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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 641 Documents
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MCDA-AHP-GIS-Based Site Suitability Assessment for a Multi-Utility Tunnel in Panakkukang Sub-district, Makassar City , Indonesia Muthalib, Ade Nirwani Abdurahman; Rumata, Nini Apriani; Burhanuddin, Fathurrahman; Faisal, Muhammad; Firdaus; Rahmania; Bakti , Rizki Yusliana
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): Article In Press-JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

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This study develops a transparent MCDA–AHP–GIS framework to screen Multi-Utility Tunnel (MUT) corridor suitability in Panakkukang Sub-district, Makassar City, using 2024 baseline datasets and five criteria: utility/network density (C1), road functional class and corridor capacity (C2), flood susceptibility (C3), activity intensity (C4; proxied by kelurahan-level population density), and spatial planning compatibility with RTRW/RDTR (C5). All layers were standardized and reclassified (1–3 or 1–5) and integrated using Weighted Linear Combination (WLC) with AHP-derived weights (CR = 0.028), where C1 (0.26) and C5 (0.24) were highest, followed by C2 (0.19), C4 (0.16), and C3 (0.15). The 2,918.3-ha study area was classified into Very Unsuitable (88.2 ha; 3.0%), Unsuitable (405.8 ha; 13.9%), Moderately Suitable (764.9 ha; 26.2%), Suitable (935.8 ha; 32.1%), and Highly Suitable (723.6 ha; 24.8%). A corridor-focused overlay shows that 436.9 ha fall within the Suitable–Highly Suitable mask, of which 127.3 ha (29.1%) intersect high flood-hazard zones, indicating that some priority segments require attention during detailed planning. Uncertainty mainly arises from buffer distances and reclassification thresholds and from non-differentiating attributes in some utility layers; however, a ±10% weight sensitivity test yields only minor shifts in class areas and preserves the main priority-corridor pattern.
Water Hyacinth Phytoremediation for Reducing COD, BOD, and Pb in Leachate: An Environmental Geoscience Perspective Callista Elvania, Nindy; Rahmawati, Laily Agustina; Fitriani, Eka Luluk; Sugianti, Reva Putri
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): Article In Press-JGEET Vol 11 No 02 : June (2026)
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Leachate generated from landfill disposal sites poses a serious environmental threat due to its high content of organic pollutants and heavy metals. Elevated levels of chemical oxygen demand (COD), biochemical oxygen demand (BOD), and lead (Pb) may contaminate soil and surrounding water bodies if the leachate is not properly treated. Phytoremediation using water hyacinth offers an eco-friendly and low-cost alternative for leachate treatment. This study was conducted to evaluate the effectiveness of water hyacinth in reducing COD and BOD concentrations and removing Pb from leachate. An experimental method with a batch reactor system was applied, using 30 clumps of water hyacinth in each tank and contact time variations of 7, 14, and 21 days. COD, BOD, and Pb concentrations were measured before and after treatment using standard water quality analysis methods. The results showed that the 21-day contact time produced the highest removal efficiency. COD decreased from 1551.21 mg/L to 520.32 mg/L, representing a 66.44% reduction, while BOD decreased from 576.34 mg/L to 150.62 mg/L, equivalent to a 73.88% reduction. Pb concentration also decreased from 0.92 mg/L to 0.18 mg/L, with a removal efficiency of 80.43%. These reductions are attributed not only to the physiological activity of water hyacinth but also to the interactions among hydrological conditions, root zone architecture, and rhizosphere-mediated microbial communities, which collectively facilitate biodegradation, assimilation, and bioaccumulation of pollutants. Overall, the study highlights the critical role of integrating environmental geoscience principles with phytoremediation to optimize leachate treatment. Understanding the geochemical characteristics of leachate, subsurface hydrodynamics, and plant-microbe interactions provides a scientific basis for designing sustainable, low-cost, and efficient treatment systems. The findings indicate that water hyacinth can serve as a practical and geoscience-informed solution for mitigating organic and heavy metal pollution from landfill leachate, with 21 days identified as the optimum contact time.
