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All Journal Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience Jurnal RISET Geologi dan Pertambangan Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Journal of Geoscience, Engineering, Environment, and Technology JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Indonesian Journal of Chemistry Buletin Sumber Daya Geologi Indonesian Journal on Geoscience Indonesian Journal on Geoscience Journal La Lifesci Edu Cendikia: Jurnal Ilmiah Kependidikan Jurnal Multidisiplin Madani (MUDIMA) Journal of Geosciences and Applied Geology

Boy Yoseph Cahya Sunan Sakti Syah Alam

Fakultas Teknik Geologi, Universitas Padjadjaran

Author-ID : 568176

Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Physics Social Sciences Other

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Isotope and Geochemistry Characterization of Hot Springs and Cold Springs of Sembalun – Rinjani Area, East Lombok, West Nusa Tenggara – Indonesia Satrio Satrio; Rasi Prasetio; Boy Yoseph Cahya Sunan Sakti Syah Alam; Teuku Yan Waliyana Muda Iskandarsyah; Faizal Muhammadsyah; Mohamad Sapari Dwi Hadian; Hendarmawan Hendarmawan
Indonesian Journal of Chemistry Vol 20, No 6 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.50790

The presence of several hot springs in Sembalun – Rinjani, East Lombok, West Nusa Tenggara is an indicator of geothermal potential in the area. This study aims to determine the characteristics of hot springs and cold springs and also the geothermal potential in Sembalun – Rinjani area using isotopes and geochemistry methods. The result of d18O and d2H stable isotopes analysis shows that most of the hot springs are meteoric water. Except for Kalak hot spring, other hot springs are a mixing product of meteoric water and andesitic water, with meteoric water composition between 64 to 87%. While 14C radioisotope suggests that the age of hot springs in the Sembalun area is about 10,000–12,000 years BP, the surrounding cold springs are mostly Modern except Jorong cold spring. The results of gas analysis (He, Ar, and Ne) also suggest the same origin of geothermal fluid, i.e., meteoric water origin. Based on chemical composition, Kalak hot spring is plotted as sulfate type water, while Sebau hot spring is plotted near mature water composition but not representing reservoir fluid due to its relatively low temperature and high Mg content. Na/K geothermometer calculation from Sembalun area shows that subsurface temperature is varied between 111-161 °C, while from Rinjani hot springs indicates higher subsurface temperature, i.e., 250-260 °C. It is estimated that reservoir fluid has high TDS with chloride content up to 4000 mg/L.

Vertical Electrical Sounding Exploration of Groundwater in Kertajati, Majalengka, West Java, Indonesia Gumilar Utamas Nugraha; Boy Yoseph CSSSA; Andi Agus Nur; Pulung Arya Pranantya; Lina Handayani; Rachmat Fajar Lubis; Hendra Bakti
Indonesian Journal on Geoscience Vol. 8 No. 3 (2021)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.8.3.359-369

DOI:10.17014/ijog.8.3.359-369Continuously increasing population and progressive infrastructural development in the region of Kertajati International Airport, Indonesia, emphasize the need to develop a sustainable water supply network. Airport facilities require sufficient water resources, which can be obtained from surface water and groundwater. Groundwater exploration can provide necessary information for assessing water resources. The purpose of this study is to analyze the configuration of aquifers in the studied area. A Schlumberger array was used to carry out twelve vertical electrical soundings (VES) with AB/2 electrode spacing ranging from 1.5 m to 150 m. IPI2win software was used to qualitatively interpret the VES results and it suggested the presence of three distinct lithological units interpreted as clay, alluvial sand, and a Lower Quaternary formation. In general, resistivity values in the studied area can be divided into five resistivity categories: very low resistivity with values ranging from 1 Ωm to 10 Ωm, low resistivity with values ranging from 10 Ωm to 50 Ωm, medium resistivity with values ranging from 50 Ωm to 100 Ωm, high resistivity with values ranging from 100 Ωm to 200 Ωm, and very high resistivity with values > 200 Ωm. The geo-electric interpretation revealed three geo-electric layers: topsoil (1 - 144 Ω m), sand (1 - 298 Ω m), and clay (1 - 82 Ω m). Aquifers in the studied area are lithologically composed of sand. Clay is the dominant lithology in the studied area, so the presence of aquifers in this area is very limited, and thus the supply of groundwater is also limited. The exploitation of groundwater must be limited and controlled to maintain the sustainability of groundwater in the studied area.

