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All Journal Geosfera: Jurnal Penelitian Geografi
Budhi Setiawan
Program Studi Teknik Geologi, Fakultas Teknik, Universitas Sriwijaya
Earth & Planetary Sciences Education Environmental Science Social Sciences

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Analisis Morfometri DAS untuk Pemetaan Kerawanan Banjir Bandang di Kecamatan Runjung Agung, Kabupaten Ogan Komering Ulu Selatan Egi Saputra; Budhi Setiawan; Dede Nurohim
Geosfera: Jurnal Penelitian Geografi Vol 5, No 1 (2026): Geosfera : Jurnal Penelitian Geografi
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/geojpg.v5i1.38607

Abstract

South Ogan Komering Ulu Regency is characterized by complex topography and well-developed drainage networks that may increase flash flood susceptibility. Although morphometric analysis has been widely applied in hydrological studies, the integration of linear, relief, and areal morphometric parameters for flash flood susceptibility mapping in Runjung Agung District remains limited. This study aims to analyze watershed morphometric characteristics and map flash flood susceptibility in Runjung Agung District and its surrounding areas. The analysis was conducted using Digital Elevation Model (DEM) data within a Geographic Information System (GIS) environment through the calculation of 15 morphometric parameters representing linear, relief, and areal characteristics. All parameters were normalized into a 0–1 index and integrated using the Cell Statistics method to generate a flash flood susceptibility map. The results indicate that high-susceptibility zones are concentrated in the central, northeastern, southwestern, and southeastern parts of the study area, particularly around Tanjung Kurung, Runjung Agung, Saung Naga, Simpang Saga, Kota Karang, and Negeri Batin. These areas are characterized by dense drainage networks, short overland flow lengths, and relatively high relief conditions. The findings demonstrate that DEM-based morphometric analysis provides an effective approach for identifying flash flood-prone areas and supporting disaster mitigation planning.
Pemetaan Kerawanan Longsor Berbasis Sistem Informasi Geografis pada Daerah Kikim Selatan, Kabupaten Lahat, Sumatera Selatan Wulandari Wulandari; Budhi Setiawan; Dede Nurohim
Geosfera: Jurnal Penelitian Geografi Vol 5, No 1 (2026): Geosfera : Jurnal Penelitian Geografi
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/geojpg.v5i1.38967

Abstract

The South Kikim Area, South Sumatra, is characterized by hilly terrain, weathered sedimentary lithology, steep slopes, and geological structures that may increase landslide susceptibility. These conditions highlight the need for spatial information on landslide-prone areas to support disaster mitigation and regional planning. This study aims to map landslide susceptibility and identify the controlling factors in the South Kikim Area. The analysis employed a Geographic Information System (GIS)-based weighted scoring method by integrating geological conditions, slope gradient, soil type, and land cover parameters. Each parameter was assigned a score and weight according to its contribution to slope instability and then analyzed through spatial overlay techniques to produce a landslide susceptibility map. The results indicate that the study area of 8,057.58 ha is classified into three susceptibility levels: low susceptibility covering 48.40 ha (0.60%), moderate susceptibility covering 7,064.09 ha (87.67%), and high susceptibility covering 945.10 ha (11.73%). High-susceptibility zones are concentrated in the southern part of the study area, particularly in Pseksu District, and are associated with calcareous shale, weathered claystone, and steep to very steep slopes. Lithology and slope gradient were identified as the dominant factors controlling landslide susceptibility distribution. The resulting susceptibility map can serve as a reference for disaster mitigation and spatial planning in the study area.
Co-Authors Dede Nurohim Egi Saputra Wulandari Wulandari