PEMETAAN GEOHAZARD PADA DAERAH ALIRAN SUNGAI RAMBANGNIA KECAMATAN SIMPANG, KABUPATEN OKU SELATAN, SUMATERA SELATAN

LAMPASSA, M. EKKY HHYR and Setiawan, Budhi (2025) PEMETAAN GEOHAZARD PADA DAERAH ALIRAN SUNGAI RAMBANGNIA KECAMATAN SIMPANG, KABUPATEN OKU SELATAN, SUMATERA SELATAN. Undergraduate thesis, Sriwijaya University.

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Abstract

Geosite is a place that has high geological value because it is a witness to the geological history of the earth. Disasters are both natural and human-caused events that occur suddenly and have an impact on society. Watershed is a land area bounded by mountain ridges and is a place where rainwater is collected and stored and then channeled to the sea through the main river. The watershed functions as a place to receive rainwater, accommodate, store, and drain from the main river to the lake or sea. The research location is the Rambangnia River Watershed which is administratively located in Simpang District, South Ogan Komering Ulu, South Sumatra. In the study area there are 11 formations in sequence, namely the Tarap Formation, Garba Formation Situlanglang Member and Insu Member, Granite Formation, Kikim Formation, Talang Akar Formation, Baturaja Formation, Gumai Formation, Benakat Water Formation, Muara Enim Formation, Kasai Formation and Quarter Aluvium Formation and in the research area geomorphology is divided into 6 landforms namely alluvial plains, colluvial plains, peneplain, denudational hills, intrusion hills, and karst hills. This research aims to identify flood potential in the Rambangnia river basin using morphometric aspects. This research uses two parameters, namely primary and secondary. Primary data in the form of drone data taken at the research location and secondary data in the form of Digital Elevation Model data which is processed into several maps, namely bifurcation ratio, drainage density, ruggedness number, and stream frequency, then SHP data which produces output in the form of land cover maps, and Landsat 8 image data which produces NDVI (Normalized Difference Vegetation Index) and NDBI (Normalized Difference Built-up Index) map output. The morphometric parameters are normalized using the NMFI (Normalized Morphometric Flood Index) index which is then overlaid into one map, namely the map of potential flood vulnerability. Based on the results of the data processing, 3 levels of flood potential were obtained, namely low, medium, and high, marked in green, yellow, and red. The research area is dominated by moderate and low flood hazard levels marked with green and yellow colors. The low potential area has a percentage of 22.19%, the medium potential area has a percentage of 68.31%, and the high potential area has a percentage of 9.48%. Then the drone data taken at the research location is processed in the DJI Terra Plus software which will produce output in the form of a point cloud appearance. This point cloud shows the elevation in the research area, where in the research area there are higher elevations in the western part and lower elevations in the eastern part. This means that areas at higher elevations have a low potential for flooding and areas at lower elevations have a high potential for flooding.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Geosite, Geohazard, Banjir, Rambangnia, Multispektral
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA703-712 Engineering geology. Rock mechanics. Soil mechanics.Underground construction
Divisions:	03-Faculty of Engineering > 34201-Geological Engineering (S1)
Depositing User:	M. Ekky Hhyr Lampassa
Date Deposited:	13 Jan 2025 06:39
Last Modified:	13 Jan 2025 06:39
URI:	http://repository.unsri.ac.id/id/eprint/164375

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