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All Journal Journal of Degraded and Mining Lands Management Prosiding Temu Profesi Tahunan PERHAPI
Parnadi, Wahyudi Widyatmoko
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering

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Vertical electrical sounding method and Dar Zarrouk analysis to identify the distribution of seawater intrusion in Pelauw Village, Maluku Bahri, Samsul; Tualepe, Daramahu; Batlolona, Yohanis Toni; Ramadhan, Aditya; Parnadi, Wahyudi Widyatmoko
Journal of Degraded and Mining Lands Management Vol. 11 No. 4 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.114.6089

Abstract

Groundwater is one of the essential resources that support human life. Excessive exploitation activities can cause groundwater problems such as seawater intrusion, especially in coastal areas. Groundwater salination must be a concern and measured to determine the condition and level of distribution. One of the non-invasive, inexpensive, and efficient methods to see seawater intrusion phenomena is the vertical electrical sounding (VES) technique of electrical resistivity method. This research aimed to analyze the distribution of seawater intrusion in Pelauw Village, Maluku, Indonesia, using the VES and Dar-Zarrouk parameters S and T. The S and T are longitudinal conductance and transversal resistance, respectively. This study collected 16 VES stations spread across residential areas near the coast of Pelauw Village. Groundwater affected by seawater intrusion in the study area has S>1.00 mho and T<1,000 ohm m2. Three VES stations are suspected to have experienced seawater intrusion, namely V7, V8 and V12. These three stations are located near the shoreline and densely populated areas. Based on the 2D cross-section, the spread of seawater intrusion toward the land is about 200 meters. This seawater intrusion event is thought to have occurred due to groundwater exploitation by communities around the coast and active tectonic activity. The VES method and Dar Zarrouk Analysis proved compelling enough to delineate the spread of seawater intrusion, so based on these results, it can be a reference for mitigating groundwater pollution.
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.
EVALUASI SUMBER DAYA PASIR KUARSA BERDASARKAN DATA PEMBORAN DAN SURVEI GPR PADA MATERIAL SISA HASIL PENGOLAHAN TIMAH ALUVIAL DI KEPULAUAN BANGKA DAN BELITUNG Safitra, Roby Mardiyan; Heriawan, Mohamad Nur; Anggayana, Komang; Parnadi, Wahyudi Widyatmoko; Azwardi, Ichwan; Rubiarto, Rubiarto
Prosiding Temu Profesi Tahunan PERHAPI 2023: PROSIDING TEMU PROFESI TAHUNAN PERHAPI
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pasir kuarsa merupakan salah satu bahan galian yang dimanfaatkan untuk memenuhi kebutuhan industri manufaktur. Pasir kuarsa yang diperoleh dari area penambangan timah aluvial memiliki kandungan silika (SiO2) yang cukup tinggi dengan rata-rata kadar 95%. Sehingga dalam alur pengolahan bijih timah, hasil penambangan dan pengolahan yang berlangsung telah menghasilkan pasir kuarsa berkualitas cukup tinggi sebagai produk sisa hasil pengolahan (SHP). Studi ini dilakukan untuk mengevaluasi potensi atau sumber daya material SHP yang berupa silika yang terdapat di lima lokasi di Kepulauan Bangka dan Belitung. Metode yang dilakukan untuk mengevaluasi sumber daya pasirkuarsa adalah survei geofisika dengan metode ground penetrating radar (GPR) tipe unshielded dan shielded untuk menginterpretasikan variasi ketebalan lapisan di setiap lokasi. Panjang lintasan pengambilan data GPR cukup beragam berkisar pada rentang 100 – 900 m tergantung pada luasan dan kondisi sebagian besar lokasi studi yang berupa kolong bekas tambang dan hutan sawit. Metode pemboran dengan spasi yang bervariasi mulai dari 50 m, 100 m, 150 m, sampai 200 m dilakukan untuk pengambilan sampel SHP dan meningkatkan keyakinan terhadap model geometri lapisan pasir kuarsa.Berdasarkan data hasil pemboran pada lima lokasi (blok) yang berada di Kepulauan Bangka dan Belitung diperoleh informasi berupa volume pasir kuarsa dan kandungan silika yang cukup signifikan dan dapat mendukung peluang bisnis terhadap komoditas tersebut. Kombinasi antara data pemborandan data GPR akan menghasilkan model geometri yang lebih akurat daripada berdasarkan data pemboran saja. Spasi pemboran yang semakin lebar menunjukkan perbedaan volume pasir kuarsa yang lebih besar antara interpretasi berdasarkan data pemboran saja dibandingkan dengan kombinasi data pemboran dan GPR. Sehingga penggunaan survei GPR untuk spasi pemboran yang lebih lebar terutamapada spasi 100 – 200 m dapat meningkatkan keyakinan terhadap hasil estimasi sumber daya pasir kuarsa
Co-Authors Azwardi, Ichwan Batlolona, Yohanis Toni Heriawan, Mohamad Nur Jubaedah, Neng Endah Komang Anggayana Nailufar, Mira Ramadhan, Aditya Rubiarto, Rubiarto Ruchimat, Acep Safitra, Roby Mardiyan Tualepe, Daramahu Veithzal Rivai Zainal Warsa Warsa