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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Journal of Innovation and Applied Technology Jurnal Teknik Pengairan: Journal of Water Resources Engineering Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Teknika Jurnal Pengabdian Masyarakat untuk Negeri (UN-PENMAS) Jurnal Teknologi dan Rekayasa Sumber Daya Air Geosfera Indonesia
M. Amar Sajali
Teknik Pengairan Fakultas Teknik Universitas Brawijaya
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 Education Electrical & Electronics Engineering Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Physics Social Sciences Other

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Analisis Sebaran Genangan Banjir Pada Muara DAS Welang Dengan Menggunakan Program SFINCS (Super-Fast Inundation of Coasts) Vareza, Ervisto Thama; Dermawan, Very; Sajali, Muhammad Amar
Jurnal Teknologi dan Rekayasa Sumber Daya Air Vol. 6 No. 1 (2026): Jurnal Teknologi dan Rekayasa Sumber Daya Air (JTRESDA)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jtresda.2026.6.1.51

Abstract

Daerah Aliran Sungai (DAS) Welang di Jawa Timur semakin rentan terhadap banjir akibat curah hujan ekstrem dan kenaikan muka air laut. Penelitian ini bertujuan untuk menganalisis sebaran genangan compound flooding, yaitu banjir yang terjadi akibat kombinasi faktor fluvial, pluvial, dan pasang surut laut, menggunakan model numerik SFINCS (Super-Fast INundation of CoastS). Metodologi penelitian meliputi analisis hidrologi berupa uji kualitas data, analisis frekuensi curah hujan dan debit sungai, serta penentuan intensitas hujan jam-jaman. Kondisi batas laut dimodelkan menggunakan data pasang surut ekstrem untuk menggambarkan pengaruh kenaikan muka air laut. Hasil pemodelan menunjukkan bahwa skenario compound flooding menghasilkan luas dan kedalaman genangan yang lebih besar dibandingkan skenario tunggal. Selain itu, penerapan upaya mitigasi seperti normalisasi alur sungai, pembangunan tanggul sungai, dan tanggul laut terbukti mampu mengurangi area terdampak secara signifikan. Temuan ini dapat menjadi dasar dalam perencanaan mitigasi banjir dan adaptasi perubahan iklim di wilayah pesisir dan DAS Welang.
Studi Alternatif Perencanaan Pengendalian Banjir Sungai Petung di Pasuruan Setiawan, Dodi Bagus; Prasetyorini, Linda; Sajali, M. Amar
Jurnal Teknologi dan Rekayasa Sumber Daya Air Vol. 6 No. 1 (2026): Jurnal Teknologi dan Rekayasa Sumber Daya Air (JTRESDA)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jtresda.2026.6.1.50

Abstract

Banjir merupakan peristiwa meluapnya air yang melebihi kapasitas normal saluran, sehingga menggenangi wilayah daratan. Provinsi Jawa Timur, menurut data BNPB tahun 2024, menempati peringkat kedua dalam kejadian banjir terbanyak di Indonesia. Salah satu wilayah terdampak adalah Sungai Petung yang mengalir melalui Kota dan Kabupaten Pasuruan. Kejadian banjir signifikan terjadi pada 6 Mei 2023 dengan genangan setinggi 0,6 meter. Studi ini bertujuan merancang upaya pengendalian banjir di Sungai Petung melalui normalisasi sungai dan pembangunan tanggul. Tahapan perencanaan meliputi analisis debit banjir rancangan menggunakan HEC-HMS, pemodelan banjir dan pengendaliannya menggunakan HEC-RAS, serta estimasi rencana anggaran biaya. Hasil analisis menunjukkan bahwa debit banjir rancangan untuk kala ulang 25 tahun (Q25) sebesar 122,59 m³/s dan kala ulang 50 tahun (Q50) sebesar 154,92 m³/s. Hasil pemodelan menunjukkan adanya luapan di beberapa titik, sehingga dibutuhkan normalisasi dan pembangunan tanggul. Tanggul direncanakan dengan dua pendekatan, yaitu konvensional dan Building with Nature (BWN). Estimasi anggaran yang dibutuhkan untuk skenario normalisasi dan tanggul konvensional adalah Rp11.685.730.000, sedangkan untuk normalisasi dan tanggul BWN adalah Rp7.546.420.000.
Comparative Analysis of Rainfall Patterns in Jatigede Watershed Using the Huff Method Setiyowati, Yunita Ayu; Harisuseno, Donny; Sajali, M. Amar
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol. 16 No. 2 (2025)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2025.016.02.5

