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MITIGASI BENCANA BERBASIS MASYARAKAT PADA DAERAH RAWAN LONGSOR DI DESA KALITLAGA KECAMATAN PAGETAN KABUPATEN BANJARNEGARA JAWA TENGAH Parlindungan R., Ranto; Fathani, Teuku Faisal; Karnawati, Dwikorita
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

This research was carried out due to the occurrence of mass movement in Kalitlaga Village Pagentan Sub-District Banjarnegara District, which was one of most dangerous area to mass movement in Province Central Java. Such movement resulted in damaged houses and road. This research was conducted to recognize and identify the direction and type of mass movement, to identify the triggering parameters and the cause of mass movement in order to provide an appropriate disaster mitigation recommendation and prevention method, as well as to introduce low cost early warning system based on community which enabled the community to prepare and operate the system in lessening the disaster risks. Secondary and primary data used in this research were derived from field investigation and study. The method of the study is analyzing the results of field study. To obtain the percentage of people understanding on disaster mitigation, landslide, and early warning system, interviews were conducted and the interviews outputs were processed using the SPSS software. Result shows that the landslide is predominantly northeastern ward and slump type of movement. To the number of leaky water pipe and infiltrations into the ground induce the mass movement. This movement is due to geological factors such as geomorphology factor and existence of clay stone as well as high rainfall factor. The community low understanding on disaster mitigation represents the reason to install simple and cheap early warning system community based disaster mitigation. Such mitigation is easier to apply than technology based mitigation. It is also more suitable prior to a disaster. Community participation and also support from government are the key efficacy of disaster mitigation.
INFLUENCE OF GEOLOGICAL CONDITION TOWARDS SLOPE STABILITY ON LANDSLIDE: CASE STUDY IN TENGKLIK VILLAGE, TAWANGMANGU DISTRICT, KARANGANYAR REGENCY, CENTRAL JAVA PROVINCE, INDONESIA Najib, Najib; Karnawati, Dwikorita; Sudarno, Ignatius
Journal of Applied Geology Vol 2, No 3 (2010)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.7265

Abstract

A rain-induced landslide has occured in Guyon Village, Tengklik Tawangmangu District Karanganyar Regency, Central Java Province, Indonesia on February 2009. The movement was initiated by crack occurrence, 30 cm in depth and 2 meter in length. Such crack continuously developed in depth, extention and numbers, until then it resulted in land subsidence up to 260 cm in depth. Accordingly, ten houses were damaged and ten of families must be evacuated. This subsidence is very potential to further grow and create more consequences for human life and houses / land damage. Therefore, this research is carried out to understand the influence of geological factors and rainfall to the landslide phenomena. This research conducted engineering geology investigation such as mapping, drilling, insitu test, XRD test, soil mechanic test and slope stability analysis by limit equilibrium method i.e. Seep/W and Slope/W. By those research activities, the cause and mechanism of landslide can be understood. Rainfall characteristics which triggered such landslide can also be identified. Based on those investigations, it is found that the landslide occurred in slow rate sliding (creep) due to the control of slope stratigraphy conditions and gentle slope inclination, which is induced by rainfall. Stratigraphy condition that plays important role in landslide mechanism are the permeable layers consisted of sandy silt (shear strength 12 kPa) and silty sandstone (shear strength 18 kPa) overlaid above impermeable andesite breccia (shear strength 104 kPa). Undulating slope may induce landslide in creep rotational type. Based on slope stability simulation, it is known that rainfall triggered landslide is rainfall 20 mm/ day average precipitation in 55 days and rainfall 20 mm/ day average precipitation in 49 days followed by one day with 178 mm/ day average precipitation. Keywords: Landslides, slope stability
EVALUATION OF ROCKFALL OCCURRENCE IN PADANG–BUKITTINGGI ROAD,WEST SUMATRA, INDONESIA Wilopo, Wahyu; Karnawati, Dwikorita; Hussein, Salahuddin; Sudarno, Ignatius
Journal of Applied Geology Vol 2, No 3 (2010)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.7263

Abstract

A big earthquake occurred on September 20, 2009 in Padang, West Sumatra, Indonesia. This earthquake caused damage and loss of both property and lives. The earthquake also triggered the emergence of rock falls in several areas in Padang, especially in the road of Padang to Bukitinggi. After the earthquake in September, several big rockfalls occurred more than three times that cost lives. Based on field investigations, the incidence of rock falls was caused by field conditions which was prone to rockfall, such as steep slope and exposure of rocks to intensive structures that then triggered by earthquake and rainfall. Therefore, fast action is needed to be taken in order to minimize the impact of the rockfall disaster. Keywords: Rockfall, slope, rock structure, earthquake, rainfall
Promoting a Model of Research-Based Education in Disaster Mitigation Karnawati, Dwikorita; Wilopo, Wahyu; Inderawan, Gde Budi; Sudarno, Ignatius; Barianto, Didit Hadi
Journal of Applied Geology Vol 2, No 3 (2010)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.7258

