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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 622 Documents
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Spatiotemporal Dynamics of Mangrove Cover in Aceh Tamiang Regency, Indonesia (2020–2024): An NDVI-Based Remote Sensing Assessment Cut Maila Hanum; Kamal, Alfarazi; Metananda, Arya A.; Kurniawati; Dedi Kiswayadi; Bakruddin
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.1.23237

Abstract

This study examines spatiotemporal changes in mangrove cover and canopy density in Aceh Tamiang Regency, Indonesia, between 2020 and 2024, using an integrated remote sensing and field-based approach. High-resolution PlanetScope imagery (3 m) and Sentinel-2A data (10 m) were analyzed within a GIS framework, with the Normalized Difference Vegetation Index (NDVI) employed to classify mangrove density into three categories: dense (NDVI ≥ 0.43), moderate (0.33 ≤ NDVI < 0.43), and sparse (NDVI < 0.33). Results reveal a net loss of 379.65 hectares of mangrove cover—declining from 10,796.76 ha in 2020 to 10,417.11 ha in 2024—with over 99% of deforestation occurring in production forest zones, primarily due to conversion for aquaculture and oil palm plantations. Concurrently, dense mangrove areas decreased by 2,226 hectares (–18.9%), while sparse mangrove coverage expanded by 1,542 hectares (+28.1%), signaling ecosystem degradation despite localized natural regeneration. These structural changes undermine critical ecological functions, including coastal protection, blue carbon storage, and habitat provision for species such as Batagur borneoensis. The findings underscore the urgent need to integrate satellite-derived monitoring into district-level spatial planning, prioritize community-based rehabilitation in transitional zones, and strengthen enforcement of mangrove protection under Indonesia’s Government Regulation No. 27 of 2025 to ensure long-term coastal resilience.
Analysis of Content, Source and Impact of Heavy Metals in Sombori Island, Central Sulawesi, Indonesia Hasria, Hasria; Usman, Ida; Saeri, Karim; Nasaruddin; Sara Septiana; Rais, Mohammad; Harisma, Harisma; Musrajab, Silo
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.1.23856

Abstract

A study was conducted on Sombori Island, Central Sulawesi. The purpose of this study was to determine the content of heavy metals and the origin of contamination and the impact of heavy metal contamination. Seawater samples totaling 30 stations were analyzed in the form of total suspended solids (TSS), pH, salinity and heavy metal content of hexavalent chromium (Cr6+) and nickel (Ni) using Atomic Absorption Spectrometry (AAS) analysis. The heavy metals chromium (Cr) and nickel in the sediment were analyzed using flame Atomic Absorption Spectrometry (AAS). The results of the study showed that heavy metals in seawater in the form of Ni are still safe for the marine ecosystem of the research area. However, the heavy metal Cr6+ has contaminated several marine waters stations because it has exceeded the established quality standards so that it can have a negative impact on the marine ecosystem including humans through the food chain. The content of heavy metal Cr in marine sediments has not passed the established sediment quality standards. However, for heavy metal Ni in sediment, it has exceeded the established sediment quality standards so that it has had a negative impact on the marine ecosystem that lives and feeds around/on the sediment including humans through the food chain. Sources of contamination of heavy metals in water and sediment are from the weathering of ultramafic rocks containing heavy metals, mining activities, shipping activities using fossil fuels, the use of ship paint containing heavy metals, solid waste from ships containing heavy metals and domestic waste.
Improvement of Earthquake Source Mechanism Using Waveform Inversion in the Indo-Australian Oceanic Plate Nurma Aisyah; Muksin; Nazli; Sandriadi, Wahyu
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.1.24276

Abstract

The Indo-Australian Oceanic Plate region is an active and complex subduction zone. Tectonic activity in this area generates various types of faults, including thrust, strike-slip, and normal faults, reflecting the dynamic deformation of the lithosphere. This study aims to refine earthquake source parameters using waveform inversion based on the Bayesian Bootstrap approach. Seven earthquake events with magnitudes greater than 5, occurring between 2010 and 2025, were analyzed to obtain more accurate parameters, including location, depth, origin time, duration, magnitude, and fault plane orientation (strike, dip, and slip). Waveform data were retrieved from the USGS catalog and processed using the Grond and Pyrocko software. The inversion results indicate significant shifts in initial parameters, with misfit values below 0.5, demonstrating a high level of agreement between synthetic and observed waveforms. The tectonic interpretation of the inversion outcomes reveals a relationship between hypocenter depth, fault type, and subduction zone geometry. This research is expected to contribute to a better understanding of earthquake source mechanisms and serve as a scientific reference for disaster mitigation efforts in the Indo-Australian Plate region.
The Effect of Limestone Variations on the Compressive Strength of Clay Soil Stabilized with Pumice Microsilica and Aluminum Hydroxide A. Majid, Budiman; Gaus, Abdul; Adriaty, Yolly; Helda Evita Putri; Rauf, Ichsan
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.1.24976

