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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 702 Documents
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Geochemical Analysis of Geothermal Manifestations in Buton Island, Southeast Sulawesi, Indonesia Chalik, Citra Aulian; Wakila, Muhammad Hardin; Firdaus, Firdaus; Heriansyah, Andi Fahdli
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.3.25952

Abstract

The geochemical characteristics of non-volcanic geothermal energy in Buton Island are still rarely studied despite its location in an active tectonic zone. This study explores the geochemical features of geothermal manifestations in Buton Island, Indonesia, with the aim of identifying fluid characteristics and predicting subsurface temperatures from geothermal manifestations in the study area. Water samples collected from five manifestation locations were analyzed for major cations (Na⁺, K⁺, Ca²⁺, Mg²⁺) and anions (Cl⁻, SO₄²⁻) using atomic absorption spectrophotometry, HCO₃⁻ concentration through titrimetric analysis, and SiO₂ content through spectrophotometry. The ternary diagram of Cl-SO₄-HCO₃ indicates the type of bicarbonate fluid, while the ternary diagram of Na-K-Mg indicates the characteristics of immature geothermal water in the reservoir. Interpretation is clarified through specific findings in the Gonda Baru and Karede samples that show characteristics of a chloride-bicarbonate mixture type due to the influence of seawater intrusion or intensive rock-water interaction during long residence times in the reservoir. Geothermometers such as Na-K-Ca and K-Mg are used to estimate reservoir temperatures. The estimated reservoir temperature indicates a relatively low-temperature system, ranging from 70°C to 120°C. The implications of identifying this low-temperature system indicate that geothermal resources on Buton Island are ideal for direct use, such as in the agro-system sector (drying agricultural products), tourism/therapeutic hot springs, or small-scale binary cycle power plants. This research provides an important scientific contribution as a basic reference in the strategy for developing non-volcanic renewable energy potential in Eastern Indonesia.
Enhancing CO₂ Storage Safety and Efficiency through Advanced Geomechanical Modeling and Integrated Monitoring Systems Widyatmoko, Amri; Prastio, Eko; Kurniawan, Endang; Sani, Winardi; Panggarbesi, Bobby Hendry; Nambo, Hiroshi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.3.27242

Abstract

Gelologicall-scallel calrbon dioxidel (CO₂) storalgel is al cruciall telchnology for delcalrbonizaltion, but its implelmelntaltion falcels significalnt challlelngels rellalteld to gelomelchalnicall risks alnd long-telrm contalinmelnt salfelty, palrticulalrly in delplelteld hydrocalrbon relselrvoirs such als thosel found Offshorel North Welst Jalval (ONWJ). This relport alnallyzels al proalctivel fralmelwork for elffelctivelly malnalging thelsel risks. Thel celntrall thelsis of this alnallysis is thalt thelsel risks caln bel mitigalteld through thel synelrgistic intelgraltion of aldvalnceld coupleld Thelrmall-Hydralulic-Melchalnicall-Chelmicall (THMC) gelomelchalnicall modelling with al relall-timel intelgralteld monitoring systelm. Thel alnallysis shows thalt thel THMC modell is calpalblel of alccuraltelly preldicting potelntiall falult relalctivaltion, relselrvoir subsidelncel, alnd CO₂ plumel migraltion, alllowing for optimizaltion of injelction palralmeltelrs to malintalin subsurfalcel stalbility and sustain long-term injectivity under evolving reservoir conditions. Welll intelgrity, al maljor potelntiall lelalkalgel palthwaly, is idelntifield als al criticall ellelmelnt relquiring morel robust delsign, maltelrialls, alnd Plugging alnd ALbalndonmelnt (P&AL) protocols thaln convelntionall stalndalrds. Fielld vallidaltion through controlleld elxpelrimelnts alnd aldvalnceld monitoring telchnology hals delmonstralteld thel albility to deltelct minor lelalks with locallizeld alnd relvelrsiblel elnvironmelntall impalcts. This intelgralteld alnd preldictivel alpproalch is considelreld aln elsselntiall prelrelquisitel for elnsuring thel selcurity of pelrmalnelnt storalgel, building public trust, alnd alccellelralting thel implelmelntaltion of Calrbon Calpturel alnd Storalgel (CCS) als al pillalr of climaltel chalngel mitigaltion.
Remote Sensing–Driven Drought Assessment Using Temperature Vegetation Dryness Index (TVDI) Derived from Landsat 8 Imagery Affandy, Nur Azizah; Nisa, Tika Ziadhatin; Nabilah, Salwa; Hidayah, Entin
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.3.27329

