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Adi Suryadi
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INDONESIA
Journal of Geoscience, Engineering, Environment, and Technology
Published by Universitas Islam Riau
ISSN : 2503216X     EISSN : 25415794     DOI : 10.25299
Core Subject : Science, Social, Engineering,
Earth & Planetary Sciences Engineering Environmental Science Physics
JGEET (Journal of Geoscience, Engineering, Environment and Technology) published the original research papers or reviews about the earth and planetary science, engineering, environment, and development of Technology related to geoscience. The objective of this journal is to disseminate the results of research and scientific studies which contribute to the understanding, development theories, and concepts of science and its application to the earth science or geoscience field. Terms of publishing the manuscript were never published or not being filed in other journals, manuscripts originating from local and International. JGEET (Journal of Geoscience, Engineering, Environment and Technology) managed by the Department of Geological Engineering, Faculty of Engineering, Universitas Islam Riau.
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Articles 673 Documents
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Optimization of Bench Width and Vertical Bench Position for Claystone Slopes Using the Limit Equilibrium Method under a Safety Factor Constraint Putra, Kyrie Eleison; Aditya, Fariz; Heriyadi, Bambang; Anarta, Rudy
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.02.28001

Abstract

One important aspect of open pit mine planning is slope geometry design, which affects the stability of the slope and the efficiency of overburden removal. This study aims to investigate the influence of vertical bench position and bench width on slope stability and their effect on stripping volume. The limit equilibrium method was used for slope stability analysis, with the assistance of Rocscience Slide2 software. The stripping volume estimate was obtained from pit shell simulations using GEOVIA Surpac software. The vertical bench positions analyzed were ¼, ½, and ¾ of the total slope height, which was 60 m. The bench width variations tested were 0, 5, 10, 15, 20, and 25 m, while maintaining a minimum safety factor requirement of 1,3. The analysis indicated that the optimal configuration is achieved by placing the bench at the vertical position of ½ of the overall slope height with a bench width of 10 m, which results in an overall slope angle of 44°. The result is steeper than the no-bench scenario, with an overall slope angle of 42°. This geometry produces an estimated overburden volume of 195,123,000 m3, which is smaller than the no-bench scenario of 196,559,500 m3. Therefore, the reduction in stripping volume is 1,436,500 m3 or approximately 0.73%. This study shows that optimizing the bench configuration enables the implementation of steeper overall slope angles while reducing the required stripping volume in open pit mine planning.
Influence of weathering on the mechanical strength and factor of safety of andesitic rocks in the Gunung Geulis area, Jatinangor, West Java, Indonesia Shah, Bilal; Muslim, Dicky; Sophian, Raden Irvan
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.02.25868

Abstract

Weathering gradually alters the physical character and engineering performance of volcanic rocks, including andesite, which is commonly found and frequently used for construction and slope-related works within the Gunung Geulis region of Sumedang Regency, Indonesia. To examine how these changes affect mechanical behavior, this study compared the estimated uniaxial compressive strength (UCS) and the resulting factor of safety (FOS) of andesite across different weathering grades. Seventy-eight samples were collected from three geological segments, representing slightly to moderately weathered (Grade II–III) and highly weathered (Grade IV). Point Load Tests (PLT) were performed on all samples, and the resulting indices were converted to estimated UCS values using an empirical correlation. Statistical analyses, including descriptive analysis, the Mann–Whitney test, and two-factor analysis, were performed to assess strength differences between weathering grades and geological segments. These estimated UCS values were then converted into shear-strength parameters through the Generalized Hoek–Brown approach, and the corresponding cohesion and internal friction angle were obtained using RocLab 1.0 software for slope-stability modelling in Slide2. The results show a consistent and marked decline in strength as weathering progresses; overall, the estimated UCS decreases by 59.22% across all investigated segments, demonstrating that increasing weathering reduces the rock strength by more than half. This reduction in rock-mass strength is reflected in the slope-stability analyses, where slopes composed of SW–MW andesite produced FOS values ranging from 3.518 to 4.271, indicating relatively stable slope conditions, whereas HW andesite yielded lower FOS values ranging from 1.191 to 1.307, representing comparatively lower and marginally stable conditions. These findings demonstrate that progressive weathering significantly reduces the mechanical performance and slope stability of andesitic rock in the Gunung Geulis area.
Analysis of Subsurface Hardness during the Wet and Dry Seasons in the Rice Fields of Semarang Village, Bengkulu City, Using the MASW Seismic Method Muhammad Arief Dermawansyah Nusan; Lubis, Ashar Muda; Elfi Yuliza
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.02.26721

