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All Journal Jurnal Konstruksia JURNAL SIPIL SAINS SemanTIK : Teknik Informasi Civil Engineering Journal Rancang Bangun Journal TEPAT: Teknologi Terapan untuk Pengabdian Masyarakat INTEK: Jurnal Penelitian Stabilita : Jurnal Ilmiah Teknik Sipil Fakultas Teknik Universitas Halu Oleo Kendari EPI International Journal of Engineering Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan Lowland Technology International Jurnal Teknik Sumber Daya Air Riset Sains dan Teknologi Kelautan Journal of Muhammadiyah’s Application Technology Bambu Laut: Jurnal Pengabdian Masyarakat Geoid - Journal of Geodesy and Geomatics
Riswal Karamma
Departemen Teknik Sipil, Fakultas Teknik, Universitas Hasanuddin
Agriculture, Biological Sciences & Forestry Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Public Health Social Sciences Transportation

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Journal : Civil Engineering Journal

 1 
Effect of Porous Rectangular Type Baffle Block Angle on Hydraulic Jump Downstream of Spillway Djunur, Lutfi Hair; Pallu, Muhammad S.; Karamma, Riswal; Bakri, Bambang
Civil Engineering Journal Vol 10, No 10 (2024): October
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2024-010-10-04

Abstract

The elevation of the water surface upstream of the spillway structure increases significantly due to damming, leading to a rapid, supercritical flow downstream. This flow transitions from supercritical to subcritical, resulting in hydraulic jumps (Lj). The placement of a porous rectangular baffle block in the chute acts as an energy dissipator within the channel. This study aimed to investigate the effect of the angle of the porous rectangular baffle block on energy dissipation and hydraulic jumps downstream of the spillway structure. The experiment utilized a two-dimensional (2D) approach to evaluate energy dissipation and hydraulic jumps under various placements of the porous rectangular baffle block in the chute. The results indicated that the water level above the weir (hd) increased, along with turbulence downstream, while energy loss decreased. However, the efficiency of energy dissipation improved as variations in the water level above the weir decreased. A baffle block with an angle (α) of 60° was found to be the most effective in dissipating flow energy and shortening hydraulic jumps. Additionally, an empirical equation was developed for the hydraulic jump length as a function of the downstream Froude number (Fr): Lj=yt (k α hd(Fr-1)^4). The porous rectangular baffle block proved advantageous as it gradually dissipates flow velocity through its pore openings, preventing flow momentum reversal. Doi: 10.28991/CEJ-2024-010-10-04 Full Text: PDF
Climate Change Impacts on Rainfall Variability and Adaptive Reservoir Operation in a Multi-Reservoir System Leda, Alexander; Tahir Lopa, Rita; Maricar, Farouk; Karamma, Riswal
Civil Engineering Journal Vol. 11 No. 10 (2025): October
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-10-08

Abstract

Changes in rainfall patterns driven by climate change have altered the hydrological regime of river basins, creating substantial challenges for water resources management, particularly in the operation of the Batutegi cascade system comprising the Batutegi Dam, Way Sekampung Dam, Argoguroh Weir, Margatiga Dam and Jabung Weir. This study assesses the impacts of climate change on rainfall intensity, dependable flow, and water allocation modeling within the Sekampung River Basin. The analysis employed five rainfall datasets downscaled from the NASA Earth Exchange Downscaled Climate Projections at 30 arc-seconds (NEX-DCP30) and simulated using five CMIP6 models for both the historical period (1980–2014) and future projections (2024–2100). Results indicate that CMIP6 projections reproduce rainfall patterns reasonably well during January–February and May–July, but perform less consistently in March–April and October–November. Most models tend to overestimate the mean annual rainfall. Rainfall variability contributes to pronounced fluctuations in river discharge, particularly during the dry season. Dependable flows show marked changes, especially within the exceedance probability range of Q10% to Q100%. Although an overall increasing rainfall trend is observed, the system is still able to satisfy water demand under the 2023 operating rules, with potential deficits persisting during critical periods. Optimization modeling further demonstrates the necessity of adaptive reservoir operation rules under climate change, which could improve the reliability of meeting multisectoral demands to approximately 80%. These findings underscore the importance of incorporating climate model projections into watershed-based water resources management to strengthen resilience against extreme hydroclimatic variability.
Co-Authors A Ilda Puspita Ahmad Sumakin Ahmad Syarif Sukri Almunawir, Asrif Andi Subhan Mustari Aprian, Syahra Dewi Arsyad Thaha Ashury, Ashury Aslamil Taqwa Bambang Bakri Chairul Paotonan Djunur, Lutfi Hair Evi Aprianti Farauk Maricar Farouk Maricar Iffaty, Athiya Ildha Dwi Puspita Izzaty, Atika Kato, Muh Alvin Achmad Kuba, Muhammad Syafa'at S. Leda, Alexander Lopa, Rita Tahir Maricar, Farouk Muh Arsyad Thaha Muh Saleh Pallu Muhammad Farid Maricar Muhammad Saleh Pallu Mukhsan Hatta Mukhsan Putra Hatta, Mukhsan Putra Mustamin, Muhammad Rifaldi Mustari, Andi Subhan Nenny, Nenny Pallu, Muhammad S. Rita Lopa Rita Tahir Lopa Rita Tahir Lopa Saleh Pallu Silman P Manda Silman Pongmanda Subhan Mustari Sugianto Sugianto Tahir Lopa, Rita Talib, Muhammad Thoha Thaha, Muhammad Arsyad Wijayanti, Regita Faridatunisa Zulmi, Ahmad Syafi'i