Abstract

Drought, a persistent state of water scarcity, is a critical challenge for agriculture and resource management. This study examines drought variability in Lamongan Regency from 2021 to 2023 using the Temperature Vegetation Dryness Index (TVDI) derived from Landsat 8 imagery, integrating Land Surface Temperature (LST) and NDVI to classify conditions from wet to dry. Results show the largest moderate drought in June 2021 (1,660.39 km²) and the most extensive severe drought in October 2023 (1,561.39 km²). In 2023, wet-normal conditions dominated early months, while dry areas expanded in the peak dry season. In this study, TVDI was derived using a simplified global normalization of LSTmin and LSTmax rather than the standard pixel-by-pixel NDVI-LST triangular feature space, which is acknowledged as a methodological limitation. An anomaly occurred in February, where high rainfall coincided with widespread dryness. Furthermore, validation with rainfall data showed a very weak correlation (R2 =0.090). This low correlation indicates a distinct time lag between precipitation events and soil moisture response, as well as the strong influence of local evapotranspiration and soil water retention capacity rather than rainfall alone. This study demonstrates that while TVDI is useful for rapid drought mapping, integration with local hydrological parameters is essential for improved accuracy.
Identification of Natural Hydrogen Sources from Geochemical Study in Tanjung Api Area, Central Sulawesi, Indonesia: Analysis from Open Dataset and Future Prospects Handoyo; Sigalingging, Asido Saputra; Sanjaya, Indra
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.3.27841

Abstract

In the effort to develop environmentally friendly energy, natural H2 plays a major role due to its large source originating from the Earth's mantle. Therefore, studies on the analysis of the origin of H2 are crucial. The study in this paper aims to provide additional analysis on the origin of H2 in gas samples from the Tanjung Api area, Ampana Basin, Central Sulawesi, Indonesia. This study discusses geochemical analysis and its correlation with the source of H2. Laboratory tests of gases such as H2, CH4 and δ13C1 isotopes were used to predict the origin of H2. The results of these laboratory tests were compared with results from various H2 source locations from around the world to support and strengthen predictions regarding H2 sources in this study area. The results of this study show an H2 concentration value of 35%, δ13C1 value of -15.2 ‰ and ln(CH4/H2) with a value of -0.0901 correlated with the type of abiogenic gas that is very likely derived from serpentinization reactions in ultramafic rocks in the East Sulawesi Ophiolite (ESO) system. According to the result of this study, future studies are expected to map locations where H2 gas accumulates in reservoir rocks in the Ampana Basin. This can be achieved through more comprehensive geophysical (e.g. seismic, magnetic, and/or gravity) and geological studies. Through this study, it is expected that it can contribute to further research and development of natural H2 energy in Indonesia.
The Characteristics of Andesite and Sandstone as Aggregate Substitution in Concrete Mixtures Elizar, Elizar; Retno, Deedy Purnomo; Suryadi, Adi; Faisal; Cantika, Yuliea Cindy
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

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Abstract

Aggregates make up the biggest part of concrete.   The use of locally available aggregate in concrete production can reduce transportation distance and potentially minimize the carbon footprint. The objective of this study is to analyze local aggregates is andesite and sandstone that from a region in Riau. The method of research is an experiment in laboratory for identitication of the chemical composition, abrasion resistance testing, and concrete compressive strength testing with these local aggregates. Concrete samples were made with a target strength of 30 MPa and tested after 7, 14, and 28 days of curing. The results showed that the higher chemical content of SiO2 for andesite aggregate is a 44,66 % and for sandstone aggregate is 64.63%. The abrasion resistance for andesite aggregate is a 12,40%  and sandstone aggregate is 66.00%, indicating that the andesite aggregate meets spesification is a level below 40%. Meanwhile, the concrete compressive strengths of 32.35 MPa after 28 days of curing for andesite aggregate and 11.70 MPa for sandstone aggregate indicate that the andesite aggregate achieved the expected compressive strength of 30 MPa. Research indicates that while sandstone has a higher SiO2 than andesite, it yields lower abrasion resistance and concrete compressive strength than andesite aggregate. This reinforce the fact that high SiO2  content does not directly guarantee increased concrete compressive strength. Rather, abrasion values and mechanical characteristics of the aggregate must be considered collectively. Local andesite aggregate is suitable for structural concrete mixes, whereas sandstone aggregate is appropriate for non-structural applications.
Sentinel-1 Estimated Maximum Flood Extent for Sub-District Flood Exposure Mapping in Makassar City, Indonesia Dewantara, Agsha; Widyatmanti, Wirastuti; Wibowo, Sandy Budi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.3.29691