Abstract

The temporal distribution of rainfall plays a vital role in hydrological analysis, particularly in estimating peak flood discharge, which significantly impacts the design of flood control infrastructure. Understanding rainfall distribution patterns is essential for improving flood forecasting and water resource management. This study aims to compare the rainfall distribution patterns in the Jatigede Watershed (DAS Jatigede) using the Huff Quartile 1 to 4 method. Hourly rainfall data were collected from six rainfall stations: Bayongbong, Cikajang, Darmaraja, Jatigede, Leuwigintung, and Sadawangi, with Ground Station data used for validation. The analysis revealed that rainfall in the Jatigede Watershed is steeper than Huff Quartile 1, with peak intensity occurring earlier during events, indicating a high concentration of rainfall at the beginning of storms, which may affect flood peak formation and watershed response time. These findings underscore the need to adjust hydrological models to better reflect actual rainfall distribution. However, the study has limitations, including a relatively small number of observation stations, potential inaccuracies in rainfall measurements, and the Huff method’s limited ability to capture spatial rainfall variability. Addressing these limitations in future research is essential for enhancing flood risk assessment and hydrological modeling accuracy in the Jatigede Watershed.
Comparison of Correlation, PBIAS and RSR between Monthly, Daily, and Hourly GPM Rainfall Data Yunita Ayu Setiyowati; Donny Harisuseno; M. Amar Sajali
Jurnal Penelitian Pendidikan IPA Vol 11 No 6 (2025): June
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i6.11068

Abstract

Accurate precipitation data is critical for hydrological modeling, flood forecasting, and water resources planning. This study evaluates the performance of satellite-based rainfall estimates from the Integrated Multi-satellite Retrievals for GPM (IMERG) Final Run Version 06 by comparing them with ground-based observations from six stations in the Jatigede Reservoir catchment, West Java, Indonesia. The analysis covers the 2014–2023 period, aligning with the reliable availability of IMERG Final Run products, and examines three temporal resolutions: monthly, daily, and hourly. Statistical evaluation employed Pearson correlation coefficient (r), the ratio of RMSE to observed standard deviation (RSR), and Percent Bias (PBIAS). Results show strong agreement at the monthly scale (r = 0.84, RSR = 0.34, PBIAS ≈ +24%), suggesting suitability for long-term water resource assessments. However, performance declines at shorter timescales. At the daily scale, IMERG underestimates rainfall (PBIAS ≈ -27%) with moderate correlation (r = 0.24). The hourly scale shows the poorest performance (r = 0.10, RSR > 3.0, PBIAS < -50%), indicating limitations in capturing short-duration, high-intensity rainfall typical in tropical regions. These findings underscore the importance of temporal aggregation and bias correction when applying IMERG data for operational hydrology and flood modeling
An Integrated Performance Index for Decentralized Water Supply Systems: A Case Study of SiPAS in the Brantas River Basin Ussy Andawayanti; Runi Asmaranto; M. Amar Sajali; Ery Suhartanto; Mustafa Mukti Hidayat; Rizki Tri Utami
Jurnal Penelitian Pendidikan IPA Vol 11 No 8 (2025): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i8.12137

Abstract

To develop and validate an Integrated Performance Index Model (IPIM) for evaluating Simple Water Supply Systems (SiPAS) in the Brantas River Basin, Indonesia. We surveyed, audited, and interviewed stakeholders at 31 SiPAS sites. Latent constructs were tested using SEM–PLS, and dimension weights were optimized with the Generalized Reduced Gradient method. The model explained system performance well (R² = 0.95) and showed high predictive reliability. The technical dimension exerted the strongest influence (72.10%), followed by managerial (26.70%) and social (15.10%) factors. The index differentiated low and high performing sites and was consistent with field audit findings. A companion mobile application enabled real time reporting and feedback to strengthen community participation. IPIM provides a concise, scalable framework for assessing decentralized water supply, prioritizing technical improvements while supporting managerial and social strengthening, and can inform investment and governance decisions for rural water services.
Integrating Irrigation and Potable Water via a Pump-Fed Reservoir: Operational Scenarios and Economic Feasibility in Sukodono Rahmah Dara Lufira; Suwanto Marsudi; Ussy Andawayanti; M. Amar Sajali; Rizki Tri Utami; Santi Sari; Rizki Ramadani Pratama
Jurnal Penelitian Pendidikan IPA Vol 11 No 10 (2025): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i10.12607

