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All Journal BERKALA FISIKA SAINS DAN MATEMATIKA YOUNGSTER PHYSICS JOURNAL Eksergi: Chemical Engineering Journal Syntax Literate: Jurnal Ilmiah Indonesia Journal of Physics and Its Applications Jurnal Energi Baru dan Terbarukan Eksergi: Jurnal Teknik Energi Asian Journal of Social and Humanities

Udi Harmoko

Departemen Fisika, Fakultas Sains Dan Matematika, Universitas Diponegoro, Semarang

Author-ID : 3136311

Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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INTERPRETASI BAWAH PERMUKAAN SISTEM PANAS BUMI DIWAK DAN DEREKAN BERDASARKAN DATA GRAVITASI Syamsul Ilmi; Udi Harmoko; Sugeng Widada
Youngster Physics Journal Vol 3, No 2 (2014): Youngster Physics Journal April 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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ABSTRACTResearch has been carried out using a gravity method that aims to interpret the subsurface structure of the Diwak - Derekan hot springs area based on the Bouguer anomaly data. It also aims to investigate the geothermal system in the area. The data aquisition was taken using gravitymeter Lacoste & Romberg.Data processing had been done with high correction tool, tidal correction, drift correction, gravity absolute correction, gravity theoretical correction, free air correction, Bouguer correction, terrain correction to get the complete Bouguer anomaly. Bouguer anomolay is projected to flat plane and upward continuation is used to separate the regional and residual anomaly. For 2D modelling interpretation by Grav2DC software.The results of study showed the complete Bouguer anomaly contour pair of positive and negative contour indicate a fault zone below the surface. Interpretation is strengthened by the results of the modeling showed a fault of Diwak - Derekan areas trending southwest- northeast. This fault zone is used as a media outlet fluid to the surface of geothermal systems.Keywords: Gravity Method, 2D modelling, Diwak, Derekan

INTERPRETASI BAWAH PERMUKAAN DAERAH SUMBER AIR PANAS DIWAK-DEREKAN BERDASARKAN DATA MAGNETIK Muhammad Ulin Nuha ABA; Tony Yulianto; Udi Harmoko
Youngster Physics Journal Vol 3, No 2 (2014): Youngster Physics Journal April 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Research has been carried out using a magnetic method that aims to interpret the subsurface structure of the area hot springs Derekan - Diwak based on the total magnetic field anomaly data. It also aims to investigate the geothermal system in the area.Some 99 points measurement areas were measured using PPM (Proton Precession Magnetometer) geometrics type GSM19T models to get the value of the total magnetic field and two points as a base station simultaneously measured using the PPM G856X models. Measurement data is processed by the daily variation correction and IGRF (International Geomagnetic Reference Field) correction. The data has been used to create a contour corrected total magnetic field anomalies and subsurface cross sections involving the upward continuation and reduction to the poles.The results of study showed the total magnetic field anomaly closure pair of positive and negative closure indicate a fault zone below the surface. Interpretation is strengthened by the results of the modeling showed two faults of Derekan - Diwak areas trending southwest- northeast. This fault zone is a media outlet fluid to the surface in the area of geothermal systems.Keywords: geothermal, fault, and total magnetic field

INTERPRETASI STRUKTUR BAWAH PERMUKAAN DI MUARA SUNGAI PROGO MENGGUNAKAN METODE MAGNETIK Dewi Andri; Muhammad Irham; Udi Harmoko
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Progo fault is one of the active faults located in the south of Yogyakarta. Progo fault is suspected that located in Progo River estuary area, Banaran, DIY. However, studies are still needed to support the scientific basis of the position and the type of fault in Progo River estuary. Magnetic survey has been carried out in DIY Progo River estuary to determine the subsurface structure in the area. Data needed in the processing of magnetic data is a magnetic anomaly data obtained from the values of the total magnetic field strenghthas been corrected. In this study, magnetic data acquisition was carried out in 97 points by using a PPM (Proton Precession Magnetometer) geometrics 856X. Data Processing began with International Geomagnetic Reference Field (IGRF) correction and diurnal correction to get the total magnetic anomaly. The total magnetic anomaly contour created by using Surfer that has been used to process upward continuation and then made reduction to the poles. The result of research showed the total magnetic anomaly closure pair of positive and negative indicated a fault zone below the surface. Mag2D used to create 2D modelling to obtain the subsurface structure and susceptibility values. To reinforce the results of subsurface structure, 3- modelling has been created by used Mag3D. In 2D-modelling of subsurface structure is obtained in the form of fault zones in the west an the east of the River Progo. The interpretation is reinforced by the result of 3D-modelling in the area. There are tworeserve faults in Progo River estuary area, first in the west of the Progo River and second in east Progo River to a depth of 1000 meters.