Groundwater Potential of the East and North Sides of Gunungmasigit Village: A Case Study Wijaya, Dwi Suyandi Pasa; Iskandarsyah, Teuku Yan W. M.; Yoseph, Boy
Journal La Lifesci Vol. 5 No. 1 (2024): Journal La Lifesci
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallalifesci.v5i1.1039

The purpose of this research is to conduct a groundwater survei by analyzing the availability of groundwater on the east and north sides of Gunungmasigit Village, Kec. cipatat, kab. west bandung (case study: PPSDM Geominerba field campus KESDM). The aim of this study was to determine the potential for groundwater in the northern area of the PPSDM Geominerba Field Campus and to find information regarding the absence of groundwater after drilling was carried out in 2019 in the area on the east side of the PPSDM Geominerba Field Campus. The research administrative area is located in Gunungmasigit Village, Kec. Cipatat, Kab. West Bandung (PPSDM Geominerba field campus KESDM). The author will focus more on the end of Cipatat-1 (north side) on the map, where it is located in the gate area of the Geominerba PPSDM Field Campus. This study uses the geoelectrical measurement method. One of the geoelectrical methods is the resistivity or resistivity method. This method studies the subsurface structure based on the different resistivity values in the rock with depth. Data analysis used IPI2WIN Software with track 1 having a length of 200 meters and track 3 having a length of 400 meters. In the results of Cipatat-1 it is suspected that there is a water-carrying layer at a depth of 11.9 – 45.9 m. Meanwhile, the results of Cipatat-3 suggest that there is a water-carrying layer at a depth of 26.3 m.

SOIL SLOPE REINFORCEMENT USING CANTILEVER RETAINING WALL ON THE WEST RING ROAD OF SADAWARNA DAM, SUBANG DISTRICT Rizki, Afdal; Alam, Boy Yoseph Cahya Sunan Sakti Syah; Khoirullah, Nur; Sophian, Raden Irvan; Firmansyah, Yusi
Journal of Geological Sciences and Applied Geology Vol 7, No 3 (2023): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v7i3.50433

The research was conducted in the West Ring Road of Sadawarna Dam, Subang Regency. This research aims to provide recommendations for the design of cantilever retaining wall to increase the value of the slope safety factor in the research area. Calculation of the value of the slope safety factor uses the limit equilibrium method with the Janbu calculation method. In actual conditions, the value of the slope safety factor shows an unstable value referring to SNI 8460:2017, namely in static conditions with a vehicle load is 1.31 and in pseudostatic conditions with a vehicle load is 1.083. Slope strengthening was carried out using cantilever retaining wall. The retaining wall design that has been made meets the criteria for stability against overturning, stability against sliding, and stability for the bearing capacity of the soil. The safety factor value for slope with retaining wall shows a stable FS value referring to SNI 8460:2017, namely 1.53 in static conditions with vehicle loads and 1.11 in pseudostatic conditions with vehicle loads. Keyword: slope, safety factor, retaining wall, cantilever

Gambaran Entrepreneurial Self-Efficacy pada Mahasiswa UNPAD yang Menjalani Magang MSIB: Entrepreneurial Self-Efficacy Overview of UNPAD Students Undergoing MSIB Internship Wijayanti, Puspita Adhi; Amalia , Rosaria Mita; Alam , Boy Yoseph Cahya Sunan Sakti Syah
Edu Cendikia: Jurnal Ilmiah Kependidikan Vol. 4 No. 03 (2024): Research Articles, December 2024
Publisher : ITScience (Information Technology and Science)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47709/educendikia.v4i03.5268

Entrepreneurial self-efficacy (ESE) is quite essential for starting a business. Many MSIB participants are interning at companies, which concerns the UNPAD Career Development Center regarding students' ESE. The study was conducted using a survey method: distributing a Google Forms questionnaire to the interns. The online process was used considering the location of the participants, who were spread out because they were undergoing an internship. The survey results showed that most students had relatively high ESE scores. The analysis of the difference test showed no significant difference in the scientific cluster and parental background, but the Science and Technology and Agrocomplex clusters had the highest average interest. Students with parents who work as entrepreneurs also have a higher level of confidence than students with parents who work as civil servants or private employees, BUMN and BUMD. Students' interest in entrepreneurship and ESE also show a significant relationship so that self-confidence will impact their interest in entrepreneurship, and they are expected to survive and develop. Parents' jobs and asking students to influence students' confidence in entrepreneurship. In addition, the Science and Technology and Agrocomplex clusters showed higher self-confidence in entrepreneurship. This study suggests providing entrepreneurial containers/opportunities for students to improve their entrepreneurial skills. In addition, a mentoring program is also needed to help students survive in their businesses and develop them into bigger businesses.

