Perhitungan dilakukan untuk menganalisis potensi energi air hingga estimasi energi daya yang dihasilkan. PLTMH Pulau Timun mengoptimalkan debit aliran 2,55 m 3 /s dari lebar Sungai Air Mannaijau yang mencapai 7,5 m serta kedalamn sungai rata-rata 0,38 m. Berdasarkan data pengukuran hidrografi dan topografi tersebut, maka Sungai Air Mannaijau diestimasikan mampu mewujudkan potensi daya total pembangkit listrik sebesar 87,46 kW.
Digital Elevation Model (DEM) is a representation of the actual landform based on elevation. DEM is part of the technological sophistication that is very helpful in planning, mapping, and surveying. This study applies DEM, which is constructed from DEMNAS, focusing on DEM optimization for geological structures identification.The applied method is ellipsoid stress model analysis approach to determine the type of structure. The scope of this study is located in North Manna Sub-Basin, tectonically is a basin that formed on Paleogen by an extensional force that forms half-graben along the Bengkulu Shelf. Interpretation of DEM in the study area showed the existence of 10 lineament patterns of NE-SW and five NNE-SSW patterns, controlled by normal fault, nine lineament patterns of NW-SE and six WNW-ESE patterns, controlled by a thrust fault and fold. Field observation using direct measurement method obtained by four faults with NE-SW and NNE-SSW pattern, one fault and four folds with NW-SE pattern,three faults and two folds with WNW-ESE trending pattern. This indicates that the accuracy level of DEM in the study area reaches 90%. The geological structure that is still active, certainly requires special attention in building construction.
Muara Enim Formation is well known as coal-bearing formation in South Sumatra Basin. As coal-bearing formation, this formation was subjects of many integrated study. Muara Enim Formation can be divided into four coal-seam group, M1, M2, M3, and M4. The M2 group comprising of Petai (C), Suban (B), Lower Mangus (A2), and Upper Mangus (A1). Depositional environments of Group M2 is transitional lower delta plain with sub-depositional are crevasse splay and distributary channel. The differentiation of both sub-depositional environments can be caused the quality of coal deposit. One of quality aspects is ash content. This research conducted hopefully can give better understanding of relationship between depositional environments to ash content. Group M2 on research area were found only Seam C, Seam B, and Seam A2, that has distribution from north to central so long as 1400 m. Coal-seam thickness C ranged between 3.25-9.25 m, Seam B range 7.54-13.43 m, and Seam C range 1.53-8.37 m, where all of coal-seams thickening on the central part and thinningsplitting to northern part and southern part. The ash content is formed from burning coal residue material. Ash contents on coal seam caused by organic and inorganic compound which resulted from mixing modified material on surrounded when transportation, sedimentation, and coalification process. There are 27 sample, consists of 9 sample from Seam C, 8 sample from Seam B, and 10 sample from Seam A2. Space grid of sampling is 100-150 m. Ash content influenced by many factors, but in research area, main factor is existence of inorganic parting. Average ash content of Seam C is 6,04%, Seam B is 5,05%, and Seam A2 is 3,8%. Low ash content influenced by settle environment with minor detrital material. High ash content caused by oxidation and erosional process when coalification process. Ash content on coal in research area originated from detritus material carried by channel system into brackish area or originated from higher plant in brackish area. The high ash content also can be caused by after the coal deposited. It had originated from overburden horizon which infill in cleat of coal seam.
SARI Daerah Sukomoro merupakan daerah yang termasuk ke dalam Formasi Palembang Tengah pada Cekungan Sumatera Selatan. Formasi ini dikenal dengan batuan yang terbentuk pada proses pasang-surut air laut. Bukti terjadinya pasang-surut air laut dapat dijumpai oleh kehadiran batugamping yang menjadi indikasi lingkungan pengendapan daerah neritik (laut dangkal) serta dijumpai amber (getah pohon) dengan jarak relatif dekat (± 1km). Berdasarkan analisa paleontologi, tidak dijumpai hadirnya fosil foraminifera pada sampel batugamping. Hal ini semakin menguatkan indikasi lingkungan pengendapan transisi pada daerah penelitian. Berdasarkan hasil analisa fosil pollen dijumpai indikasi kehadiran tumbuhan yang bervariasi mulai dari kelompok gymnospermae (tumbuhan berbiji terbuka hadir pada lingkungan darat), angiospermae (tumbuhan berbiji tertutup hadir pada lingkungan darat) dan pteridopytha (tumbuhan paku-pakuan hadir pada lingkungan darat yang berair) hingga mangrove (tumbuhan penciri daerah rawa). Dengan kehadiran variasi fosil-fosil tersebut, maka diinterpretasikan bahwa lingkungan pengendapannya adalah transisi terutama pada lingkungan intertidal (Henrich, 2007 dalam Mayasari, 2016). Lingkungan pengendapan ini dicirikan oleh morfologi dengan kemiringan lereng yang landai.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.