Abstract

The pozzolanic reaction is a chemical interaction involving calcium hydroxide, silica, and alumina that contributes to the chemical stabilization of soil. An optimized proportion of these three components can yield greater improvements in soil strength compared to the use of a single stabilizing material. This research examines the additional effect of limestone as a calcium source on clay soil stabilized with pumice-based microsilica and hydroxide aluminate. The testing of soil properties in this research follows the American Society for Testing Materials (ASTM) guidelines. The stabilization materials used include pumice, hydroxide aluminate, and limestone. The mechanical behavior of the blend of these three minerals is determined from the findings of the unconfined compressive strength tests, using cylindrical test samples measuring 35 mm in diameter and 70 mm in height. Variations in the addition of lime used to form the mixed matrix were 2%, 4%, and 6% by weight of dry soil. Laboratory test results showed a very significant increase in unconfined compressive strength (qu) compared to natural soil or soil stabilized only with silica and alumina. The optimum value for lime addition in this mixture was 4%, which resulted in a qu value of 52.48 kg/cm².
Evaluation Of The Oil Potential, Kerogen Type And Degree Of Maturation Of The Kipala Shales (Kwilu Province,Democratic Republic of Congo) Based On Rock-Eval Parameters Munene Asidi, Djonive; Mayena, Thomas Kanika; Mwanza, Fredéric Makoka; Levesque, Makuku Mbo; Adalbert Jules, Makutu Ma Ngwayaya; Ruben, Koy Kasongo
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.1.25680

Abstract

This note aims to contribute to the assessment (still rudimentary at this stage) of the oil potential, kerogen type and degree of maturation of the Kipala shales, using Rock Eval parameters (TOC or COT: Total Organic Carbon; Tmax: Maximum Temperature; Peaks S1, S2, S3; IO: Oxygen Index; HI: Hydrogen Index; PI: Production Index; PP: Production Potential; RC: Residual Carbon; MINC: Mineral Carbon), as well as the associated geochemical diagrams, based on ten samples of these shales analysed by Rock Eval Pyrolysis at the PETROCCI laboratory in Côte d'Ivoire. The main results of this assessment can be summarised as follows: (i) based on the criteria established by Espitalié et al. (1977), the high TOC content (6 to 15%) of these Kipala rocks classifies them as excellent hydrocarbon source rocks; (ii) the kerogen in the shales studied is ‘Type I’; (iii) the evolution of their organic matter is at the ‘Immature-Mature’ limit; with the exception of two samples which, with their relatively high Tmax (435°C < Tmax > 455°C), are classified as mature rocks; i.e. rocks that have reached ‘oil window’ conditions; (iv) almost all of the Kipala shales are classified as source rocks producing good quality oil; (v) the very high PP values of these shales classify them as rocks with very good to excellent potential, suggesting that they can generate hydrocarbons; (vi) IP values < 0.1 for most of the shale samples analysed, coupled with their low Tmax values (< 435°C), suggest that the organic matter in these shales is “immature” or even “early mature”, as evidenced by the presence of traces of bitumen in some of the shale samples.
A GIS-Based Multicriteria Decision Framework for Provincial and Regional Distribution Centers: Integrating Land Capability (SKL) and Accessibility Metrics in South Kalimantan, Indonesia Mifta Eka Febriantina Rahayu; Muhammad Rifky Zainul Royan; Miftahul Ridhoni; Kiky Permana Setiawan
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.1.26825

