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Forum Geografi
Published by Universitas Muhammadiyah Surakarta
ISSN : 08520682     EISSN : 24603945     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
Forum Geografi, Indonesian Journal of Spatial and Regional Analysis (For. Geo) is an open access, peer-reviewed journal that will consider any original scientific article for expanding the field of geography. The journal publishes articles in both physical and human geography specialties of interest to spatial analysis and regional analysis in (but not limited) Indonesia by applying GIS and/or remote sensing techniques.
Arjuna Subject : -
Articles 1,205 Documents
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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

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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. 
Development and Evaluation of Web GIS Application for Groundwater Management of Karanganyar Regency Jumadi, Jumadi; Priyana, Yuli
Forum Geografi Vol 29, No 2 (2015): Forum Geografi
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

This research aims to develop and evaluate a geospatial application for groundwater resource management at Karanganyar Regency. The system development methodology from Whitten and Bentley (2007) was used in this research. To initiate the project, we discussed with the stakeholders from Karanganyar Regency which came from various related agencies followed by a focus group discussion (FGD) to analyse the system. Computational design and experiment were conducted to design the system prototype. Finally, we implement the system in the Regency. The result shows that the system is complex not only due to the managerial procedures but also the number of involved users (stakeholder) in the system. To address the emerged requirements from the FGD, we propose and develop a web-based GIS application with current open source technology and Google Map API which can be used for collaboration among stakeholders as well as for supporting the decision support purpose in the groundwater management. Currently, Air-tanah, the prototype of the application is available at http://geografi.ums.ac.id/air-tanah/. Both quantitative and qualitative evaluation of the system resulted good responses from the users.
Geospatial Analysis and Turbidity Measurement for Monitoring Suspended Solid of Hitotsuse Dam in Miyazaki Prefecture, Kyushu, Japan Santosa, Purnama Budi; Mitani, Yasuhiro
Forum Geografi Vol 29, No 2 (2015): Forum Geografi
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

The existence of suspended solids at Hitotsuse dam, Miyazaki Prefecture, Kyushu, Japan, has been the main concern of Kyushu Electric Power Company. These have been carried by rivers flowing into the dam. In a long term, it is worried that this phenomenon will potentially cause the environmental degradation, especially around the dam, where the Kyushu Electric Power Plant is located. Therefore, necessary measures are required to protect the dam from environmental degradation, which in return is to assure its long term power plant operational. Preliminary studies found that the suspended solid, which was generated upstreams and was carried out into the dam by rivers, causes the turbid water resident. Therefore, evaluation on the potential sources of the existence of the suspended solids needs to be carried out. In this research, analysis was conducted to understand the spatial distribution and the quantity of the suspended solid. For this purpose, by focusing attention on the upper river basin of reservoir, several factors which are possible to cause turbid water are extracted and analyzed quantitatively by using GIS. To understand the characteristic of the river turbidity, river flows and river turbidity are measured at several selected stations. Then mechanical factors causing turbid water are identified after analyzing relationship between efflux characteristics and possible factors of suspended solids. The results show that spatial information extraction could be done efficiently by applying spatial analysis method. Furthermore, by applying multiple regression analysis, it was found that landslide scars, artificial forests, drainage area, and terrain undulation are indicated as the dominant factors causing the turbidity.
Morphometry Characteristics of Riverbed Sediment Grains as Basic Indicator Management of River Valley Environment (Case Study of Bogowonto River, Central Java) Dibyosaputro, Suprapto
Forum Geografi Vol 29, No 2 (2015): Forum Geografi
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

