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Self Potential Modeling for Investigation of Shallow Structure in Volcanic Region: a Study Case at Domas Crater, Tangkuban Parahu Volcano, West Java Wahyu Srigutomo; Alamta Singarimbun; Adhitya S. Sunarya; Prihandhanu M. Pratomo; Anggie Susilawati; Candra E. Novana; Deny Juanda Puradimaja; Eleonora Agustine
Indonesian Journal of Physics Vol 21 No 2 (2010): Vol. 21 No. 2, April 2010
Publisher : Institut Teknologi Bandung

Quantitative numerical modeling of self-potential (SP) anomaly associated with subsurface electric current density that is attributed to cross-coupling between fluid flow and electrical conductivity distributions has been conducted. The modeling scheme was applied to an area in the vicinity area of Domas crater, Tangkuban Parahu volcano in West Java. The field surveys at domas were conducted from mid-2008 until mid-2009. The main objective of this researchis to obtain a quantitative model that is possible to explain the shallow convective hydrothermal system in the eastern side of the volcano by making comparison between SP anomaly measured on the surface with theoretical anomaly resulted from modeling. Since the modeling scheme requires information on the subsurface resistivity structure, we performed measurement and interpretation of 2-D resistivity at Domas crater. The measurement of CO2 emission that is commonly associated with magmatic gas migration patterns through fracture system was also carried out on the same SP and resistivity lines. Fluid velocity vector was calculated by solving the coupled Darcy’s and energy equations involving heat transfer terms by both convection and conduction. The subsurface electric current source distribution was calculated by solving the coupled equation of velocity and potential gradients. The results show that the fluid flow patterns around Domas Crater which in addition is controlled by topographic effect; it is also influenced by thermal fluid flows through relatively high permeability zone beneath the Domas Crater.

A Numerical Modeling of Formation of Volcanic Geothermal Reservoir Alamta Singarimbun
Indonesian Journal of Physics Vol 21 No 3 (2010): Vol. 21 No. 3, July 2010
Publisher : Institut Teknologi Bandung

The aim of the research is to develope the thermal energy from volcanic geothermal reservoir. One of the prospec of the geothermal energy for the future is the utilization of volcanic geothermal reservoir. The using of numerica simulation is important to clarify the thermal processes in a fluid reservoir beneath an active volcano. The fluid reservoir is a permeable zone, where the magmatic water discharged from magma mixes with the downgoing meteoric water. The flow rate of magmatic water becomes the mass and energy input to the reservoir. Finally, the fluid go to the earth’s surface as vapor and liquid. The main physical parameters of the fluid reservoir cover pressure, temperature, enthalpy and enthalpy. The Finite Difference Method based on mass and heat balance equations is used to obtain these parameters. The parameters reperesent the thermal state of the fluid in the reservoir. The fluid phase in the reservoir changes with time. These processes interpret the development of the energy in a geothermal reservoir.

One Dimension Spring Supported Ball on Top of a Sinusoidal Vibrating Plate: A Forced Oscillation Simulation using Molecular Dynamics Method Sparisoma Viridi; Wahyu Srigutomo; Alamta Singarimbun; Wahyu Hidayat; Sitti Balkis
Indonesian Journal of Physics Vol 22 No 2 (2011): Vol. 22 No. 2, April 2011
Publisher : Institut Teknologi Bandung

A ball supported by a spring is set on top of a plate which is sinusoidal vibrated. The motion is limited to one dimension motion. It is assumed that the spring is an ideal one with zero mass. The vibrating plate is considered much heavier than the ball, so that the ball motion has no influence on the plate motion. Plate vibration frequency is varied around the frequency of ball-spring system. Resonance phenomenon is reported, which needs a phase match condition to occur.

Aplikasi Metode Volumetrik dalam Estimasi Potensi Panas Bumi Berdasarkan Parameter Fisis Reservoir (Studi Kasus Daerah Panas Bumi “Z”) Latifah Nurul Qomariyatuzzamzami; Zuhdiyah Matienatul Iemaaniah; Alamta Singarimbun
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 9, No 2 (2023)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/gravity.v9i2.20474