PEMODELAN STEADY STATE SISTEM PANAS BUMI DAERAH SUMBER AIR PANAS DIWAK-DERAKAN DENGAN MENGGUNAKAN SOFTWARE HYDROTHREM 2.2 Aditya Firdaus; Udi Harmoko; Sugeng Widada
Youngster Physics Journal Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Steady State Modeling has been done hot springs Diwak-Derekan using Hydrotherm 2.2 software which aims to model numerically geothermal system Diwak-Derekan in Steady State conditions. The results form the output of Hydrothrem 2.2 Temperature Distribution and visualization of the data carried Temperature Distribution.Extent of the study area is 16 km x 16 km, where there is a buffer area in the outer portion of the study area. then made construction research area consisting of several slice and block research. Used topographic data using secondary data, and topographic data modeling made in accordance with the slice. Each slice of the construction area made initial research model that contains the physical parameters. Due to the limitations of the data parameters of physics, then some physical parameters of the data analogous to data from Mount Merapi and soil mechanics research data Diponegoro University Dam, physical parameters and the data is made in the form of program listings in the form of input for software Hydrothrem which Hydrotherm Software run the program until the year to 200,000 by year interval 10,000 years.The results of data visualization is seen that the temperature distribution for the data in the year to 80,000 and so no change is significant, this indicates that in the year to 80,000 already reached Steady State conditions. Khono (2000) said, geothermal system reach steady state condition between 200.000-500.000 years, its because using analogical data from Merapi Vulcano and ground mechanic Diponegoro University dam. Manifestations of geothermal systems around the emergence of hot water Diwak-Derekan a geothermal system associated with sediments. This is confirmed by studies based on the gravity method which is done around the study area, where there are faults trending down southwest - northeast parallel to Kali and Kali Jumbleng Klampok, where after a qualitative interpretation there are 4 layers of rock, where the top layer is sediment layer has a depth of about 3 km.Keywords: geothermal, fault, Distributions Temperature, geothermal systems, Steady State.

REDUKSI LONG PERIOD MULTIPLE DENGAN MENGGUNAKAN METODE HIGH-RESOLUTION RADON DEMULTIPLE (RAMUR) PADA DATA SEISMIK DARAT 2D Faradina A. P.; Udi Harmoko; Fazrin Oktafian
Youngster Physics Journal Vol 4, No 4 (2015): Youngster Physics Journal Oktober 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Multiples often occur in marine seismic data, but actually, they also occur in the far offset section of land seismic in that multiple reduction in land seismic data using CDP gather resulted from conventional method can be applied to acquire omitted multiple model. There are many methods to reduce the appearance of long period multiples, yet to remove multiples from primary signals is challenging. Compared to other methods, high-resolution Radon demultiple (RAMUR) is a method which uses Radon transform to predict multiples using domain tau-p to model multiples. RAMUR processing has more advantages in identifying reflection events, both in primary signals and multiples, to produce good stack sections. In this research, CDP gather resulted from conventional method was used as input in multiple modeling. Besides, adaptive subtraction process also apply CDP gather as input data to be subtracted with multiple model to preserve the data. The result shows that high-resolution Radon demultiple (RAMUR) method is able to reduce long period multiples in far offset section using DTCUT 120 parameter in land seismic effectively.