Abstract

The mechanical properties of soil in agricultural land are greatly influenced by seasonal changes, which can affect productivity and food security. This study aims to analyze the effects of wet and dry seasons on the mechanical properties of subsoil in the rice fields of Semarang Village, Bengkulu City, and their implications for land management that supports food security. The method used was Multichannel Analysis of Surface Waves (MASW) with data acquisition at 24 points using 24 geophones (2 m spacing, 5 m offset). The data was then processed using WinMASW Professional 5.0 software to obtain a 2D model of shear wave velocity (Vs) and Poisson's Ratio to a depth of 30 m. The results showed that during the wet season, the soil was dominated by low Vs values (< 350 m/s) and high Poisson's Ratios (0.4 0.45), indicating saturated and soft conditions. Conversely, during the dry season, Vs values increased (600–1200 m/s) with lower Poisson Ratios (0.35–0.4), indicating a denser and stiffer subsurface medium. These findings confirm that seasonal variations in water content greatly affect the mechanical properties of the soil. Therefore, MASW-based analysis can be used as a basis for planning adaptive water and agricultural land management to support food security in tropical climates.
Effect of Sand Pretreatment on Bio-Stabilization Using Rhizopus oligosporus Zhafirah, Athaya; Fauziah, Fitria Nurhaliza; Febrijanto, Rudy; Yogaswara, Dendi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.02.27475

Abstract

Ottawa sand is a type of sand widely used in geotechnical research for its uniformity and high silica content. However, Ottawa sand is classified as a non-cohesive soil, lacking intergranular bonds, resulting in low shear strength. Therefore, a soil improvement method that enhances the material's mechanical stability is needed. This study aims to analyze the effect of Ottawa sand pretreatment on increasing soil shear strength through a bio-stabilization method using the fungus Rhizopus oligosporus. The research method used is a laboratory experimental method with an unconfined compression test. Ottawa sand samples were divided into three treatments: normal treatment (S-0), washed sand treatment (S-1), and washed and oven-dried treatment (S-2). Each sample was mixed with tempeh yeast containing Rhizopus oligosporus and distilled water, each at 5% of the sand weight. The curing process was conducted in a closed container, with temperature, humidity, and mycelium development monitored during incubation. The results showed that sand pretreatment increased the soil's unconfined compressive strength. The samples treated with washing and oven drying (S-2) had the highest unconfined compressive strength of 9.72 kPa and shear strength of 4.86 kPa at 12 days of curing. Meanwhile, the samples without pretreatment showed lower unconfined compressive strengths. Visually observed mycelial growth showed a more even distribution in the samples with sand pretreatment. The results of this study indicate that bio-stabilization using Rhizopus oligosporus has the potential to be a more environmentally friendly soil-improvement method for increasing the stability of sandy soil.
A Preliminary Assessment of the Reliability of a Personal Weather Station for Urban Flood Monitoring in a Tropical Coastal Urban Area: A Case Study from Kendari, Indonesia Maheng, Dikman; Bila, Salsa Cinta; Wundari, Windy; Bachrun, Ratna; Baskara, Surya; Adriati , Yolly; Nazeer, Aftab; Radhakrishnan, Mohanasundar
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.02.28140

Abstract

This study conducted a preliminary assessment of the PWS reliability compared to the official BMKG reference station in a tropial coastal urban area of Kendari, Indonesia, particularly for urban flood monitoring. Daily rainfall obtained from the PWS and the BMKG station were compared over February to December 2024, using rainy days where both stations recorded rainfall exceeding 10 mm on the same day. For statistical tests, there were statistical metrics implemented in this study including Pearson correlation (r), coefficient of determination (R²), mean bias error (MBE), percent bias (PBIAS), mean absolute error (MAE), and root mean square error (RMSE). The rainfall data was also compared to flood-confirmed dates. The rainfall data analysis showed that there was moderate agreement between the PWS and the BMKG (r = 0.66, R² = 0.40, MBE = 1.83 mm, PBIAS = 4.91%, MAE = 17.12 mm, RMSE = 23.87 mm). Moreover, the PWS recorded the same rainfall category as BMKG on three flood events, particularly for heavy and very heavy rainfall category. However, the PWS showed moderate rainfall category for two flood events when the BMKG recorded heavy rainfall category. This difference could be attributed to climate background of Kendari and the device environment settings. Moreover, it is suggested that the PWS can be a useful tool for urban flood monitoring, especially during large and spatially widespread rainfall events.
Front matter JGEET Vol 11 No 02 2026 Adi Suryadi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

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Abstract

Back matter JGEET Vol 11 No 02 2026 Adi Suryadi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

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Abstract

Geodiversity on the Great Sumatran Fault on Sungai Penuh Aspiring for the Geopark Designation, Jambi, Indonesia Utama, Hari Wiki; Heriberta, Heriberta; Adriadi, Ade; Emilia
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 3 (2025): JGEET Vol 10 No 03 : September (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.3.16610