Geothermal is a renewable energy strategically developed in Indonesia, but its utilization has not been maximized. Geothermal exploration requires high costs, so estimating energy reserves in potential areas is essential. This study was conducted to determine the electrical energy potential of geothermal area "Z" by volumetric method and determine the influence of saturation, porosity, and length of generation time on the potential of geothermal electrical energy. The volumetric method used is the lumped parameter model. The calculation was carried out with variations in water saturation 0% - 80%, rock porosity 10% - 40%, and the length of generation time 25 - 40 years. The highest estimated electrical energy of geothermal area "Z" is 188 MWe obtained at 80% water saturation, 10% porosity, and 25 years generation duration, while the lowest is 80 MWe obtained with 0% water saturation, 40% porosity, and 40 years of generation duration. At the same porosity, the greater the water saturation, the greater the value of geothermal electricity reserves of the area "Z." The greater the porosity, the greater the effect of increasing water saturation on increasing electrical energy reserves. The large porosity of rocks causes their energy to be smaller since the heat dominance of geothermal regions "Z" is given by the heat of rocks. The length of generation time affects the amount of geothermal electrical energy, that is, the longer the production time, the smaller the reserve.

SIMULASI ALIRAN KONVEKSI FLUIDA DI DAERAH RESERVOIR PANAS BUMI Alamta Singarimbun; Famelia Nurlela
Jurnal FisTa : Fisika dan Terapannya Vol 1 No 1 (2020): APRIL
Publisher : Fakultas Matematika Ilmu Pengetahuan Alam dan Kebumian, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53682/fista.v1i1.59

The potential of geothermal energy can be determined by the potential classification based on performed simulation. The simulation results show the quality of geothermal energy utilization can be optimized. Under natural conditions, a geothermal system consists of a heat source, the bedrock layer, reservoir layer, and caprock layers. The process of conduction heat transfer occurs when a heat source to transfer heat to the bedrock and bedrock is heat transfer by convection to the reservoir. The heat transfer process makes the temperature at any depth is different and will change with time. Numerical simulation and modeling of two-dimensional sebara done to simulate the fluid temperature in the geothermal reservoir which satisfies equations of fluid flow in a porous medium for single-phase flow (Darcy's law). The observed parameters are the temperature distribution, pressure, and direction of fluid flow in a reservoir. Didiskritisasi mathematical equations using finite difference or difference-up. The computational process is done by using Matlab software

INOVASI PENERANGAN: LILIN SEBAGAI ALTERNATIF ENERGI LISTRIK BERBASIS TERMOELEKTRIK. SEBUAH KAJIAN EKSPERIMENTAL Harapan Marpaung; Mitra Djamal; Linus Pasasa; Alamta Singarimbun; Wahyu Srigutomo; Ni Ketut Lasmia
Jurnal Review Pendidikan dan Pengajaran (JRPP) Vol. 6 No. 4 (2023): Volume 6 No 4 Tahun 2023
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jrpp.v6i4.22628

Teknologi pembangkit listrik berbasis termoelektrik (Thermoelectric Generator /TEG) adalah salah satu metode konversi energi panas menjadi energi listrik secara langsung jika terjadi perbedaan suhu antara sisi panas Th dan sisi dingin Tc antara kedua sisi TEG. Salah satu penyebab perkembangan teknologi termoelektrik belum menggembirakan, karena efisiensi TEG yang tersedia saat ini secara komersil masih relatip rendah, umumnya masih berkisar antara 4 % hingga 5%, dan efisiensinya akan masih berkurang jika sudah menghasilkan listrik. Pemanfaatan teknologi ini masih terbatas pada suhu tinggi (>200 °C) sedangkan untuk suhu rendah (<150 °C) belum banyak menarik minat para peneliti. Karakteristik termoelektrik yang khas yakni sekecil apapun beda suhu antara sisi panas dan sisi dingin pasti akan menghasilkan energi listrik dan dalam penelitian ini akan dikembangkan suatu perangkat yang dapat menghasilkan energi listrik hingga 1 watt dengan sumber panas dari lilin. Pada eksperimen ini akan dikaji bahwa lilin dapat menjadi sumber energi listrik berbasis termoelektrik untuk penerangan masa depan. Tipe termoelektrik yang digunakan pada eksperimen ini adalah TEC1-12706, SP1848 dan TEG1-241-01.4-1.2.

