Identification of spatial potential flood-prone area using topographic wetness index under the digital elevation model of Kr. Keureuto watershed, North Aceh.Rizalihadi, Maimun; Meilianda, Ella; Yulianur, Alfiansyah; Away, Yuwaldi
doi: 10.1088/1742-6596/2916/1/012009pmid: N/A
Floods are the most frequent disaster events in Lhoksukon, resulting in significant losses and community and environmental damage. Floods are generated by several factors, consisting of hydrometeorological, topographical, geological, soil, and human activities. Topography is a key controlling factor in flood initiation. Topographic analysis for detecting flood susceptibility, especially flood inundation, can be conducted using the TWI. The research aims to identify the potential spatial distribution of flood-prone areas based on TWI and assess the model accuracy using the ROC-AUC method. A case study was conducted in the Kr. Keureuto watershed. of North Aceh. TWI analysis is based on the topography of an area denoted by extracting DEM using GIS to create slope, flow direction, and flow accumulation. Higher TWI values are associated with higher flood susceptibility. The results show that the value of TWI is approximately 1.571-27.147, showing that more than 20% of area are potentially flood inundations with high and very hight rating of flood susceptibility. Furthermore, based on the analysis using field observation flood is obtained the AUC value of 71,60%. It can be concluded that the spatial model of flood-prone using TWI is good and effective for determining flood prone region in the Kr. Keureuto River basin
Study of the Impact of Climate Change on Rob Floods in Lhokseumawe CityHafli, T Mudi; Mukhlis, ; Fasdarsyah, ; Malasyi, Syibral; Sarana, David; Akbar, Soni Mulia
doi: 10.1088/1742-6596/2916/1/012004pmid: N/A
Lhokseumawe City, one of the cities in Aceh, is situated close to a body of water with an area of 181.06 km2. Being in a coastal area, the city is highly susceptible to tidal flooding. The worst tidal flood in the area occurred on 26 May 2021, causing significant damage to residential areas. This study focuses on assessing the impact of sea level rise on the extent of tidal flood inundation and its consequences for residential areas along the coast of Lhokseumawe City. The analysis utilizes numerical modeling simulation carried out with the Delft3D application, specifically Delft3D-FLOW and Delft3D-WAVE. Data is input at several stages to model the inundation, resulting in the production of images, graphs, and animations. Three scenarios are considered for the inundation modeling: existing tidal flood conditions, a 25-year scenario, and a 50-year scenario. The simulation revealed extensive inundation under all scenarios, with the existing conditions covering 402,174 m2, the 25-year scenario covering 579,860 m2, and the 50-year scenario covering 737,188 m2 in the coastal area of Lhokseumawe City. Tidal floods, caused by extreme tidal waves, resulted in the flooding of numerous buildings along the city’s coast due to their high population density. The expanding inundation area poses a significant threat to the economy, especially to those whose livelihoods depend on the tourism sector. Serious measures are imperative to mitigate the expansion of the inundation area and its adverse economic impacts.
Soil Nailing Application for Railways Track Safety on Slope AreaPinuji, Ismoyo; Dewi, Puspita; Puspitasari, Armyta; Widiastuti, Septiana
doi: 10.1088/1742-6596/2916/1/012015pmid: N/A
Railways track at KM 25+100 - KM 25+200 from Jember to Banyuwangi is constructed next to slope area with inclination angle 69°. As railways track mapping report, this area is categorized as a high-potential landslide area that can harm train travel. By using soil nailing method with threaded steel and embedded into the soil for grouting, slope stabilization be improved. Undisturbed soil sampling on 1.5 m depth was carried out and tested to determine soil parameters. Based on the USCS soil classification, the soil at the site is an organic clay with high plasticity. Soil parameters are used to calculate the slope safety factor before and after soil nailing application with the best reinforcement design. By utilizing Plaxis 2D CE V20 Bentley software and manual calculations with the bishop method for comparison, the potential landslide before reinforcement resulted a safety factor value of 1.198 by using Plaxis and 0.97 by calculated manually. Some soil nailing reinforcement planning design is obtained and resulted that soil nailing design with diameter 29 mm, slope angle application on 20° with distance between nail bar at 1m, and nail length 9m have best safety factor value at 1.548. With the best design and >1.5 SF value, the soil nailing design is safe against landslides risk.
