International Journal of Multidisciplinary Research and Publications ISSN (Online): 2581-6187 77 Muhammad Tafakur Subagio, Iyan Haryanto, Dewi Gentana, and Boy Yoseph C.S.S.Syah Alam, “Geomorphic Indices Characteristics Related to Geothermal Manifestation Appearance and 3D Modelling Micromine Software in Wayang Windu Geothermal Field,” International Journal of Multidisciplinary Research and Publications (IJMRAP), Volume 5, Issue 8, pp. 77-82, 2023. Geomorphic Indices Characteristics Related to Geothermal Manifestation Appearance and 3D Modelling Micromine Software in Wayang Windu Geothermal Field Muhammad Tafakur Subagio 1 , Iyan Haryanto 1 , Dewi Gentana 1 , Boy Yoseph C.S.S.Syah Alam 1 1 Geological Engineering Faculty, Padjadjaran University, Jatinangor, Indonesia Email address: muhammad18321@mail.unpad.ac.id Abstract— The research site is administratively located in Bandung Regency, West Java Province. This area had a unique morphology forming a horseshoe composed of Quaternary volcanic rocks which is a geothermal field. This study aimed to discover the relationship between geomorphic index characteristics to the geothermal manifestation appearance in the research site through 3D modelling using micromine software. The results of the geological lineament analysis were interpreted as geological structures trending west-east (W-E), northwest-southeast (NW-SE) and northeast-southwest (NE- SW). Geomorphic index characteristics showing active tectonic class (Smf value: 1,34 – 1,99) and medium (Smf value: 2,06 – 2,41), medium lineament density (Ld value: 1,013 – 1,229 km/km²), and height (Ld value: 1,229 – 1,900 km/km²). 3D modeling using micromine software clearly showed the continuity of geological structures on the surface to the subsurface. The accumulation facilitated geothermal fluids from beneath the surface to move and emerge on the surface as geothermal manifestations. The spread of geothermal manifestations can be divided into three groups, which are: TKR-1 group (Sub- watershed CTR-2, CTR-4, CLK-3, and CLK-4). TKR-2 group (sub- watershed CTR-3, CLK1, and CLK-2), TKR-3 group (sub- watershed CTR-1 and CLK-5). Keywords— Geological Lineament, Geomorphic Indices, Geothermal Mantifestations, Micromine, Wayang Windu. I. INTRODUCTION West Java is a province which produces the largest geothermal energy with six existing PLTPs, in the amount of 1194 Mega Watt (MW) from 2130,7 MW or 56% of the electricity from existing PLTPs in Indonesia. According to the national geothermal road map, in 2025 around 39,5% of its development is located in West Java. The total potential of geothermal resources is 2159 MW and the total potential of reserves is 3765 MW, and the total of both are 5924 MW (Mahlia, 2016). One of the geothermal fields in West Java which has been operating is the Wayang Windu geothermal field. This field is a geothermal producer that has contributed 227 MW of geothermal energy with unit 1 producing 110 MW and unit 2 producing 117 MW. The two generating units are supported by a number of production wells (Star Energy Geothermal, 2022). A quantitative approach by calculating several geomorphic indices (morphotectonic) variables in a watershed on the data from geological and topographic lineament analysis. The analysis results of the Geomorphic Indices value are able to determine its relationship to the geothermal manifestations appearance in the Wayang Windu geothermal field (Fig 1) and visualized in three dimensions (3D) by applying the Micromine software, so that it can visualize the relationship between the Geomorphic Indices characteristics and the geothermal manifestations appearance which are also related to the presence of wells in the research site. Fig. 1. Research area located on Bandung Regency, West Java province, Indonesia. II. METHOD This study was carried out in several stages, such as preparatory stage, inventory of data related to research objects consisting of geology and geomorphology aspects, as well as information about watersheds in the research site. Zoning the watershed into several sub-watersheds was also conducted in order to analyze its morphotectonic aspects. The data tabulation and analysis were related to the geological structure lineament and the morphotectonic aspects of watersheds such as the mountain front sinuosity (Smf) and the lineament density (Ld). A. Structure Lineament