Budiharso, Agus Santoso
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GEOLOGI DAERAH PALAES DAN SEKITARNYA KECAMATAN LIKUPANG BARAT, KABUPATEN MINAHASA UTARA, SULAWESI UTARA KADIR, ALVYUS; Budiharso, Agus Santoso; Rachmadhan, H.D.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 3 No 1 (2025): Journal Geological Processes, Risk and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

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This research aims to analyze the geological conditions of the Palaes area and its surroundings in West Likupang District, North Minahasa Regency, North Sulawesi. The study covers an area of approximately 16 km², administratively including the villages of Palaes, Lansa, Lantung, Kulu, and Warisa. The research method involves surface geological mapping at a scale of 1:10,000, including geomorphological observation, lithological analysis, structural measurement, and petrographic analysis. Data were processed using the Dips software and spatial analysis based on DEMNAS to interpret morphological lineaments. The results show that the geomorphology of the study area consists of six landform units formed by three main genetic processes: structural, denudational, and fluvial. The stratigraphy comprises four lithological units: the Palaes Sandstone Unit, the Palaes Breccia Unit, the Lansa Andesitic Lava Unit, and the Alluvial Unit. Structural data indicate dominant lineaments trending northwest–southeast, interpreted as normal faults, evidenced by geomorphic features such as waterfalls and straight valleys. The geological history reflects a sequence of sedimentation and volcanic activity, followed by tectonic processes that shaped the major geological structures of the region. This research produced a geological map, a geomorphological map, and a stratigraphic column that serve as a scientific basis for geological resource exploration, hazard assessment, and land-use planning based on local geological characteristics.
KAJIAN TOPOGRAPHIC WETNESS INDEX (TWI) UNTUK MENGETAHUI POTENSI BAHAYA BANJIR DI KOTA MANADO Budiharso, Agus Santoso; Momongan, Andrew J.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 1 No 01 (2023): Journal Geological Processes, Risks, and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

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ABSTRACT Floods in Manado City from 2000 to 2023 have continued to expand, in line with the increasing population and infrastructure development. To address future flood occurrences, it is necessary to conduct research on various flood causes, including rainfall, topographical factors, urban hydrological/drainage conditions, and others. This study employs the Topographic Wetness Index (TWI) approach, aided by Geographic Information System (GIS) analysis. The research results in the distribution of TWI, where high TWI values indicate areas with high soil moisture and a greater potential for surface water flow during rainfall, making them vulnerable to flooding. The overlay results of TWI in the high category with all flood-affected areas from 2011 to 2023 indicate that approximately 64.51% of them have high TWI values. Similarly, the overlay between buildings and TWI shows that 70,414 buildings are located in high TWI areas. Therefore, the research findings indicate a strong correlation between high TWI values and areas susceptible to flooding. High TWI values indicate high soil moisture and a greater potential for surface water flow during rainfall. Keywords: Manado City Flood, Topographic Wetness Index, Geographic Information System.
GEOLOGI DAERAH MINAWEROT DAN SEKITARNYA, KECAMATAN KAUDITAN, KABUPATEN MINAHASA UTARA, SULAWESI UTARA Luntungan, Paskah Richo; Budiharso, Agus Santoso; Rachmadhan, H.D.
Journal Geological Processes, Risks, and Integrated Spatial Modeling Vol 2 No 2 (2024): Journal Geological Processes, Risk and Integrated Spatial Modeling
Publisher : LPPM Universitas PRISMA

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The research location is administratively in North Sulawesi Province, precisely in Kaima Village, Lembean Village, Kaasar Village and Treman Village, Kauditan District, North Minahasa Regency. It is located at the coordinates of 1°16'0"N to 1°17'45"N and 125°01'15"E to 125°03'15"E with an area of 16 km². Along with the improvement of technology and science about the earth along with the increase in the important role of geological maps, the existing updates to the geological map of Minawerot Region, Kauditan District, North Minahasa Regency, North Sulawesi Province with a larger scale of 1:10,000 meals will be able to produce more detailed geological maps to support exploration activities and development programs in the region. In this study, the researcher will identify the geological conditions that develop in the research area which include geomorphological aspects, stratigraphic aspects, geological structure aspects, and geological history aspects so as to produce geological maps, geomorphological maps and stratigraphic columns in the research area. The research method used is a field survey by directly observing the surface geological conditions in the research area which includes geomorphology, stratigraphy and geological structures. The geomorphology of the research area consists of 6 geomorphological units, namely Dissected Volcanic Hills, Volcanic Fluvial Plains, Volcanic Foothills, Eroded Hills, Volcanic Foothills and Lakes. The stratigraphy that developed in the research area consisted of the oldest to the youngest units, namely the Karegesan Andesite Igneous Rock Unit, the Kaima Tuff Breksi Unit, the Tuff Treman Breksi Repeating Unit, the Kaasar Lapili Tuff Unit and the Aluvial Unit. The structure in the research area is only obtained from primary geological structures. After pulling the straightness of the ridge and valley through the DEMNAS, the dominant direction was found, namely the Northwest and Southeast. The geological history that occurred in the research area began with the formation of the Karegesan Andesite Igneous Rock Unit, which was then continued with the deposition of the Tuff Kaima Breksi Unit and then the Tuff Kaima Breksi Repeating Unit. Then it was continued with the deposition of the Kaasar Lapili Tuff Unit and the last one was deposited the Aluvial Unit in the form of loose sediment