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All Journal Jurnal Fisika Unand Teknika: Jurnal Sains dan Teknologi Jurnal Sains dan Teknologi: Jurnal Keilmuan dan Aplikasi Teknologi Industri Jurnal Ipteks Terapan Jurnal Hilirisasi IPTEKS (JHI) Jurnal Ilmu Fisika Jurnal Fisika Indonesia BERNAS: Jurnal Pengabdian Kepada Masyarakat Indonesian Journal of Community Empowerment and Service Jurnal Keilmuan dan Aplikasi Teknologi Industri
Ahmad Fauzi Pohan
Departemen Fisika, FMIPA, Universitas Andalas
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Identifikasi Segmen Talamau Menggunakan Kombinasi Data Satelit GGMPlus dan Koreksi SRTM2gravity Berdasarkan Analisis Second Vertical Derivative (SVD) Khairunnisa, Widya Indah; Pohan, Ahmad Fauzi
Jurnal Fisika Unand Vol 14 No 2 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.2.198-204.2025

Abstract

The existence of the Talamau segment was only identified by the BMKG after the earthquake that occurred on Friday morning 25 February 2022 in Talamau District, West Pasaman Regency. This earthquake had a magnitude of 6.1 Mw with 201 aftershocks. This research aims to determine the characteristics of the fault types of the Talamau segment using the gravity method. The gravity method can describe subsurface geological structures based on differences in rock density known as gravity anomalies. Gravity data is taken from satellite gravity data in the form of GGMplus data and SRTM2gravity topography data. The resulting gravity anomaly value can be used to determine the characteristics of the fault type using Second Vertical Derivative (SVD) analysis. The combination of GGMplus and SRTM2gravity data provides results that can describe the existence of the Talamau segment based on differences in rock density contrast. The existence of the Talamau segment is in a moderate anomalous pattern with the constituent components namely alluvium rock, gravel sand, silt, Talamau mountain rock, inseparable volcanic rock, intrusive rock, and Kuantan formation rock. From the SVD analysis, the characteristics of the fault type of the Talamau segment are also obtained, namely strike-slip faults.  
Implementasi Seismik Refraksi Metode Hagiwara untuk Pendeteksian Bidang Gelincir di Sempadan Sungai Daerah Perumahan Sungai Bangek Humaira Aryanti Khaidir; Ahmad Fauzi Pohan
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.554-560.2025

Abstract

The rapid development in the riparian zone of the Bangek River, Koto Tangah District, Padang City, has the potential to increase the risk of geological hazards such as landslides. This study aims to identify the subsurface structure and the presence of slip surfaces in the riverbank area that is being developed into a residential zone, using the Hagiwara method. Data acquisition was carried out along two survey lines, oriented perpendicular and parallel to the river, with offsets of 40 m and 30 m, respectively, employing four geophones and a 10 kg hammer as the seismic source. The interpretation results from the first survey line indicate that the subsurface consists of unsaturated sand and weathered layers, with evidence of a slip surface at a distance of 0–18 m and depths ranging from 0.7–4 m. This slip surface is located within a permeable layer with a low seismic velocity (368.955 m/s), overlain by an impermeable layer with a higher velocity (642.508 m/s). Meanwhile, the second survey line reveals a relatively homogeneous structure composed of weathered layers with varying densities. The Hagiwara interpretation identifies a slip surface along the second refractor, indicating potential slope instability within the first layer characterized by a low seismic velocity (449.165 m/s), suggesting weaker rock compaction. The information regarding the presence and depth of the slip surfaces identified in this study provides an important reference for development planning to mitigate the potential risk of landslides in the Bangek River riparian zone.
PENERAPAN KONSEP HUKUM BERNOULLI UNTUK MENGATASI KRISIS AIR PADA KELOMPOK TANI PADI JORONG BATU GADANG DI KENAGARIAN KATIALO KABUPATEN SOLOK, SUMATERA BARAT Marzuki Marzuki; Ahmad Fauzi Pohan; Afdal Afdal; Trengginas Eka Putra Sutantyo
Jurnal Hilirisasi IPTEKS Vol. 4 No. 1 (2021)
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jhi.v4i1.486

