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All Journal Buletin Sumber Daya Geologi Jurnal Geominerba
Nana Sulaksana
Departemen Geologi Terapan, Fakultas Teknik Geologi, Universitas Padjadjaran
Earth & Planetary Sciences Education Energy Engineering Environmental Science Other

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Journal : Jurnal Geominerba

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KARAKTERISTIK MORFOMETRI DAS CITARIK HULU DAN IMPLIKASINYA TERHADAP POTENSI BANJIR Pradnya Paramarta Raditya Rendra; Nana Sulaksana
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 6 No 1 (2021): Jurnal Geominerba - 2021
Publisher : PPSDM Geominerba

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Abstract

The research area is the Upper Citarik Sub Watershed which is located at 107°49’18,1” E-107°57’27,4” E and 6°55’15.7” S-6°59’34.7” S in the Bandung, Sumedang, and Garut Regency. The research aims to identify the morphometric characteristics of the Upper Citarik Sub Watershed and its implication to the flood potential. The research was conducted through studio analysis using thematic maps such as slope and geological map. Several aspects of the watershed morphometry are used to determine the characteristics of the Upper Citarik Sub Watershed, namely linear aspect (stream order, stream length, mean stream length, stream length ratio, bifurcation ratio, mean bifurcation ratio); areal aspect (drainage density, stream frequency, drainage texture, form factor, circularity ratio, elongation ratio, length of overland flow), and relief aspect (total basin relief, relief ratio). The results showed that the Upper Citarik Watershed consists of 17 Sub Watersheds. In general, all of the sub watersheds have an elongated watershed shape at high relief and relatively steep slope, volcanic rocks composition, and a slow rise in flooding. It indicates that the research area has relatively high resistance to potential flooding. As a catchment area in the Upper Citarum Watershed, it is better if the Upper Citarik Watershed is maintained in order to avoid various natural damages. Therefore, the condition of the Upper Citarik Sub Watershed requires sustainable conservation so that environmental damage does not occur which results in various disasters such as floods, landslides, and others.
HUBUNGAN KARAKTERISTIK INDEKS GEOMORFIK TERHADAP KEMUNCULAN MANIFESTASI PANAS BUMI DI DAERAH NOKILALAKI Muhammad Hudzaifah; Nana Sulaksana; Dewi Gentana
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 6 No 2 (2021): Jurnal Geominerba - 2021
Publisher : PPSDM Geominerba

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Abstract

The appearance of geothermal manifestations in the Nokilalaki area is related to the morphology and geological structure which is influenced by the tectonic activity of the Palu - Koro segment. The study of geomorphic index through the calculation of river branching ratio (Rb), mountain face sinusitis (Smf), valley bottom width ratio - height (Vf) and lineament density (Ld) to determine the relationship of geomorphic index characteristics to the appearance of geothermal manifestations. The research method is remote sensing analysis and geomorphic index analysis on the Indonesian Topographical Map (RBI) and ASTER – DEM images to obtain the main pattern of geological lineaments and geomorphic index values. The value of the geomorphic index describes the level of tectonic activity and permeability in rocks, which plays a role in generating geothermal fluid from a geothermal system at depth to the surface. Based on the combination of geological lineament maps, geomorphic index maps and distribution of geothermal manifestations, the study area has two groups of geothermal manifestations. The area with the main pattern of geological lineament trending northwest – southeast is an area that is not deformed (Rb value: 4.55), active tectonic activity (Smf value: 1.34 – 1.53), high uplift (Vf value: 0.47), low lineament density (Ld value: 0.49 – 0.91), is associated with the appearance of geothermal manifestation groups in the depression edge of the Palu - Koro fault segment in the center of the study area. The main patterned area of ​​the north- northeast-south-southwest geological lineament is a non-deformed area (Rb value: 4, 20), active tectonic activity (Smf value: 1.47), high uplift (Vf value: 0, 22), medium to high lineament density (Ld value: 1.37 – 2.75), associated with the emergence of groups of geothermal manifestations in the hilly area of ​​the edge of the Palu - Koro fault segment in the southwest part of the study area.
ZONASI PERGERAKAN TANAH DI DESA PANYUTRAN DAN SEKITARNYA, KECAMATAN PADAHERANG, KABUPATEN PANGANDARAN, PROVINSI JAWA BARAT Jhon Pengarapen Barus; Nana Sulaksana; Zufialdi Zakaria
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 7 No 1 (2022): Jurnal Geominerba 2022
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1013.482 KB) | DOI: 10.58522/ppsdm22.v7i1.54

Abstract

The research area located in Panyutran Village and its surroundings are areas whose surface is covered by Tertiary-aged rocks. In the study area, the constituent rock types are volcanic breccia, tuff and limestone. The method of studio analysis approach with remote sensing is the lineament analisys, lineament structure, slope, rock strength, mountain front sinuosity (Smf), and the ratio of the width of the valley floor to the height of the valley (Vf). The results of the analysis of these aspects indicate that the research area has an area with high or unstable ground movement susceptibility 2.3%, medium tectonic activity vulnerability 86.3% and low or stable ground movement vulnerability 11.4%. The results of the morphotectonic analysis show that the research area has medium tectonic activity.
Co-Authors Dewi Gentana Dewi Gentana Emi Sukiyah Euis Tintin Yuningsih Jhon Pengarapen Barus Muhammad Hudzaifah Pradnya Paramarta Raditya Rendra Zufialdi Zakaria