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Nofrohu Retongga
Universitas Teknologi Sumbawa
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation

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Peningkatan Konsep Dasar Teknik Eksplorasi Bagi Asisten Praktikum Program Studi Teknik Pertambangan Universitas Teknologi Sumbawa Sayidatina Hayatuzzahra; Nofrohu Retongga; Ahmad Husnul Fiqri; Samsun Samsun; Aghib Dirgantara; Rizaldi Rizaldi; Aqmal Septian Hakim; Veri Irshapratama; Alfal Gilang Ramadhan; Indah Aprianti; Popi Jolia Salia; Bayu Syakiran
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 5 No. 2 (2024): Jurnal Pengabdian kepada Masyarakat Nusantara (JPkMN)
Publisher : Cv. Utility Project Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55338/jpkmn.v5i2.3160

Abstract

Tujuan utama dalam pengabdian ini adalah untuk meningkat pemahaman konsep dasar teknik eksplorasi di lapangan bagi asisten praktikum dan mahasiswa, dikarenakan praktikum teknik eksplorasi sangat penting bagi mahasiswa teknik pertambangan, jika asisten telah mampu menguasai konsep dasar teknik eksplorasi maka dapat membantu dosen dalam mengajar dipraktikum sehingga berjalan dengan baik, terarah, sesuai harapan, dan seluruh mahasiswa mampu melakukan serta menerapkan konsep dasar teknik ekslorasi di indutri pertambangan mineral, Batubara dan batuan setelah lulus S1 Teknik Pertambangan. Pembelajaran dan pelatihan Mata Kuliah Teknik Eksplorasi sebagai mata kuliah Wajib di Kurikulum Program Studi Teknik Pertambangan Universitas Teknologi Sumbawa sangat penting. Pemahaman konsep dasar teknik eksplorasi bagi asisten praktikum dan mahasiswa Teknik Pertambangan Angkatan 2022 sangat meningkat, mampu menguasai konsep dasar dan terarah setelah dilakukan pelatihan di lapangan dan ujian tertulis di laboratorium. Hal tersebut terbukti setelah pelatihan di lapangan para asisten mampu membantu dosen dalam menjelaskan dan tata cara eksplorasi kepada seluruh mahasiswa Teknik Pertambangan yang ikut serta pada saat praktikum teknik eksplorasi di Desa Lape, Desa Lopok dan Desa Pemasar. Meningkatnya pemahaman konsep dasar serta penerapan di lapangan ini menjadi bekal mahasiswa Teknik Pertambangan dalam bekerja di industri pertambangan terkhususnya di bidang eksplorasi mineral, Batubara dan batuan.
Rekomendasi Penguatan Lereng Untuk Mengurangi Dampak Bencana Longsor Kepada Masyarakat di Sepanjang Jalan Utama Karanggayam – Karanganyar Nofrohu Retongga
ARembeN : Jurnal Pengabdian Multidisiplin Vol. 2 No. 1 (2024): ARemBeN Edisi Juni
Publisher : CV. Ro Bema

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69688/aremben.v2i1.69

Abstract

Tercatat oleh Badan Penanggulangan Bencana Daerah (BPBD) Kabupaten Kebumen dari tahun 2011 - 2020 terjadi 1335 kejadian bencana, 477 atau (35,7%) kejadian merupakan bencana longsor. Pengabdian ini terdiri dari tiga tahap, yaitu: Studi literatur digunakan sebagai acuan awal dalam pengabdian dan penguatan lereng yang akan digunakan di sepanjang jalan Karanggayam – Karanganyar. Pemetaan intensitas longsor di sepanjang Jalan Karanggayam – Karanganyar. Mencocokkan literatur yang ada untuk penguatan lereng berdasarkan fakta lapangan di sepanjang Jalan Karanggayam – Karanganyar. Rekomendasi penguatan lereng yang tepat berdasarkan fakta lapangan dan intensitas longsor di sepanjang Jalan Karanggayam – Karanganyar adalah pemasangan dinding penahan tanah, dan pembuatan terasering dengan sistem bronjong. Rekomendasi penguatan lereng ini sangat cocok dengan kondisi lereng yang curam dengan kelerengan 32° - 55°, tanah yang cukup tebal, dan tinggi lereng yang berkisar ± 4 meter – 10 meter di sepanjang Jalan Karanggayam – Karanganyar. Penguatan lereng sangat penting karena intensitas longsor yang cukup tinggi sehingga tidak lagi mengganggu lalu lintas serta meminimalisir korban jiwa akibat bencana longsor.
Analisis Perbandingan Tipe Fluida Berdasarkan Kandungan Anion Cl-SO4-HCO3 Pada Mataair Panas Candi Gedong Songo Dan Mataair Panas Derekan Kabupaten Semarang Provinsi Jawa Tengah Retongga, Nofrohu
Jurnal Ilmiah MTG Vol 14, No 1 (2023): Jurnal Ilmiah MTG Volume 14 No. 1 Tahun 2023
Publisher : Jurusan Teknik Geologi Fakultas Teknologi Mineral UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmtg.v14i1.8358

