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All Journal POSITRON Wahana Fisika : Jurnal Fisika dan Terapannya Journal of Engineering and Technological Sciences Phi : Jurnal Pendidikan Fisika dan Terapan Jurnal Spektra Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Jurnal Penelitian Pendidikan IPA (JPPIPA) BULLETIN OF THE MARINE GEOLOGY Spektra: Jurnal Fisika dan Aplikasinya JURNAL TEKNIK PATRA AKADEMIKA PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL)
Eleonora Agustine
Departemen Geofisika Fakultas MIPA Universitas Padjadjaran, Jalan Raya Bandung Sumedang Km 21, Hegarmanah, Jatinangor, Sumedang, Jawa Barat 45361, Indonesia.
Aerospace Engineering Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Physics Other

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SIFAT MAGNETIK SEDIMEN SUNGAI SEBAGAI INDIKATOR PENCEMARAN (STUDI KASUS : SUNGAI CITARUM KABUPATEN KARAWANG) H. Kirana, Kartika; Fitriani, Dini; Supriyana, Eddy; Agustine, Eleonora
Jurnal Spektra Vol 15, No 2 (2014): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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

Abstract

Sungai Citarumsangatpentingbagikehidupansocialekonomimasyarakat yang tinggal di sekitar Daerah Aliran Sungai (DAS). Selain digunakan sebagai sumber air minumoleh Perusahaan Daerah Air Minum (PDAM), irigasi pertanian dan perikanan, pembangkit listrik tenaga air, DAS Citaum juga dijadikan sebagai daerah buangan limbah pabrik dan rumah tangga. yang berpotensi sebagai sumber pencemar. Menyadari bahwa keberadaan Sungai Citarum ini sangat penting, maka diperlukan monitoring dan evaluasi terhadap pencemaran air Sungai Citarum. Metode kemagnetan batuan sebagai suatu metode yang cepat dan mudah, dapat digunakan sebagai proxy indicator pencemaran air Sungai Citarum melalui pengukuran suseptitibilitas magnetik. Penggunaan metoda ini didasarkan pada kelimpahan mineral magnetik yang terkandung dalam setiap bahan di alam. Bahan yang akan digunakan sebagai sampel untuk menduga pencemaran air adalah sedimen DAS Citarum. Nilai suseptibilitas magnetik diukur dengan menggunakan alat Bartington MS2B yang beroperasi pada dua frekuensi, 470 Hz dan 4700 Hz. Hasil pengukuran menunjukkan urutan daerah yang memiliki suseptibilitas magnetik yang diukur pada 470 Hz(XLF), dari yang terbesar hingga terkecil adalah Walahar, Waduk Jatiluhur, Curug Klari, Tunggakjati, Medangasem-Jayakerta, dan PDAM. Pengukuran suseptibilitas magnetik dilakukan pula pada frekuensi yang lebih tinggi (XHF), yaitu 4700 Hz. Perbedaan relatif nilai suseptibilitas magnetik yang diukur pada dua frekuensi disebut sebagai suseptibilitas bergantung frekuensi (XFD).Pengukuran suseptibilitas magnetik pada dua frekuensi tersebut menunjukkan bahwa sampel pada daerah kajian memiliki nilai XFD (%) kurang dari 4 %.Nilai suseptibilitas bergantung frekuensi yang rendah (1-4%) sering ditemukan pada tanah yang terkontaminasi.Berdasarkan hal tersebut, dapat diduga bahwa mineral magnetik di daerah kajian berasal dari sumber antropogenik.Dugaan bahwa sumber mineral magnetik merupakan sumber antropogenik didukung oleh analisa statistik yang menunjukkan korelasi negatif antara XLF dan XFD. Adanya korelasi negatif antara XLF dan XFD mengindikasikan bahwa mineral magnetik berasal dari polusi industri. Kata kunci: suseptibilitasmagnetik, pencemaran, Sungai Citarum
IDENTIFIKASI KUALITAS AIR SUNGAI CITARUM HULU MELALUI ANALISA PARAMETER HIDROLOGI DAN KANDUNGAN LOGAM BERAT (STUDI KASUS: SUNGAI CITARUM SEKTOR 7) Kirana, Kartika Hajar; Novala, Gesti Cita; Fitriani, Dini; Agustine, Eleonora; Rahmaputri, Maghfira Dwivani; Fathurrohman, Fahmy; Rizkita, Nabila Risty; Andrianto, Nico; Juniarti, Nita; Zaenudinna, Rayna Aulia; Nawawi, Muhamad Rovie; Mentari, Vanessa Zian; Nugraha, Muhamad Gina; Mulyadi, Yudi
Wahana Fisika Vol 4, No 2 (2019): December
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/wafi.v4i2.21907

