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All Journal JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) JOIV : International Journal on Informatics Visualization Eksakta : Berkala Ilmiah Bidang MIPA Jurnal Tecnoscienza CERMIN: Jurnal Penelitian Jurnal Pengabdian Masyarakat Bangsa
Dasapta Erwin Irawan, Dasapta Erwin
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Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Rintisan Kawasan Binaan di Lereng Selatan Gunung Manglayang Jawa Barat Wiratmo, Joko; Irawan, Dasapta Erwin; Sulistyawati, Endah
Jurnal Pengabdian Masyarakat Bangsa Vol. 2 No. 8 (2024): Oktober
Publisher : Amirul Bangun Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59837/jpmba.v2i8.1437

Abstract

Wilayah lereng Selatan Gunung Manglayang Jawa Barat, mengalami kerusakan lingkungan akibat perkembangan pembangunan sebagai kota pendidikan dan pemukiman, termasuk penurunan kualitas air tanah dan krisis air bersih. Program “Keluarga Sadar Lingkungan” (Kadarling) dirancang untuk meningkatkan kesadaran generasi muda terhadap pelestarian lingkungan yang dirintis untuk wilayah binaan  selatan Manglayang. Kegiatan pengabdian masyarakat berupa pelatihan ini dilakukan di SMA Negeri 24 Bandung yang diikuti oleh 72 siswa yang terbagi dalam dua kelompok yakni kelompok pertama mengikuti sesi edukatif mengenai cuaca, iklim, air tanah, dan peranan pohon dalam ekosistem, sementara kelompok kedua terlibat dalam praktikum pengukuran porositas tanah, pengamatan awan, dan teknik penanaman pohon. Hasil kegiatan menunjukkan peningkatan pemahaman mahasiswa tentang interaksi antara faktor-faktor lingkungan tersebut dan memberikan keterampilan praktis terkait konservasi lingkungan. Program ini diharapkan  efektif dalam meningkatkan kesadaran lingkungan siswa dan keluarganya serta memberikan kontribusi positif terhadap penghijauan di lingkungan sekolah.
Efficient 1D Heat Equation Solver: Leveraging Numba in Python Herho, Sandy Hardian Susanto; Kaban, Siti Nurzannah; Irawan, Dasapta Erwin; Kapid, Rubiyanto
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 25 No. 02 (2024): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol25-iss02/487

Abstract

This paper presents a Numba-based solver for the 1D Heat Equation, seamlessly blending Python’s readability with Numba’s dynamic Just-In-Time (JIT) compilation. The explicit method exhibits a notable runtime reduction from 8.324 s to 4.035 s, while the implicit method sees a more pronounced improvement, decreasing from 9.970 s to 1.195 s. Statistical tests confirm the statistical significance of these efficiency gains. Future research directions include extending the solver to multidimensional heat equations, exploring advanced parallelization techniques, and implementing dynamic parameter optimization strategies. Collaboration with domain experts for real-world applications is also envisioned to validate the solver’s performance and impact. In summary, the symbiosis of Python and Numba in crafting an optimized 1D Heat Equation solver marks a pivotal advancement in efficient numerical solutions. This research holds promise for diverse scientific
Design and Reliability Analysis of Four-Legged Jacket Type Offshore Platform in North Java Sea Kaban, Siti; Herho, Sandy Hardian Susanto; Tawekal, Ricky; Irawan, Dasapta Erwin
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 01 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss01/550