Abstract

This paper highlights the importance to provide appropriate education model with multidisciplinary approach for supporting the capacity development in disaster mitigation. This education model is implemented as a student community service program, in order to accommodate the needs for improving the students’ knowledge and skill, as well as for stimulating the development of ethical values with respect to humanity and sustainable development concerns. This education model has been conducting as a part of the formal curricula at Gadjah Mada University, and it is accordingly introduced and reviewed in this paper with the specific emphasize to discuss its objective, mechanism, benefits, and social impacts, as well as the respective challenges. Finally, this research-based education model is proposed as one model for the disaster mitigation education, which can be applied not only for Indonesian but may also for ASEAN education model. Keywords: Education model, research-based, disaster mitigation
Engineering geology evaluation for predicting the collapse susceptibility of Sidoarjo hot mud earth levees: A hazard assessment Eka Putra, Doni Prakasa; Juwarso, Juwarso; Karnawati, Dwikorita
Journal of Applied Geology Vol 2, No 2
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.7252

Abstract

Since May 29, 2006, a sea of hot mud has been gushing from the ground in Sidoarjo, East Java, 35 kilometres south of Indonesia’s second largest city, Surabaya. Due to this disaster, approximately thousand of peoples have been forced from their homes because 600 ha of land and villages were submerged, farmland was ruined, businesses and schools closed as the mud inundated the surrounding area. The authorities response was to build containment ‘basins’ or ‘ponds’ by enclosing areas of land within earth dams, or levees. During the heavy rain on the rainy season, the earth dams and ringdykes have overflown and broken regularly, causing the flooding of more land and damaging infrastructures. However, not only in the rainy season, the levees had also collapses during the dry season. Therefore, an engineering geology study was conducted in order to evaluate the geological factors which causes this phenomena. The parameters used for the evaluation are the heterogeniety of lithology under the dams, geological discontinuity which indicated by the occuring of surface cracks and bubbles, and subsidence phenomena which indicated by the vertical displacement. Overlying method was used to build homogeniety zone of engineering geology based on those parameters, and the resulted map was once again overlay with the location of dams collapses. Result of this evaluation shows that the earth dams collapses were highly correlated with the existing geological discontinuities and subsidences, respectively. Based on this study, the susceptible location of earth dams collapses can be predicted and allow engineers to prepare and plan better engineering solution for the high probable collapses points in order to protect land and infrastructures from the damaging hot mud overflown. Keywords: Hot mud disaster, geological factors, homogeniety zone, earth levee failure points, Sidoarjo-Indonesia
PALEOSTRESS ANALYSIS TO INTERPRET THE LANDSLIDE MECHANISM: A CASE STUDY IN PARANGTRITIS, YOGYAKARTA Husein, Salahuddin; Sudarno, Ignatius; Pramumijoyo, Subagyo; Karnawati, Dwikorita
Journal of Applied Geology Vol 2, No 2
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.7251

Abstract

Paleostress analysis on the landslide boundary faults is able to explain the sliding mechanism. This method is particularly useful to study a paleolandslide. About 30 striated fault planes from the Parangtritis paleo-landslide, located in the Yogyakarta coastline, were analyzed to define their principle stress axes. The eastern boundary fault, named as the Girijati Fault, was the main fault responsible for the mass movement and leaving a considerable steep cliff. It moved normal in a left lateral sense with ENE – WSW extension and dragged the rockmass southward, creating a NNW – SSW extension along the Parangtritis Fault and turn it into the western boundary fault. The rockmass slided along the stratigraphic contact between the underlying Nglanggran Formation and the overlying Wonosari Formation, created a semi-circular crown cliff as the northern boundary and produced some isolated topographic highs of the thrust block near the toe. Keywords: Paleostress, landslide boundary, fault, paleolandslide
KELAYAKAN PEMANFAATAN LAHAN BEKAS TAMBANG BATUBARA UNTUK RELOKASI PERMUKIMAN PENDUDUK: STUDI KASUS AREAL TAMBANG PT. KITADIN KABUPATEN KUTAI KARTANEGARA PROVINSI KALIMANTAN TIMUR Wuryandari, Retno; Hendrayana, Heru; Karnawati, Dwikorita
Jurnal Manusia dan Lingkungan (Journal of People and Environment) Vol 12, No 1 (2005)
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