Abstract

Sub-district level information on flood exposure is basic requirement for disaster mitigation and spatial planning, yet it is rarely available for Indonesian cities because satellite imagery seldom captures the inundation peak. The February 2023 flood in Makassar City is a clear case: with only Sentinel-1A operating on 12 day repeat cycle, the peak of 13-17 February was never imaged and nearest acquisition on 21 February recorded receded condition. This study reconstructs the Estimated Maximum Flood Extent (EMFE) for that unobserved peak using surrogate variables and compares two reconstruction pathways: EMFE-GRD, in which backscatter thresholding is corrected to peak conditions using external hydrological data and EMFE-SLC in which interferometric coherence change carries the peak information inherently and receives only a partial correction. The novelty of this study is the explicit use of surrogate variables to reconstruct an unobserved flood peak, combined with paired sample significance testing to select between reconstruction pathways. Both products were validated against 90 paired field points. EMFE-GRD was the more accurate pathway (overall accuracy 62.2%, 95% CI 52.2-72.2%, Kappa 0.25), and the paired difference against EMFE-SLC was statistically significant (McNemar p = 0.028), although both products remain only moderate agreement and EMFE-SLC was not distinguishanle from chance. EMFE-GRD indicates that about 41.6 % of the mainland area is potentially inundated, concentrated in the low-lying eastern and northern expansion zones. The results are presented as a two tier screening instrument, in which a core zone of inter method agreement guides evacuation and resource placement while an anticipatory zone suppots worst case planning, giving BPBD Makassar a field validated basis for mitigation priorities and for integration into the city spatial plan.
Numerical Analysis of Joint-Controlled Slope Stability under Blasting-Induced Vibration: A Case Study of the Jakarta-Bandung High-Speed Railway Tunnel 4 Aditya, Fariz; Sulistianto, Budi; Karian, Tri; Prassetyo , Simon Heru; Simangunsong, Ganda Marihot
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.3.29752

Abstract

Blasting for Tunnel 4 of the Jakarta–Bandung High-Speed Railway is conducted close to an active andesite quarry, where blast-induced vibration may interact with pre-existing discontinuities and groundwater to reduce slope stability. This study evaluates the combined effects of joint structure, groundwater conditions, and tunnel-blasting vibration on quarry-slope stability using two-dimensional finite-element analysis in RS2 with the shear-strength-reduction method. Field characterization comprised scanline discontinuity mapping, rock-mass classification, laboratory testing, and Minimate vibration monitoring. Jointless and explicitly jointed slope models were evaluated under four scenarios: dry-static, dry-dynamic, saturated-static, and saturated-dynamic. The monitored blast dataset was additionally evaluated using the site-specific scaled-distance relationship, PPV = 156.3(SD)−1.056 (R2=0.376), where SD = R/√Q, to characterize vibration attenuation and its uncertainty. Under static conditions, explicit joints reduced the factor of safety (FoS) by 3% in the dry model and 6% in the saturated model. Under dynamic conditions, the joint-related FoS reduction increased to 15% in the dry model (4.1 to 3.5) and 42% in the saturated model (3.4 to 2.0), with the probability of failure reaching 17% in the critical saturated-dynamic-jointed scenario. A charge-per-delay sensitivity analysis at a fixed source-to-slope distance of 25 m further showed that increasing explosive charge progressively increased the predicted longitudinal peak particle acceleration (PPA) and reduced slope stability. Based on the adopted stability criteria, the analysis supports maximum site-specific charges of 30 kg/delay under dry conditions and 20 kg/delay under saturated conditions at 25 m. These results demonstrate that groundwater saturation substantially amplifies the destabilizing influence of blasting on joint-controlled slope response and highlight the need for groundwater-dependent blast control, controlled trial blasts, and field monitoring before operational implementation.
Analysis of the Effects of Earthquakes on the Pile-Box Culvert System at the Gentos Bridge, Situbondo, Indonesia Alihudien, Arief; Satritama, Muhammad Ilham; Haq, Naufal Hadardien; Alfaries, M. Rifki
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.3.29784