Normalization of Suak Ujong Kalak estuary as a flood reduction effort for Meulaboh citySafriani, Meylis; Hasdanita, Fitry; Salena, Inseun Yuri; Ferenindi,
doi: 10.1088/1742-6596/2916/1/012007pmid: N/A
Meulaboh City frequently experiences flooding, with runoff flowing into the Suak Ujong Kalak Estuary, a natural outlet for the city’s drainage system. Currently, the estuary is unable to effectively accommodate the runoff, exacerbating the flood risk. This study aims to evaluate the existing condition of the Suak Ujong Kalak Estuary and propose a normalization plan to improve flood control. The research employs a descriptive-quantitative methodology, involving field surveys, data collection, and hydrological and hydraulic analyses. The hydrological analysis includes rainfall frequency analysis, chi-square testing, and rainfall intensity calculation using the Mononobe method. Flood discharge estimation is based on the Rational method for a 25-year return period. Hydraulic analysis is conducted using HEC-RAS 6.3.1 software. The results show that the estuary receives an inflow of 79.33 m3/second, which exceeds its current capacity. Hydraulic analysis reveals that the estuary cannot accommodate the discharge, causing overflow with an average height of 0.6 meters and a storage capacity of 40,798.43 m3. To address this, the study recommends a normalization effort, involving excavation with an average depth of 1 meter, to improve the estuary’s capacity and reduce flooding in Meulaboh City.
Calibration of base saturation flow rate at pretimed signal intersection utilizing Bayesian linear regression considering morning and evening peak hour observationsLulusi, L.; Sugiarto, S; Saleh, S M; Isya, M
doi: 10.1088/1742-6596/2916/1/012031pmid: N/A
Base saturation flow is a critical constraint used for evaluating the capacity of signalized intersections. The Indonesian Highway Capacity Manual (IHCM, 2023) is frequently used for signalized intersection planning in Indonesia. In heterogeneous traffic environments, the driver characteristics and behaviors exhibit significant variations. However, the base saturation flow was also influenced by traffic volume during the observation period. This study modeled the base saturation flow by analyzing differences in morning and afternoon peak hour data. The objective was to examine the base saturation flow at pretimed signal in Banda Aceh, with a focus on traffic volume fluctuations during peak hours. Four intersections were investigated in this study. Unmanned aerial vehicles were employed to record discharge flow pattern within targeted signalized intersection. Manual timing was conducted using stopwatches and geometric road data were collected through direct field measurements. Bayesian linear regression with a Gibbs sampling approach was utilized to recalibrate the saturation flow rate coefficients. The base saturation flow during the morning peak is 284 We, while in the afternoon peak, it is 285 We, with We representing the effective intersection approach.
The Effect of Using Ureolytic Bacteria as Self-Healing Agent in Concrete on Workability, Density and AbsorptionNasytha, Amathalia Laiyina; Aulia, Teuku Budi; Idris, Yunita
doi: 10.1088/1742-6596/2916/1/012025pmid: N/A
Concrete is one of the fastest growing construction materials in Indonesia. Concrete has a low tensile strength that causes concrete to crack easily. One way to overcome this is by using self-healing concrete. This concrete is able to repair small cracks. Ureolytic bacteria can be used as a medium in self-healing concrete. These bacteria undergo a CaCO3 precipitation process to produce calcite which later fills the cracks in the concrete. This research aims to determine the effect of the application of ureolytic bacteria on the workability, density, and absorption of high-strength concrete. Additionally, the study investigates the elemental composition of self-healing concrete using Bacillus sp., Solibacillus sp., and Staphylococcus sp. as the healing medium. In the study, the test specimens used were cubes measuring 5 cm × 5 cm × 5 cm. The tests carried out in this study were testing the workability, density, and absorption of concrete. In this study, ureolytic bacteria Bacillus sp., Solibacillus sp., and Staphylococcus sp. were used with variations of 0%, 0.5%, 0.6% and 0.7% by weight of fine aggregate. The lowest flow reduction value is found in the addition of Bacillus sp. 0.5% bacteria with a value of 2%. The decrease in density value in self-healing concrete is not too significant. The lowest decrease was found in concrete with the addition of Staphylococcus sp. 0.5% bacteria with a value of 0.3%. The lowest absorption value is found in the specimen without the addition of bacterial capsules, which is 2.44%. Energy dispersive X-ray spectroscopy (EDS) test results on ureolytic bacterial self-healing concrete show that there are elements of C, O, Mg, Al, Si, S, and Ca in this concrete.