Analisis resiko kebencanaan gempa bumi data mikrotremor di Desa Fulolo Kecamatan Alasa Kabupaten Nias Utara Asronj Bakkit Simanjuntak; Gatot Yuliyanto; Udi Harmoko
Youngster Physics Journal Vol 6, No 4 (2017): Youngster Physics Journal Oktober 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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The Measurement of the microtremor has been conducted in the Village of Fulolo, Alasa Subdistrict, North Nias District. The aim of this study is to determine the parameters of HVSR in the form of the dominant frequency value (f0) and amplification factor (A0) and the parameters of soft sediment thickness (H), seismik vulnerability index (Kg), peak ground acceleration/PGA (α) and ground shear strain (γ) as well as analyzing the earth quake disaster risk in the Village of Fulolo, Alasa District, North Nias District. Microtremor measurements done on 5 points measurement and microtremor’s data were analyzed using Horizontal to Vertical Spectral Ratio’s method. The HVSR analysis is in the dominant frequency (f0) value and amplification (A0) value. Then calculate the thickness of soft sedimentary , the value of peak ground acceleration/PGA(α), the value of seismic vulnerability index (Kg) and the value of ground shear strain (γ).The results showed that the village of Fulolo have dominant frequency (f0) distribution grade range up 0,954 Hz to 7,149 Hz, the value of amplification (A0) ranges up 0,546 to 7,505, the value of the thickness of soft sedimentary (H) ranges up 8,945 meters t 112,21 meters, the value of peak ground acceleration (α) ranges up 71,78 gal to 194,11 gal, the seismic vulnerability index (Kg) ranges up 2,06 x 10-07 (1/cm s2) to 1,86 x 10-05 (1/cm s2) and the value of ground shear strain (γ) range up 1,031 x 10-04 to 1,338 x 10-03. Area that are high risk of experiencing the ravages of earthquakes are Fulolo 3rd, Fulolo 4th, Fulolo 5th on the Gunung Sitoli Formations (QTg) because of those have a thick layer of soft sediments so that third of the area have a dominant low frequency (f0) and resulting low amplification factor (A0) are high as well as at risk for experiencing shifting rock and deformation of surface layer due to the propagation of earthquake waves.Keywords: Microtremor, HVSR, Dominant Frequency, Amplification, Peak Ground Acceleration, Seismic Vulnerability Index and Ground Shear Strain

Analisa Mikrotremor Menggunakan Metode HVSR untuk Mengetahui Karakteristik Bawah Permukaan Manifestasi Panas Bumi Diwak dan Derekan Berdasarkan Nilai Vp Vithya Arintalofa; Gatot Yulianto; Udi Harmoko
Jurnal Energi Baru dan Terbarukan Vol 1, No 2 (2020): Juli 2020
Publisher : Program Studi Magister Energi, Sekolah Pascasarjana, Universitas Diponegoro, Indonesia

Pengukuran Mikrotremor merupakan pengukuran seismik pasif untuk merekam getaran yang dihasilkan oleh aktivitas bumi ataupun aktivitas manusia, biasanya metode ini digunakan untuk memperkirakan tingkat kerusakan yang timbul akibat gempa bumi dan juga dapat digunakan untuk mengetahui kondisi struktur bawah permukaan berdasarkan frekuensi dominannya dan faktor amplifikasinya. Dalam analisis mikrotremor spektrum komponen horizontal dibandingkan terhadap komponen vertikal atau dikenal dengan metode HVSR. Parameter penting yang dihasilkan dari metode HVSR yaitu frekuensi natural dan amplifikasi. Dari hasil penelitian didapatkan P=persebaran nilai frekuensi dominan (fo) yang didapatkan dari hasil pengolahan data mikrotremor pada area manifestasi panas bumi Diwak dan Derekan berkisar antara 0,08 Hz sampai dengan 9,29 Hz, persebaran nilai faktor amplifikasi (Ao) bernilai antara 0,03 hingga dengan 7,07, sedangkan inversi kurva H/V menghasilkan nilai kecepatan gelombang P (VP) dan gelombang S (VS) dimana nilai VP berkisar antara 390 m/s sampai dengan 4.993 m/s dan nilai VS berada pada kisaran 190 m/s hingga 3.054 m/s.