Abstract

This study develops a GIS-based multicriteria decision analysis (GIS-MCDA) framework to identify priority locations for Provincial Distribution Centers (PDP) and Regional Distribution Centers (PDR) in South Kalimantan Province. Its principal contribution is the integration of Land Capability Units (SKL), which represent the intrinsic physical suitability of land, with accessibility and utility indicators that capture operational support. The framework employs a vector-overlay procedure that combines thematic layers, standardized scores, and a Weighted Linear Combination (WLC). The SKL component is weighted at 0.55, while the accessibility-utility component is weighted at 0.45, reflecting the premise that physical land suitability constitutes a fundamental threshold that cannot be fully offset by high accessibility alone. The results show that class S2 dominates the study area, covering 1,566,737.61 ha (42.22%), followed by S3 at 1,037,104.41 ha (27.95%) and S4 at 1,004,058.64 ha (27.06%). By contrast, S1 covers only 68,751.95 ha (1.85%), while class N accounts for 34,496.78 ha (0.93%). These findings indicate that most of South Kalimantan is conditionally suitable, meaning that PDP/PDR development generally still requires technical adjustment, infrastructure improvement, or a combination of both. Spatially, the most prospective areas are concentrated in the Banjarbakula metropolitan corridor and several strategic logistics nodes. Overall, the study demonstrates that distribution center location decisions should simultaneously account for physical land resilience and operational efficiency in order to support more adaptive, measurable, and policy-relevant regional logistics planning
The Smart–Resilient–Livable–Lovable (SRLL) Model of Two Metropolitan in Sumatera Sinatra, Fran; M. Abdi Danurja, R.A; Fenrianka J. N. D; Aprianto, Agung
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.1.27118

Abstract

Urban development in the twenty-first century is shifting from a technocentric focus on a human-centered paradigm that emphasizes emotional bonds. The limited exploration of the interconnections among smart, resilient, and livable dimensions in shaping urban lovability presents both theoretical and empirical gaps. This study proposes and tests the Smart–Resilient–Livable–Lovable (SRLL) model to examine how technological innovation, resilience, and livability shape lovability. Utilizing a quantitative design with Structural Equation Modelling (SEM), the research compares two waterfront metropolises in Sumatera, Indonesia. Findings reveal Palembang follows a structural-integrative model, where smartness and resilience significantly enhance livability (P value 0.00), which in turn acts as a crucial mediator fostering lovability. Conversely, Bandar Lampung exhibits a social-emotional model, where smart urbanism initiatives directly build civic pride (P value 0.00) despite existing infrastructural gaps and insignificant links between livability and emotional attachment (0.077). City pride across both cities demonstrate that urban identity can grow from the soul of a city – its culture and social values – even when the body – physical infrastructure is still developing. The results offer policymakers insights for designing human-centered strategies that reconcile physical systems with the psychological well-being of residents.
Lithological Control on Variations in Total Dissolved Solids (TDS) and pH of Auya River Water, Obano Area, Paniai Regency , Central Papua Boma, Deserius; Mote, Dance
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.1.27493

Abstract

This study focuses on the study of the influence of lithology and the level of rock weathering on the water quality of the Auya River located in Obano District, Paniai Regency, Central Papua, using Total Dissolved Solids (TDS) and pH as the main indicators. The approach applied is a quantitative descriptive method, which was carried out through field surveys at six observation points, direct measurement of water quality parameters, and statistical analysis including descriptive statistics, Pearson correlation, and linear regression. The results of the study indicate an increasing trend in TDS and pH values from upstream to downstream, which is related to changes in lithology from intrusive igneous rocks to sedimentary rocks, accompanied by an increase in weathering intensity. The correlation test shows a very strong relationship between TDS and pH (r = 0.975), as well as a significant relationship between water quality parameters with lithology and weathering levels. The results of the regression analysis show that lithology contributes to TDS variations by (84.1%), while the level of weathering affects pH variations by (71.4%). These findings confirm that geological factors play a dominant role in controlling the hydrogeochemical characteristics of river water through the process of mineral dissolution and ion release. Furthermore, the presence of sulfide minerals such as pyrite contributes to increased dissolved ions through natural oxidation processes. Furthermore, anthropogenic activities also contribute to variations in water quality. TDS (17–63 mg/L) and pH (6.6–7.9) indicate that the Auya River water quality remains within clean water quality standards. This study emphasizes the importance of geological aspects as a basis for water quality management in areas with high geological complexity.
Front matter JGEET Vol 11 No 01 2026 Adi Suryadi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

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Abstract

Back matter JGEET Vol 11 No 01 2026 Adi Suryadi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

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