The Water Chemistry Geothermal of Ranang-Kasimbar Hot Springs, Parigi Moutong Regency, Central Sulawesi, Indonesia Anna Yushantarti; Dudi Hermawan; Dwi Fitri Yudiantoro
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): Article In Press-JGEET Vol 11 No 02 : June (2026)
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The Ranang-Kasimbar geothermal system in Central Sulawesi is located within the West Sulawesi Mandala, an area significantly influenced by the active tectonic zone of the Palu-Koro Fault that controls the emergence of surface manifestations. This study aims to characterize the water chemistry of the Ranang-Kasimbar hot springs through surface geological mapping and fluid geochemical analysis, which includes cation-anion analysis, stable 18O and 2H (D) isotopes, and geothermometer calculations for subsurface temperature estimation. The geological conditions of the study area are composed of Cretaceous-Eocene metamorphic rocks, Tertiary intrusive rocks, and Quaternary sedimentary rocks, with structural controls in the form of north-south trending strike-slip faults and a normal fault system that forms a central depression zone as controls for the emergence of manifestations. Field data identified hot springs with surface temperatures ranging from 55–61°C and alkaline pH (~9). Geochemical analysis results classify the geothermal fluid as a chloride type indicating a deep reservoir origin, with a Cl/B ratio indicating strong interaction with igneous rocks and partial equilibrium conditions. Isotope analysis indicates a dominant mixing with meteoric water with very low oxygen-18 enrichment. Reservoir temperature estimation using a Na-K geothermometer and a silica-enthalpy mixing model indicates a minimum temperature of 130°C, thus categorizing it as a medium enthalpy system. This geothermal system is controlled by secondary permeability from normal and strike-slip fault structures, with the heat source suspected to originate from residual heat from Plio-Pleistocene andesitic intrusions.
Use of the Diffuse Field Assumption (DFA) Method to Determine The Condition of The Subsurface Layer in The Government Office Area of Bengkulu City, Indonesia Efmadani; Farid, Muchammad; Refrizon; Raihana, Hana; Anggi, Arya Putra; Hasugian, Basdikki; Al-Ansory, Andre Rahmat
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): Article In Press-JGEET Vol 11 No 02 : June (2026)
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Bengkulu City lies in an earthquake-prone region because of tectonic activity along the Sumatra subduction zone. Subsurface characterization is critical for safe infrastructure planning. This study identifies subsurface conditions in the Bengkulu City Government office area using microtremor data analyzed with the Diffuse Field Assumption (DFA) approach. Researchers recorded 52 measurement points to determine key seismic parameters: dominant frequency (f0), amplification factor (A0), seismic vulnerability index (Kg), and shear wave velocity (Vs30). The results show that f0 values range from 3.57 to 14.8 Hz, A0 from 1.62 to 7.18, Kg from 0.30 to 6.35, and Vs30 from 189.29 to 740.48 m/s, indicating significant spatial variation in subsurface conditions. Areas characterized by low f0, high A0, and low Vs30, particularly at points T33 and T41, are identified as zones with higher seismic vulnerability. The application of the DFA approach enables a more reliable estimation of subsurface shear wave velocity and enhances the interpretation of site effects compared to conventional analysis. These findings highlight the importance of integrated seismic parameter mapping to support earthquake hazard mitigation and urban spatial planning in tectonically active regions.
Optimizing Tsunami Evacuation Route with GIS and Network Analysis: Case Study of Barus City, Central Tapanuli, Indonesia Sahputra, Erry; Basid, Abdul; Sirait, Ratni; Lubis, Lailatul Husna
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): Article In Press-JGEET Vol 11 No 02 : June (2026)
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A tsunami is a natural disaster triggered by the vertical displacement of the seafloor following a major earthquake along a megathrust zone. Barus District lies within the active Sumatran megathrust, making it highly vulnerable to large earthquakes that could generate tsunamis. This study aims to map tsunami hazard and risk zones under a 16-meter wave scenario and to model evacuation routes using Geographic Information Systems (GIS) and Remote Sensing approaches. The research employs a descriptive quantitative method, integrating spatial data through overlay and network analysis techniques. The analysis revealed that high-hazard and high-risk zones each cover 0.64 km² out of the total 2.27 km², primarily located in Pasar Terandam and Pasar Batu Gerigis villages. Evacuation route modeling showed estimated travel times ranging from 25.06 to 65.73 minutes, assuming an average walking speed of 1.2 m/s. Among the designated shelters, the Catholic church offers a more efficient route, whereas evacuation to the HKBP church requires more than 60 minutes exceeding the ideal time limit. These findings highlight the urgent need to prioritize disaster mitigation strategies to ensure the effectiveness of tsunami evacuation systems in high-risk coastal areas.