Kajian Potensi dan Pemanfaatan Energi Panas Bumi di Wilayah Kerja Panas Bumi Patuha Ciwidey Mochammad Fa'iq Khasmadin; Udi Harmoko
Jurnal Energi Baru dan Terbarukan Vol 2, No 2 (2021): Juli 2021
Publisher : Program Studi Magister Energi, Sekolah Pascasarjana, Universitas Diponegoro, Indonesia

Potensi energi panas bumi yang dimiliki oleh Indonesia sangat besar dan pemanfaatannya belum optimal. Data dari Badan Geologi Kementrian ESDM menunjukkan bahwa potensi energi panas bumi di Indonesia mencapai 29,5 GW atau 40% dari potensi panas bumi di dunia. Pemanfaatan energi panas bumi di Indonesia untuk dikonversikan menjadi energi listrik sebesar 1.189MW (tahun 2014). Keunggulan pemanfaatan energi panas bumi adalah energi bersih dan ramah lingkungan. Energi panas bumi mampu menggantikan pembangkit berbahan bakar batu bara ataupun gas. Upaya dalam pemanfaatan energi panas bumi adalah dengan melakukan pembangunan PLTP di area WKP yang memiliki potensi energi panas bumi yang besar salah satunya adalah WKP Patuha Ciwidey yang masih masuk dalam WKP Pangalengan. Saat ini Kapasitas pembangkit yang dibangkitkan adalah mencapai 1x60MW. Kajian dalam penelitian ini bertujuan untuk mengetahui potensi dan pemanfaatan energi panas bumi di WKP Patuha Ciwidey. Teknologi yang digunakan pada PLTP Patuha Unit 1 adalah siklus uap kering (Direct Dry Steam Cycle) Fluida uap dialirkan secara langsung ke Turbin. Sistem konversi ini merupakan sistem konversi yang paling sederhana. Dalam kajian ini ditemukan bahwa secara lateral terdapat tiga reservoir di area Patuha yang saling terhubung diantara Kawah Putih Cibuni, dan Ciwidey yang dipisahkan oleh Sesar Normal Cimanggu sehingg memisahkan antara area reservoir Kawah Cibuni dan reservoir Kawah Putih, sedangkan sesar normal Cileulur memisahkan area reservoir Kawah Putih dan area reservoir Kawah Ciwidey. Sedangkan Kebutuhan uap yang digunakan dalam pembangkitan PLTP unit 1 Patuha yakni dengan inlet pressure 11 bar abs, tekanan kondensor 0.1 bar abs, dari hasil perhitungan diperkirakan unit 1 Patuha membutuhkan uap sekitar 370.8 ton/jam atau 103 kg/s dengan konsumsi uap rara-rata sebesar 6.75 ton/jam.MW. Dalam upaya menjaga dan mengembangkan pemanfaatan energi diperlukan perencanaan desain proyek seumur hidup long life sustainability, dengan mempertimbangkan kondisi lingkungan, prediksi sumur, perencanaan steamfield, dan simulasi reservoir.

Analisis Pemanfaatan Tidak Langsung Potensi Energi Panas Bumi di Indonesia Pradipta Ahluriza; Udi Harmoko
Jurnal Energi Baru dan Terbarukan Vol 2, No 1 (2021): Maret 2021
Publisher : Program Studi Magister Energi, Sekolah Pascasarjana, Universitas Diponegoro, Indonesia

Indonesia berkomitmen dalam pengembangan penggunaan energi baru dan terbarukan yang tercantum pada Undang-Undang, Peraturan Pemerintah, Peraturan Presiden, Peraturan Menteri, maupun peraturan pendukung lainnya. Tujuan dari analisis ini adalah untuk mengetahui secara tidak langsung pemanfaatan potensi energi panas bumi di Indonesia. Dengan kondisi geografi Indonesia yang terletak pada zona jalur cincin api, sehingga sistemnya mayoritas bertipe vulcanic (hidrothermal system) yang menyebabkan di setiap lapangannya memiliki potensi yang besar. Potensi ini menjadikannya prioritas pemerintah untuk mencapai bauran energi baru dan terbarukan paling sedikit 23% pada tahun 2025 dan 31% pada tahun 2050. Untuk mencapai target ini, pemerintah menentukan arah kebijakan dan rencana strategis yang tercantum pada Rencana Umum Energi Nasional (RUEN). Energi Panas Bumi dapat dimanfaatkan sesuai potensi daya yang dapat dihasilkan, yaitu PLTP.