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Abstract

Penelitian ini bertujuan untuk mengevaluasi kelayakan tanah dan air di lahan penambangan batubara untuk area pemukiman. Penelitian di lakukan di daerah pertambangan batubara PT. Kitadin di kabupaten Kutai Kertanegara, provinsi Kalimantan Timur. Data untuk penelitian ini diperoleh dari survei lapangan dan sumber sekunder. Parameter yang dianalisis meliputi Soil Index Test, Grain Size Distribution, Density and Permeability. Parameter sample air meliputi pH, turbiditas, Total Dissolved Solid (TDS), Mangaan (Mn) dan Besi (Fe). Data tersebut dibandingkan dengan kriteria penggunaan lahan untuk mengevaluasi kadar kelayakan/kesesuaian lahan. Hasil menunjukkan bahwa daerah penelitian tertutup lempung dengan plastisitas kurang dari 50%. Akumulasi air dalam lubang daerah penambangan batubara tidak masam dan memadai untuk konsumsi publik pada masa yang akan datang. Secara umum, daerah penelitian di pertambangan memadai untuk daerah permukiman.
SUMMARY OF RESEARCH WORK ON THE EVALUATION ON LONG TERM STABILITY OF ARTIFICIAL SLOPE PROTECTION Soty, Ros; Karnawati, Dwikorita; Aoki, Kenji
Journal of Applied Geology Vol 1, No 2
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1703.67 KB) | DOI: 10.22146/jag.7226

Abstract

Application of GPR, RedExplorer1.4 and GeoStudio2004 have been used to evaluate the overall stability condition of a steep slope along Kalibawang irrigation channel km 8.5, Kulon Progo Regency, Yogyakarta Special Province, Indonesia, that this slope slid down in 1990 and was restabilized by cut to be gentler and covered by shotcrete. Topographic map and engineering geological map in scale 1:2000 have been established prior to the detail investigation. Three drilling logs with in-situ test, SPT and CPT, and samplings have been made and sent to soil mechanic laboratory for index properties tests, and a slope profile along the main axe will be also created for stability analysis through GeoStudio2004. Moreover, GPR has been used to run on a full slope surface to detect the distribution of fractures and/or cavities behind the shotcrete and the results have been interpreted by the aid of RedExplorer1.4.Three profiles showing the rate and depth of fractures and/or cavities are established whereas the slope stability analysis through GeoStudio2004 is the next target of the research. The author is expecting the result from the integration of GPR interpretation and GeoStudio2004 to figure out the overall stability with respect to its existing conditions and its own geometry. Keywords: GPR, GeoStudio2004, overall stability, fracture and/or cavities.
Copper Mobility Assessment Using Speciation Schemes: Case Study–Mantrijeron District, Yogyakarta, Indonesia Xaixongdeth, Phetnakhone; Hendrayana, Heru; Eka Putra, Doni Prakasa; Karnawati, Dwikorita; Sato, Tsutomu
Journal of Applied Geology Vol 4, No 2
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.7198

Abstract

factors such physical and chemical properties, especially mineralogical composition of such environment. This study focused on the mineralogical of two soils types (fine sandy loam and loamy fine sand) to retain/mobile Cu. Two non contaminated soils from Yogyakarta urban area, Indonesia, were artificially contaminated with Cu solution. Subsequently, soils artificially contaminated were extracted from various geochemical phases of soil by sequential extraction procedure. The results show that both of soils types can retain Cu well with maximum is 5.8 mg/g of loamy fine sand and 3.9mg/g of fine sandy loam. Additionally, the iron amorphous phase content in clay fraction is influence Cu retains in these soils. This is advantage in environment of Yogyakarta urban area, Indonesia, where this area underlain by loamy sand soil. Keywords: Copper, mobility, iron, sequential extraction.
Bio-geochemical simulation for solute transport in Piyungan landfill, Yogyakarta Special Province, Indonesia Phonhalath, Keophousone; Karnawati, Dwikorita; Hendrayana, Heru; Prakasa Eka Putra, Doni; Jinno, Kenji
Journal of Applied Geology Vol 3, No 1
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.7159

Abstract

Piyungan Landfill is the largest in Bantul Regency. According to water quality sampling taken from a leachate pond, there are significant contaminant issues resulting from landfill leachate. The objectives of this research were achieved by applying a two-dimensional bacteria mediated reduction numerical model was applied. Method of characteristic was applied to solve the advection part of the solute transport equation. Three bacteria (X1, X2, and X3) groups were defined in the redox model. In the conceptual model, bacterial X1 utilizes oxygen under aerobic conditions and nitrate, NO-3 under aerobic conditions as electron acceptors. Consequently, under aerobic conditions bacteria X2, and X3 utilize MnO2, and Fe(OH)3 respectively as electron acceptors. In the redox model organic carbon which was defined as CH2O was considered as the electron donor for all bacteria mediated reduction reactions. The results of research are to improve the understanding of biogeochemical processes in aquifer.