Abstract

This activity aims to apply Bernoulli's law to the piping system in the hydrant pump to meet the needs of residents in bathing, washing, and irrigating the fields. The activity begins with conducting a site review survey, counseling and determining the location of pump placement, making pumps and towers, and lifting pumps and towers to the location. Then the activities at the location are divided into several parts, including the manufacture of civil and mechanical pump systems and testing the success of the pump system. This activity carried out the manufacture of hydrant pumps by installing pipes using Bernoulli's law to meet the needs of the residents of Jorong Batu Gadang, totaling 30 families and irrigating rice fields covering an area of 78 ha, which are rainfed rice fields. The results of the activities carried out at Nagari Katialo, Jorong Batu Gadang in applying the concept of Bernoulli's Law to the piping system at the hydrant pump made water faster to reach the highest point of the piping system that had been made. As for the difference in height between the position of the pump and the water level in the reservoir (tank) of 30 meters, the flow of water rising to the tank is 2 liters/second. The people of Jorong Katialo can already enjoy the water stored in the reservoir. The success of this pump system is shown from less than 10 minutes of testing the water successfully to the water reservoir above the tower with a height difference of 30 meters from the placement of the hydrant pump.
SOSIALISASI DAN PEMETAAN POTENSI TANAH LONGSOR MENGGUNAKAN METODE MIKROSEISMIK DAN GEOLISTRIK DI KAWASAN OBJEK WISATA BUKIT NOBITA Marzuki Marzuki; Mutya Vonnisa; Ahmad Fauzi Pohan; Arif Budiman; Imam Taufiq; Trengginas Eka Putra Sutantyo; Elistia Liza Namigo; Dian Milvita; Alimin Mahyudin; Nini Firmawati; Muldarisnur Muldarisnur; Afdal Afdal; Dahyunir Dahlan; M. Ali Shafii; Afdhal Muttaqin; Rico Adrial; Dedi Mardiansyah; Harmadi Harmadi; Zulfi Zulfi; Geby Sri Ayu Oktavia; Fani Anjelina; Nurul Annisa
Jurnal Hilirisasi IPTEKS Vol. 6 No. 2 (2023)
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jhi.v6i2.655

Abstract

Nobita Hill is one of the areas being developed as a tourist attraction in the city of Padang. Above Nobita Hill is a beautiful view, and you can see the picture of Padang City. However, the hilly topography with steep slopes makes this area prone to landslides. This activity aims to map the potential for landslides on Novita Hill. Activities start from preparation, implementation in the field, and evaluation. Field activities are carried out in two stages. The first stage is an experiment to map the landslide potential. The second stage is socialization. The target audience for this activity is the Village Head of Jua Nan XX Village and its officials and the community around Nobita Hill. The results of the study and mapping were disseminated to the village administration and community leaders involved in the development of the Bukit Nobita tourism area, which was carried out on November 16, 2022. The result of tourist objects often changes land use and cover. However, mitigation of the potential for landslides in this area has never been done. Therefore, the Andalas University Physics Department team mapped the potential for landslides on Novita Hill for six months, using microseismic and geoelectric methods. This activity obtained a map of the distribution of dominant frequencies, a map of the distribution of amplification, and an identification of slip planes concerning the potential for landslides on Nobita Hill. Furthermore, the results of the mapping and mitigation efforts have been disseminated to the village administration and community leaders involved in the development of the Bukit Nobita tourism area. This activity was carried out well. The landslide potential distribution map obtained from this activity is input for the community and stakeholders in developing the Buki Nobita tourist attraction that is safe from disasters.
PEMBANGUNAN KINCIR AIR UNTUK PEMBANGKIT LISTRIK DAN PENGGILINGAN TEPUNG BAGI MASYARAKAT DI KAMPUNG NGALAU RANDAH KABUPATEN SOLOK SELATAN, SUMATERA BARAT Asep Neris Bachtiar; Ahmad Fauzi Pohan
Jurnal Hilirisasi IPTEKS Vol. 7 No. 2 (2024)
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jhi.v7i2.736

Abstract

The need for energy, especially electricity, is fundamental and essential in daily life. This is particularly true for communities in rural areas that rely on fossil fuel-powered machines for their work, such as milling rice into flour. One such community is the farming group in Kampong Ngalau Randah, Solok Selatan, West Sumatra. This activity aims to realize the construction of a small-scale renewable energy technology building, specifically a pico-hydro power plant using a steel waterwheel that functions as both a power generator and a production machine/flour mill driver. The target partners for this activity are the residents of Kampung Ngalau Randah, Jorong Manggih, which is an isolated village in Kenagarian Pakan Rabaa Timur, Solok Selatan Regency, West Sumatra. The methods of this activity include surveys and experiments, starting with a potential survey at the partner's location followed by outreach, fabrication of the waterwheel components and assembly in the city of Padang, dismantling the old waterwheel at the partner's location, and transporting the new waterwheel unit to the partner's location, which is 180 km away. The outcome of this activity has successfully resulted in the construction and donation of a waterwheel unit for the local community. In the future, it is hoped that the development of this waterwheel-driven power plant in Kampung Ngalau Randah will serve as a pilot project that can inspire other village communities to build power plants in their respective areas.
Perencanaan Turbin Air sebagai Penggerak Mula Sistem Pembangkit Tenaga Piko-hidro Model Drum Asep Neris Bachtiar; Irwan Yusti; Ahmad Fauzi Pohan
Jurnal Sains dan Teknologi: Jurnal Keilmuan dan Aplikasi Teknologi Industri Vol. 24 No. 1 (2024): Regular Issue
Publisher : SEKOLAH TINGGI TEKNOLOGI INDUSTRI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36275/m27r7e32

