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All Journal Indonesian Journal of Geography Komunikasi Fisika Indonesia Sinergi Journal of Applied Geospatial Information JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY MAJALAH ILMIAH GLOBE Jurnal Geografi, Edukasi dan Lingkungan Media Mahardhika Jurnal Kreativitas PKM International Journal of Remote Sensing and Earth Sciences (IJReSES) Indonesian Physical Review DIFFRACTION: Journal for Physics Education and Applied Physics Jurnal Teras Fisika : Teori, Modeling, dan Aplikasi Fisika Jurnal Penelitian Fisika dan Terapannya (JUPITER) Journal of Computer Science and Engineering (JCSE) Jurnal Ilmiah Matematika Mitra Akademia: Jurnal Pengabdian Masyarakat Indexia Jurnal Energi Baru dan Terbarukan Jurnal Aplikasi Bisnis Kesatuan GEOGRAPHIA: Jurnal Pendidikan dan Penelitian Geografi Jurnal Kolaboratif Sains Jurnal Riset Statistika Newton-Maxwell Journal of Physics Jagratara: Journal of Disaster Research The International Journal of Remote Sensing and Earth Sciences (IJReSES)
Yahya Darmawan
Indonesian Agency For Meteorological, Climatological And Geophys-ics (BMKG) Region I
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Study of Wind Energy Potential for Wind Power Plants Development in the South Coastal Area of Malang Regency Yahya Darmawan
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 9 No. 2 (2025): December 2025 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v9i2.15344

Abstract

One of the renewable energy sources that has the potential to be developed in Indonesia is wind energy sources, Indonesia has wind energy sources that can be converted to produce up to 60.68 GW of electricity. One of the potential areas to be developed is the southern region of Java Island and wind speed analysis using the wind weilbull approach. wind speed data is taken from Nasa Power satellite data with a wind height of 50 meters with a time span of January 1, 2022 to December 31, 2022. From the calculation of wind speed, it is found that in the coastal area of South Malang the average speed is 4.92 m/s, with the highest speed of 11.18 m/s. From the analysis using the wind weilbull approach, it is found that the South Coast of Malang has a variation in wind speed between 1-12 m / s where the highest speed occurs in the wind speed range of 6 m / s occurs as much as 18.976%, and the occurrence in 1 year occurs for 1547 hours and the electrical energy produced in a year is 413,520,696 watts. By using q-blade simulation with a turbine diameter of 7.8 m, NACA 4412 airfoil type and TSR value of 5.5, the wind turbine capacity is 5.93661 kW with a CP value of 0.4392. Key words: Renewable energy, maximum average wind speed, electrical energy, wind turbine
Edukasi Partisipatif Peringatan Dini dan Mitigasi Bencana Hidrometeorologi di Kecamatan Pesanggrahan Darmawan, Yahya; Karyono, Karyono; Wandono, Wandono; Benyamin Heryanto Rusanto; Agung Perdian Sulistio
Mitra Akademia: Jurnal Pengabdian Masyarakat Vol 8 No 3 (2025): Mitra Akademia: Jurnal Pengabdian Masyarakat
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Jakarta

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Abstract

Indonesia, as an archipelagic country with a high risk of geo-hydrometeorological disasters, requires early education to build awareness and preparedness. This study aims to improve students’ understanding of early warning systems and disaster mitigation through participatory learning. The Community Service Program (PKM) was carried out at SMA Triguna 1956, Pesanggrahan District, South Jakarta, on July 24, 2025. The stages included site survey, material preparation, socialization through Focus Group Discussion (FGD), disaster response simulation, and evaluation using pre-test and post-test combined with digital media. A quasi-experimental method with a pre-test and post-test design was applied. The results showed a significant increase in students’ understanding of early warning procedures and mitigation measures. Thus, participatory education proved effective in strengthening youth preparedness against geo-hydro meteorological disasters.
COMPARISON OF THE VEGETATION INDICES TO DETECT THE TROPICAL RAIN FOREST CHANGES USING BREAKS FOR ADDITIVE SEASONAL AND TREND (BFAST) MODEL Yahya Darmawan; Parwati Sofan
International Journal of Remote Sensing and Earth Sciences Vol. 9 No. 1 (2012)
Publisher : BRIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.ijreses.2012.v9.a1823