Abstract

In ideal conditions, offshore platform design follows standardized international criteria such as the American Petroleum Institute Recommended Practice 2A-LRFD (API RP2A-LRFD) to ensure structural reliability and safety. However, the real conditions in the Java Sea present unique challenges, as environmental loading patterns and regional factors may differ from those assumed in global standards. This study proposes a comprehensive solution through combined structural analysis and reliability assessment using Monte Carlo simulation methods. The urgency of this research stems from the critical need to validate and potentially adjust design standards for regional applications, ensuring the long-term safety and reliability of offshore structures in Southeast Asian waters. The research objectives focus on evaluating the structural reliability of a four-legged jacket type platform using both deterministic and probabilistic approaches, specifically assessing the applicability of API RP2A-LRFD criteria to Java Sea conditions. Results demonstrate that while the structure meets basic design criteria, the reliability indices (β = 16.70 for LRFD, β = 22.29 for unfactored) suggest current load factors may be overly conservative for regional conditions.
Pemetaan Pola Aliran Air Tanah di Sekitar Kali Sumpil Kota Malang Irvandi, Mukhlis Arief; Siswoyo, Hari; Irawan, Dasapta Erwin
JURNAL TECNOSCIENZA Vol. 6 No. 2 (2022): TECNOSCIENZA
Publisher : JURNAL TECNOSCIENZA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51158/tecnoscienza.v6i2.717

Abstract

Penelitian ini dilakukan dengan tujuan untuk memetakan pola aliran air tanah di sekitar Kali Sumpil di wilayah Kota Malang. Lokasi penelitian ini adalah di segmen Kali Sumpil sepanjang 5,6 km yang mengalir mulai dari Kecamatan Lowokwaru hingga ke pertemuan antara Kali Sumpil dan Kali Sari di Kecamatan Blimbing, Kota Malang. Pola aliran air tanah di lokasi penelitian dipetakan berdasarkan elevasi muka air tanah yang diukur dari 43 lokasi sumur gali milik warga yang tersebar di sepanjang aliran Kali Sumpil tersebut. Elevasi muka air tanah pada sumur gali warga di lokasi penelitian berkisar antara +493,88 m dpl di bagian hulu hingga +436,70 m dpl di bagian hilir. Elevasi muka air tanah tertinggi berada pada sumur gali SG-26 yang berada di sebelah kanan aliran bagian hulu Kali Sumpil, sedangkan elevasi muka air tanah terendah berada pada sumur gali SG-25 di sebelah kiri aliran bagian hilir Kali Sumpil. Secara umum, aliran air tanah di lokasi penelitian mengalir dari arah Barat Laut menuju ke arah Tenggara bersesuaian dengan arah aliran Kali Sumpil. Hubungan antara air tanah dan air permukaan adalah air tanah mengisi air permukaan Kali Sumpil.
ANALISIS RESPON STATIK DAN DINAMIK PADA BAGIAN BENDUNGAN URUGAN DARI BENDUNGAN MELATI Ramadhan, Gumilar; Kartiko, Rendy Dwi; Taufiq, Ahmad; Irawan, Dasapta Erwin
Jurnal Lingkungan dan Bencana Geologi Vol 15, No 3 (2024)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v15i3.502

