BANDAR: JOURNAL OF CIVIL ENGINEERING

Analysis of Sediment Characteristics and Sedimentation Rate of the Noling River, Luwu Regency

Juliandro Juliandro, Muhammad Syafa'at S Kuba, Farida Gaffar, Ismail Pawara — Tue, 18 Nov 2025 13:45:57 +0800

The Noling River plays an important role in the lives of the surrounding communities; however, it faces sedimentation problems that lead to riverbed aggradation, infrastructure disturbances, and reduced flow capacity. This study aims to determine the sediment characteristics and the rate of sedimentation in the Noling River, Luwu Regency. Sediment samples were collected from the midstream section of the river and analyzed in the laboratory to determine grain size distribution, specific gravity, and physical characteristics of the sediment. The results show that the Noling River sediment is dominated by sand (57.4%), gravel (31.8%), and silt/clay (10.9%), with a sediment classification of sandy clay. The sedimentation rate was calculated using both direct measurement and empirical approaches (Meyer-Peter and Duboys methods). The average suspended sediment load was found to be 5,251.97 tons/month, while the bed load reached 1,102.91 tons/month. The flow velocity, which exceeds the sediment fall velocity, indicates that sediment transport occurs actively. The findings of this study are expected to serve as a reference for better river management and future sedimentation mitigation efforts.

Analysis of Road Damage and Its Improvement on The South Ring Road of Jambi City

Tendy Laksana Laksana, Melawaty Agustien, Edi Kadarsa — Tue, 18 Nov 2025 13:47:30 +0800

Analysis of Road Damage and Improvement on the South Ring Road and West Ring Road of Jambi City. Road damage is an event that causes a road pavement to become inconsistent with its original shape. This study, in addition to assessing road conditions in Jambi Province, primarily analyzes the differences between the PCI Method, the Bina Marga Method, and the Asphalt Institute Method. The three methods will be compared by how they are used to determine the condition of the road pavement for the same road section. Then, the calculation process and results will be analyzed to determine which method is easier in conducting surveys and calculations, while other methods are relatively more difficult when applied to the research location. Based on the analysis results on the South Ring Road and West Ring Road sections of Jambi City using the Bina Marga Method, the PCI (Pavement Condition Index) Method, and the Asphalt Institute Method have relatively similar assessments in terms of handling. For handling road damage on the South Ring Road and West Ring Road sections of Jambi City, the PCI (Pavement Condition Index) Method and the Asphalt Institute Method are used in their handling.

Kerusakan jalan merupakan kejadian yang mengakibatkan suatu perkerasan jalan menjadi tidak sesuai dengan bentuk perkerasan aslinya. Penelitian ini selain menilai kondisi jalan di Provinsi Jambi, utamanya adalah untuk menganalisis perbedaan dari Metode PCI, Metode Bina Marga, Metode Asphalt Institute. Ketiga metode akan dibandingkan dengan cara dipergunakan untuk menentukan kondisi perkerasan jalan untuk ruas jalan yang sama. Kemudian akan dianalisis proses perhitungan dan hasil sehingga metode apa yang lebih mudah dalam pelaksanaan survei dan perhitungan, sementara metode lain relatif lebih sulit jika diterapkan pada lokasi penelitian. Berdasarkan hasil analisis pada ruas Jalan Lingkar Selatan dan Jalan Lingkar Barat Kota Jambi menggunakan Metode Bina Marga, Metode PCI (Pavement Condition Index), Metode Asphalt Institute memiliki penilaian yang relatif hampir sama dalam penanganan. Untuk penanganan kerusakan jalan pada ruas Jalan Lingkar Selatan dan Jalan Lingkar Barat Kota Jambi menggunakan Metode PCI (Pavement Condition Index) dan Metode Asphalt Institute dalam penanganannya.