Abstract

Soft soil conditions present significant challenges to the seismic performance of transportation infrastructure, particularly box culverts constructed in earthquake-prone regions. This study evaluates the effectiveness of galam timber piles in improving the stability and reducing the settlement of a pile-supported box culvert at the Gentos Bridge, Situbondo, Indonesia. Three-dimensional numerical analyses were performed using PLAXIS 3D, in which the soil behavior was represented by the Mohr–Coulomb constitutive model. Dynamic loading was applied using the RSN2736 Chi-Chi (CHY101-E) earthquake record from the NGA-West database, which was spectrally matched to the target response spectrum specified in SNI 1726:2019. The matched earthquake motion had a maximum acceleration of 0.20568 g, while the target design spectrum corresponded to a Peak Ground Acceleration (PGA) of 0.307 g. The numerical model incorporated layered soil conditions, staged construction, and soil–structure interaction to evaluate the seismic response of the box culvert foundation system. The results indicate that the installation of galam timber piles reduced elastic settlement from 5.5 cm to approximately 3.0 cm, representing a 45.5% reduction, while increasing the safety factor from 2.55 to 3.02, corresponding to an improvement of 18.4%. These improvements demonstrate a significant enhancement in foundation stiffness, load distribution, and overall structural stability under seismic loading. The main scientific contribution of this study lies in demonstrating the feasibility of utilizing locally available galam timber piles as an effective foundation reinforcement system for pile-supported box culverts subjected to earthquake loading. The proposed approach provides a practical and sustainable alternative for improving the seismic performance of transportation infrastructure constructed on soft soils in earthquake-prone regions.
Spatial Variation of Physicochemical Characteristics of Auya River Water in Relation to Geological Conditions, Paniai Regency, Central Papua, Indonesia Boma, Deserius; Sukiyah, Emi; Syah Alam, Boy Yoseph Cahya Sunan Sakti
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.3.30300

Abstract

This study aims to analyze the spatial variation of the physicochemical characteristics of Auya River water and its relationship to geological conditions in Paniai Regency, Central Papua. In situ measurements were conducted at 20 stations (ST01–ST20) from upstream to downstream for Total Dissolved Solids (TDS), pH, Electrical Conductivity (EC), and temperature. Based on field conditions, the stations were grouped into Intrusive Igneous Rock (ST01–ST05), Siltstone (ST06–ST10), and Sand (ST11–ST20). Data were analyzed using descriptive statistics, One-Way ANOVA, Welch ANOVA, Tukey HSD, Pearson correlation, and partial correlation by controlling for cumulative distance. The results showed TDS 25–153 mg/L, pH 6.50–7.77, EC 48–166 µS/cm, and temperature 16.80–20.20 °C, with an increasing trend from upstream to downstream. One-Way ANOVA showed significant differences between groups for TDS, pH, EC, and temperature (p < 0.001). Tukey's test showed that all pairs of groups differed significantly in TDS, pH, and EC, while temperature between Intrusive Igneous Rock and Siltstone was not significantly different (p = 0.073). Pearson's correlation showed a very strong positive relationship between parameters (r = 0.969–0.985; p < 0.001), but the coefficient decreased after cumulative distance was controlled. These findings suggest that the physicochemical characteristics of the water form spatial gradients that coincide with changes in geological conditions. Because the geological groups are also arranged in an upstream–downstream sequence, these statistical differences are interpreted as geological–spatial associations, not evidence of an independent influence of lithology. Thus, variations in the Auya River water likely reflect the combined contributions of geological conditions, longitudinal position, solute accumulation, elevation, and environmental factors along the river course, which also need to be considered in hydrogeochemical interpretations.
Front matter JGEET Vol 11 No 03 2026 Adi Suryadi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

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