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Bulletin of Geology
Published by Institut Teknologi Bandung
ISSN : 25800752     EISSN : 25800752     DOI : 10.5614/bull.geol.
Core Subject : Science, Engineering,
Earth & Planetary Sciences Energy Engineering
Bulletin of Geology is a research-based periodical scientific open access journal published by Faculty of Earth Sciences and Technology, Institut Teknologi Bandung (ITB). The published article in Bulletin of Geology covers all geoscience and technology fields including Geology, Geophysics, Geodesy, Meteorology, Oceanography, Petroleum, Mining, and Geography. The submitted abstract must be written in English and Bahasa Indonesia, but the article content is English or Bahasa Indonesia.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 5 Documents
 1 
Search results for , issue "Vol 3 No 3 (2019): Bulletin of Geology" : 5 Documents clear
HYDRODYNAMICS AND SEDIMENT CHARACTERISTICS ON A BATHYMETRICALLY-CONTROLLED RIP CHANNEL IN PANGANDARAN BEACH Hanif Santyabudhi Sutiyoso; Andi Egon
Bulletin of Geology Vol 3 No 3 (2019): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2019.3.3.5

Abstract

Rip currents are hydrodynamic events that form vary alongshore depend on local setting of its bathymetry feature and forcing. When it occurs, it is important to understand the process in order to prepare safety issues on recreational beaches. Bathymerically-controlled rips are the focus in this study, as this type is commonly found on Indonesia’s coastal areas, particularly in south coast of West Java. This unique hydrodynamics feature affects sediment characteristic, particularly at the rip channel as the lower part (far from shore) tends to have coarser sediment due to larger friction. Such complex interactions need thorough investigation; therefore, a study was conducted in Pangandaran which well-known for its rip currents. Field observation was made to collect sediment sample on cross shore direction which shows finer sediment on upper rip channel and coarser sediment on the lower part with diameter size of 0.35 mm and 0.37 mm, respectively. In addition, simple simulations were also made to illustrate rip current movement on a channel. The result shows that in the strongest current area with over than 3.0 m/s current speed, i.e. on the lower part of rip channel, bed shear stress is found to be the strongest. It is been noticed as well that the bed shear stress forms a pattern which delineate overall movement of a rip current. Furthermore, the variation of bed shear stress is revealed as the main cause of sediment distribution along the cross-shore direction. Therefore, this simple approach qualitatively illustrates the dynamics of rip current phenomenon.
KARAKTERISTIK REKAHAN ALAMI, STUDI KASUS MODEL SINGKAPAN DIGITAL (DOM) BATUAN GRANITIK DI MUARO SILOKEK, SUMATERA BARAT Wildan Tri Koesmawardani; M.E. Marshal Nurshal; Benyamin Sapiie; Alfend Rudyawan
Bulletin of Geology Vol 3 No 3 (2019): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2019.3.3.1

Abstract

Digital Outcrop Model (DOM) is a method of building a more realistic, 3D-based geocellular model based on photogrammetric data. DOM can describe position of fractures with a minimum length of four meters, so it can describe better distribution and fracture geometry with more precision. DOM used has a dimension of 320 m × 12 m at fractured granitic rock outcrops at Muaro Silokek, West Sumatra. There are 1183 fracture interpretations in the DOM. Based on the fracture orientation scattered in the DOM, there are four segmentation structures with three domain orientation directions, north north west - south southeast (NNE-SSW), northeast - southwest (NE-SW), and east-northeast - west southwest (ENE-WSW). The results of kinematic analysis of the structural data show that the Muaro Silokek area is affected by the strike slip fault with the northwest-southeast direction (NW_SE) which is parallel with orientation of the Takung Fault. Fracture density analysis in DOM was carried out by grid method with grid dimensions of 20 m × 20 m resulting in a value range of 0.15 - 1 fracture/m2. From the results of the fracture density analysis, the kinematic analysis can be carried out to determine the minor fault orientation. Fracture density is strongly influenced by the distance to fault and has logarithmic distribution data with a high correlation coefficient R2 = 0.98.
GEOLOGI DAN SUMBERDAYA BATUBARA DAERAH SATIUNG – KUALA KUAYAN DAN SEKITARNYA, KABUPATEN KOTAWARINGIN TIMUR, PROVINSI KALIMANTAN TENGAH Yan Rizal; Muhammad Agung Akrom Fahmi; Hamzal Imanul Haq
Bulletin of Geology Vol 3 No 3 (2019): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2019.3.3.2