Estimation of Subsurface Structure Using Euler Deconvolution and SVD Methods of Geomagnetic Data in the Non-Volcanic Geothermal Area of Tahi Ite Village, Bombana, Southeast Sulawesi, Indonesia Rani Chahyani; Manan, Abdul
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): Article In Press-JGEET Vol 11 No 02 : June (2026)
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This study aims to estimate the presence of subsurface structures in the geothermal area of ​​Tahi Ite Village, Bombana Regency, Southeast Sulawesi by using geomagnetic data collected in the field at 656 measurement points using a PPM unit divided into nine survey lines oriented N0oS, with distances between measurement points and between survey lines of approximately 50 m and 180 m, respectively. Based on the research results, the Total Magnetic Intensity (TMI) values for the study area ranged from 42,375.605 to 42,817.045 nT. A value range of 441.44 nT indicates the presence of rock magnetic heterogeneity in the geothermal manifestation area. After applying Diurnal Correction and IGRF Correction, the Total Magnetic Anomaly (TMA) values were found to be approximately -136.89 to 200 nT. The Local Magnetic Anomaly (LMA) was obtained after performing an upward continuation process through four continuation stages up to an altitude of 1,700 m from the reference surface, The Local Magnetic Anomaly (LMA) was obtained after performing an upward continuation process through four continuation stages up to a height of 1,700 m from the reference surface, and was found to be within a range of approximately -120 to 60 nT. Subsequently, Reduced to the Pole (RTP) processing was applied to transform the magnetic response so that it lies above its causative source and exhibits a monopolar nature. On the RTP results, the Euler Deconvolution (DE) method with a Structural Index of N=0 and the Second Vertical Derivative (SVD) method were applied to infer the presence of subsurface structures. The results show the presence of magnetic anomaly patterns suggesting strong structural control with a dominant North–South orientation. It is estimated that there are approximately five to nine minor faults with depths ranging from <15 m (Very Shallow) to >55 m (Deep), and it is known that approximately two minor faults intersect the Tahi Ite hot spring. The existence of these minor faults is thought to act as thermal conduction pathways and channels for the migration of hydrothermal fluids to the surface with the water source in the reservoir originating from surface or meteoric water. These findings are also supported by the presence of outcrops, further confirming that the Tahi Ite Village geothermal system is non-volcanic in nature and controlled by secondary structures in the form of minor faults.
Relative Age and Depositional Environment of The Limestone Unit of Karangsambung Formation in Jatibungkus Hill, Kebumen Geopark, Indonesia Kurniasih, Anis; Wicitra, Annisa Puspa; Qadaryati, Nurakhmi; Khorniawan, Wahyu Budhi; Dalimunthe, Hasnan Luthfi; Setyawan, Reddy; Jayanti, Anita Galih Ringga
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): Article In Press-JGEET Vol 11 No 02 : June (2026)
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The Jatibungkus Hill is an isolated karst hill and is one of the olistolith fragments in the Karangsambung Formation deposited as olistostrome deposits. This formation formed above the Luk-Ulo Mélange Complex, one of the geological heritage sites in the Kebumen Geopark. The presence of limestone as a fragment in the olistostrome deposits requires further investigation because its formation history is related to regional geological history. This study aims to determine the relative age and depositional environment of limestone in Jatibungkus Hill based on microfossil analysis through petrographic observations. Of the 39 rock samples obtained during field data collection, 15 rock samples were selected for petrographic analysis. The petrographic analysis is divided into two parts, namely descriptive methods and point counting as the basis for classifying carbonate rocks. Based on the classification results, reef facies analysis was conducted using facies zonation and standard microfacies (SMF) to obtain an overview of the limestone depositional environment. In addition, the types of large foraminifera fossils and algae were also used as a basis for determining the relative age. The lithology found in the research area consist of packstone, rudstone, grainstone, and crystalline limestone. The limestone depositional environment is located in SMF 4, SMF 5, and SMF 6 which are included into FZ 4 (Slope) on a restricted carbonate platform. This facies zone influenced by currents and waves between the storm base wave and the normal base wave. The petrographic analysis showing the domination of large bioclastic grain indicating that the deposition were under a high energy. The influence of waves is also reflected in the mixture of bioclass and lithoclast grains or high-density terrigenous clastics that are observed in most of the samples. This facies contains more quartz clastics and bioclast grains than carbonate mud as consistently observed in the identified samples.The association of large benthic foraminifera fossils and algae indicates that the limestone was formed in Zone Ta1 (Late Paleocene) characterized by the presence of Discocyclina sp., Ranikothalia sp., Nummulites sp., Miscelanea sp., Distichoplax biserialis, and Parachaetes sp. It can be seen that the deposition of the limestone olistolith occured after the initial subduction event which produced the mélange complex in Early Cretaceous.