Mitigating Drying Shrinkage in High-Strength Concrete Using Glass and Polypropylene Fibers with Diatomaceous Earth as Cement SubstituteZaki, Hilma Nuraisyah; Hasan, Muttaqin; Saidi, Taufiq
doi: 10.1088/1742-6596/2916/1/012001pmid: N/A
In recent decades, the demand for high-strength concrete has surged due to its enhanced workability and durability. However, the high cement content in such concrete impacts its hardening properties, particularly causing drying shrinkage strain, which affects structural performance and durability. Adding fibers like glass and polypropylene can mitigate this drying shrinkage by improving tensile and flexural strength, ductility, and crack control. High cement content also raises environmental concerns, including increased CO2 emissions. Diatomaceous earth, an eco-friendly and cost-effective cement substitute, can address these issues. This study explores the effects of glass and polypropylene fibers on concrete drying shrinkage and the impact of diatomaceous earth. Concrete specimens (100 mm × 100 mm × 400 mm) with 0% and 10% diatomaceous earth and varying fiber contents (0%, 0.2%, 0.4%, 0.8%, 1%) were tested. Drying shrinkage data over 60 days were recorded using dial gauges. Results indicate that both types of fibers effectively reduce drying shrinkage, with glass fibers being more effective. Additionally, the usage of 10% diatomaceous earth also reduces drying shrinkage. A modified B4-Bazant model incorporating coefficients for diatomaceous earth (Kd), fiber type (Kf), and fiber volume (Kvf) was developed. Further research with different fiber proportions is recommended for more accurate modeling.
Peer Review Statementdoi: 10.1088/1742-6596/2916/1/011002pmid: N/A
All papers published in this volume have been reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.• Type of peer review: Single Anonymous• Conference submission management system: Morressier• Number of submissions received: 90• Number of submissions sent for review: 64• Number of submissions accepted: 31• Acceptance Rate (Submissions Accepted / Submissions Received × 100): 34.4• Average number of reviews per paper: 2• Total number of reviewers involved: 37• Contact person for queries:Name: Reza Pahlevi MunirwanEmail: [email protected]: Universitas Syiah Kuala
Seismic performance of CBF’s single steel angle brace under several variable amplitude loadingsPanjaitan, Arief; Hasibuan, Purwandy; Putra, Rudiansyah; Afifuddin, Mochammad; Haiqal, Muhammad
doi: 10.1088/1742-6596/2916/1/012003pmid: N/A
Constructing seismic seismic-resistant structures is essential to be carried out in earthquake-hazard areas. A concentrically Braced Frame System (CBF) is an earthquake-resistant structure that relies on its brace to withstand seismic loading. Seismic loading is a series of loading histories composed of high (HA) and low-amplitude (LA) loading. When this loading hits the CBF system, it will perform various values of displacement. So far, many studies have been conducted to reveal seismic performance in CBF. However, studies on CBF’s response due to the variable displacement amplitude as the representation of the earthquake is still limited. This present study observed the seismic performance, i.e., strength, stiffness, and dissipated energy, of the CBF’s brace due to the variable amplitude loading. Variable amplitude loading is the loading history composed of high and low displacement amplitude levels. The brace was made of a single steel angle, L 40.40.4, and loaded with three different variable amplitude loading. Observing the dissipated energy as the main seismic performance of CBF discloses that the specimen which is loaded by the smaller number of cycles in a block amplitude reached the highest cumulative dissipated energy in the same applied displacement. This tendency is supposed to be presented since the specimen under a smaller number of loading repetitions in a block, leads to experiencing a small effect of fatigue and increases the strength in each cycle. Confirming the failure mode disclosed that all braces presented flexural and torsional buckling.
Physical properties and compression index of embankment soil as construction materialSundary, Devi; Munirwansyah, ; Azmeri, ; Yunita, Halida
doi: 10.1088/1742-6596/2916/1/012027pmid: N/A
Soil’s physical properties are characterized by its shape, size, color, and odor. The compression index, a key parameter of soil compressibility, is used to determine the extent of consolidation settlement. This study serves as preliminary research into alternative embankment materials for construction. The embankment soil samples were collected from ten locations in Aceh Besar district. The research aims to assess the quality of embankment soils and predict potential land subsidence, contributing to sustainable development in Aceh Province. This is particularly important because the fill soils in this area are crucial as the primary source for various development projects in Aceh Besar and Banda Aceh. The results indicate that clayey soils require careful consideration as construction materials due to their higher potential for subsidence. Conversely, silty sand or clayey soils are more suitable for construction because of their lower compressibility.