Articles

Found 16 Documents
Search

Geospatial Assessment of Coseismic Landslides in Baturagung Area Saputra, Aditya; Sartohadi, Junun; Hadmoko, Danang Sri; Gomez, Christopher
Forum Geografi Vol 29, No 2 (2015): December 2015
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v29i2.693

Abstract

Java, the most densely populated island in Indonesia, is located on top of the most seismically active areas in Southeast Asia: the Sunda Megathrust. This area is frequently hit by strong earthquake. More than 3,300 M>5earthquakesoccurred between 1973-2014. The wide range of mountainous areas and high intensity of rainfall, make several part of the island one of the most exposed regions for coseismic landslides such as Baturagung area, the Southeast mountainous area of Yogyakarta Province. An integrated method between RS and GIS was used to conduct the vulnerability assessment due to the lack of the site specific slope instability analysis and coseismic landslides data. The seismic zonation of Baturagung area was obtained based on the analysis of Kanai attenuation. The geologic information was extracted using remote sensing interpretation based on the 1:100,000 geologic map of Yogyakarta and geomorphologic map of Baturagung area as well. The coseismic landslide hazard assessment has been estimated using scoring analysis in the GIS platform proposed by Mora and Vahrson (1993) with several modification. The accomplished coseismic landslide hazard map shows medium hazard coverage in the eastern areas, in the upper slope of Baturagung area, which consists of Semilir Formation. The result provides a distinct description of coseismic landslides hazard distribution in Batuaragung area. However, it should only be the preliminary assessment of the site specific investigation especially on valuable area or asset. 
The Routledge Handbook of Hazards and Disaster Risk Reduction Hadmoko, Danang Sri
Jurnal Teknosains Vol 2, No 2 (2013): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (585.189 KB) | DOI: 10.22146/teknosains.6006

Abstract

Buku ini menjelaskan secara detail tentang ancaman bencana yang ada, berupa ancaman bencana geofisik, ancaman bencana hidro-meterologis, ancaman bencana biologis/ekologis, dan ancaman bencana astronomis
Geospatial Assessment of Coseismic Landslides in Baturagung Area Saputra, Aditya; Sartohadi, Junun; Hadmoko, Danang Sri; Gomez, Christopher
Forum Geografi Vol 29, No 2 (2015): Forum Geografi
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Java, the most densely populated island in Indonesia, is located on top of the most seismically active areas in Southeast Asia: the Sunda Megathrust. This area is frequently hit by strong earthquake. More than 3,300 M>5earthquakesoccurred between 1973-2014. The wide range of mountainous areas and high intensity of rainfall, make several part of the island one of the most exposed regions for coseismic landslides such as Baturagung area, the Southeast mountainous area of Yogyakarta Province. An integrated method between RS and GIS was used to conduct the vulnerability assessment due to the lack of the site specific slope instability analysis and coseismic landslides data. The seismic zonation of Baturagung area was obtained based on the analysis of Kanai attenuation. The geologic information was extracted using remote sensing interpretation based on the 1:100,000 geologic map of Yogyakarta and geomorphologic map of Baturagung area as well. The coseismic landslide hazard assessment has been estimated using scoring analysis in the GIS platform proposed by Mora and Vahrson (1993) with several modification. The accomplished coseismic landslide hazard map shows medium hazard coverage in the eastern areas, in the upper slope of Baturagung area, which consists of Semilir Formation. The result provides a distinct description of coseismic landslides hazard distribution in Batuaragung area. However, it should only be the preliminary assessment of the site specific investigation especially on valuable area or asset. 
Lahars in Java: Initiations, Dynamics, Hazard Assessment And Deposition Processes Lavigne, Franck; Thouret, Jean-Claude; Hadmoko, Danang Sri; Sukatja, Bambang
Forum Geografi Vol 21, No 1 (2007): July 2007
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Lahar has been applied as a general term for rapidly flowing, high-concentration, poorly sorted sediment-laden mixtures of rock debris and water (other than normal streamflow) from a volcano. Lahars are one of the most destructive phenomena associated with composite volcanoes, which are dominant in Java Island. Resulting deposits of lahar are poorly sorted, massive, made up of clasts (chiefly of volcanic composition), that generally include a mud-poor matrix. The aim of this research is threefold: to discuss the initiation of lahars occurrences, their dynamics, to assess the hazard and to analyse the deposition. Lahars are either a direct result of eruptive activity or not temporally related to eruptions. Syn-eruptive lahars may result from the transformation on pyroclastic flows or debris avalanches which transform to aqueous flows (e.g. at Papandayan in November 2002); They may be also generated through lake outburst or breaching (e.g. at Kelut in 1909 or 1966), and through removal of pyroclastic debris by subsequent heavy rainstorms. Post-eruptive lahar occurs during several years after an eruption. At Merapi, lahars are commonly rain-triggered by rainfalls having an average intensity of about 40 mm in 2 hours. Most occur during the rainy season from November to April. Non-eruptive lahars are flows generated without eruptive activity, particularly in the case of a debris avalanche or a lake outburst (e.g., Kelut). A lahar may include one or more discrete flow processes and encompass a variety of rheological flow types and flow transformations. As such, lahars encompass a continuum between debris flows and hyperconcentrated flows, as observed at Merapi, Kelut and Semeru volcanoes. Debris flows, with water contents ranging from 10 to no more than about 25% weight, are non-newtonian fluids that move as fairly coherent masses in what is thought to be predominantly laminar fashion. However, the relative importance of laminar versus turbulent regime is still debatable. Hyperconcentrated streamflows contain 25- to about 40%-weight-water; these flows possess some yield stress, but they are characteristically turbulent. Hazard-zone maps for lahar were produced for most of the the Javanese volcanoes, but these maps are on too small-scale to meet modern zoning requirements. More recently, a few large-scale maps (1/10,000 and 1/2,000-scale) and risk assessments have been completed for a few critical river systems at Merapi.
TINGKAT KERENTANAN DAN INDEKS KESIAPSIAGAAN MASYARAKAT TERHADAP BENCANA TANAH LONGSOR DI KECAMATAN BANTARKAWUNG KABUPATEN BREBES Farhi, Zayinul; Sudibyakto, Sudibyakto; Hadmoko, Danang Sri
Majalah Geografi Indonesia Vol 26, No 1 (2012): Maret 2012
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1053.497 KB) | DOI: 10.22146/mgi.13406