OPTIMALISASI PEMANFAATAN SISTEM AGROFORESTRI SEBAGAI BENTUK ADAPTASI DAN MITIGASI TANAH LONGSOR Rendra, Pradnya Raditya; Sulaksana, Nana; Alam, Boy Yoseph C.S.S.S.
Bulletin of Scientific Contribution Vol 14, No 2 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Landslide is a natural disaster that often occur in Indonesia and cause a significant impact. Landslide may occur due to static factor (slope) and dynamic factor (land use). Landslide mitigation can be done to prevent the negative impact of landslide. Landslide mitigation through slope stabilization can be done with vegetative technique. Vegetative technique as a landslide mitigation with sustainable land production is also known as agroforestry. Agroforestry is a land use systems made by various technologies through the utilization of annual crops, perennial crops, and/or livestock , either alternately or at the same time in a certain period to form ecological, social, and economic interactions. Agroforestry system has more advantages than other land use systems. One of the advantage of this system is can be used on steep slope area. Multistory agroforestry system can prevent landslide by forming soil organic material, improving soil structure, and making soil more stable. Utilization of multistory agroforestry system with various types of storied canopy trees considered as appropiate landslide mitigation because the closure of canopy tress are tightly and stratified, their root system is excellent, and the soil cover such as grasses and shrubs is important to prevent landslide. Furthermore, agroforestry system can also be used to produce food crops, fodder, honey, building materials, and medicinal materials. Keyword : Agroforestry, mitigation, slope, landslide. Tanah longsor merupakan bencana alam yang sering terjadi di Indonesia dan menimbulkan dampak cukup besar. Tanah longsor dapat terjadi akibat faktor statis (kemiringan lereng) dan faktor dinamis (tata guna lahan). Mitigasi tanah longsor dilakukan untuk mencegah dampak negatif tanah longsor. Mitigasi tanah longsor melalui stabilisasi lereng dapat dilakukan dengan rekayasa vegetatif. Rekayasa vegetatif sebagai mitigasi tanah longsor dengan produksi lahan berkelanjutan tersebut disebut juga sebagai sistem agroforestri. Agroforestri merupakan sistem penggunaan lahan yang dilakukan dengan berbagai teknologi melalui pemanfaatan tanaman semusim, tanaman tahunan, dan/atau ternak dalam waktu bersamaan atau bergiliran pada periode tertentu sehingga terbentuk interaksi ekologi, sosial, dan ekonomi. Sistem agroforestri memiliki lebih banyak kelebihan dibandingkan sistem penggunaan lahan lain. Salah satu kelebihan sistem ini adalah dapat digunakan pada lahan berlereng curam. Sistem agroforestri multistrata dapat mencegah tanah longsor dengan membentuk bahan organik tanah, memperbaiki struktur tanah, dan membuat tanah menjadi lebih stabil. Pemanfaatan sistem agroforestri multistrata dengan berbagai jenis tanaman tajuk bertingkat dinilai sebagai langkah tepat mitigasi tanah longsor karena adanya penutupan tajuk pepohonan yang rapat dan bertingkat, sistem perakaran yang sangat baik, serta penutup tanah berupa rerumputan dan semak belukar yang sangat penting untuk menghindari tanah longsor. Selain itu, sistem agroforestri juga dapat dimanfaatkan sebagai penghasil bahan pangan, pakan ternak, madu, bahan bangunan, dan bahan obat. Kata kunci :Agroforestri, mitigasi, lereng, longsor.