Abstract

Sungai Citarum merupakan salah satu sungai yang menunjang kehidupan sebagian besar masyarakat Jawa Barat. Akan tetapi, dampak kegiatan manusia telah membuat Sungai Citarum sebagai sungai yang tercemar. Penelitian ini dilakukan untuk mengetahui kondisi wilayah hulu Sungai Citarum dengan melakukan pengukuran multi parameter terhadap kondisi air di Sungai Citarum Hulu dan air sumur warga sekitar, terutama Sektor 7. Wilayah penelitian ini secara administratif berada di Desa Pangauban, Kecamatan Katapang, Kabupaten Bandung. Sampel yang diuji pada penelitian ini adalah sampel air sungai dan sampel air sumur milik warga yang tinggal di sekitar Sungai Citarum sebanyak masing-masing enam titik lokasi pengamatan. Hasil pengukuran parameter hidrologi dan kandungan logam berat pada sampel air sungai dan air sumur menunjukan bahwa nilai pH, suhu, dan TDS masih di bawah ambang batas tercemar, sedangkan nilai EC menunjukkan bahwa air sumur dan air sungai telah tercemar. Hal ini dibuktikan dengan analisa kandungan logam berat yang dapat dilihat bahwa terdapat kandungan logam besi (Fe) yang cukup tinggi di atas ambang batas air bersih sehingga air tersebut tidak dapat di konsumsi bagi warga, baik untuk air sungai maupun air sumur. Citarum River is one of the rivers that supports the lives of most of the people of West Java. However, the impact of human activities has made the Citarum River a polluted river in the world. This research was conducted to determine the condition of the upstream area of the Citarum River by conducting multi-parameter measurements to water conditions in the Upstream Citarum River Sector 7 and the wells of the surrounding residents. This research area is administratively located in Pangauban Village, Ketapang District, Bandung Regency.  The samples tested in this study were river water samples at six observation locations and well water samples belonging to the residents living around the Citarum River as many as six observation location points. The results of measurements of hydrological parameters and heavy metal content in river and well water samples indicate that the pH, temperature, and TDS values are still below the polluted threshold, while the EC values indicate that well water and river water have been polluted. This is evidenced by the analysis of heavy metal content which can be seen that there is a high metal content of iron (Fe) above the threshold of clean water so that the water cannot be consumed by residents, both for river water and well water.Kata kunci : hidrologi, logam berat, Sungai Citarum
Three-dimensional DC Resistivity Modeling using Galerkin Finite Element Method Composed by Tetrahedral Elements Srigutomo, Wahyu; Anwar, Hairil; Agustine, Eleonora; Mahardika, Harry
Journal of Engineering and Technological Sciences Vol 51, No 4 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (768.912 KB) | DOI: 10.5614/j.eng.technol.sci.2019.51.4.5

Abstract

Successful interpretation of DC resistivity data depends on the availability of a proper forward modeling scheme. In this study, a three-dimensional DC resistivity forward modeling scheme was developed using the finite element method. The finite element equations were obtained using a weakened form of the weighted-residual method called the Galerkin method. Discretization of the modeling domain was carried out by dividing it into smaller three-dimensional blocks and subdividing each block into five tetrahedral elements. A linear interpolation function was employed and elemental linear equations were set up, followed by formation of global matrix systems of equation and incorporation of proper boundary conditions. The conjugate gradient method was applied to solve the global system of equations, which in this study was proven to be more efficient than a direct solver, contributing to a 67% time reduction. Using a Wenner array configuration, comparison with theoretical calculation of the electric potential for a homogeneous model yielded a relative error of 3.66%. To confirm the applicability of this forward modeling scheme, apparent resistivity profiles for several basic three-dimensional subsurface resistivity models were compared with the analytical profiles, yielding an acceptable level of fitting.
IDENTIFIKASI SIFAT MAGNETIK TANAH DI DAERAH TANAH LONGSOR Rahma Andini Pratiwi; Agum Gumelar Prakoso; Riski Darmasetiawan; Eleonora Agustine; Kartika Hajar Kirana; Dini Fitriani
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (508.836 KB) | DOI: 10.21009/0305020402

