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All Journal Bulletin of Scientific Contribution : Geology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Teknologi Indonesia
Edi Prasetyo Utomo, Edi Prasetyo
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Environmental Science

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LANDSLIDE HAZARD ASSESMENT ON JAVA ISLAND Case Study: Landslides In Warungkiara, Bogor, Majalengka, Banjarnegara And Jember Utomo, Edi Prasetyo
Jurnal Geologi dan Sumberdaya Mineral Vol 23, No 1 (2013): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (762.87 KB)

Abstract

All of landslides recorded in Indonesia between 2003 – 2006, 90% of the events occurred on Java Island, Indonesia. Due to lack of long term statistical data, their characteristics are not well known. Based on the analysis of climate, geology, topography and landslide statistical data, the landslide characteristics on Java Island can be ascertained. It can be concluded that the frequency of occurrences of landslides are highest in the southern part of the West Java Province, followed by the Central Java Province and the East Java Province.Landslides on Java island can be classified based on their triggering factors, which comprise: rainfall, morphology, earthquakes, lithology, and the occurrence of active faults. As far as types of landslides are concerned, rockslides and toppling are rather rare, while most landslides are of the sliding (translation, rotation, block failure), creeping and debris flow types. The materials involved in landslides comprise weathered volcanic breccia, sedimentary material mixed with clay, mudstone, sandstone, limestone, marl and pyroclastic (deposits of volcanic ash and tuffaceous sand) and loam.Landslide events significantly occur in the rainy season, especially from December to April. Dead and missing victims by landslides increase when annual rainfall is in excess of 2100 mm. In this paper, with reference to the above mentioned factors and conditions, type of landslide prone areas and countermeasures will be discussed.Keywords: Landslide hazard, Java Island, classification, statistical data analysis.
Changes in the Configuration of the Fresh Water Lens due to ASRRG, Western Part of the Tiny Pari Island, Seribu Islands, Jakarta, Indonesia Utomo, Edi Prasetyo; Purwoaminta, Ananta; Sudrajat, Yayat
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 1 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Pari Island (Pulau Pari) is a small coral island in the Seribu Islands group off the north coast of the Jakarta Capital Special Region. Government has planned to develop this island into a tourist attraction because of its beautiful environment. However, the government development plans have not included facilities to meet the demand for groundwater, which represents the principal resource to meet the demand for freshwater. Pari Island has limited resources of groundwater due to the small size of the area where recharge of groundwater from rainfall can take place. A problem will arise that with the increase of visitors to the island the demand for freshwater will increase, while  groundwater resources of the island are very limited and dominated by brackish and saline groundwater. The objective of this research was to explore the possibility to increase the resources of fresh groundwater of Pari Island to support the increasing demand of fresh water. The method employed in the research is the application of ASRRG technology by the injection of the largest possible volume of rainwater and monitor changes of electrical conductivity and geoelectrical resistivity. Installation of an ASRRG network proved effective in lowering the salinity of groundwater in small islands. By increasing pore volume from 30% to 60% salinity decreases by 77%, which is reflected by the effect that the fresh groundwater lens which before comprised brackish water became fresh water with a thickness of 2.5 meter. The gain in pore volume equaled the decrease in salinity.Key words: Artificial recharge, Island hydrology, Salt-water/fresh-water relations, Indonesia
HYDROGEOLOGICAL STUDY TO SUPPORT SIGANDUL BRIDGE CONSTRUCTION AT PARAKAN, TEMANGGUNG, CENTRAL JAVA Utomo, Edi prasetyo; Purwoarminta, Ananta
Teknologi Indonesia Vol 38, No 2 (2015)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.054 KB) | DOI: 10.14203/jti.v38i2.167

Abstract

The plan of making bridge on the Sigandul river in Parakan, Temanggung regency is to improve the quality access roads in the Province of Central Java. The first step was to make the construction of the bridge pillars as the foundation of the bridge. For that purpose it was done drilling with planning a depth of 18 m, but at a depth of 12 m there was out of groundwater in a large discharge. This large groundwater discharge has disturbed the bridge construction process. The aim of this research is to analyze the causes of groundwater discharge and to provide a recommendation on counter measure of disturbance in the process of bridges construction based upon the hydrogeological condition. The methods used in this research were conducting a geological observation on ground surface and geoelectrical measurement with a dipole-dipole electrode arrangement. The results showed that the subsurface of research area is the site of groundwater accumulation and steep slope of its surrounding makes the groundwater came out with high pressure. Discharge rate of groundwater outflow in the area was 91.42 liters per second. Based on these conditions, it is recommended that the process of making a bridge construction should be done by first reducing the groundwater pressure or otherwise moving the foot of bridge the east side.
KUALITAS BATUGAMPING BERDASARKAN ANALISIS KLASIFIKASI GEOMEKANIK DI GOA SEROPAN, GUNUNG KIDUL, YOGYAKARTA Nugroho, Bani; Pranantya, Pulung Arya; Utomo, Edi Prasetyo
Bulletin of Scientific Contribution Vol 14, No 1 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1136.284 KB) | DOI: 10.24198/bsc.v14i1.9792

Abstract

Seropan cave is one of the caves in Semanu sub District, located in the karst region, Gunung Kidul, Yogyakarta. Based on reserach of Karlsruhe Institut of Teknology (KIT) German, is known underground river in the cave is very potential to be developed. Underground dams and micro hydro installations built to pump water upwards the river. These are used as raw water for daily needs and irrigation in the surface.  For this purpose it is necessary to study the stability of the rock mass in the cave Seropan. The stability of a tunnel or cave is heavily influenced by geological and non-geological factors. The most dominant geological factors in general are geological structures, can be muscular or fault, the type of rock and rock mass quality.The rocks at the cave Seropan in general are limestones. Based on rock mass classification of Rock Mass Rating (Bieniawski, 1989) otherwise known as the geomechanics classification, these rocks are included in class III and class IV. These rocks include moderate to bad quality. Until now the cave conditions remained relatively stable and secure. This is due to the naturally formed cave. The process of distribution of stresses around the cave coincided with the formation of caves and takes place in a relatively long time. However, in some parts of the cave should be because the effect of fractures can lead to collapse of the roof of the cave.
Co-Authors Ananta Purwoaminta, Ananta Ananta Purwoarminta, Ananta Bani Nugroho, Bani Pulung Arya Pranantya, Pulung Arya Yayat Sudrajat