Abstract

Remotely sensed vegetation indices (VI) such as the Normalized Difference Vegetation Index (NDVI) are increasingly used as a proxy indicator of the state and condition of the land cover/vegetation, including forest. However, the Enhanced Vegetation Index (EVI) on the outcome of forest change detection has not been widely investigated. We compared the influence of using EVI and NDVI on the number and time of detected changes by applying Breaks for Additive Seasonal and Trend (BFAST), a change detection algorithm. We used MODIS 16-day NDVI and EVI composite images (April 2000-April 2012) of three pixels (pixels 352, 378, and 380) in the tropical peat swamp forest area around the flux tower of Palangka Raya, Central Kalimantan. The results of BFAST method were compared to the Normalized Difference Fraction Index (NDFI) maps and the maps were validated by the hotspot of the Infrastructure and Operational MODIS-Based Near Real-Time Fire(INDOFIRE). Overall, the number and time of changes detected in the three pixels differed with both time series data because of the data quality due to the cloud cover. Nonetheless, we found that EVI is more sensitive than NDVI for detecting abrupt changes such as the forest fires of August 2009-October 2009 that occurred in our study area and it was verified by the NDFI and the hotspot data. Our results demonstrated that the EVI for forest monitoring in the tropical peat swamp forest area which is covered by intense cloud cover is better than that NDVI. Nonetheless, further research with improving spatial resolution of satellite images for application of NDFI is highly recommended.
Respon Meteorologi dan Oseanografi Perairan Indo-Pasifik terhadap Kejadian Multi Siklon Tropis pada November–Desember 2021 Sabrina, Purwanti Lelly; Ramadani, Rizki; Darmawan, Yahya
DIFFRACTION: Journal for Physics Education and Applied Physics Vol 7, No 2 (2025)
Publisher : Pendidikan Fisika, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Siliwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37058/diffraction.v7i2.17887

Abstract

Indonesia tidak mengalami kondisi siklon tropis secara langsung, namun sering terdampak oleh siklon tropis yang terjadi di Samudera Hindia dan Samudera Pasifik. Hal ini mempengaruhi kondisi atmosfer dan oseanografi seperti angin, curah hujan, gelombang, dan suhu permukaan laut. Penelitian ini bertujuan untuk menganalisis karakteristik kondisi meteorologi dan oseanografi pada fase bibit dan siklon tropis yang terjadi pada periode November – Desember 2021 serta kaitannya dengan variabilitas iklim regional dan global. Terdapat 4 kejadian yaitu siklon tropis Paddy, Nyatoh, bibit siklon 94 W dan 95 S. Hasil menunjukkan bahwa kecepatan angin selama kejadian siklon tropis berkisar antara 15 – 29 m/s dengan tinggi gelombang 2,5 – 5 m. Siklon tropis mempengaruhi peningkatan curah hujan beberapa waktu setelah kejadian, dengan curah hujan maksimum mencapai 106 mm/hari pada Siklon Tropis Nyatoh. Indeks ENSO 3.4 menunjukkan kondisi La Niña kuat pada periode penelitian, sementara indeks IOD berada pada fase netral. Suhu permukaan laut di Samudera Pasifik dan perairan Indonesia berkisar 24 – 32 °C, sedangkan di Samudera Hindia 24 – 30 °C. Hasil penelitian ini diharapkan dapat menjadi dasar dalam peningkatan pemahaman dampak siklon tropis terhadap laut – atmosfer Indonesia, serta mendukung upaya mitigasi dan peringatan dini bencana hidrometeorologi.
Pengaruh Dinamika Atmosfer Terhadap Kejadian Banjir di Kabupaten Aceh Selatan (Studi Kasus 24 Oktober 2023) Manullang, Safri Emanuel; Yahya Darmawan; Widodo, Widodo; Nuzula Elfa Rahma; Rizky Franchitika
Jurnal Geografi, Edukasi dan Lingkungan (JGEL) Vol. 10 No. 1 (2026): Edisi Bulan Januari
Publisher : Pendidikan Geografi Universitas Muhammadiyah Prof. Dr. Hamka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22236/jgel.v10i1.18139