Abstract

A research has been conducted to identified magnetic properties of soil in landslides area. Soil samples had taken in two areas, area A located in landslides area and area B has not experienced landslides. We have identify magnetic parameter based on magnetic susceptibility measurements in 0,46 kHz and 4,6 kHz . The measurement results showed that the value of area A is 345.2 × 10-8 m3/kg to 571 × 10-8 m3/kg and the value of in area B is 332.3 × 10-8 m3/kg to 668.1 × 10-8 m3/kg. The range of magnetic susceptibility values show that the magnetic minerals contained in the samples are classified as ferrimagnetic minerals. Relative difference between and is known as frequency dependent susceptibility . Calculated value of in area A is about 2.65% to 3.33% and area B is 0.97% to 2.58%. The value of indicates that area A contained more much superparamagnetic grains than area B. Soils that contain much superparamagnetic grains will be finer and easy to absorb water. The addition of soil mass by water could cause the soil more susceptible to landslide if located in steep slope. Keywords: Landslides, magnetic susceptibility, superparamagnetic grain.
Three-dimensional DC Resistivity Modeling using Galerkin Finite Element Method Composed by Tetrahedral Elements Wahyu Srigutomo; Hairil Anwar; Eleonora Agustine; Harry Mahardika
Journal of Engineering and Technological Sciences Vol. 51 No. 4 (2019)
Publisher : Institute 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.2019.51.4.5

Abstract

Successful interpretation of DC resistivity data depends on the availability of a proper forward modeling scheme. In this study, a three-dimensional DC resistivity forward modeling scheme was developed using the finite element method. The finite element equations were obtained using a weakened form of the weighted-residual method called the Galerkin method. Discretization of the modeling domain was carried out by dividing it into smaller three-dimensional blocks and subdividing each block into five tetrahedral elements. A linear interpolation function was employed and elemental linear equations were set up, followed by formation of global matrix systems of equation and incorporation of proper boundary conditions. The conjugate gradient method was applied to solve the global system of equations, which in this study was proven to be more efficient than a direct solver, contributing to a 67% time reduction. Using a Wenner array configuration, comparison with theoretical calculation of the electric potential for a homogeneous model yielded a relative error of 3.66%. To confirm the applicability of this forward modeling scheme, apparent resistivity profiles for several basic three-dimensional subsurface resistivity models were compared with the analytical profiles, yielding an acceptable level of fitting.
Curie Point Depth Analysis of Lesugolo Area, East Nusa Tenggara, Indonesia Based on Ground Magnetic Data Alamta Singarimbun; Umar Said; Dini Andriani; R. B. Astro; Bakrun Bakrun; I G. P. F. Soerya Djaja; Eleonora Agustine; Pepen Supendi; Wahyu Srigutomo
Journal of Engineering and Technological Sciences Vol. 54 No. 1 (2022)
Publisher : Institute 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.2022.54.1.11

Abstract

The Curie point depth, or magnetic basal depth, of the Lesugolo geothermal area in Ende, Flores Island, East Nusa Tenggara, Indonesia was estimated by performing spectral analysis on spatial magnetic data and transforming it into the frequency domain, resulting in a link between the 2D spectrum of magnetic anomalies and the depths of the top and centroid of the magnetic sources. Shallow Curie point depths of 16 to 18 km were found in the north-northeast to southeast areas of Lesugolo, while deeper depths of 24 to 26 km were found in the southwest. The tectonic setting beneath the central part of Flores Island governs the distribution of the Curie point depths in the area. Shallow Curie point depth zones are associated with high thermal gradients (30 to 34 °C/km) and heat flow (80 to 100 mW/m2). Deep depths, on the other hand, correspond to zones of low thermal gradient (21 to 26 °C/km) and low heat flow (65 to 80 mW/m2). Both the derived thermal gradient and the heat flow maps contribute to a better understanding of the Lesugolo geothermal system’s configuration. This study suggests that the Lesugolo geothermal area’s prospect zone is located in the center of the investigated area, where the Lesugolo normal fault forms its southeastern boundary.
Struktur Resistivitas Dangkal Sebagai Upaya Mitigasi Bencana Pergerakan Tanah Bambang Wijatmoko; Budy Santoso; Eleonora Agustine; Yudi Rosandi
Jurnal Pengabdian kepada Masyarakat (Indonesian Journal of Community Engagement) Vol 5, No 1 (2019): April
Publisher : Direktorat Pengabdian kepada Masyarakat Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (497.247 KB) | DOI: 10.22146/jpkm.33076