Mine Dewatering Design for Re‑Mining in a Mined‑Out Laterite Nick-el Pit: Case Study of South Pit, PT NPM, Central Sulawesi Ananda, Sri Sovia Duha; Baharuddin, Ichsan Invanni; Har, Rusli; Prabowo, Heri
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): Article In Press-JGEET Vol 11 No 02 : June (2026)
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This study aims to design an effective mine dewatering system for the South Pit mined-out area of PT Nusajaya Persadatama Mandiri, supporting re-mining activities. The methods used include hydrological analysis to determine the design rainfall using the Log Pearson Type III distribution, calculation of rainfall intensity using the Mononobe method, and estimation of runoff discharge using the rational method based on the catchment area. The results show that the design rainfall is 72.2 mm/day with a rainfall intensity of 49.9 mm/hr and a catchment area of 13.47 ha. The total inflow into the pit is 0.48 m³/s (1,726 .20 m³/hr), requiring a sump capacity of 7,250.03 m³. The pumping system is designed using a DnD LCC-M 100 pump with a capacity of 300 m³/hr, operated for 14 hours/day. The pumped water is conveyed through a 6-inch diameter HDPE pipe to a trapezoidal open channel, where it is then discharged into a Water Management Pond (WMP) with a total capacity of 11,200 m³, consisting of four compartments. The research results indicate that the designed mine drainage system is capable of effectively controlling mine water, thereby supporting safe and efficient re-mining operations.
Eocene Paleoclimatic Implications in the Bayat Basin Based on Nannofossil Distribution Rifa'i, Muhammad; Choiriah, Siti Umiyatun; Akmaluddin
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): Article In Press-JGEET Vol 11 No 02 : June (2026)
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The Middle–Late Eocene represents a critical interval of greenhouse climate evolution following the Early Eocene Climatic Optimum (EECO), yet quantitative paleoclimate records from low-latitude Southeast Asia remain scarce. This study presents a multi-proxy calcareous nannofossil-based reconstruction of surface-water conditions from the Gamping–Wungkal Formation in the Bayat Basin, southern Java. Detailed stratigraphic logging and systematic sampling along a 60 m section were combined with quantitative assemblage analysis and Scanning Electron Microscope validation. Biostratigraphic evaluation assigns the studied interval to the NP17 zone (Middle–Late Eocene). Paleoclimatic reconstruction integrates the Reticulofenestra Size Ratio (RSR), Warm-Water Index (WWI), Discoaster Abundance Ratio (DAR), and total Reticulofenestra abundance. Assemblages are dominated by medium- to large-sized Reticulofenestra and persistent Discoaster occurrences, indicating warm, oligotrophic, and stratified surface-water conditions. Despite global post-EECO cooling trends documented in mid- and high-latitude records, the Bayat data suggest sustained tropical greenhouse conditions during NP17. These findings are consistent with emerging evidence of latitudinal variability in Eocene climate evolution and establish the Bayat Basin as an important low-latitude archive for evaluating Paleogene greenhouse dynamics in Southeast Asia.
Seabed Morphology and Geohazard Assessment for Subsea Pipeline Routing based on MBES and Seismic Data: A Case Study of Teluk Palabuhanratu, Indonesia Salsabila, Chairunisyah Putri; Idarwati; Salni, Muhammad Alfath Salvano; Rasyid, Faris Nauval
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): Article In Press-JGEET Vol 11 No 02 : June (2026)
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To support the development of subsea pipeline infrastructure across Java, there is a need to assess geohazard potential in Teluk Palabuhanratu. The aim of this study is to characterize seabed morphology and evaluate its implications for geohazard potential for subsea pipeline routes. The method employed consists of morphometric analysis based on digital bathymetric model (DBM) that is derived from multibeam echosounder (MBES), delineation of seabed morphological units by integrating DBM with seismic interpretation, and geohazard assessment based on morphometric parameters and morphological units. Seabed morphology is predominantly characterized by very gentle to gentle slopes, near-planar curvature, and low roughness, while localized zones of steep slopes, complex curvature, and high roughness are associated with faults, submarine landslides, and mud volcanoes. Ten morphological units were identified, including slopes, ridges, knolls, channels, basin floors, sand ridges, mounds, valleys, gullies, and landslides. The geocost-based geohazard assessment indicates a spectrum of hazard potential ranging from low to high for subsea pipeline. High hazard levels are associated with steep slopes, high roughness, and morphological units influenced by erosion and mass-transport processes, such as gullies, valleys, and fault-associated ridges.

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