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Harnani Harnani
Jurusan Teknik Geologi, Universitas Sriwijaya
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GIS-Based Landslide Susceptibility Mapping Using Weighted Overlay in Ogan Komering Ulu Juliansyah, Ilham Rahmat; Harnani, Harnani; Nurohim, Dede
Jambura Geoscience Review Vol 8, No 1 (2026): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v8i1.36391

Abstract

Landslides pose a major hazard in Ogan Komering Ulu Regency, South Sumatra, where rugged relief, high rainfall, and land-use change can reduce slope stability. This study develops a GIS-based landslide susceptibility map using the weighted overlay method to support disaster mitigation and spatial planning. Five conditioning factors—slope, rainfall, geology, soil type, and land use—were prepared as thematic layers from DEMNAS topography, CHIRPS rainfall estimates interpolated using Inverse Distance Weighting, geological shapefiles from Ina-Geoportal, soil information from the FAO–UNESCO Digital Soil Map of the World, and land-cover data from the Indonesian Base Map (RBI). Each factor was reclassified into susceptibility classes, assigned scores, and weighted according to its relative influence on landslide occurrence, then integrated through overlay analysis to produce a composite susceptibility index. The index was classified into low, moderate, and high susceptibility zones. The results indicate that moderate susceptibility dominates most of the study area, while high-susceptibility zones are concentrated in hilly to mountainous terrains with steep slopes and unfavorable geological and soil conditions. Model performance, evaluated using a landslide inventory and the Receiver Operating Characteristic curve, produced an Area Under the Curve value of 0.715, indicating moderate predictive accuracy. The susceptibility map provides actionable spatial information to prioritize monitoring and guide land-use management in Ogan Komering Ulu.
Co-Authors Abiyyu, Muhammad Dimas Al Abiyyu, Rayhan Khairunnan Ananda, Ricky Annafin , Faiz Hady Aulia, Zhahra Budhi Setiawan Budhi Setiawan Dieny Dezilia Dimas Indra Arifianto Edy Sutriyono Elisabet Dwi Mayasari Ferdian Syahputra Gumanti, Johnnedy Gunawan, M. F. Hafizh Fikra Ramadhan Idarwati Idarwati Juliansyah, Ilham Rahmat Khoiri, Muhammad Faris Mochammad Malik Ibrahim Muhammad Sidiq Nurohim, Dede Nyana M, Newche Brighita Pebby Putra Juenda Prihandayani, Anggun Putri Savira Putricia, Innaka Qistan, Muhammad Hafits Sabila, Dona Salni Stevanus Nalendra Jati Thallalefa, Muhammad Daffa Utamaputra, Radian Gatra Yogie Zulkurnia Rochmana