Abstract

Cisempur village is located at the slope of Mount Geulis, having a very variated morphology from gentle slopes to very steep ones. Due to the high demand for settlements the land use change can not be avoided.  The steepness of the slope, the decrease of the number of vegetations, and the increase of load from buildings may induced land slide occurrence.  This problem motivate us to perform measurement at the area, in order to uncover the information about the level of stability and the land carrying capacity, through the study of the subsurface rock layering condition. In this work, we present the shallow resistivity by means of Electrical Resistivity Tomography (ERT) method in two measurement lines. The obtained data is processed using 2D inversion method, in order to obtain the layering structure cross-section. The interpretation of the results suggest the existence of sandstone, which is normally associated with the location of aquifer and tuffaceous clay. The tuffaceous may function as the slide plane in the land slide event. The interpretation also shows that the carrying capacity decrease very extremely at the settlement site, which is indicated by the land displacement. This information has to be socialized and transferred to the inhabitant, in order to build awareness, and the land slide disaster mitigation can be carried out.
ANALISIS SEDIMEN EKSTRASI UNTUK PENDUGAAN PENCEMARAN DAS CIKAYAMBANG DAN DAS CIAYANG MENGGUNAKAN METODA KEMAGNETAN BATUAN Trimadona Trimadona; Agustine Eleonora
Jurnal Teknik Patra Akademika Vol 8 No 02 (2017): Jurnal Teknik Patra Akademika
Publisher : Politeknik Akamigas Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (748.604 KB)

Abstract

Mineral magnetik merupakan salah satu indikator terjadinya pencemaran lingkungan yang direpresentasikan oleh prosentase kandungan mineral Fe. Semakin tinggi kandungan Fe semakin besar kemungkinan suatu daerah tercemar. Pada penelitian ini daerah kajian dipilih DAS Cikayambang dan DAS Ciayang Kabupaten Garut Jawa Barat. Tiap DAS diambil 5 sampel dan 1 sampel pada pertemuan DAS tersebut. Analisis dilakukan perkedalaman 5 cm pada setiap titik sampel. Sampel dianalisis menggunakan metoda suseptibilitimeter. Dari hasil analisis ini, DAS Cikayambang mempunyai: mineral magnetik kandungan Fe paling tinggi adalah mineral magnetite (Fe3O4) kandungan Fe 72% di titik A1, A2,A3, A4 sedangkan pada DAS Ciayang: mineral maghemite (Fe2O3) kandungan Fe 70% di titik B1, B2, B5.
Magnetic Signatures on River Sediments and Agricultural Soils as Proxy Indicators of Anthropogenic-derived Pollution (Case Study: Cikijing River, Rancaekek, West Java) Dini Fitriani; Widya Utami; Kartika Hajar Kirana; Eleonora Agustine; Siti Zulaikah
Jurnal Penelitian Pendidikan IPA Vol. 7 No. 3 (2021): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v7i3.697