KONDISI GEOLOGI TEKNIK PASIR LEPAS TERHADAP PERENCANAAN DAN PRE-DESAIN BENDUNGAN TIPE URUGAN (EARTH DAM) DI DESA KANDANG AMPEK, KABUPATEN PARIAMAN, SUMATERA BARAT -, Boy Yoseph
Bulletin of Scientific Contribution Vol 5, No 2 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The Observatory area include in the fisiography of Rangkaian Pegunungan Barisan Barat, which is located at the elevation +604 m until +620 m above the sea level. Geologically is consist of two unit geomorphology, i.e geomorphology unit of breccia volcanic hilly extremely steep and geomorphology unit of breccia tuff hilly slope. These geomorphology condition in caused the hydraulic gradient quite high and so the speed of current surface water too. Litology of the observatory area is breccia volcanic. The geology structure of the observatory area which is holding a role is not found, but there are joints in several locations. Which were assumsed come from the tectonic activity which developed along the Sumatera Fault (Semangko Fault).Based on soil mecanic datas, the dam material has a relative session = 0 . Where as the (C) valve (cohessi) is very small, because of that the soil bearing capacity is very small, and its necessary to make a foundation. One of many years to increase Dr (relative session) from those material to mix soil (soil mixing) (to add the component cohesive /silt and clay). The Observatory area included to the earthquake area, so type of dam is earth dam. clay core on dam body is required to decrease the seepage. Dam body is consisted with the comparation of soil mix 9:1:0 and 8:1:1.

KARAKTERISTIK SISTEM HIDROGEOLOGI KARST BERDASARKAN ANALISIS HIDROKIMIA DI TELUK MAYALIBIT, RAJA AMPAT Endah, Raras; Yoseph, Boy; Sukiyah, Emi; Setiawan, Taat
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v15i3.15100

ABSTRAKKarst Teluk Mayalibit memiliki sistem hidrogeologi yang unik karena sebagian pola aliran bukan berasal dari kawasan karst itu sendiri. Penelitian sistem hidrogeologi karst ini dilakukan dengan menggunakan analisis hidrokimia yang dikompilasi dengan observasi hidrogeologi di lapangan. Berdasarkan analisis data hidrokimia seperti temperatur, derajat keasaman (pH), tekanan parsial terhadap CO2 (PCO2), dan indeks kejenuhan terhadap kalsit (SIkalsit) menunjukan bahwa pada elevasi 40-80 mdpl termasuk dalam zona transisi dengan sifat sistem aliran terbuka atau rongga, sedangkan pada elevasi 20-40 mdpl analisis hidrokimia menunjukan bahwa elevasi ini termasuk zona aliran menerus dengan sifat sistem aliran tertutup atau difusi. Kata Kunci : Karst, Sistem Hidrogeologi, Hidrokimia, Sistem Aliran, Teluk Mayalibit.ABSTRACT Karst of Mayalibit Bay has a unique hydrogeological system because some flow patterns are not from karst area itself. Karst of hydrogeological system research is done by using hydro chemical analysis which is compiled by hydrogeological observation in the field. Based on analysis of hydro chemical data such as temperature, degree of acidity (pH), partial pressure on CO2 (PCO2), and saturation index of calcite (SIcalcite) showed that at elevation 40-80 mdpl included in transition zone with open flow system or cavity, 20-40 mdpl hydro chemical analysis indicates that this elevation includes a continuous flow zone with the nature of the closed flow system or diffusion. Keywords: Karst, Hydrogeology System, Hydro chemical, Flow System, Mayalibit Bay.

PERAN SESAR TERHADAP KARAKTER DAN ARAH ALIRAN AIRTANAH PADA ENDAPAN VOLKANIK DI LERENG TENGGARA G. GEDE, KABUPATEN CIANJUR, JAWABARAT -, Ismawan T.; -, Yudi Rahayudin; -, Boy Yoseph CSSSA; -, Bombom Rahmat Suganda; -, Nursiyam Barkah
Bulletin of Scientific Contribution Vol 11, No 1 (2013): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Volcano as high morphology feature acts as a good water catchment and recharge area. This area also has a volcanic deposition characteristic that changes within a near range, and usually has complex geological structures that effects the groundwater systems. The aim of this study is to identity the role of faults toward groundwater conditions, determine facies and shallow groundwater flow based on the water table. The study area is in a volcanic deposition aquifer system that is composed of lapilli tuff, volcanic breccias, and sand. The occurance of several springs with groundwater conditions are controlled by faults and fractures. Physical characteristics of the water comprises, EC=104μS/cm -490 μS/cm, TDS = 49 mg/L- 240 mg/L, pH 4,2 – 8,6, Temperature 20,4°C – 26°C, debit 0,05 L/sec up to 100 L/sec. Chemical facies of the water is divided into three types: Ca, HCO3, Ca, Mg HCO3 and Mg, Ca HCO3.The direction of the shallow groundwater flow generally follows the topographics features with a direction northwest-southeast.