Abstract

Geological mapping on a scale of 1:25.000 was held in Satiung – Kuala Kuayan and its surrounding, East Kotawaringin, CentralKalimantan. The goal of this study is to identify the geological setting and coal potential in the research area. Primary data used in this research obtained from field observation and field data collection, such as outcrop data and drilling data. The stratigraphy of research area is divided into three unofficial units from the oldest to the youngest: Basement (Mesozoic), Dahor Formation (Pliocene – Pleistocene) and Alluvial. Coal quality of the study area shows lignite to sub-bituminous rank, with total resources is 291.737.730,9 Ton (measured 95.928.991,0 Ton and indicated 195.808.739,9 Ton).
TEKNIK PENDETEKSIAN ZONA MATA AIR PANAS GEOTERMAL MENGGUNAKAN CITRA SATELIT MULTISENSOR DAN OBSERVASI LAPANGAN Lazuardy Fajar Pratama Sulaeman; Asep Saepuloh; Permana Adhitya Lano
Bulletin of Geology Vol 3 No 3 (2019): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2019.3.3.3

Abstract

Geothermal exploration activities in a very large area require a lot of time and manpower. A mapping technique can be used to minimize time and manpower at field by optimizing the use of remote sensing technology. This paper is aimed to identify the availability of geothermal hot springs zones using multisensory images from Landsat-8 Advanced Land Imager (OLI), Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Thermal Infrared Radiometer (TIR), and Synthetic Aperture Radar (SAR) of Sentinel-1. The imagery data were prepared and used according to their respective uses, and then they will be verified by field geological data including location of hot springs and geological structures. Baolan Subdistrict and Galang Subdistrict, Tolitoli District, Central Sulawesi Province was selected as study area to obtain the effectiveness of multisensory technique under thick vegetation cover and limited access. The geological mapping area was focused in the south of Tolitoli City with coverage area about 50 km2. Surface thermal anomaly detection was performed using ASTER TIR by calculating the Land Surface Temperature (LST) and combined with wetness detection using Landsat-8 OLI. In addition, the Sentinel-1 images were used to detect lineament related to geological structures on the surface served as fluid path flows from sub-surface to surface. Ground truthing was performed by mapping hot springs at field and served as verification to the remote sensing results. Then, geological interpretation of geothermal system availability under the study area was performed. The multisensory image analyses verified by field mapping of the hot springs zone showed high effectivity to localize the possible area for surface manifestations. Meanwhile, the lineament related to geological structures based on Sentinel-1 image detected successfully a sinistral strike slip and sinistral normal faults. Accordingly, the geothermal manifestation in the study area was a discharge zone presented by the existence of hot springs and strike-slip faults acted as fractures permeability
MIDDLE MIOCENE BIOSTRATIGRAPHY AND PALEO-OCEANOGRAPHY OF SUPIORI ISLAND, PAPUA BASED ON CALCAREOUS NANNOFOSIL ASSEMBLAGES Ryan Dwi Wahyu Ardi; Nadila Novandaru; Istiana Istiana; Alviyanda Alviyanda; Rubiyanto Kapid; G.M. Lucky Junursyah; Rahmat Y Saragih
Bulletin of Geology Vol 3 No 3 (2019): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2019.3.3.4

Abstract

Calcareous nannofossil assemblages have been analysed from three stratigraphic sections on Supiori Island to determine biozonation and paleo-oceanographic condition. Based on Neogene Calcareous Nannofossils Zonation (Martini, 1971), section BK 78 (Wainukendi Formation) classified into three zones, which coeval to NN7–NN9 and or younger (Middle Miocene). Section BK 95 (Napisendi Formation) categorised into five zones, which equivalent to NN5–NN9 (Middle Miocene), and section BK 98 (Wafordori Formation) is considered to be equivalent to NN7 (Middle Miocene). Those results indicate a correlatable interval (NN7) and an interfinger contact between Wainukendi, Wafordori, and Napisendi Formations. Paleo-oceanographic parameters namely thermocline/nutricline depth and paleosalinity were analysed in this research. Thermocline/nutricline depth analysis from Discoaster abundance and mean coccolith size of Reticulofenestra and Coccolithus indicate sea surface condition changes from oligotrophic (NN5–NN7) to eutrophic (early NN8) and then again into oligotrophic (from late NN8 to NN9). Paleosalinity analysis based on abundance comparison between Sphenolithus neoabies, Helicosphaera carteri, and Calcidiscus leptoporus denotes paleosalinity shift from normal saline (NN7) to hyposaline condition (NN8 – NN9). Those paleo-oceanographic parameters changes most likely related to the closing of Indonesian Seaway due to regional uplift, which triggered the formation of proto West Pacific Warm Pool (WPWP), Equatorial Under Current (EUC), and eventually a La Nina-like condition on late Middle Miocene (NN8–NN9).

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