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Borneo Engineering: Jurnal Teknik Sipil
Published by Universitas Borneo Tarakan
ISSN : 25811134     EISSN : 26857553     DOI : https://doi.org/10.35334/be.v9i3
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
Focus and Scope Borneo Engineering : Structural Engineering, Transportation Engineering, Water Resources, Geotechnical Engineering and Construction Management
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 243 Documents
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Impact of Discharge Fluctuations on River Morphological Changes: A Case Study of the Palu River Sri Warliawati; Darwin Lion; Andi Rusdin; Zeffitni
Borneo Engineering: Jurnal Teknik Sipil Volume 10 Nomor 1 Tahun 2026
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v10i1.628

Abstract

The Palu River is one of the major rivers in Central Sulawesi that has experienced significant morphological changes due to discharge fluctuations and sediment transport dynamics, particularly in the Kalukubula segment. These morphological changes directly reduce channel conveyance capacity and increase flood risk. This study aims to analyze sediment transport capacity and riverbed elevation changes induced by flow discharge fluctuations, as well as to evaluate the agreement between simulation results and actual field conditions. The research employs a quantitative approach based on one-dimensional numerical modeling using the HEC-RAS software. The data used include river topography surveyed in 2015 as the initial condition, bed sediment characteristics, and river discharge data from 2002–2007. Simulations were performed using the steady flow and sediment transport modules of HEC-RAS to predict riverbed changes for the period 2015–2018, and the results were validated using field measurements conducted in 2018. The simulation results indicate riverbed degradation of 0.08 m at SP.414 and 0.12 m at SP.257, while a relatively minor elevation change of 0.003 m was observed at SP.193. In contrast, field measurements show more pronounced scouring at SP.414 (0.38 m) and SP.257 (0.48 m), as well as sediment deposition of 0.56 m at SP.193. Validation using the Root Mean Square Error (RMSE) method indicates that the HEC-RAS simulation results exhibit a reasonably good level of agreement with field observations, particularly under average discharge conditions. This study demonstrates that flow discharge fluctuations play a critical role in controlling morphological changes in the Palu River, and that HEC-RAS modeling can serve as an effective supporting tool for sediment management and flood risk mitigation.
Fault Structure Analysis Using GGMPlus Satellite Gravity Data in Sumenep Regency, East Java for Disaster Mitigation Azhalia, Neila Ayuzita; Sutasoma, Muwardi; Susilo, Adi; Idmi, Mohammad Habibiy; Wijayanti, Rosita; Boimau, Yanti
Borneo Engineering: Jurnal Teknik Sipil Volume 10 Nomor 1 Tahun 2026
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v10i1.633

Abstract

Sumenep Regency is an area that has experienced earthquakes with fatalities caused by activity along the Rembang, Madura, Kangean, and Sakala (RMKS) faults. This study aims to identify subsurface structures, particularly faults, in the  Sumenep region using satellite gravity image data downloaded from GGMPlus.   The gravity acceleration data obtained were processed into Complete Bouguer Anomalies (CBAs) and separated into regional and residual anomalies using a Butterworth filter. Then, First Horizontal Derivative (FHD) and Second Vertical Derivative (SVD) analyses were performed to clarify the anomaly boundaries and subsurface structures. Next, 2D geological modeling was performed on the residual anomaly data to determine the types and boundaries between subsurface formation layers.  The results of the study showed significant variations in gravity anomalies, with high contrasts in the southwest and southeast areas, indicating differences in the density of subsurface rocks. FHD and SVD analyses successfully delineated suspected faults, especially in areas with contact layers between low-and high-density rocks. The 2D modeling showed that the contact layer between the Ngrayong-Tawun  Formation and the Ngrayong-Bulu Formation has a weak bond, making it more vulnerable to triggers such as earthquakes.  These results emphasize the importance of further study and disaster mitigation related to active faults in the region. For future research, it is necessary to conduct field surveys and integrate them with other geophysical methods to improve the accuracy of the results.
Feasibility Study of Biomass Fly Ash as a Partial Cement Replacement in Mortar Cured in Seawater Patah, Dahlia; Dasar, Amry; Okviyani, Nur; Apriansyah, Apriansyah; Noor, Nurazuwa Md
Borneo Engineering: Jurnal Teknik Sipil Volume 10 Nomor 1 Tahun 2026
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v10i1.717

Abstract

The high consumption of cement and the limited utilization of biomass combustion residues have highlighted the need for the development of more sustainable cement materials, particularly for construction in coastal areas. While biomass fly ash (BFA) has potential as a cement replacement material, information regarding the use of raw BFA, without pretreatment, in mortar cured in seawater remains limited. This study aims to evaluate the technical feasibility of BFA as a partial cement replacement in mortar, based on compressive strength, ultrasonic pulse velocity (UPV), water absorption, and strength activity index (SAI). BFA was used to replace cement at levels of 10%, 20%, and 30% by weight. Mortar mixtures were prepared with a water-to-cement ratio of 0.40, using tap water for mixing and seawater as the curing medium. Compressive strength was tested at 7, 28, and 91 days, while UPV and water absorption were tested at 28 and 91 days. The SAI values were calculated from the compressive strength results to assess the effectiveness of BFA as a cement replacement material. The results indicated that mortar performance was significantly influenced by the BFA substitution level. The mixture with 10% BFA exhibited the best performance, achieving a compressive strength of 32.62 MPa at 91 days, a UPV value of 3434 m/s, and water absorption of 4.80%. The mixture with 20% BFA still showed reasonably good performance, whereas the 30% BFA mixture led to a noticeable deterioration in mortar quality. The SAI results confirmed that 10% replacement was the most effective level. These findings indicate that raw BFA can be directly utilized as a partial cement replacement in mortar cured in seawater.

Page 25 of 25 | Total Record : 243

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