Overview dan Analisis Potensi Pemanfaatan Langsung (Direct Use) Panas Bumi pada Wilayah Kerja Panas Bumi Dieng Jawa Tengah Ramdani Alfan Subekti; Udi Harmoko
Jurnal Energi Baru dan Terbarukan Vol 1, No 3 (2020): Oktober 2020
Publisher : Program Studi Magister Energi, Sekolah Pascasarjana, Universitas Diponegoro, Indonesia

Indonesia memiliki potensi energi panas bumi terbesar di Indonesia dunia, yang mencakup sekitar 40% dari potensi dunia atau pada 28.617 MW. Sistem energi panas bumi di negara ini adalah umumnya dengan sistem hidrotermal yang bersuhu tinggi yang lebih dari 225°C, dan hanya sedikit sistem hidrotermal yang memilikinya menurunkan suhu sekitar 150°C–225°C. Status potensi dan kapasitas terpasang disajikan pada Meski potensi panas bumi besar di Indonesia, hingga saat ini pemanfaatannya masih belum optimal. Sumber dengan suhu tinggi dapat digunakan untuk pembangkit listrik; namun, pembangkit listrik tenaga panas bumi dengan sistem binary dapat diterapkan pada sumber daya bersuhu sedang. Sumber daya suhu yang lebih rendah juga dapat digunakan untuk memanaskan bangunan, proses industri, greenhouses, hortikultura, akuakultur, pemandian air panas dan lain sebagainya. Dengan adanya manifestasi yang berada di WKP Dieng, sehingga dapat dijadikan bahan penelitian diantaranya : pembuatan water heating untuk pemenuhan homestay, pembuatan pemandian air panas dan lain sebagainya. untuk memulai pemanfaatan langsung (Direct Use) dengan memanfaatkan manifestasi air panas yang berada di WKP Dieng.

Co-Authors . Sahid Achmad Syaifuddin Zuhri Achmad Widodo Aditya Firdaus Agung Ardiyanto Agus Muhidin Agus Muhidin Agus Setyawan Agus Subagio Akrima Amalia Alchacindy Guenergar Anjar Oktikawati Asronj Bakkit Simanjuntak Berkah Fajar Tamtomo Kiono Cassandra Fitrianna Idat Dewi Andri Dian L Silalahi Diny Agustina Rahayu Djalal Er Riyanto Elvera Yuanita Rukmana Faradina A. P. Fazrin Oktafian Galih Candra Kusuma Gatot Yulianto Hernowo Danusaputro Hiskia Anggit Maulana Hotlan Simbolon I Gusti Ngurah Antaryama Ibnu Rasid Imam Baru Raharjo Imroatun Nikmah Iqbal Takodama Irham Nurwidyanto Irvan Ramadhan Istiqomah Ari Kusuma Iut Triutami Ivan Darren Alber Iwan Gunawan Jaka Windarta Jatmiko Endro Suseno Jonius Christian Harefa Laela Fitria Lestari, Puspa Luxy Rizal Fathoni M. Razi Maila Shofa Marcelinus Christwardana Mars Widodo Moch. Abdul Mukid Mochammad Fa'iq Khasmadin Moh. Irfan Saputra Haris Mohammad Sidik Mualimin Mualimin Muhammad Irham Muhammad Irham Nurwidiyanto Muhammad Nur Muhammad Ulin Nuha ABA Mustafid Mustafid Nabil Bawahab Nanang Didik Susilo Nurwahyudin, Dindin Syarief Pradipta Ahluriza Ramdani Alfan Subekti Redemtus Heru Tjahjana Rezyta Handani Ririn Sulpiani Rizkan, Muhammad Riznia Aji Salam Rr. Tony Yulianto Saad Abdurrahman Sahid Sahid Satriyo Adhy Sheyza Rery Dynza Anggary Sigit Darmawan Siti Helmyati Siti Zulaikhah Sri Widodo Agung Suedy Sudarno Sudarno Sugeng Widada Susantoro, Tri M Syamsul Ilmi Teguh Suroso Teguh Suroso Tony Yulianto Triana Triana Veratania Aisyah Veratania Aisyah Vithya Arintalofa Wahyu Festiawan Nurrochim Yose Rizal Triarto Yundari, Yundari Yusuf D. H. Yusuf Dewantoro Herlambang

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