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Published by Universitas Muhammadiyah Surakarta

ISSN : 08520682 EISSN : 24603945 DOI : -

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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.

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Search results for , issue " Vol 21, No 1 (2007): July 2007" : 16 Documents clear

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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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.

The Influence of Cultivation System on Distribution Profile Of 137cs and Erosion / Deposition Rate Suhartini, Nita
Forum Geografi Vol 21, No 1 (2007): July 2007
Publisher : Universitas Muhammadiyah Surakarta

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137Cs radiogenic content in the soil can be used to estimate the rate of erosion and deposition in an area occurring since 1950âs, by comparing the content of the 137Cs in observed site with those in a stable reference site. This experiment aimed to investigate the influence of cultivation type on distribution profile of 137Cs and distribution of erosion and deposition rate in cultivated area. A study site was small cultivated area with slope steepness <10o and length 2 km located in Bojong â Ciawi. For this purpose, the top of a slope was chosen for reference site and three plot sites were selected namely Land Use I that using simple cultivation, Land Use II that using simple cultivation with ridge and furrow, and Land Use III using machine cultivation. The results showed that cultivation could make a movement of 137Cs to the deeper layer and ridges and furrows cultivation system could minimized an erosion process. The net erosion and deposition for land Use I, II and III were -25 t/ha/yr , 24 t/ha/yr and -58 t/ha/yr, respectively.

Perubahan Permukiman Perdesaan Pesisir Kabupaten Gunung Kidul Daerah Istimewa Yogyakarta Tahun 1996-2003 Ritohardoyo, Su
Forum Geografi Vol 21, No 1 (2007): July 2007
Publisher : Universitas Muhammadiyah Surakarta

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One of the impacts of coastal region development is settlement change. Because of that, this article presents a result of research about changing of settlement land area, house buildings, settlement facilities since 1996 up to 2003, and several factors which influence to the changing. This research was carried out in 20 karst villages borders on Indian Ocean so-called coastal villages in of Gunungkidul Regency as analysis units. Data analysis employs so-called secondary data analysis method, using Village Potentials Cencus (PODES) data were published in Statistics Central Bureau. Data analysis employs frequency, cross tabulations, and statistical analysis. Result of this research shows that as long as 1996 up to 2003 the settlement land area increases on 0.24 % per annum on an average, while the house building number on 6.14 % per annum. Spatially several coastal rural villages are near or as a tourism object or as a district office locations are higher developing than the others of coastal rural villages. It means that the development of tourism objects as long as 1996 up to 2003 has influenced the coastal rural settlement development. Generally, the development of coastal rural settlement is significantly also influenced by thirteen of physical and socio-economical factors (R=0.903; Sig.=0.05). In detail however, among the 13th of physical and socio-economical factors are only five factors significant influence to the development of coastal rural settlement. The 5th factors are the average of place elevation, well number, propotion of agriculteral land area, household densty, and population density. Based on that findings in order to develope of coastal rural settlement especially in karst region, besides the development of tourism objects, the five factors should be taken in consideration.

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

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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.

Aplikasi Penginderan Jauh dan Sig Untuk Penetapan Tingkat Kemampuan Penggunaan Lahan (KPL) (Studi Kasus di DAS Nawagaon Maskara, Saharanpur-India) Harjadi, Beny
Forum Geografi Vol 21, No 1 (2007): July 2007
Publisher : Universitas Muhammadiyah Surakarta