Abstract

Sungai Penuh is a municipality in Jambi Province which is located in the westernmost part of the administrative region. Naturally, this region has natural beauty as a tourist attraction, where landscape on the Great Sumatran Fault in the Barisan Ranges Zone. The existence of faults plays an important role as the main actor that causes deformation of rocks and natural landscapes, so that it can produce geodiversity. Thus, conditions like this can be used as an important role in the presence of geodiversity for the identification of sustainable geotourism development. The aim of this study is to provide the latest information regarding the existence of the geodiversity in the Great Sumatran Fault for aspiring geopark designation. Research methods for conducting geodiversity features of lithology, stratigraphy, geological structure, and landscape. Then, qualitative assessment of geodiversity includes of education, scientific, and tourism of geodiversity site. Stratigraphically in the research area is composed of pyroclastic Bandan, Sheared Basalt, Sungai Penuh Granodiorite, pyroclastic Pengasih, andesitic lava and volcanic breccia of Mt. Lumut, andesitic lava and volcanic breccia of Mt. Tarasih, andesitic lava and volcanic breccia of Mt. Talang, andesitic lava and volcanic breccia of Mt. Kebongsong, andesitic to basaltic lava and volcanic breccia of Mt. Raya. It has geodiversity that can be used as a geotourism site such as Peak Depati VII Coffee, Dissected Mountains Granitoid Sungai Penuh, Ancient Lake Kerinci, Khayangan Volcanic Plateu, Sungai Penuh Cold Spring, Lake Volcano-tectonic Kerinci. These conditions provide demands for the geotourism loving community to preserve geological heritage in the concept of geological conservation to be proposed as a geological site in the geotourism aspect. So that this role can later have a positive impact on the local community around geotourism objects based on sustainable geotourism development aspiring geopark designation.
Performance Comparison of Isolation Forest and COPOD Algorithms for Anomaly Detection in Electrical Submersible Pumps Asmara, Hygiano Paksi Widya; Maharsi, Dara Ayuda; Rachmanto, Rian
Journal of Geoscience, Engineering, Environment, and Technology Special Issue from The 2nd International Conference on Upstream Energy Technology and Digitalization
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.1.1.23849

Abstract

The Electrical Submersible Pump (ESP) is a crucial technology in enhancing oil production, yet its performance can be compromised by anomalies that lead to operational disruptions and financial losses. Early detection of these anomalies is vital for minimizing risks and optimizing ESP lifespan. This study compares the performance of two machine learning algorithms—Isolation Forest and Copula-Based Outlier Detection (COPOD)—in identifying anomalies in ESP operational data. The study uses both long-term historical data and short-term period data from a well in Field X, focusing on key operational parameters such as amperes, frequency, voltage, discharge pressure, motor temperature, vibration, and gross rate. The results indicate that Isolation Forest outperforms COPOD in detecting anomalies, particularly in the presence of missing data. Short-term data detection yields clearer correlations between anomalies in different features, highlighting its advantage over long-term historical data. The findings underscore the importance of utilizing short-term operational data and demonstrate how anomaly detection algorithms can enhance ESP monitoring for improved performance and cost-efficiency.
Identification Comparison of Landslide Potential Area with Analytical Hierarchy Process and Logistic Regression Methods in Cisarua District and Surroundings, Bogor Regency, West Java Pratama, Agun Romdha Sastra; Misbahudin
Journal of Geoscience, Engineering, Environment, and Technology Special Issue from The 2nd International Conference on Upstream Energy Technology and Digitalization
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.1.1.24031

Abstract

Landslide is one of the geological disasters that often occur in Indonesia, especially in Cisarua District and its surroundings, Bogor Regency, West Java, so mitigation activities need to be carried out, one of which is by making a map of potential areas of landslide in the research area. This study aims to analyze the spatial distribution of potential landslides in Cisarua District, Bogor Regency, using the Analytical Hierarchy Process (AHP) and Logistic Regression (LR) methods, and to determine the more effective method for landslide prediction in the study area. The results showed that the AHP method obtained the distribution of potential areas of landslide in the low category with an area of 39,592 km2 with a percentage of 38.99%, the moderate category with an area of 39,690 km2 with a percentage of 39.09% and the high category with an area of 22,253 km2 with a percentage of 21.92%. In the LR method, the potential for landslide was obtained in the low category with an area of 39,158 km2 with a percentage of 38,15%, the moderate category with an area of 39,485 km2 with a percentage of 38.86%, and the high category with an area of 22,967 km2 with a percentage of 23% and the best method in determining the potential area of landslide was the LR method with an overall accuracy level of 86.41% compared to the Analytical Hierarchy Process (AHP) method with an overall accuracy of 78.64%.

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