reduction in size. These findings can be used as a guide to using both methods to reveal the water tunnel network in the central part of Bandung City for sustainable urban planning.
Penerapan Metode Multichannel Analysis of Surface Waves (MASW) untuk Interpretasi Bawah Permukaan sebagai Kontribusi Pembangunan Infrastruktur di Ibu Kota Nusantara (IKN) Handoyo, Handoyo; Alfatih, Zhilan Zhalilla Puti; Ruchimat, Acep; Wiyono, Wiyono; Akin, Özgenç; Andika, Putu Pradnya
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 3 (2025): Agustus
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i3.1187

Abstract

Ibu Kota Nusantara (IKN), yang akan ditetapkan sebagai pusat pemerintahan baru Indonesia di Kalimantan Timur, saat ini berada dalam tahap awal pengembangan infrastruktur yang mencakup kebutuhan mendasar seperti transportasi, utilitas publik, dan fasilitas penunjang lainnya. Kawasan Ibu Kota Nusantara (IKN) menuntut kajian geoteknik yang komprehensif untuk menjamin daya dukung tanah dan stabilitas struktur jalan tol. Untuk mendukung perencanaan dan pelaksanaan konstruksi secara aman dan efisien, pemahaman mengenai karakteristik geoteknik lapisan bawah permukaan menjadi sangat penting. Metode Multichannel Analysis of Surface Waves (MASW) merupakan salah satu pendekatan geofisika non-destruktif yang efektif dalam mengidentifikasi distribusi kecepatan gelombang geser (Vs). Prosedur MASW mencakup akuisisi data seismik, transformasi Fourier, pembentukan kurva dispersi frekuensi-kecepatan, serta inversi untuk menghasilkan distribusi Vs secara vertikal dan lateral. Berdasarkan distribusi nilai Vs, hasil analisis menunjukkan bahwa kecepatan gelombang geser di lokasi penelitian terdiri dari 4 lapisan utama, yaitu clay atau tanah lempung lunak (140-150 m/s), silty clay (150-200 m/s), medium to dense sands (200-400 m/s) dan gravels (>400 m/s). Analisis Vs yang dihasilkan memberikan informasi kritis untuk menentukan fondasi dapat dibangun sekiranya pada kedalaman >10 m. Dengan demikian, penerapan MASW diproyeksikan mampu menjembatani kesenjangan data geoteknik dan mendukung perencanaan konstruksi jalan tol di IKN secara lebih efektif dan efisien.
Geotechnical Parameters Determination by Using Seismic Refraction Tomography in The New Capital City of Indonesia, Nusantara: Implication to Analysis of Soil Compaction Handoyo, Handoyo; Amalia, Atika; Sigalingging, Asido Saputra; Ruchimat, Acep; Wiyono, Wiyono; Akin, Özgenç
Indonesian Journal on Geoscience Vol. 12 No. 3 (2025)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.12.3.423-435

Abstract

The new capital city of Indonesia, Nusantara, in East Kalimantan, is undergoing enormous infrastructural development in Indonesia. Understanding the condition of the soil, sediment, and hardrock layers at this location is critical for geotechnical working principles. In this study, the first arrival P-wave tomography method was used to determine the distribution of P-wave velocity and geotechnical parameters (e.g. porosity, density, void ratio) to better understand the condition of the rock layers at this location. This study involved the use of seismic refraction tomography data consisting of forty-eight channels with a distance between geophones of 1 m, and a source in the form of a sledgehammer weighing 3 kg with a separation distance of 3 m. The natural frequency of the geophones used was 4.5 Hz with a recording time of 1.0 sec. Results of this investigation reveal a thinning hardrock layer from the south to the north, with a thickness ranging from 7 to 16 m correlated to consolidated alluvium. Moreover, the geotechnical parameter of sediment layers, top soil (clayey soil) and unconsolidated alluvium, has a density value range from 1.6 to 1.8 g/cm³, porosity 0.31 to 0.38, and void ratio 0.44 to 0.59. These findings show that the soil layer in the south to the middle of line profile of the studied area has low to medium compaction, requiring soil hardening activities (mechanical compaction) for infrastructure construction. Finally, the findings of this study are expected to help with infrastructure development in the IKN by utilizing geophysical technique.
Electrical Resistivity Imaging on Limestone Formation for Aquifers Identification in Poguwatu Village, Central Sumba Nareswari, Aulia; Paembonan, Andri Yadi; Ruchimat, Acep
Jurnal Phi: Kurnal Pendidikan Fisika & Terapan Vol 12 No 2 (2026)
Publisher : Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/p-jpft.v12i2.35101

Abstract

Poguwatu Village in Central Sumba Regency is a dry area characterized by low rainfall and dominated by carbonate rocks, resulting in limited surface water availability and posing a persistent challenge for groundwater exploration. This study presents the first subsurface investigation using the Dipole-dipole resistivity geoelectrical method to characterize aquifer-bearing rock conducted in Poguwatu Village, West Cendana. This method has the ability to identify the conductor zone related to the saturation area where the water accumulated. Measurements were conducted along 5 survey lines, where each line has 620 m length, except Line 5 extending to 880 m, with 10 m electrode spacing. The measured data calculate in apparent resistivity value and then invert to true resistivity using least-square inversion processes. The result yielded RMS errors ranging from 17.7% to 24.8%. The inversion results identified four rock units based on resistivity values, sandy limestone saturated with saline water (< 2.0 Ωm), marl (2.0–32.0 Ωm), fractured or sandy limestone (32.0–128.0 Ωm), and compact limestone (>128.0 Ωm). A seepage with thickness ± 2 m was identified on Line 2 within the fractured/sandy limestone, bounded below by an impermeable marl. Compact limestone, with very low porosity and permeability, dominates in most of the study area and functions as an aquifuge, a finding corroborated by a dry borehole on Line 5 that failed to yield groundwater. These results indicate limited groundwater potential across Poguwatu Village, and further investigation into alternative water sources from surrounding areas is recommended for the community's water supply.
Co-Authors Akin, Özgenç Akin, Özgenç Alfatih, Zhilan Zhalilla Puti Amalia, Atika Andika, Putu Pradnya Andri Yadi Paembonan Handoyo Handoyo Jubaedah, Neng Endah Nailufar, Mira Nareswari, Aulia Parnadi, Wahyudi Widyatmoko Sigalingging, Asido Saputra Warsa Warsa Wiyono wiyono