DELINEASI RESERVOIR PANAS BUMI BERDASARKAN LITOLOGI, ALTERASI HIDROTERMAL DAN PROFIL TEMPERATUR -, Cyrke A.N. Bujung; -, Alamta Singarimbun; -, Dicky Muslim; -, Febri Hirnawan; -, Adjat Sudradjat
Bulletin of Scientific Contribution Vol 8, No 3 (2010): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

This study aims to delineate the breadth and depth of the geothermal reservoir and the resulting temperature. The method used is a compilation of lithology, alteration and the temperature profile that is supported by literature references and well data. Delinasi prospect area and deep reservoir of data viewed by lithology, alteration and the temperature profile. Regional prospects in the region of 2000C or more temperatures are also characterized by the presence of epidote minerals and are on lava and pyroclastic stratigraphy perselingan. The results obtained two different reservoir sites, the first located at depths of 800-1300 m above sea level and an area reached 1.37 x 107 m2., While the second is located at a depth (900 m - bottom) and an area of more than 3, 38 x 106 m2. Based on the temperature profile, the type of prospect geothermal reservoir in this area is the type of dominance of steam. .

Pemberdayaan Karang Taruna dalam Sirkular Ekonomi Pengelolaan Sampah dan Pertanian Organik Skala Rumah Tangga Pasasa, Linus; Alamta Singarimbun; Wahyudi Parnadi
Mitra Teras: Jurnal Terapan Pengabdian Masyarakat Vol. 4 No. 1 (2025): Mitra Teras: Jurnal Terapan Pengabdian Masyarakat, Volume 4 Number 1, June 2025
Publisher : PT. Mitra Jurnal Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58797/

This community service program aims to empower local community partnerships by equipping residents with knowledge and problem-solving skills that are comprehensive, meaningful, thorough, and sustainable. It does so through the application of the circular economy concept, which seeks to extend the life cycle of products, raw materials, and available resources so that they can be used for as long as possible. This concept emphasizes the importance of conserving resources by reducing waste and recycling materials after their use, thereby creating a sustainable loop. It is an innovative approach that not only has the potential to reduce negative environmental impacts but also opens new economic opportunities through the development of sustainable businesses. The target partner of this program is the economically unproductive youth community group Karang Taruna PAKUPAYUNG, located in Pasirlayung Urban Village, Cibeunying Kidul District, Bandung City. The objective of this community engagement initiative is to empower Karang Taruna PAKUPAYUNG by utilizing plastic recycling within the framework of a circular economy in household-scale waste management and organic farming. The ultimate goal is to achieve zero waste and support food security in the Pasirlayung community. The results of the analysis indicate a significant increase in knowledge among the Karang Taruna PAKUPAYUNG members regarding "Zero Waste Management" and household-scale organic farming. Abstrak Kegiatan pengabdian masyarakat ini bertujuan untuk pemberdayaan kemitraan masyarakat dengan cara membekali masyarakat pengetahuan dan keterampilan yang problem solving, komprehensif, bermakna, tuntas dan berkelanjutan, melalui penerapan konsep sirkular ekonomi yang berupaya memperpanjang siklus hidup dari suatu produk, bahan baku, dan sumber daya yang ada agar dapat dipakai selama mungkin. Konsep ini menekankan pentingnya menjaga sumber daya dengan cara mengurangi limbah, mendaur ulang kembali setelah masa pakai mereka berakhir, menciptakan lingkaran yang berkelanjutan. Ini adalah pendekatan inovatif yang tidak hanya berpotensi mengurangi dampak lingkungan negatif, tetapi juga dapat membuka peluang ekonomi baru melalui pengembangan bisnis yang berkelanjutan. Mitra sasaran masyarakat dari kegiatan ini adalah masyarakat yang tidak produktif secara ekonomi yaitu Karang Taruna PAKUPAYUNG, Kel. Pasirlayung, Kec.Cibeunying Kidul Kota Bandung. Tujuan program pengabdian masyarakat ini adalah pemberdayaan karang taruna PAKUPAYUNG dalam memanfaatkan daur ulang plastik dalam konteks sirkular ekonomi pengelolaan sampah dan pertanian organik skala rumah tangga untuk mewujudkan zero waste dan mendukung ketahanan pangan di kelurahan Pasirlayung kota Bandung. Hasil analisis menunjukkan bahwa terjadi peningkatan pengetahuan tentang “Zero Waste managemen” Karang Taruna PAKUPAYUNG dan pertanian organik skala rumah tangga.