Study of Jetty Planning as Coastal Protection Structure to Address Estuary Sedimentation: Case Study of Lubuk Tukko Beach, North Sumatra Province

Tue, 18 Nov 2025 13:50:10 +0800

Sediment transport from the sea can cause estuary siltation. The effective jetty construction planning is one of problem addressing structurely. To derive the elevation and dimensions of an effective jetty structure in addressing the estuary sedimentation at Lubuk Tukko Beach, North Sumatra Province, wave analysis is conducted using the hindcasting method and tidal analysis using the admiralty method. The research analysis show that the wave height design is 0.676 meters and the highest water surface elevation is 0.616 meters. The type of jetty used is a long jetty with a left jetty length of 394 meters and a right jetty length of 426 meters. The elevation of the right jetty end is 2.5 meters, with a building top width of 1 meter, and the elevation of the left jetty end is 2.6 meters, with a top width structure of 1 meter.

The Distribution Pattern of Coffee Shop Public Spaces Based on Geographic Information System (GIS) in Majene Urban Area

Tue, 18 Nov 2025 13:50:51 +0800

The phenomenon of urban transformation in Majene through the development of coffee shop public spaces shows significant changes in the social, economic, and physical spatial structure of small cities in Indonesia. This study aims to : (1) identify the characteristics of coffee shops public spaces in Majene Urban Area, (2) analyze the distribution pattern of coffee shops public spaces in Majene Urban Area based on GIS. Methods used are quantitative descriptives statistics and GIS spatial analysis, namely buffer and Avarage Nearest Neighbor (ANN). The results of the study shows: (1) the characteristics of coffee shops public spaces is devided by two charachteristics: coffee shop and café, consist of 44 coffee shops and cafes in Majene Urban Area, spread across Banggae District and East Banggae District. East Banggae District in the area with the highest concentration of coffee shops 26 units and cafes 10 units. In Banggae District 6 unit coffee shop and 2 unit café, (2) the spatial distribution pattern of coffee shops public spaces is clustered with an ANN ratio of 0.655567 with an avarage real distance (observed mean distance) of 217.98 meters while the avarage expected distance (expected mean dstance) is 332.52 meters. The phenomenon of proxmity of one location to another is also supported by further statistcal results, namely a z-score value and p-value of -4.517352 and p-value of 0.000006. the highly negative z-score value and p-value far below the 0.05 threshold indicate high spatial significance and indicate that the distribution of coffee shops and cafes in Majene Urban Area is clustered and doesn’t randomly.

Analysis of Factors Affecting Driving Safety at PT. Cakraindo Mitra International

Irpan Numang — Tue, 18 Nov 2025 13:51:13 +0800

This study aims to analyze the effect of safety briefings, work experience, and work breaks on driving safety among truck drivers at PT Cakraindo Mitra Internasional. The background of this study stems from the high number of traffic accidents at the company from January to April 2025, most of which were caused by driver negligence. This study uses a quantitative method with a cross-sectional approach. The research sample consisted of 43 respondents selected using purposive sampling techniques according to the minimum criteria of two trips. Data were collected through a questionnaire based on a 1–5 Likert scale, then analyzed using the Partial Least Square – Structural Equation Modeling (PLS-SEM) method. The results showed that safety briefings, work experience, and work breaks had a positive and significant effect on driving safety, both partially and simultaneously. These findings indicate that regular safety briefings, adequate work experience, and good quality rest can improve safe driving behavior. This study recommends that companies consistently strengthen their safety briefing programs, effectively manage drivers' work and rest schedules, and utilize work experience as a resource for safety training

Numerical Investigation of Soft Ground Improvement beneath Road Embankments Using Prefabricated Vertical Drains: Insights from PLAXIS 2D Modeling

Thu, 20 Nov 2025 11:49:19 +0800

Abstract

Soft clay deposits often cause excessive settlement and instability in road embankments. This study investigates ground improvement using prefabricated vertical drains under staged embankment loading through finite element modeling in PLAXIS 2D. The analysis examines consolidation rate, settlement, pore water pressure dissipation, and safety performance for square and triangular drain layouts with spacings of 1.25 m and 1.50 m. Results show that vertical drains accelerate consolidation, reducing the time to reach 90 percent settlement from 8.3 years to less than 3 years, while improving overall embankment stability. The triangular 1.25 m configuration produced the most uniform deformation and fastest consolidation response. The study confirms that optimized drain geometry significantly enhances soft ground performance and provides a practical numerical framework for design applications in tropical regions.