Abstract

A number of activities occur around the Cikijing River in Rancaekek area, West Java, such as industrial and domestic activities. The various activities could decrease the quality of the river and surrounding environment due to anthropogenic pollutants that might be produced. Since the Cikijing River is also used as the source of irrigation, paddy fields around the river could be also be affected. The presence of pollutants in river sediments and agricultural soils over a long period could change their magnetic properties. Magnetic susceptibility of Cikijing River sediments and soils of the paddy fields in the surrounding have been examined considering that magnetic properties could represent environmental conditions. The results show that river sediments have magnetic susceptibility (cLF) in range of 356.2-456.3 (×10-8) m3kg-1, whereas soils samples have cLF varying from 94.1 to 347.1 (×10-8) m3kg-1, suggesting domination of ferrimagnetic minerals. The cFD (%) is <4% indicating the anthropogenic origin of magnetic minerals.  Electron microscopy images show the imperfect octahedral and spherules shapes of magnetic grains that supports magnetic susceptibility analysis about the source of magnetic minerals. Elemental composition analysis reveals Fe and O’s content as main elements, including minor elements of Ca, Mg, Al. Si, Ti and Cr
PETROPHYSICAL ANALYSIS AND SEISMIC STRATIGRAPHY INTERPRETATION TO DETERMINE HYDROCARBON RESERVOIR IN TARAKAN BASIN, BUNYU ISLAND WATERS Daffa Dzakwan Shiddiq; Eleonora Agustine; Tumpal Bernhard Nainggolan; Imam Setiadi; Shaska Zulivandama
BULLETIN OF THE MARINE GEOLOGY Vol 36, No 1 (2021)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.36.1.2021.707

Abstract

Tarakan Basin area of Bunyu Island Waters is known to have hydrocarbon potential with complex geological structures. This study aims to determine reservoir characterization and to obtain prospect of hydrocarbon reservoir zones based on petrophysical and seismic stratigraphy analysis with reference to Well DDS-1 and 2D seismic Line S88. Petrophysical analysis results 3 zones that have potential as hydrocarbon reservoirs. Based on petrophysical quantitative analysis, Zone 1 has values of 52.25% for shale volume, 18.48% for effective porosity, 39.84% for water saturation and 13.03 mD for permeability. Zone 2 has values of 54.66% for shale volume, 10.27% for effective porosity, 40.9% for water saturation and 1.14 mD for permeability. Zone 3 has values of 49.22% for shale volume, 9.33% for effective porosity, 56.33% for water saturation and 0.22 mD for permeability. Out of these three reservoir zones in Well DDS- 1, Zone 1 has the prospect of hydrocarbons which is supported by the net pay value. Based on seismic stratigraphy interpretation, the reservoir zone is correlated to the Tabul Formation, which comprises calcareous clay and limestone.
Co-Authors Achmad Wahyu Pratama Adinda Syifa Azhari Agum Gumelar Prakoso Alamta Singarimbun Anggie Susilawati Anwar, Hairil Bakrun Bakrun Bambang Wijatmoko Budy Santoso Daffa Dzakwan Shiddiq Dini Andriani Dini Fitriani Dini Fitriani Dini Fitriani Dini Fitriani Dini Fitriani Dini Fitriani Dini Fitriani, Dini Eddy Supriyana Fathurrohman, Fahmy Hairil Anwar Harry Mahardika I G. P. F. Soerya Djaja Imam Setiadi Juniarti, Nita Kartika H. Kirana Kartika H. Kirana, Kartika Kartika Hajar Kirana Kartika Hajar Kirana Kartika Hajar Kirana Kartika Hajar Kirana, Kartika Hajar Krishna Agra Pranatikta Ladaya A. Rakhmawati Luh Ayu Eka Safitri Septiana Mahardika, Harry Mechdi Ghazali Mentari, Vanessa Zian Mia Uswatun Hasanah Mileani Shafaria Mokhamad Rizki Ramdhani Muhamad Gina Nugraha Muhamad Gina Nugraha Muhammad Abdillah Budianto Mulyadi, Yudi Nawawi, Muhamad Rovie Nico Andrianto, Nico Novala, Gesti Cita Pepen Supendi Rahma Andini Pratiwi Rahmaputri, Maghfira Dwivani Rhistanto Faturohman Suhanto Richardo Barry Astro Riski Darmasetiawan Rizkita, Nabila Risty Shaska Zulivandama Silvia Jannatul Fajar Siti Zulaikah Srigutomo, Wahyu Trimadona Trimadona Tumpal Bernhard Nainggolan Umar Said Wahyu Srigutomo Wahyu Srigutomo Widya Utami Yudi Rosandi Zaenudinna, Rayna Aulia