Abstract

ABSTRAK Bantarkawung adalah salah satu kecamatan di Kabupaten Brebes yang sering terjadi bencana tanahlongsor. Oleh karena itu diperlukan pemetaan tingkat kerawanan dan kerentanan serta penilaian indeks kesiapsiagaan masyarakat. Tujuan dari penelitian ini adalah menentukan tingkat kerawanan, menentukan tingkat kerentanan, menilai indeks kesiapsiagaan masyarakat dan menganalisis hubungan tingkat kerawanan dengan nilai indeks kesiapsiagaan masyarakat terhadap bencana tanah longsor.  ABSTRACT Bantarkawung is one of the sub distict in Brebes regency which has many landslide occurences. Therefore, it is necessary to map susceptibility and vulnerability and to value community preparedness index. The aims of this research were to determine landslide susceptibility, determine vulnerability of element at risk (people and settlement) based on susceptibility zone toward landslide disaster, valuate community preparedness index, and analize relationship between susceptibility and community preparedness index toward landslide disaster. 
Dampak Erupsi Merapi 2010 terhadap Pemanfaatan Lahan dan Aktivitas Perekonomian Masyarakat di Daerah Aliran Sungai Gendol Ardianingrum, Alvyntha Glaudia; Hadmoko, Danang Sri; Muta’ali, Lutfhi
Majalah Geografi Indonesia Vol 28, No 2 (2014): September 2014
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4205.212 KB) | DOI: 10.22146/mgi.13071

