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Arifin, Yayu
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Geomorfologi Daerah Mananggu dan Sekitarnya, Kecamatan Mananggu, Kabupaten Boalemo, Provinsi Gorontalo Kayambo, Muhammad Ridho; Arifin, Yayu; Akase, Noviar; Uno, Djamal Adi Nugroho
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Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jrpi.v3i1.36273

Abstract

This research was conducted in the Mananggu area and its surroundings, Mananggu District, Boalemo Regency, Gorontalo Province. The study aims to map the geological conditions and identify the characteristics of geomorphology and geological structures developed in the area. The methods employed included surface geological mapping for field data collection, followed by laboratory analyses. Geomorphologically, the research area is divided into two units: the Volcanic Hills Unit and the Structural Hills Unit. The stratigraphy consists of the Eocene-Oligocene Porphyritic Andesite Unit (Tinombo Formation) and the Pliocene Granite Unit (Bumbulan Granodiorite Formation) acting as an intrusive body. The geological structures are controlled by a transtensional regime resulting from compression, manifested as NW-SE shear joints, right normal slip faults, and normal right slip faults. The landscape evolution is strongly influenced by the interplay between the resistance of the igneous lithologies and the active tectonic deformation that shapes the drainage patterns and slope configurations.
Analisis Geomorfologi Daerah Pesisir Desa Biluhu Timur, Kecamatan Batudaa Pantai, Gorontalo Mamonto, Amelia; Arifin, Yayu; Marina, Siti
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Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jrpi.v3i1.35975

Abstract

This study aims to investigate the geomorphological characteristics of Biluhu Timur Village, Batudaa Pantai District, Gorontalo. The analysis was carried out using National Digital Elevation Model data, topographic maps, and spatial processing through Geographic Information Systems to produce slope-gradient maps, morphographic classifications, drainage patterns, and geomorphological units. The study area is composed of igneous rock lithologies, namely granite and dacite, as well as limestone of the wackestone type. The results show that the area exhibits an elevation range from –5 to 340 meters, forming four morphographic classes and five slope-gradient classes, dominated by very steep zones with high susceptibility to erosion and landslides. The drainage patterns identified in the area include parallel and dendritic patterns, with valley development ranging from youthful “V-shaped” forms to mature “U-shaped” forms. Based on the analysis and field validation, three principal geomorphological units were delineated: the Lava Flow Ridge Unit, the Denudational Hill Unit, and the Coastal Plain Unit. These findings provide essential baseline information for land-use planning, disaster mitigation, and sustainable regional management.
Co-Authors Djamal Adi Nugroho Uno Kayambo, Muhammad Ridho Mamonto, Amelia Marina, Siti Noviar Akase