This research aims to propose the usage of riverbed sediment grains roundness/flatness as basic indicator of river valley management. It is based on the evaluation of anomalous morphometry condition of sediment grains and valley condition along the river as one indicator of the stability of the riverbank of the river valley. This stability express the physical condition of the river valleys. In this paper, we provide methodological explanation as well as a case study in Bogowonto River. Analysis of the morphometry of sediment grain on riverbed from upstream to downstream as well as the relationship between the distance of the upstream and morphometry of sediment grains along Bogowonto River were conducted. Finally, we evaluated the anomalous condition as indicator of different environmental condition of the riverbank. We conducted three stages survey processes: preparation, fieldwork, and post-fieldwork. The preparation phase includes site selection, depiction of the main river channel of Bogowonto River, and the determination of the sample location. The distance between each sampling site was 5 km along Bogowonto River. The results show that there is anomalous morphometry of sediment grains found in the study area. The reason is that the channel of the segment of the river flowing over rocky riverbed of breccia along the 7.5 km, with hard and sharps edge grained of rock particles. This is accompanied by landslide the occurrence in the upper segment of the river. This is why the value of roundness and flatness indexes are changed significantly become lower value than the previous segment. This condition can be implemented to be used as indicator to basic management of landslide along a certain segment which indicated by the changing in roundness and flatness index values of the sediment grains. 
The Hierarchy of Earthquake and Tsunami: The Cases of Aceh, Nias, Bantul, Pangandaran, and Sunda Staits Hardjono, Imam
Forum Geografi Vol 20, No 2 (2006): December 2006
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Indonesia is vulnerable to earthquake and tsunami disaster because it is located in the fracture zone between the continental and oceanic lithospheres, running from the west of Sumatera, though the south of Java, NTB, Sulawesi to Papua. In the theoretical framework of Indonesian tectonic lithosphere, this zone is known as Sula-spuur. The frequent earthquake and tsunamis in Indonesia justify the theory that the earth will always seeks for dynamic self-balance through oceanic basin as well as continental basement expansions. Based on the tectonic lithosphere analysis, the anatomy of earthquake and tsunami disaster in Java falls into two different paths. The first is northwestward path in Western Java following the Semangko fault trend, from Pangandaran/Cilacap through Kadipaten, Subang to Jakarta. The other is the northeastward path in Central Java and East Java running from Bantul through Prambanan, Klaten to Rembang. The two hats correspond to the seventeen-kilometre-deep-underground fracture involving basement rocks resulted from the area shifting evolution during the limestone age prior to the existence of limestone in Indonesia. Based on the evidences found in Bantul- Klaten earthquake, the question necessary to raise is whether similar earthquake may happen in Jakarta.
Model of Conservation on Sagara Anakan Environment Sugandi, Dede
Forum Geografi Vol 27, No 2 (2013): December 2013
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Widespread decline in agricultural land and the impact on production decline caused extensive forest activities to meet the needs of the population. Activities that cause less environmental quality offset environmental balance changes. These changes due to deforestation, erosion, degraded land and natural resource degradation are exploited so that the function of ecological, economic and social life. Damaged ecosystems resulting in erosion, landslides in the watershed affect the sedimentation in Sagara Anakan sea. Silting, resulting in narrowing of fishing activities, tourism, sports, and services decreased crossings. Because of the problem and the purpose of this study proposed and analyzed a few questions: 1) How does the socio-economic impact of farmers in conserving the environment of Sagara Anakan ?, 2) How do people form of conservation and coastal of Sagara Anakan ?, 3) How model of integrated conservation in the watershed and coastal of Sagara Anakan ? and 4) What role do the people in the watershed and coastal on Sagara Anakan conservation ?. Study site covers an area of flow and Ci Ci Tanduy Beureum and Sagara Tillers waters. Activities of the population in the process of land affected when in Sagara tillers. The method used was a survey with a sample divided by the watershed upstream, downstream and coastal tengahm. Using statistical analysis techniques and geography, so that part of the watershed characteristics can be imaged. Shallowing Sagara Anakan, physically was affected by the physical condition of the easily eroded and accelerated by human activities. The activities of farmer on the watershed have done conservation unless doing reforestation, whereas the farmer on the swamp and coastal areas are not doing conservation. Different physical circumstances, the conservation of watersheds and coastal forms differ. Socio-economic condition of farmer affect the conservation. The farmer could not reforestation conservation form, as the socio-economic needs. While in the farmer swamp and coastal conservation is not done, because the physical state was not possible. To conserve of Sagara Anakan, then the shape of coastal conservation by planting trees, not catch fish, marine dredging, not taking out the trash, do not use drugs to win the fish and catch a certain size. While in conservation should be done with different shape and performed in an integrated manner that requires the participation of the population.
Analisis Profil Daerah Kabupaten Klaten Tahun 2002-2005 Priyono, Priyono; Susilo, Ihwan; Karyono, Karyono; Sigit, Agus Anggoro
Forum Geografi Vol 20, No 1 (2006): July 2006
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Klaten Regency is a regency that owning very strategic situation, that is lay between 3 (three ) metropolis (Jogjakarta, Surakarta, and Semarang). This Regency is having immeasurable properties, there are agriculture area, tourism, mining, and so on. This condition is obliging that this regency have to make an inventarisation of their properties to make a profile so thisregency can make a good decision to their region especially to their peoples. This research use secondary data analisys that collected from region statistics and by collecting data from many related institution and than it can gives some resource balance of this sub-province. Topographic condition of Klaten Regency predominated with flat and landuse which is rice field areal still majority, designate that this area is compatible used for agriculture. This condition is proved with big paddy supply which reach 300 ton per year while other agriculture product just only about tens of thousand ton. Agriculture sector is a potential sector to buils but the condition is worsed by the degradation of rice field areal with 26 hectare per year and also the increasing of the amount of resident every year that is proving the high requirement of land. Besides agriculture, this sub-province is also supported with mine and tourism sector. Mining sector are stone, clay, and sand are caused by the location of this area is in volcanic hill side. Tourism sector also contribute big Region Original Income to this Regency which progressively mount every year. By 3 (three) tourism object type, this sector can contribute Region Original Income equal to 773.674.000 rupiahs and supported with hotel facility, restaurant, and accessibility which mounting every year. However, amount of terminal which in this time there is not yet supported the demand.This Regency also experience of the increasing of economic sector, that is the financial that is the amount of Foreign Capital Proyect and Nation Capital Proyect, Region Original Income , and Brotto Regional Domestic Product that designating the increasing of people level live.
Analisis Spasial Ekologikal Sumberdaya Lahan di Provinsi Daerah Istimewa Yogyakarta Worosuprodjo, Suratman
Forum Geografi Vol 21, No 2 (2007): December 2007
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Land resources is an important geographical aspect related to landuse allocation for human living.  The aim of this research is to study the spatial ecological analysis for land resources in related to landuse type in the Province ofYogyakarta Special Region, the approach used in the research is landscape analysis based on geomorphological mapping, topographic map at scale 1:100000. Land resources potential in the study area can be classified based on landscape such as volcanic landscape, fluvial landscape, marine and eolion landscape, karst landscape (Gunung Sewu), structural - denudational landscape (Balur Agung). Landuse can be alocated based on the landscape condition, and limitation. Land limitation such as slope steepness, soils, natural hazard, water resources in each landscape can be used as detrminant factors in the landuse plan.
Adaptation Strategy of Seaweed Cultivation to Face the Climate Change (Case Study in Segoro Anakan Bay Ngadirojo, Pacitan) Amri, Syahrial Nur; Arifin, Taslim
Forum Geografi Vol 30, No 1 (2016): July 2016
Publisher : Universitas Muhammadiyah Surakarta