Abstract

ABSTRAK Perubahan pemanfaatan lahan pasca erupsi menyebabkan perubahan aktivitas perekonomian masyarakat, terutama untuk pemanfaatan lahan pertanian. Tujuan penelitian ini adalah :  (1). Mengidentifikasi dampak erupsi Merapi 2010 terhadap perubahan  pemanfaatan penggunaan lahan; (2). Menganalisis dampak perubahan pemanfaatan penggunaan lahan  terhadap aktivitas perekonomian (matapencaharian) masyarakat setempat; (3). Mengevaluasi dan merekomendasi upaya pemulihan ekonomi masyarakat pasca erupsi. Perubahan penggunaan lahan diperoleh dari overlay Peta Penggunaan Lahan Sebelum Erupsi dengan Peta Penggunaan Lahan Sesudah Erupsi. Analisa daya pulih rumahtangga diperoleh dari wawancara. Penyamplingan dilakukan di Dusun dengan purposive sampling, mempertimbangkan daerah tersebut termasuk di daerah terdampak total atau sebagian dan jumlah korban KK terbanyak dan sedikit. Pengambilan sampel di KRB 3 sebanyak 50 responden, KRB 2 sebanyak 30 responden, dan KRB 1 sebanyak 15 responden. Pengambilan responden di setiap Dusun menggunakan metode simple random sampling karena memperhatikan keragaman populasi yang relatif  homogen. Variabel yang dianalisa meliputi asset, akses, dan aktivitas masyarakat. Jenis penggunaan lahan mengalami penambahan pascaerupsi yaitu penambahan shelter dengan luas 140,66 Ha. Penggunaan lahan yang berkurang luasanya adalah semak belukar 312,994 Ha, kebun 292,702 Ha, rumput 30,514, dan tegalan 2155,698 Ha. Sedangkan penggunaan lahan yang bertambah luasannya adalah pemukiman 2222,664 Ha, sawah irigasi 428,584 Ha, dan shelter 140,66 Ha. Tingkat daya pulih rendah lebih besar yaitu 65%, dan daya pulih tinggi sebesar 35%. Dari ketiga variabel asset, akses, dan aktivitas, variabel asetlah yang memiliki kontribusi berpengaruh lebih besar. ABSTRACT Gendol Watershed be a research location because this watershed is the most severely affected. Cangkringan was chosen as the focus area on this research because this area as one of the District in Sleman that located on the slopes of Mount Merapi and the resources was affected. The changing of land use after the eruption can changes the economic activity of the communities, particularly for agricultural. The aims of this research are: (1). Identify the impact of Merapi eruption in 2010 for land use changes, (2). Analyzing the impact of land use changes for economic activities (livelihood) on local community; (3). Evaluation and recommendation public economic recovery efforts after the eruption. The land use changes acquired from the result overlay of Land Use before eruption and Land Use after eruption. Analysis of household resilience derived from the interviews. Sampling area on Kepuhharjo Village, Wukirsari , Glagahharjo and Argomulyo because this area was the greatest affected area. Sampling this area was done with purposive sampling, considering this area included in the severely affected or partial. Respondents of KRB 3 are 50 respondents, KRB 2 are 30 respondents, and KRB 1 are 15 respondents. Respondents in each Village was choosen by simple random sampling method because the observed variability is relatively homogeneous population. Variables analyzed include the assets, access, and community activities. Type of land use have increased post-eruption is shelters area 140,66 Ha. Land use was reduced by bush 312.994 ha , farm 292.702 ha, grass 30.514, and field 2155.698 Ha. Land use was improved by settlement 2222.664 ha, 428.584 ha of irrigated rice fields, and shelter 140.66 Ha. The changing of land use on post-eruption has a positive and negative impact on societies. The positive side for some communities provide new livelihoods, and  negative  impact the public land could not be processed, many homes are destroyed and majority communities lost their occupation. Resilience of communities are in low classified 65 %. From the three variables, asset variables that have the largest contribution affect on resilience.
Tinjauan Kerentanan, Risiko dan Zonasi Rawan Bahaya Rockfall di Kulonprogo, Yogyakarta Hizbaron, Dyah R.; Hadmoko, Danang Sri; Wibawa, Samodra; Dalimunthe, Syarifah Aini; Sartohadi, Junun
Forum Geografi Vol 24, No 2 (2010): December 2010
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v24i2.5021

Abstract

This research aims at identification of spatial plan zonation in rock fall prone areas. Research method applies hazard, vulnerability and risk analysis as an input for spatial modeling using Multi Criteria Evaluation (MCE). Research reveals that in Girimulyo is susceptible towards rock fall. In the last decades, there were 16 occurrences of rock fall that impacted to physical damages. Fortunately, such disaster did not cause any harm to human life. Therefore, research argue that physical vulnerability analysis can be analyzed, while social vulnerability cannot be analyzed further, since it had less data support. According to the research, there are more than 48 housing units located in hazard zone. Hence, local government should initiate structural mitigation to avoid further loss. Research also reveals that areas with high susceptibility will not directly consider as high risk zone, unless it has high vulnerability index. Example: areas along escarpment, where it has high susceptibility, but it has no element at risk in the area. Thereby, research tries to present zonation for prone hazard areas, using risk index. The result is quite representative, since possible areas to be developed is anywhere alongside road network. Indication of the area is produced from the multi criteria analysis. Multi criteria analysis is an essential method to combine spatial data and its attribute. Using such method requires more data input and expertise in justifying indicator to be selected.
Spatio-Temporal Distribution of Landslides in Java and the Triggering Factors Hadmoko, Danang Sri; Lavigne, Franck; Sartohadi, Junun; Gomez, Christopher; Daryono, D
Forum Geografi Vol 31, No 1 (2017): July 2017
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v31i1.3790