Abstract

The Sukodono Reservoir (Gresik, East Java, Indonesia) is a pump-fed, multi-compartment system integrating irrigation and potable supply. We assess scenario-based operations and an economic appraisal. Three vertical-turbine pumps are installed (3×150 L/s); routine operation uses two units at 81% efficiency, yielding 243 L/s for 12 h/day (10.498 m³/day), with the third unit as standby/peak. By 2039, the population is projected at 30.801, requiring 22 L/s, supplied by a 30 L/s WTP. Irrigation storage targets are 120.000 m³ (250 ha core plantation), 270.000 m³ (2.250 ha inter-cropping), and 546.750 m³ (secondary crops). Six phased-expansion scenarios over six years were evaluated. Results show the designed operation reliably meets the 22 L/s potable demand while achieving the irrigation storage targets across scenarios. Base-case economics at a 5.50% discount rate (WACC) indicate IRR 18.50%, BCR ≈ 1.00 (break-even), and payback 7.10 years. We conclude that pump-fed reservoirs can integrate rural water supply and dryland irrigation effectively, although economic performance is marginal under the base case; viability improves with efficiency gains and prudent O&M/Fuel-Cost control.
Permodelan Fluida Dinamik pada Pelimpah Bendungan Karangnongko menggunakan Aplikasi AutoDesk CFD Shadra, Ken Haidar; Sisinggih, Dian; Sajali, Amar
Jurnal Teknologi dan Rekayasa Sumber Daya Air Vol. 6 No. 2 (2026): In Press
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jtresda.2026.6.2.60

Abstract

Bendungan Karangnongko yang terletak pada perbatasan Kabupaten Bojonegoro dan Kabupaten Blora di Sungai Bengawan Solo memiliki Pelimpah yang terdiri dari 9 pelimpah dengan pintu radial, pelimpah bebas, dan 2 pipa PLTM. Bendungan Karangnongko dibangun sebagai penyuplai air irigasi, air baku, pembangkit listrik tenaga mikrohidro, dan pengendalian banjir. Dalam proses perencanaannya, diperlukan analisa desain menggunakan uji model untuk mengetahui karakteristik alirannya. Tujuan penelitian ini adalah untuk mengetahui kondisi hidrolika aliran di atas pelimpah Bendungan Karanongko menggunakan pendekatan teoritis dan permodelan Computational Fluid Dynamics (CFD), kemudian dilakukan perbandingan kondisi hidrolika aliran di atas pelimpah antara pendekatan teoritis dan permodelan CFD dengan uji model fisik. Kedua metode tersebut dibandingkan menggunakan metode Root Mean Square Error untuk mengetahui kemiripan kedua metode tersebut. Analisis menggunakan skema debit banjir rancangan Q100, Q1000, dan QPMF dengan setiap debit banjir menggunakan skema bukaan 9 pintu yang memiliki ketinggian bukaan menyesuaikan debit yang lewat. Perbandingan ketiga metode tersebut dilakukan dengan menggunakan metode Root Mean Square Error untuk menilai keakuratan tiap metode.
Co-Authors Adilah, Ahmad Daffa Aufa Hanan A Beselly Putra, Sebrian Mirdeklis Camila, Adristi Nur Dewanti, Wahyuning Dian Sisinggih Donny Harisuseno Donny Harisuseno Donny Harisuseno Ery Suhartanto Haribowo , Riyanto Haribwowo, Riyanto Keisuke Murakami Linda Prasetyorini Marsudi, Marsudi Mustafa Mukti Hidayat Rahmah Dara Lufira Rizki Ramadani Pratama Rizki Tri Utami Rizki Tri Utami Runi Asmaranto Runi Asmaranto Santi Sari Setiawan, Dodi Bagus Setiyowati, Yunita Ayu Shadra, Ken Haidar Sofriansyah, Rafi Satria Sumiadi, Sumiadi Suwanto Marsudi Ussy Andawayanti Vareza, Ervisto Thama Very Dermawan Very Dermawan Winnie Meilinda Dewi Yunita Ayu Setiyowati