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The damage of coastal ecosystems are no longer dominated by human activity, but the condition of global climate change were also influenced. Climate change impact on the environment influencing the coastal management paradigm. This study emphasizes on how to develop a adaptation strategy of coastal zone management due to the impact of climate change through remote sensing approach, Geographic Information Systems (GIS), and adaptation strategies analysis. Location of research conducted in the Region of Segoro Anakan Bay, District Ngadirojo Pacitan. The results showed the impact of climate change is affecting the area and production of seaweed culture in the form of tectonic conditions aggravated by silting waters. To combat the effects of climate change, the adaptation scenario is implemented to intensification and extensification of land use, alternative livelihoods, minawisata as a combination of all three.
Metode Mitigasi Longsorlahan di Kecamatan Gumelar Kabupaten Banyumas Provinsi Jawa Tengah Suwarno, Suwarno; Sutomo, Sutomo
Forum Geografi Vol 21, No 1 (2007): July 2007
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

This research aims to find formulating to mitigation of dangser of landslide, by observe on the classes of landslise dangser, the risk of landslide and the landslide disaster. The method used in the research is survey with two kinds of variables, the dependent variable includes the classes of dangser and the classes risk for the landslide, and the independent variable is the effart of mitigation. The classes of dangser and risk for the landslide are obfained from the secondary data, white the efforts of mitigation for the landslide are determined in accordance with the classes of landslide danser and risk landslide by considery the supporting factors. The result of the research shows that the field studied is the area with high risk of landslide. The dominant factors for the risk are the type of litology, and the weatering. The classes of landslide risk ranges from the low to the high. Hence, the efforts of mitigation should be tayseted first to those areas with the high risk of landslide. The efforts of mitigation to put into practive should consider. The dominant factors in the area, its can be underfaken by desighing a priovity, based on its terms covering shout ferm, medium term and long term.

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