Abstract

ABSTRAKDalam pembangunan dan operasionalnya, bendungan dapat mengalami kerusakan. Salah satu faktor yang dapat mengakibatkan kerusakan pada bendungan yaitu gempa bumi. Kerusakan tersebut jika tidak diantisipasi dapat mengakibatkan kegagalan dan bencana yang dapat berakibat kerugian materil dan jiwa. Untuk menghindari bencana maka diperlukan perencanaan yang baik sebelum pembangunan. Respon bendungan, baik kondisi statik dan dinamik, perlu diketahui untuk mengevaluasi keamanan dari desain bendungan. Bendungan Melati direncanakan merupakan bendungan komposit dengan jenis bendungan urugan zonasi pada sisi kiri dan bendungan roller-compacted concrete (RCC) pada sisi kanan. Analisis menggunakan metode finite element dilakukan terhadap bagian bendungan urugan. Analisis respon statik secara sequential menggunakan 23 lift didapatkan adanya settlement berbentuk oval pada tengah core dengan settlement terbesar 34 cm dan displacement horizontal sebesar 8 cm menuju sisi downstream di akhir konstruksi. Pada penelitian ini digunakan rekaman akselerasi berdasarkan deaggregrasi analisis seeismic hazard untuk tiga mekanisme gempa berbeda yang kemudian dilakukan spectral acceleration amplification terhadap PGA. Berdasarkan parameter controlling earthquake digunakan gempa Tohoku dengan amplifikasi 0.8 untuk mekanisme megathrust, gempa Iwate dengan amplifikasi 2.5 untuk mekanisme patahan, dan gempa Patea dengan amplifikasi 4.3 untuk mekanisme shallow crustal. Deformasi permanen berdasarkan analisis stress redistribution pada akhir gempa didapatkan deformasi terbesar yaitu 22 cm untuk gempa Tohoku, 29 cm untuk gempa Iwate, dan 19.9 cm untuk gempa Patea. Berdasarkan analisis keamanan lereng bendungan memiliki keamanan yang sangat baik pada kondisi statik dan cukup pada kondisi dinamik. Walau demikian, faktor keamanan di sisi upstream mendekati 1 pada akhir gempa Tohoku dan Iwate dan diasumsikan tidak aman.Kata kunci: analisis numerik, analisis respon statik, analisis respon dinamik, analisis stabilitas, BendunganABSTRACTDuring construction and operation, dams can experience damage. One factor that can cause damage to a dam is an earthquake. If this damage is not anticipated, it can result in failure and disaster which can result in material and life losses. To avoid such disasters, good planning is needed before construction. The response of the dam, both static and dynamic conditions, needs to be known to evaluate the safety of the dam design. The Melati dam is planned to be a composite dam with a zoned fill dam on the left side and a roller-compacted concrete (RCC) dam on the right side. Analysis using the finite element method was carried out on the embankment dam section. Sequential static response analysis using 23 lifts showed that there was an oval-shaped settlement in the middle of the core with the largest settlement of 34 cm and a horizontal displacement of 8 cm towards the downstream side at the end of construction. In this study, acceleration recordings were used based on deaggregation of seismic hazard analysis for three different earthquake mechanisms and then spectral acceleration amplification was carried out based on the obtained PGA. Based on the controlling earthquake parameters, the Tohoku earthquake was used with an amplification of 0.8 for the megathrust mechanism, the Iwate earthquake with an amplification of 2.5 for the fault mechanism, and the Patea earthquake with an amplification of 4.3 for the shallow crustal mechanism. Permanent deformation based on stress redistribution analysis showed that the largest deformation was 22 cm for the Tohoku earthquake, 29 cm for the Iwate earthquake, and 19.9 cm for the Patea earthquake. Based on the safety analysis, the dam slopes have very good safety factors in static condition and sufficient in dynamic conditions. However, factor of safety on the upstream side are close to 1 at the end of Tohoku and Iwate earthquakes which was assumed to be not safe.Keywords: numerical analysis, static response analysis, dynamic response analysis, stability analysis, Dam
Performance Evaluation of a Simple Feed-forward Deep Neural Network Model Applied to Annual Rainfall Anomaly Index (RAI) Over Indramayu, Indonesia Herho, Sandy Hardian Susanto; Irawan, Dasapta Erwin; Fajary, Faiz Rohman; Suwarman, Rusmawan; Kaban, Siti Nurzannah
JOIV : International Journal on Informatics Visualization Vol 9, No 3 (2025)
Publisher : Society of Visual Informatics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62527/joiv.9.3.1984

Abstract

Indramayu is a district in West Java that is known for being the leading producer of rice and brackish salt. The production of these two commodities is strongly influenced by hydroclimatological conditions, making accurate and reliable long-term estimates crucial. In this study, we evaluated a simple feed-forward deep neural network (DNN) model that could potentially be used as a candidate for statistical guidance to improve the accuracy of a mesoscale numerical climate model. We used the spatial average of the accumulated annual rainfall of the Climate Hazards Group InfraRed Precipitation with Station (CHIRPS) data as an input time series with a time range from 1981 to 2022. This data was then processed into annual rainfall anomaly index (RAI) data. The Annual RAI was divided into training and test sets, and the feed-forward DNN model was fitted to the annual RAI in the training set. The accuracy of the model was then tested in the test set using the root-mean-square error (RMSE) metric. Our study shows that the feed-forward DNN model is unsuitable for estimating the annual RAI over Indramayu. The RMSE values are significantly high in the training and test sets.
SIFAT KIMIA AIR TANAH DAN AIR PERMUKAAN DI SEPANJANG ALIRAN SUNGAI JILU Yuniar, Frida Rani; Siswoyo, Hari; Irawan, Dasapta Erwin
CERMIN: Jurnal Penelitian Vol 7 No 1 (2023): JANUARI - JULI
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat - Universitas Abdurachman Saleh Situbondo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36841/cermin_unars.v7i1.2629