Abstract

Lokasi penelitian terletak di daerah mataair panas Candi Gedong Songo dan mataair panas derekan, Kabupaten Semarang, Provinsi Jawa Tengah. Tujuan penelitian untuk mengidentifikasi perbandingan tipe fluida berdasarkan kandungan anion Cl-SO4-HCO3 pada mataair panas Gedong Songo dan mataair panas Derekan, Kabupaten Semarang, Provinsi Jawa Tengah. Analisis tipe fluida mataair panas menggunakan data hasil pengujian geokimia. Berdasarkan hasil analisis geokimia dan perhitungan persentase kadar  unsur  Cl, SO4 dan HCO3, yang kemudian diplotkan dalam diagram Ternary Plot kandungan fluida mataair panas yang terdapat pada daerah Gedong Songo merupakan fluida air Sulfat, dikarenakan dari hasil analisis kimia diketahui unsur SO4 (Sulfat) merupakan unsur yang paling dominan dan berada pada Volcanic Waters. Berdasarkan hasil analisis geokimia dan perhitungan persentase kadar  unsur  Cl, SO4 dan HCO3 , yang kemudian diplotkan dalam diagram Ternary Plot kandungan fluida mataair panas yang terdapat pada daerah Derekan merupakan fluida air Bikarbonat. Hal ini dikarenakan dari hasil analisis geokimia diketahui unsur HCO3 (Bikarbonat) merupakan unsur yang paling dominan dan berada pada Peripheral Water.
Delineation of groundwater potential zone using remote sensing and GIS-based AHP for sustainable groundwater management in Aceh Besar Regency, Aceh Province, Indonesia Razi, Muhammad Haikal; Zahratunnisa, Zahratunnisa; Retongga, Nofrohu
Journal of Degraded and Mining Lands Management Vol. 11 No. 2 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.112.5237

Abstract

Sustainable groundwater management is crucial for ensuring the long-term availability of water resources and supporting socio-economic activities. As water demands increase and hydrological systems become more complex, accurately identifying groundwater potential zones is essential for effective resource planning and utilization. However, the in-situ data availability is often very limited, particularly on a regional scale. To solve this problem, this study aimed to delineate groundwater potential zones in Aceh Besar Regency using remote sensing and a GIS-based AHP (analytical hierarchy process). Several factors were used to determine groundwater potential zones, including lithology, land use/land cover, slope, lineament density, drainage density, rainfall, and soil type. Each factor was weighted based on an extensive literature review and knowledge-driven decision-making techniques. The results indicated that 26.35% of the area was classified as having low groundwater potential, whereas 53.86% was classified as moderate. Areas that have high to very high groundwater potential cover 16.76% to 3.04% of the Aceh Besar territory. The high groundwater potential zones were mostly located in alluvial and clastic sediments lithology, gentle slopes, and had high annual rainfall. Meanwhile, areas with igneous and metamorphic lithology as well as steep slopes, had moderate to low groundwater potential. Validation was carried out by collecting the high-yield existing production wells and calculating the area under the curve (AUC) of the receiver operating characteristic (ROC) curve with relatively good accuracy (74.5%). This research has effectively described the spatial distribution of groundwater potential, contributing to sustainable groundwater management and enabling informed decision-making for sustainable groundwater practices.
PERAN GEOMORFOLOGI DALAM ANALISIS RISIKO BENCANA LONGSOR DI DAERAH KARANGGAYAM, KABUPATEN KEBUMEN, PROVINSI JAWA TENGAH, INDONESIA Retongga, Nofrohu; Putri Wijaya, Nurhikmah; Anwar, Ardian; Akbar, Rizky; Ramadhan, Ilfan Prabu; Anjani, Dito Fatria; Darmawan, Wawan; M. Haris; Firdaus; Munandar, Agus; Kurniawan, Wawan
Hexagon Jurnal Teknik dan Sains Vol 5 No 2 (2024): HEXAGON - Edisi 10
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v5i2.3997