PERAN CITRA SATELIT LANDSAT 8 DALAM IDENTIFIKASI TATA GUNA LAHAN DI WILAYAH KABUPATEN SUMEDANG RADITYA RENDRA, PRADNYA PARAMARTA; Sulaksana, Nana; Alam, Boy Yoseph C. S. S. S
Bulletin of Scientific Contribution Vol 17, No 2 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Kegiatan penelitian dilakukan di Kabupaten Sumedang yang memiliki keragaman jenis tata guna lahan. Penelitian ini dilakukan untuk mengetahui peran citra satelit Landsat 8 dalam mengungkap jenis tata guna lahan di daerah penelitian. Penelitian ini dilakukan melalui analisis citra Landsat 8 dengan dukungan Sistem Informasi Geografis di studio dan observasi ke lapangan untuk mengecek langsung jenis tata guna lahan di daerah penelitian. Perangkat lunak ArcGIS 10.0 dengan Sistem Informasi Geografis digunakan untuk mengolah dan menganalisis citra satelit Landsat 8. Berdasarkan hasil penelitian, daerah penelitian dapat dibedakan menjadi 4 kawasan, yaitu kawasan pemukiman, hutan, budidaya (ladang, kebun, dan sebagainya), serta perairan dan lahan basah (sawah). Kawasan pemukiman terkonsentrasi di daerah berkembang seperti Jatinangor, Tanjungsari, Sumedang Selatan, dan Sumedang Utara. Kawasan hutan tersebar di beberapa daerah namun sebagian besar berada di bagian selatan daerah penelitian. Kawasan budidaya dan lahan basah seperti sawah sebagian besar merupakan hasil konversi lahan kawasan hutan sehingga letaknya berdekatan dengan kawasan hutan. Kata kunci : ArcGIS, citra Landsat 8, Sistem Informasi Geografis, Sumedang, tata guna lahan

Co-Authors Andi Agus Nur Arief Nur Muchamad Asri Arifin Bakti, Hendra Bombom Rahmat Suganda -, Bombom Rahmat Suganda Deden Zaenudin Mutaqin Dwi Suyandi Pasa Wijaya Emi Sukiyah Endah, Raras Euis Tintin Yuningsih Faizal Muhammadsyah Febriwan Mohammad Gumilar Utamas Nugraha Hadi Hidayat Handayani, Lina Hendarmawan Hendarmawan Hendarmawan, . Hendra Bakti Iskandarsyah, Teuku Yan W. M. Ismawan T. -, Ismawan T. Khoirullah, Nur Lina Handayani Lubis, Rachmat Fajar Mega Fatimah Rosana Mohamad Sapari Hadian Mohammad Sapari Dwi Hadian Muhammad Kurniawan Alfadli Nana Sulaksana Nandian Mareta Nofi Muhammad Alfan Asghaf Nugraha, Gumilar Utamas Nursiyam Barkah -, Nursiyam Barkah Pradnya Paramarta Raditya Rendra Pradnya Raditya Rendra, Pradnya Raditya Pranantya, Pulung Arya Pulung Arya Pranantya Puspita Adhi Wijayanti Rachmat Fajar Lubis Rachmat Fajar Lubis Raden Irvan Sophian Rasi Prasetio Reza, Teuku Rizki, Afdal Rosaria Mita Amalia Sabila, Zahra Syahida Satrio Satrio Septio, Ghenady Taat Setiawan, Taat Teuku Yan W M Iskandarsyah Teuku Yan Waliana Muda Iskandarsyah Teuku Yan Waliyana Muda Iskandarsyah Ulfa Yusti Undang Mardiana Wijaya, Dwi Suyandi Pasa Wijayanti, Puspita Adhi Yudi Rahayudin -, Yudi Rahayudin Yusi Firmansyah, Yusi Zufialdi Zakaria

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