Abstract

Penelitian survey ini akan menganalisis jenis penggerak mula apa yang tepat untuk diterapkan pada sistem pembangkit tenaga piko-hidro model drum. Jenis penggerak mula yang banyak digunakan pada sistem pembangkit skala kecil antara lain kincir air, turbin Kaplan, turbin Francis, turbin Cross-flow, dan turbin Pelton. Masing-masing turbin memiliki kriteria tertentu sesuai dengan potensi head, debit air, daya bangkit, dan sistem pembangkit yang direncanakan. Dengan demikian perencanaan pemilihan penggerak mula harus mempertimbangkan banyak aspek dan pembahasannya melibatkan banyak formula yang tepat. Dari empat kriteria pengklasifikasian turbin air didapat informasi bahwa ada dua tipe turbin yag cocok untuk diterapkan pada sistem pembangkit tenaga piko-hidro model drum yaitu turbin Francis dan turbin Cross-flow. Di antara kedua turbin tersebut, turbin Cross-flow lebih tepat untuk diterapkan pada sistem pembangkit tenaga piko-hidro model drum mengingat kemudahan dalam proses fabrikasinya. Turbin Cross-flow dpat dibuat di bengkel-bengkel kecil yang ada di masyarakat sementara turbin Francis hanya dapat dibuat oleh bengkel tertentu yang memiliki dapur pengecoran logam. Spesifikasi turbin Cross-flow hasil analisis ini adalah sebagai berikut, jenis turbin : turbin Cross-flow, daya bangkit turbin : 0,4 kW, putaran turbin : 810 rpm, kecepatan spesifik turbin : 163, head turbin : 2,5 m, debit air masuk turbin : 20 liter/s, dan diameter runner turbin : 80 mm.
Co-Authors Adrial, Rico Afdal Afdal Afdal Afdal Afdal, Afdal Afdhal Muttaqin Afdhal Muttaqin Afikatul Awaliyah Afikatul Awaliyah Aina’ul Mardiyah Alimin Mahyudin Ardian Putra Arif Budiman Ariqah Ardelia Asep Neris Bachtiar Astuti Astuti Dahyunir Dahlan Damayanti, Elok Dedi Mardiansyah Desti Wury Andany Dian Fitriyani Dian Milvita Dwi Pujiastuti Dwi Puryanti Elistia Liza Namigo, Elistia Fani Anjelina Fani Anjelina Fani Anjelina Feriska Handayani Irka, Feriska Handayani Geby Sri Ayu Oktavia Geby Sri Ayu Oktavia Harmadi Harmadi Humaira Aryanti Khaidir Ikhwan Safrima Illona giovanni, Vannessa Imam Taufiq Imam Taufiq Imam Taufiq Iqwal Ramadhan Irwan Yusti Khairunnisa, Widya Indah Lathifah Fauziah M. Ali Shafii M. Ali Shafii M. Arif Marzuki Marzuki Marzuki Marzuki Meqorry Yusfi Mhd. Kahfi Muhammad Khaikal Marbun Muldarisnur, Mulda Mutya Vonnisa Nadila Syarah Nadilla Syarah Nini Firmawati Nurul Annisa Nurul Annisa Nurul Annisa Nurul Annisa Oktavia, Geby Sri Ayu Puja Kasmailen Putri Ramacos Fardela Refky Adi Nata Ronal Floren Rusnoviandi, Rusnoviandi Sri Handani Sri Oktamuliani Suryanto, Wiwit Syafira Aulina Refiani Trengginas Eka Putra Sutantyo Usna, Sri Rahayu Alfitri Wahyudi Wahyudi Wildian Wildian Windi Jalnadia Zulfi Zulfi Zulfi Zulfi Zulfi Zulfi Zulfi