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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 Prosiding Seminar Nasional Teknik Sipil UMS Riset Sains dan Teknologi Kelautan Journal of Muhammadiyah’s Application Technology Bambu Laut: Jurnal Pengabdian Masyarakat
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 Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Public Health Social Sciences Transportation

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Hydrological Analysis In Selecting Flood Discharge Method In Watershed Of Kelara River Mustamin, Muhammad Rifaldi; Maricar, Farouk; Karamma, Riswal
INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v8i2.2874

Abstract

For Engineers involved in planning and construction of water resources building, hydrology becomes very important data. In terms of planning stage in water resources especially waterworks, it is known that design flood discharge closed to field realistic conditions is often needed in order that a planned construction is able to control flood discharge. Several previous researches in choosing flood discharge selection method have diverse depending on observed watershed. One method in determining selected flood discharge by verification using Creager diagram, by comparing discharge calculation results of several Synthetic Unit Hydrograph (SUH) with infrastructure flood discharge (AWLR result) in observation point. This research aims to obtain  the most suitable synthetic unit hydrograph and close to analysis result of measured discharge frequency, and Creager diagram in Kelara watershed (DAS). Based on the calculation of design flood discharge according to rainfall data using synthetic unit hydrograph of Nakayasu, ITB I, ITB II, and SCS (HEC-HMS) as well as the calculation of design flood discharge according to collected data, it is concluded that the synthetic unit hydrograph method closest to design flood discharge with measured discharge rate and Q1000 rate of Creager diagram is SCS. Flood discharge rate obtained according to HSS SCS method using HEC-HMS  4.8 application in period of 2 years  is 658,40 m3/s, 25 years is 682,70 m3/s, 50 years is 787,00 m3/s, 100 years is 885,70 m3/det, and 1000 years is 1202,60 m3/s
Pengaruh Jarak Struktur Pemecah Gelombang Model Hybrid Engineering Terhadap Panjang Dan Tinggi Gelombang (Penelitian Laboratorium) Zulmi, Ahmad Syafi'i; Kato, Muh Alvin Achmad; Karamma, Riswal; Kuba, Muhammad Syafa'at S.
Journal of Muhammadiyah’s Application Technology Vol. 1 No. 2 (2022)
Publisher : Universitas Muhammadiyah Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26618/jumptech.v1i2.8925

Abstract

Hybrid Engineering dibangun dengan menggunakan bahan-bahan yang tersedia secara local seperti kayu, bambu, ranting, dan dahan pohon mangrove. Penelitian ini bertujuan untuk mengetahui nilai refleksi dan transmisi gelombang pada model pemecah gelombang model hybrid engineering, kemudian menganalisi parameter-parameter yang berpengaruh terhadap koefisien refleksi dan transmisi pada pemecah gelombang. Penelitian ini dilakukan di Laboratorium Hidrolika Teknik Sipil Fakultas Teknik Universitas Hasanuddin. Metode yang digunakan berbasis eksperimental. Karakteristik gelombang yang dihasilkan terdiri dua variasi priode dan dua variasi kedalaman air serta dua variasi stroke. Pembacaan puncak dan lembah gelombang dilakukan secara otomatis melalui wave monitor. Dari hasil penelitian dapat disimpulkan semakin besar jarak struktur pemecah gelombang maka gelombang refleksi akan semakin kecil sedang untuk gelombang transmisi yang dihasilkan akan semakin tinggi.
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.
Adaptive Hydrodynamic Modeling for Sustainable Irrigation Management in Tidal Swamp Regions Edwar, Raden M.; Karamma, Riswal; Maricar, Farouk; Hatta, Mukhan P.
Civil Engineering Journal Vol. 12 No. 1 (2026): January
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2026-012-01-015