Insurgent Planning Practices in Indonesia’s Development Planning

Nanda Mutiara Zani, Azizah Putri Abdi, Jafar Mukhlis — Wed, 26 Nov 2025 00:00:00 +0800

Insurgent planning represents a strand of planning theory that transcends political boundaries, challenges societal oppression, and envisions alternative urban futures. This study explores the concept and practices of insurgent planning in Indonesia through a descriptive qualitative method with a comparative approach, focusing on three major cities: Yogyakarta, Makassar, and Jakarta. The findings reveal dynamics similar to those in the Global South. In Yogyakarta, the Kalijawi Community, supported by Arkom Jogja, resisted eviction along riverbanks through social network strengthening and alternative housing initiatives. In Makassar, Kampung Pisang residents addressed tenure insecurity with Arkom Makassar via participatory mapping, negotiation, and land-sharing. In Jakarta, post-eviction residents of Kampung Akuarium reclaimed their right to the city through advocacy, litigation, and coalition-building. The study concludes that reclaiming neglected urban assets represents the most prominent form of insurgent planning, emphasising a shift from top-down approaches towards inclusive, participatory, and justice-oriented urban planning

Clean Water Infrastructure Provision Strategy to Support the Industrial Sector in Indramayu Regency in Supporting the Rebana Area

Nur Zahrah Afifah, Azizah Putri Abdi, Fadiah Izzah Ajrina — Wed, 26 Nov 2025 12:41:46 +0800

Clean water infrastructure is essential for supporting the Rebana Industrial Area in Indramayu, where high industrial demand risks conflict with the crucial agricultural sector and exacerbates an existing water crisis. This study aims to develop an integrated strategy to boost water supply and service quality in Indramayu. Using a mixed method approach combining quantitative water balance (demand-supply) and qualitative SWOT analysis the main findings reveal a significant water deficit. The current supply of 79.448 l/sec fails to meet the demand of 157.740,7 l/sec, resulting in a −78.292,7 l/sec deficit in 2025, projected to remain −49.438,1 l/sec by 2045. Adding to the crisis, raw water quality in the two main rivers is classified as moderately to heavily polluted. The main conclusion emphasizes the urgent need for supply interventions. The recommended strategy focuses on two pillars: increasing raw water quantity by utilizing 3.600 l/sec from regional alternative sources and enhancing local reservoir capacity to enforce the groundwater ban, and improving services through the construction of new, high-tech Water Treatment Plants (WTPs) and expanding piping networks. This study provides vital policy recommendations for the local government to ensure sustainable water access and industrial growth in the Rebana Region.

The Effect of the Number of Work Shifts for Erection Box Girder Using Launching Gantry on the Cost and Implementation Time in the Medan-Binjai II Railway Line Project

Ely Mulyati, Dessy Amelia — Fri, 28 Nov 2025 11:24:07 +0800

Resource management strategies in the construction sector play a vital role in achieving cost efficiency and accelerating project execution time. One applicable form of resource management is the implementation of shift work management. In the context of a railway overpass construction project utilizing the erection box girder method with a Launching Gantry and experiencing delays, the configuration of shift schedules becomes a critical variable due to its direct impact on operational costs and project duration. This study was conducted by developing a work schedule for the erection of box girders using Microsoft Project software for two shift work scenarios: a single-shift system and a two-shift system. Subsequent analysis was carried out to evaluate the project duration and calculate the implementation costs for each shift alternative.The analysis results indicate that the implementation of a two-shift work system has a significant impact on time efficiency and cost control. By adopting a two-shift system, the project duration can be accelerated by up to 48 days compared to a single-shift system. In terms of cost, the two-shift system is also able to reduce total project implementation costs by approximately 3.5% compared to the single-shift alternative.