Abstract

Java Island, the most populated island of Indonesia, is prone to landslide disasters. Their occurrence and impact have increased mainly as the result of natural factors, aggravated by human imprint. This paper is intended to analyse: (1) the spatio-temporal variation of landslides in Java during short term and long-term periods, and (2) their causative factors such as rainfall, topography, geology, earthquakes, and land-use. The evaluation spatially and temporally of historical landslides and consequences were based on the landslide database covering the period of 1981 – 2007 in the GIS environment. Database showed that landslides distributed unevenly between West Java (67 %), Central Java (29 %) and East Java (4 %). Slope failures were most abundant on the very intensively weathered zone of old volcanic materials on slope angles of 30O – 40O. Rainfall threshold analysis showed that shallow landslides and deep-seated landslides were triggered by rainfall events of 300 – 600 mm and > 600 mm respectively of antecedent rainfall during 30 consecutive days, and many cases showed that the landslides were not always initiated by intense rainfall during the landslide day. Human interference plays an important role in landslide occurrence through land conversion from natural forest to dryland agriculture which was the host of most of landslides in Java. These results and methods can be used as valuable information on the spatio-temporal characteristics of landslides in Java and their relationship with causative factors, thereby providing a sound basis for landslide investigation in more detail.
Analisis dan Estimasi Dampak Longsorlahan terhadap Jaringan Jalan di Kecamatan Samigaluh, Kabupaten Kulonprogo Nugroho, Eko Setya; Hadmoko, Danang Sri; Westen, Cees van; Kingma, Nanette
Forum Geografi Vol 26, No 2 (2012): December 2012
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v26i2.5068

Abstract

In this study, direct risk assessment was developed for various scenarios on the basis of hazard (e.g. spatial probability, temporal probability and magnitude class), vulnerability and estimating cost of road damage. Indirect risk assessment was derived from traffic interruption. The impact of landslide both direct and indirect impact were analyzed in the road segment 174. The research results show the highest direct impact of debris slide type of magnitude I located in the 20th mapping unit. The lowest direct impact of debris slide type of magnitude I can be founded in the 18th mapping unit. The direct impact of rock fall type of magnitude I which is located in the 6th mapping unit. Meanwhile, indirect impact which was caused by road blockage is Rp. 4,593,607.20 and Rp. 4,692,794.40 by using network analysis and community perception methods respectively. After class classification, road segment 174 is dominated by very low hazard, very low vulnerability and very low direct impact.
Optimalisasi Peran Kodim Dalam Penanggulangan Bencana Banjir Dan Implikasinya Terhadap Ketahanan Wilayah ( Studi di Kodim 0614 Kota Cirebon, Jawa Barat ) Dulkadir, Dulkadir; Armawi, Armaidy; Hadmoko, Danang Sri
Jurnal Ketahanan Nasional Vol 22, No 1 (2016)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jkn.10581

Abstract

ABSTRACTThe purpose of this study was to determined the role of optimizing the Kodim 0614 in flood disaster management and its implications for the resilience of the region in the City of Cirebon. The research was conducted with using qualitative research with primary data collection techniques through in-depth interviews, observation, documentation and secondary data from the literature.Kodim 0614 in carrying out flood disaster management experienced obstacles that were less than optimal. These constraints were institutional disaster management, policy implementation, command and control, human resources, infrastructure and budget. Kodim 0614 looked for strategies to overcome these constraints for the implementation of flood disaster management tasks could be implemented optimally. This study illustrated that by optimizing the role of Kodim 0614 which was held on a stage before, during and after the disaster to helped the local government Cirebon, the role of Kodim 0614 to be more optimal than before.Optimizing the role of Kodim 0614 on stage before, during and after the disaster was done by the method of territorial management in the form of TNI bakti activities, Social Communication and helped immediately upon the occurrence of floods and implications of the activities done by Kodim 0614 the good impact on all aspects of life in society. ABSTRAKTujuan penelitian ini untuk mengetahui optimalisasi peran Kodim 0614 dalam penanggulangan bencana banjir dan implikasinya terhadap ketahanan wilayah di Kota Cirebon. Penelitian dilakukan dengan metode penelitian kualitatif  dengan tehnik pengumpulan data primer melalui wawancara mendalam, observasi, studi dokumentasi dan data sekunder dari kepustakaan.Hasil penelitian menunjukkan bahwa Kodim 0614 dalam menjalankan tugas penanggulangan bencana banjir mengalami kendala-kendala sehingga kurang optimal. Kendala tersebut yaitu kelembagaan penanggulangan bencana, implementasi kebijakan, komando pengendalian, sumber  daya manusia, sarana prasarana dan anggaran. Kodim 0614 mencari strategi dalam mengatasi kendala-kendala tersebut agar dalam  pelaksanaan tugas penanggulangan bencana banjir dapat dilaksanakan dengan optimal. Penelitian ini menemukan bahwa dengan optimalisasi peran Kodim 0614 yang dilaksanakan pada tahap sebelum, saat dan pasca bencana dalam membantu pemerintah daerah Kota Cirebon, peran Kodim 0614 menjadi lebih optimal bila dibandingkan sebelumnya.Optimalisasi peran Kodim 0614 pada tahap sebelum, saat dan pasca bencana dilakukan dengan metode pembinaan teritorial berupa kegiatan bakti TNI, Komunikasi Sosial maupun perbantuan langsung pada saat terjadinya bencana banjir dan implikasi dari kegiatan yang dilaksaanakan oleh Kodim  0614 tersebut berdampak baik terhadap segala aspek kehidupan dalam masyarakat.