Abstract

The Lalan River functions as the primary water source and plays an important role in supporting irrigation systems and water management in tidal swamp areas. However, water management in this region still faces challenges such as salinity intrusion and unstable water distribution, while conventional approaches applied have not fully considered the hydraulic characteristics and hydrodynamic conditions of the waters. This study aims to analyze the hydrodynamic characteristics of the Lalan River as the main water system in the tidal swamp irrigation area of D.I.R. Karang Agung Hilir, Banyuasin Regency, South Sumatra Province, Indonesia, in order to design an effective water management strategy for agricultural irrigation. The research methods include bathymetry, tidal, current, and salinity measurements. Hydrodynamic modeling was applied to analyze aquatic phenomena, including flow dynamics and salinity distribution patterns in tidal swamp areas. The hydrodynamic model was calibrated and validated using field data with a Root Mean Square Error (RMSE) value of 0.170 m to ensure the reliability of the simulation. The analysis results show that the application of a one-way flow system can significantly reduce salinity, from around 2–5 ppt in the old system to around 1–2 ppt during high tide and below 0.5 ppt during low tide, or a reduction of up to ±60%. This reduction allows river water to be used more effectively for agricultural irrigation. The novelty of this research lies in the adaptive hydrodynamic approach based on seasonal hydrological conditions as a foundation for designing sustainable water management systems in tidal swamp areas according to the hydrotopography of the region.
Kajian Refleksi Gelombang pada Breakwater dengan Unit Lapis Lindung UH-Pod R Rusmawati; Muhammad Arsyad Thaha; Riswal Karamma
Prosiding Seminar Nasional Teknik Sipil UMS 2026: Prosiding Seminar Nasional Teknik Sipil UMS
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pemecah gelombang (breakwater) merupakan struktur pantai yang berfungsi untuk mereduksi energi gelombang sehingga dapat melindungi kawasan pelabuhan dan wilayah pesisir dari kerusakan akibat gelombang laut. Salah satu parameter penting dalam evaluasi kinerja pemecah gelombang adalah koefisien refleksi gelombang yang menunjukkan besarnya energi gelombang yang dipantulkan kembali oleh struktur. Perkembangan teknologi struktur pantai mendorong penggunaan unit beton pracetak dengan bentuk khusus sebagai lapis lindung (armor layer), salah satunya adalah unit UH-Pod yang dirancang untuk meningkatkan stabilitas dan kemampuan disipasi energi gelombang melalui mekanisme interlocking antar unit. Penelitian ini bertujuan untuk mengkaji karakteristik refleksi gelombang pada pemecah gelombang yang menggunakan lapis lindung UH-Pod. Pada penelitian ini menggunakan pendekatan eksperimental di laboratorium. Hasil penelitian menunjukan bahwa penggunaan unit beton UH-Pod sebagai lapis lindung pemecah gelombang memberikan pengaruh terhadap karakteristik refleksi gelombang. Nilai koefisien refleksi yang diperoleh antara 0,07 hingga 0,50 sebesar 83% dari simulasi yang dilakukan, hal ini menunjukkan bahwa struktur pemecah gelombang dengan lapis lindung UH-Pod mampu mereduksi energi gelombang melalui mekanisme disipasi energi pada permukaan struktur. Bentuk geometri unit UH-Pod yang memiliki rongga dan sistem interlocking antar unit mampu meningkatkan disipasi energi gelombang. Sehingga dapat disimpulkan bahwa lapis lindung UH-Pod cukup efektif dalam mereduksi energi gelombang karena cukup kecil bagian yang direfleksikan.
STUDI LABORATORIUM DISIPASI DAN REFLEKSI GELOMBANG PADA SUSUNAN PIPA SEBAGAI PEMECAH GELOMBANG Riswal Karamma; Ashury Ashury; Nenny Karim; Asrif Almunawir
Riset Sains dan Teknologi Kelautan Volume 2, Nomor 1, Tahun 2019
Publisher : Departemen Teknik Kelautan Fakultas Teknik Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/sensistek.v2i1.13082

Abstract

Penelitian ini dilakukan dalam skala laboratorium. Pengamatan dilakukan terhadap refleksi gelombang dan disipasigelombang yang terjadi pada model. Model peredam gelombang berupa susunan pipa yang divariasikan dengan tigakekasaran. Variabel yang diamati dan dianalisis adalah tinggi gelombang datang (Hi), tinggi gelombang refleksi(Hr), tinggi gelombang transmisi (Ht), panjang gelombang (L), koefisien refleksi (Kr), koefisien transmisi (Kt), dankoefisien disipasi gelombang (Kd). Hasil penelitian memperlihatkan bahwa nilai koefisien refleksi (Kr) semakinmembesar dengan meningkatnya kecuraman gelombang (Hi/L) dan meningkatnya tinggi gelombang datang, tetapinilai koefisien disipasi semakin mengecil. Juga semakin besar kekasaran dinding pipa maka koefisien refleksi (Kr)dan koefisien disipasi (Kd) semakin besar.
Co-Authors A Ilda Puspita Ahmad Sumakin Ahmad Syarif Sukri Andi Subhan Mustari Arsyad Thaha Ashury Ashury Ashury, Ashury Aslamil Taqwa Asrif Almunawir Bambang Bakri Chairul Paotonan Djunur, Lutfi Hair Edwar, Raden M. Evi Aprianti Farauk Maricar Farouk Maricar Hatta, Mukhan P. Ildha Dwi Puspita Kato, Muh Alvin Achmad Leda, Alexander Lopa, Rita Tahir Maricar, Farouk Muh Arsyad Thaha Muh Saleh Pallu Muhammad Farid Maricar Muhammad Saleh Pallu Muhammad Syafaat S. Kuba Mukhsan Hatta Mukhsan Putra Hatta, Mukhsan Putra Mustamin, Muhammad Rifaldi Mustari, Andi Subhan Nenny Karim Pallu, Muhammad S. R Rusmawati 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 Zulmi, Ahmad Syafi'i