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All Journal Jurnal Matematika & Sains Science and Technology Indonesia Jurnal Penelitian Sains Jurnal Locus Penelitian dan Pengabdian Makara Journal of Science
Wijaya Mardiansyah, Wijaya
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Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics

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Journal : Science and Technology Indonesia

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An Updated Water Masses Stratification of Indonesian Maritime Continent (IMC) Attributed to Normal and ENSO Conditions by Argo Float Bahiyah, Amirotul; Wirasatriya, Anindya; Mardiansyah, Wijaya; Iskandar, Iskhaq
Science and Technology Indonesia Vol. 9 No. 2 (2024): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.2.299-313

Abstract

The tropical area of the Indonesian Maritime Continent (IMC) is frequently regulated by El Niño Southern Oscillation (ENSO), resulting in various water mass stratification in every climate event, such as El Niño and La Niña occurrences. As a consequence, changes in the typical Indonesian Throughflow (ITF) are linked to ENSO circumstances that affect the Indian Ocean. This study used Argo float data to evaluate the change in water mass stratification and vertical density profiles along the main pathway of ITF at each event. However, due to a scarcity of observation data, the comparison study of normal to ENSO occurrences has been limited in the ITF area. In typical circumstances throughout the year, the entrance channel (the western Pacific Ocean, the northern waters of Molucca Island, and the Halmahera Sea) had a higher saline value and cooler water masses than other ITF channels, with a range of roughly 33.5 - 35.5 PSU/13 - 22 ◦C, particularly during the Northwest (NW) Monsoon (December to February or DJF). Unlike the inlet, the Temperature-Salinity (T-S) diagram showed a declining value in both parameters (Celebes Sea, Makassar Strait, and Molucca Sea). Still, the outflow pathway in the Southeastern Tropical Indian Ocean (SETIO) showed a rising T-S diagram. During La Niña events, IMC water masses are often portrayed as fresher and warmer, while reverse circumstances are depicted in El Niño events with exclusion at SETIO station, indicating saltier and colder water masses than normal conditions. An extreme alteration with a large T-S range is mostly depicted in Makassar Strait from Southeast (SE) monsoon (September to November or SON) to NW monsoon, followed by the Banda Sea and then the Molucca Sea.
Spatial Data Integration and Validation for Peatland Fire Risk Mapping in Ogan Ilir District, South Sumatra Province Sutopo; Saputra, Agus Dwi; Irfan, Muhammad; Mardiansyah, Wijaya; Iskandar, Iskhaq
Science and Technology Indonesia Vol. 11 No. 1 (2026): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2026.11.1.288-297

Abstract

This study aims to map peatland fire vulnerability in Ogan Ilir District, South Sumatra, using a GIS-based spatial data integration approach. The analysis integrates biophysical factors, including soil type, land cover, topography, and rainfall, with anthropogenic variables such as accessibility to roads, settlements, and rivers. A multi-criteria scoring and weighting method was applied to generate the vulnerability map, which was validated using hotspot data from 2019 to 2024. Previous studies in Ogan Ilir primarily focused on fire-potential mapping using simple scoring and overlay techniques without standardized validation. To address this limitation, this study adopts the official methodology outlined in Technical Guidelines No. P.6/PSKL/SET/KUM.1/5/2020 issued by the Ministry of Environment and Forestry and incorporates fire spot data from the Regional Disaster Management Agency (BPBD) for validation. Results show that high-vulnerability areas (Score 3–4) dominate the district, covering 222,855.3 hectares or 90.7% of the total mapped area. Validation indicates that 83.8% of actual hotspots occur within these zones, supported by a kappa accuracy value of 0.8628, reflecting strong model reliability. Key factors influencing vulnerability include land cover dominated by shrubs, swamps, and plantations such as oil palm and rubber; the predominance of Hemic Organosol soils; and low rainfall, especially in southern areas. These findings align with studies across Sumatra highlighting the influence of drained vegetation, accessibility, and human activities on peatland fire susceptibility. Overall, this study provides essential spatial information to support targeted peatland fire mitigation, including enhanced monitoring, strict no-burn policies, and improved water-management practices to maintain sustainable peat moisture.
Co-Authors Agus Dwi Saputra, Agus Dwi Anindya Wirasatriya Bahiyah, Amirotul Dedi Setiabudidaya Fitra, Mahturai Rian Iskhaq Iskandar Muhammad Irfan Mulya, Aldi Jati Nur khakim, Mokhamad Yusup Putranto, Dinar DA. Rujito Agus Suwignyo SUTOPO