Pemberdayaan Karang Taruna dalam Sirkular Ekonomi Pengelolaan Sampah dan Pertanian Organik Skala Rumah Tangga Pasasa, Linus; Singarimbun, Alamta; Parnadi, Wahyudi
Mitra Teras: Jurnal Terapan Pengabdian Masyarakat Vol. 4 No. 1 (2025): Mitra Teras: Jurnal Terapan Pengabdian Masyarakat, Volume 4 Issue 1, June 2025
Publisher : MJI Publisher by PT Mitra Jurnal Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58797/teras.0401.04

This community service program aims to empower local community partnerships by equipping residents with knowledge and problem-solving skills that are comprehensive, meaningful, thorough, and sustainable. It does so through the application of the circular economy concept, which seeks to extend the life cycle of products, raw materials, and available resources so that they can be used for as long as possible. This concept emphasizes the importance of conserving resources by reducing waste and recycling materials after their use, thereby creating a sustainable loop. It is an innovative approach that not only has the potential to reduce negative environmental impacts but also opens new economic opportunities through the development of sustainable businesses. The target partner of this program is the economically unproductive youth community group Karang Taruna PAKUPAYUNG, located in Pasirlayung Urban Village, Cibeunying Kidul District, Bandung City. The objective of this community engagement initiative is to empower Karang Taruna PAKUPAYUNG by utilizing plastic recycling within the framework of a circular economy in household-scale waste management and organic farming. The ultimate goal is to achieve zero waste and support food security in the Pasirlayung community. The results of the analysis indicate a significant increase in knowledge among the Karang Taruna PAKUPAYUNG members regarding "Zero Waste Management" and household-scale organic farming. Abstrak Kegiatan pengabdian masyarakat ini bertujuan untuk pemberdayaan kemitraan masyarakat dengan cara membekali masyarakat pengetahuan dan keterampilan yang problem solving, komprehensif, bermakna, tuntas dan berkelanjutan, melalui penerapan konsep sirkular ekonomi yang berupaya memperpanjang siklus hidup dari suatu produk, bahan baku, dan sumber daya yang ada agar dapat dipakai selama mungkin. Konsep ini menekankan pentingnya menjaga sumber daya dengan cara mengurangi limbah, mendaur ulang kembali setelah masa pakai mereka berakhir, menciptakan lingkaran yang berkelanjutan. Ini adalah pendekatan inovatif yang tidak hanya berpotensi mengurangi dampak lingkungan negatif, tetapi juga dapat membuka peluang ekonomi baru melalui pengembangan bisnis yang berkelanjutan. Mitra sasaran masyarakat dari kegiatan ini adalah masyarakat yang tidak produktif secara ekonomi yaitu Karang Taruna PAKUPAYUNG, Kel. Pasirlayung, Kec.Cibeunying Kidul Kota Bandung. Tujuan program pengabdian masyarakat ini adalah pemberdayaan karang taruna PAKUPAYUNG dalam memanfaatkan daur ulang plastik dalam konteks sirkular ekonomi pengelolaan sampah dan pertanian organik skala rumah tangga untuk mewujudkan zero waste dan mendukung ketahanan pangan di kelurahan Pasirlayung kota Bandung. Hasil analisis menunjukkan bahwa terjadi peningkatan pengetahuan tentang “Zero Waste managemen” Karang Taruna PAKUPAYUNG dan pertanian organik skala rumah tangga.

ANALISIS POTENSI LIKUIFAKSI DI DAERAH SERANGAN BALI SELATAN MENGGUNAKAN METODE PROBABILISTIK DAN METODE GROUND PENETRATING RADAR (GPR) Putri, Maya Efiarni Eka; Siregar, Rahmat Nawi; Singarimbun, Alamta
Jurnal Riset Fisika Indonesia Vol 1 No 2 (2021): Juni 2021
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v1i2.1865

Liquefaction causes physical damage on land and has potential to cause more fatalities. In addition, southern part of Bali Island is one of the tourist destination areas with quite high liquefaction potential due to soil condition and large number of potential earthquakes. Research on liquefaction potential analysis at Serangan, Southern Bali was conducted by using probabilistic and ground penetrating radar (GPR) methods. This research aims to obtain information on shallow layers, land subsidence dueto earthquakes theoretically, and probability of liquefaction occurrences in the area of Serangan, Southern Bali by considering several parameters, such as Bali earthquake (2020) and Lombok earthquake (2018). The GPR data was processed by ReflexW 7.0 software, and probabilistic by Microsoft Excel 2010. The probabilistic and GPR results indicated ground water level was at 2 m depth and the liquefaction occurrence was 92.22% with ground acceleration of 0.5749 gal at 3.5 m in depth, which was 10 km away from epicenter due to an earthquake with a magnitude of 7.7. Keywords: Ground Water Level; Land Subsidence; Probability; ReflexW 7.0 Software

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