Abstract

Telah terjadi Banjir di Kabupaten Aceh Selatan yang didahului adanya hujan ekstrim selama tiga hari berturut-turut sejak tanggal 22–24 Oktober 2023. Tujuan penelitian ini adalah menganalisis kondisi atmosfer yang menyebabkan hujan lebat tersebut. Data yang digunakan pada penelitian ini adalah data suhu permukaan laut, data kelembapan spesifik, angin komponen u dan v, kecepatan vertikal pada lapisan 500 hPa, 700 hPa, 850 hPa, dan 925 hPa, data satelit Himawari-9 band 3, 5, 7, 8, 10, 13, dan 15. Teknik analisis deskriptif dengan pendekatan spasial dilakukan setelah pengolahan data yang mencakup parameter suhu permukaan laut, streamline, angin orografis, kecepatan vertikal, divergensi, dan Low Level Moisture Transport (LLMT). Pemantauan  sebaran awan dilakukan berdasarkan data Himawari dengan metode Red Green Blue (RGB) Day Convective Storms dan 24 Hour Microphysics, serta Cloud Convective Overlay (CCO). Hasil penelitian menunjukkan suhu permukaan laut meningkat antara 28,5°C hingga 30°C yang menambah suplai uap air, streamline menunjukkan arah angin timuran pada lapisan bawah. Angin orografis, kecepatan vertikal, dan konvergensi menunjukkan terjadinya updraft dan daerah konvergen karena Pegunungan Leuser. Indeks Stabilitas atmosfer dengan nilai K Indeks 36°C, LI Indeks -2,8°C, TT Indeks 44,3°C, SSI -0,5°C, SWEAT 327, CAPE 740 J/kg, CIN 43 J/kg, dan suhu puncak awan -66°C menginterpretasikan terjadinya aktivitas konvektif yang mengakibatkan presipitasi. Penelitian dapat digunakan pemahaman terhadap dinamika atmosfer dan dasar dalam mendukung sistem peringatan dini untuk mitigasi banjir akibat hujan ekstrem terutama wilayah yang memiliki letak geografi yang berada diantara laut dan pegunungan.
Co-Authors Afriyanti Agung Perdian Sulistio Akbar, Ahmad Aldizar Al Badri, Abdul Aziz Amanu, Rendy Syahril Amri, Sayful Anggraini, Eca Indah Aplena Elen S. Bless Ardhana, Andini Aprilia Arief Wibowo Arief, Syachrul Arifianto, Fendy Arkananta, Muhammad Zaky Armadyaputri, Aludra Nadia Bambang Giyanto Benyamin Heryanto Rusanto Carundyatama, Daniar Ihza Dahsan, Sudarti Deni Septiadi Dhaifullah Rafif Aslam Erna Frida Fadhli Aslama Afghani Fadllillah, Ahmad Arif Zulfan Ferdiansyah, Ervan Ferdiyansyah, Ervan Franchitika, Rizky Giananti, Attiya Shakila Habibi, Naufal Ilham Hayatul Khairul Rahmat Hibatullah, Khindi Aufa Ikhsanudin, Agus Haryanto Imawan Mashuri Karyono Karyono Kusumayanti, Diah Lumbantoruan, Alva Josia Manik, Willy Bonanja Manullang, Safri Emanuel Manurung, Ellya Veronika Iriani Manurung, Royston Marhaposan Situmorang, Marhaposan Muhamad Arif Jumansa Muhammad Labieb Muzakkie Muhammad Zaky Arkananta Mulya, Aditya Munawar Munawar Nardi, Nardi Nisa, Ania Maulidiah Nurdin, Fachdy Nuzula Elfa Rahma Oktabrian, Krisna Dwi Parwati Sofan Rahma, Nuzula Elfa Ramadoni Khirtin Restianto, Mohammad Obie Rista Hernandi Virgianto Rizki Ramadani Sabrina, Purwanti Lelly Samen Baan Sanjaya, Kadek Valerina Kitana Saputra, Ahmad Irsyad Saragih, Immanuel Jhonson A. Sudarisman, Maman Supriyadi, Asep Adang Syahrul Humaidi, Syahrul Tambunan, Nensy Nindy Tanggahma, Yuan Zalfa Trianasari, Maria Evy Tulus Ikhsan Nasution Veanti, Desak Putu Okta Vidia, Trimawarti Esti Wandono, Wandono Weman Suardy Wibowo, Shindyko Widodo , Anton Widodo Widodo