Abstract

The aim of this study was to determine the role of geomorphology in analyzing the risk of landslides disasters in a complete and comprehensive manner in the Karanggayam area, Kebumen Regency, Central Java Province, based on threat, vulnerability, resilience, and exposure factors. This research is descriptive in nature, so the data source relies on the results of field observations, which are then supported by data from laboratory analysis. The stages in this research were divided into data acquisition, data analysis, and studio stages. Studies of drainage patterns and geomorphological studies can be used as indicators to analyze the risk of landslides, such as landforms, soil thickness, slope, lithology, land use, and vegetation, as well as other indicators such as population density and rainfall, while indicators of resilience factors and exposure factors such as early warning systems, evacuation routes, health facilities, the economy, road borders, and river borders are part of social, economic, and public health. The risk of landslides in the Karanggayam area has three levels: low, medium, and high.
Model of Hydraulic Conductivity, Infiltration Rate, and Permeability at Gold Mine Waste Dump in North Sulawesi, Indonesia Agustin, Friska; Pratono, Landy; Andriansyah, Rian; Retongga, Nofrohu; Umar, Emi Prasetyawati
Journal of Earth and Marine Technology (JEMT) Vol 4, No 1 (2023)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2023.v4i1.4811

Abstract

The research area is a gold mine operating in North Sulawesi. The aim of the study was to analyze and calculate hydrological parameters, namely: hydraulic conductivity, infiltration rate, and permeability to find out how strong the soil cover is at one level of waste disposal. The method used is the Measurement of hydraulic conductivity, infiltration rate, and permeability in the field, analysis, and calculation of hydraulic conductivity, infiltration rate, and permeability based on field data. In the designated regions of the waste dump, specifically areas 1a, b, and c, we observed certain hydrological patterns that are worth noting. Firstly, the hydraulic conductivity in these areas, which is a crucial determinant of the rate at which water can move through the soil, consistently showcased low average values. This is further supported by the similarly slow infiltration rate identified in the same zones. The ability of the soil to transmit water, i.e., its permeability, also followed this trend, with values leaning towards the lower end of the scale, indicating very slow permeability. One major contributory factor to these patterns appears to be the soil's composition. Predominantly made up of sandy loam, the soil in these areas exhibits high water retention capabilities. Sandy loam, by its nature, binds and retains water effectively, which could potentially explain the observed hydrological behaviors in waste dump areas 1a, b, and c.
Relationship of Rock Geomechanics and Coal Mine Slope Safety Factor in South Sumatra Region, Indonesia Retongga, Nofrohu; Saputa, Rio Bagas; Agustin, Friska; Syaputra, Rizky; Razi, Muhammad Haikal; Zahidah, Atikah; Nainggolan, Efrat N
Journal of Earth and Marine Technology (JEMT) Vol 4, No 1 (2023)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2023.v4i1.4852

Abstract

The research location is in the coal mine area South Sumatera region, Indonesia. This study aims to determine the geomechanics relationship of the rock which includes the physical properties of the rock: bulk density, and mechanical properties of the rock (shear strength), cohesion and internal shear angle to the safety factor of the coal mine slopes in the study area. Field research is carried out by observing and measuring directly in the field in the following ways: (a) Measuring slope azimuth, slope, dip direction and slope height and width using a measuring tape and geological compass. (b) Rock description based on physical characteristics (megascopic) and rock sampling for testing the physical and mechanical properties of the rock in the laboratory. (c) Observing the general condition of water from rock slopes (dry, moist, watery, wet or flowing) and slope vegetation. 2. Cohesion values and internal shear angles are secondary data obtained from PT. X which has been analyzed in the laboratory. 3. Slope modeling was carried out using Rocscience Slide software. This shows that the smaller the rock density value, the greater the rock cohesion value. The greater the cohesion value of the rock, the smaller the value of the shear angle on the rock. The smaller the value of the shear angle in the rock, the greater the value of the safety factor of the rock slope.
Landslide Intensity and Potential Based on Geomorphology and Their Relationship to the Stadia Level of The Karanggayam River, Kebumen Regency, Central Java Province, Indonesia Nofrohu Retongga; Muhammad Haikal Razi; Sayidatina Hayatuzzahra; Aghib Dirgantara; Samsun Samsun; M Haris
Journal of Applied Geospatial Information Vol 8 No 1 (2024): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v8i1.7305

Abstract

Landslides are disasters, with a high incidence in the Kebumen Regency area. The Kebumen Regency Regional Disaster Management Agency (BPBD) recorded that from 2011 to 2020, there were 1,335 disaster events, 477 events (35.7%) were landslides, and most landslides occurred in Karanggayam District with a total of 43 disaster events, which is the number one landslide incident in Kebumen Regency. Landslides also occurred at several points along the Karanggayam River. The research method consists of three stages: a literature study, surface geological mapping, and field data processing. The strength and potential of landslides are connected to geomorphological conditions, which include morphology, morphogenesis, and morphoassociation. This is shown by field research results, geomorphological data analysis, and Karanggayam River stage data. The mature river stage level in the study area affects the strength and possibility of landslides caused by lateral erosion on the outer bend slopes of the river. These slopes are steep, have thick soil, less resistant rock types, and few to moderate plants.
REKOMENDASI REKLAMASI BERBASIS LINGKUNGAN DI LUBANG BUKAAN BEKAS PERTAMBANGAN RAKYAT DI PERKEBUNAN JAGUNG DEARAH KABUPATEN SUMBAWA Retongga, Nofrohu; Hayatuzzahra, Sayidatina; Safitra, Roby Mardiyan; Desiasni, Rita; Nuraga, Welly Handa
Hexagon Vol 6 No 1 (2025): HEXAGON - Edisi 11
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v6i1.5311