Abstract

Pola interaksi air tanah dengan air permukaan di Sungai Jilu adalah air tanah mengalir masuk ke sungai. Hal ini menimbulkan dugaan bahwa air tanah dan air permukaan memiliki sifat kimia yang identik. Studi ini dilakukan dengan tujuan untuk mengidentifikasi sifat kimia air tanah dari sumur gali milik penduduk dan air permukaan dari Sungai Jilu. Lokasi studi ini berada di sepanjang aliran Sungai Jilu yang mengalir di wilayah Kecamatan Pakis Kabupaten Malang dan Kecamatan Kedungkandang Kota Malang. Pengambilan contoh air dilaksanakan di 9 lokasi yang terdiri atas 3 lokasi sumur gali yang berada di sisi kanan aliran sungai, 3 lokasi sumur gali yang berada di sisi kiri aliran sungai, dan 3 lokasi di badan Sungai Jilu. Sifat kimia air ditentukan dengan menggunakan Model Diagram Trilinier Piper. Berdasarkan model tersebut, dapat diidentifikasikan bahwa sifat kimia air tanah dan air permukaan di sepanjang aliran Sungai Jilu secara umum adalah identik. Baik air tanah maupun air permukaan di lokasi studi secara umum memiliki fasies Ca2++Mg2+–HCO3–.
Hydrogeological Evaluation Based on Water Quality Parameters and Groundwater Level Conditions in Kolaka and Tangketada Basins, Southeast Sulawesi Salim, Muhammad Abdul Rahman; Irawan, Dasapta Erwin; Sadisun, Imam Achmad; Herlambang Fredomeseliano, Bonanza; Kurniawan
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 04 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss04/623

Abstract

This study aims to evaluate the hydrogeological conditions of Pomalaa through analysis of groundwater flow patterns, groundwater level fluctuations, and water quality parameters. The methods used include geological and hydrogeological mapping, groundwater level measurements, and delineation of groundwater basins based on regional topography and lithological data. Water quality analysis was conducted by measuring temperature, Total Dissolved Solids (TDS), electrical conductivity (EC), and pH parameters. The study area consists of five main rock units, with three types of aquifers based on lithological characteristics, namely intergranular and fractured aquifers, low-yield aquifers, and rare aquifers. The results of the study show that groundwater flow patterns follow natural hydraulic gradients, but fluctuate due to environmental changes and mining activities. Several points show significant water quality degradation, with pH, TDS, and EC values exceeding drinking water thresholds. The water quality index shows variations from very good (57), good (49), poor (23), very poor (22), to unfit for drinking (48). The solution offered by this study is the need for mitigation strategies and sustainable water resource management, which is of utmost urgency to maintain ecosystem balance and ensure the availability of clean water for the community and industry in the future.
Co-Authors Ahmad Taufiq Cut Novianti Rachmi, Cut Novianti Defny Holidin Deny Juanda Puradimaja Fajary, Faiz Rohman Galih Kusumah, Galih hari siswoyo Hendy Irawan, Hendy Herho, Sandy Hardian Susanto Herlambang Fredomeseliano, Bonanza Imam Achmad Sadisun Irvandi, Mukhlis Arief Juneman Abraham Kaban, Siti Kaban, Siti Nurzannah Kartiko, Rendy Dwi Keukeu Kaniawati Rosada Kurniawan Kustiati Kustiati Mitra Djamal Moch Tanzil Multazam Mukti, Rino Rakhmata Mulyaningsih, Indrya Nurhazman Abdul Aziz, Nurhazman Abdul Ramadhan, Gumilar Rubiyanto Kapid Salim, Muhammad Abdul Rahman Septriono Hari Nugroho Sparisoma Viridi Sulistyawati, Endah Suwarman, Rusmawan Tawekal, Ricky Wiratmo, Joko Yuniar, Frida Rani