Abstract

The aim of this study is to create a descriptive model of environment-based reclamation recommendations for ex-mining land in the Sumbawa region that is easy to understand and consider. This research consisted of three stages: literature studies from previous researchers were used as a basic reference to strengthen the background and discussion in the research, especially with regard to environment-based reclamation engineering, mapping of open hole points from former community mining, and environment-based reclamation recommendation models. well and precisely in the corn plantation while still considering the initial shape of the topography. Effective reclamation to restore agricultural land damaged and with holes caused by mining without permits by providing recommendations in the form of a descriptive model includes backfilling of openings, planting trees, or revegetation, considering it for agrotourism, and economical fish-farming ponds.
The Relationship Between Morphology, Morphogenesis and Morphotectonics Potential for Flood Disasters in the Karanggayam Area, Kebumen Regency, Indonesia Retongga, Nofrohu; Razi, Muhammad Haikal
Journal of Applied Geospatial Information Vol. 8 No. 2 (2024): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v8i2.7710

Abstract

The Regional Disaster Management Agency (BPBD) of Kebumen Regency recorded that from 2011 to 2020 there were 1,335 disaster events, 154 (11.5%) of which were flood disasters. There were eight flood disasters in Karanggayam District were 8 incidents. This research method consists of four stages: literature study, field observation and mapping, analysis of morphology, morphogenesis, and morphotectonics, and analysis of the relationship between morphology, morphogenesis, morphotectonics, and flood potential. The potential for flood disasters is related to the morphological aspects, morphogenesis, and morphotectonics as controlling factors for flood disasters in the research area. Based on the potential for flood disasters in the research area, it is necessary to carry out non-structural mitigation in the research area. Appropriate nonstructural mitigation of flood disasters based on field facts, such as installing an early warning system for flood disasters, having evacuation routes and signs pointing to evacuation routes, socializing flood disasters, and installing warning boards in areas prone to flood disasters to minimize the risk of flood disasters in the Karanggayam area.
Co-Authors Abdurrahman Saputra Adella Ulyandana Jayatri Aghib Dirgantara Aghib Dirgantara Agus Munandar Agus Munandar, Agus Agustin, Friska Ahmad Husnul Fiqri Akbar, Rizky Alfal Gilang Ramadhan Andika Gerardus Oratmangun Andriansyah, Rian Andyono Broto Santoso Anjani, Dito Fatria Anwar, Ardian Aqmal Septian Hakim Ardian Anwar Arie Noor Rakhman Atikah Zahidah Atikah Zahidah Bayu Syakiran Budiman Budiman Dandy Firdiansyah Diana Septiani Roos Dwi Indah Purnamawati, Dwi Indah Efrat N Nainggolan Emi Prasetyawati Umar Firdaus Frida Rosidatul Mu’awanah Friska Agustin Friska Agustin Hayatuzzahra, Sayidatina Indah Aprianti Jayatri, Adella Ulyandana L. Muh. Fathur Rizki Landy Pratono Lia Alfianita M Haris M. Haris M. Haris Marolop P Pangaribuan Muhammad Haikal Razi Muhammad Haikal Razi Muhammad Jihad Muhammad Rivai Nainggolan, Efrat N Nur Widi Astanto Agus Tri Heri Nuraga, Welly Handa Nurhikmah Putri Wijaya Oan Marcello Lukas Watania Popi Jolia Salia Prasetyawati Umar, Emi Pratono, Landy Putri Wijaya, Nurhikmah Ramadhan, Ilfan Prabu Razi, Muhammad Haikal Rian Andriansyah Rio Bagas Saputa Rita Desiasni Rizaldi Rizaldi Rizky Syaputra Rohmad Bagus Abadi Safitra, Roby Mardiyan Samsun Samsun Saputa, Rio Bagas Sayidatina Hayatuzzahra Syaputra, Rizky Veri Irshapratama Wawan Darmawan Winnugroho Wiratman, Manfaluthy Hakim, Tiara Aninditha, Aru W. Sudoyo, Joedo Prihartono Zahidah, Atikah Zahratunnisa, Zahratunnisa