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The land that was increasingly crowded resulting from the inhabitantsâs speeding-up pressure, required the utilisation of the land to be as efficient and as effectively as possible. For this matter must be known by the LUC (Land Use Capability) class respectively the unit of the land management, so as to be known as early as possible the obstacle factor from the land and could be done by the utilisation of the land as optimally as possible. The implementation of the LUC determination must be carried out a stage for the sake of a stage by counting LUC respectively the main factor, so as to be received by LUC-Soil, LUC-Erosion, and LUC-Slope. The next one of the three of this LUC were just counted by the value of the maximum to appoint LUC Final. LUC-Slope by being based on the Wischmeier and Smith (1978), LUC-Erosion was counted by using the quantitative MMF erosion formula (Morgan, Morgan, and Finney), and LUC-Soil by gathering the physical data the field took the form of the texture data of the land, drainage, solum and the percentage of the rock in the surface. LUC-Erosion and LUC-Soil were received by 5 LUC classes (I, II, III, IV, IV, and VI), whereas LUC-Slope was received by 7 LUC classes all of them except the V. LUC I class until IV were recommended for the agricultural crop and LUC V until VIII for the forestry crop. From 11 of Sub Watershed LUC VIII was expanded 107.54 ha to Sub Watershed Sarbar Rao and narrowest to Sub Watershed Maskara Rao (0.12 ha). On the other hand for LUC II was expanded to Sub Watershed Nawagaon Rao (1136.8 ha) and narrowest (1.51 ha) to Sub Watershed Shakumbari Rao. The location of the research in Sub Watershed Nawagaon Rao Mascara the Saharanpur city, India, with the location goegrafis from 30 o 09â 00" N - 30o 21â 00" N and longitude 77 o 34â 00" E - 77 o 51â 00" E, widely the Watershed whole 205.94 km2 or 20594.49 ha. The analysis of the image satelit with IRS (Indian Remote Sensing) LISS IV in January 2005, the analysis of three dimensions with DEM SRTM, and the map of the topography of the sheet 53 F/11, 53 F/12, 53 F/15 and 53 F/16. The aim of the research of determining the LUC class by counting each one of LUC-Soil, LUC-Erosion, and LUC-Slope. The use of the land in the Nawagaon Maskara Rao Watershed in part: Wheat super (969,26), normal Wheat (2753.7 ha), the Orchard (2103.2 ha), the Forest was rather close (3930.5 ha), the Forest was open (3352.1 ha), Scrub (168.62 ha), Brush rocky (658.56 ha), and Open land (1814.8 ha). Was based on results of this research recomendation for LUC VIII was only for the protected forest that might not be touched or produced.

Earthquake Disaster of Yogyakarta and Central Java, and Disaster Reduction, Indonesia Sutikno, Sutikno
Forum Geografi Vol 21, No 1 (2007): July 2007
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This paper discussed on earthquake disaster and its reduction of Yogyakarta and Central Java, Indonesia. The study area is located at relatively a short distance from subduction zone of India-Australian and Eurasian plates. Geologically this area is characterized by fault and graben structure, and geomorphologically is composed of block mountain, karsts topography and fluvio-volcanic plain. Aim of this paper is to evaluate the spatial distribution of the damage area, the environmental impacts, and to discuss the risk reduction of earthquake disaster scientifically and practically. In this paper to determine the hazard susceptibility zone and their environmental impact used geologic, geomorphologic, land use map, remote sensing image interpretation, and field observation. Discussion on the earthquake disaster risk reduction based on the hazard susceptibility and the characteristic of the human settlement and facilities. The result of this study shows that: i).the high damage area associate with distribution of the fault structures and the lithology; ii). mass-movement, lowering of groundwater, rising new springs, liquefaction, cracking of rocks and land surface; iii). structural non structural efforts are used for earthquake disaster reduction.

Analisis Karakteristik Permukiman Desa-Desa Pesisir di Kabupaten Kulonprogo Marwasta, Djaka; Priyono, Kuswaji Dwi
Forum Geografi Vol 21, No 1 (2007): July 2007
Publisher : Universitas Muhammadiyah Surakarta

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Settlement is the most important area in the activity of disaster mitigation. The Biggest detriment caused by disaster is generally placed at the settlement or residential area. Thereby, the identification of the settlement characteristics is required to be able to recognize the disaster risk. This research aim to identify the characteristics of the rural settlement on the coastal area in the District of Kulonprogo. This area is chosen based on the consideration of coastal morphological characters. This area have slopeslightly coastal zone which face to Indonesian Ocean. In this situation, hence in the event of tidal wave, there will be wide spread overflowing run up water. Two approaches is used in this research, they are; (1) Morphological Approach, and (2) Behaviour Approach. Both of the approaches is conducted with comparative perspective. The existance of the settlement which have been filtered through settlement and coastal tipology are compared. The data are collected and analyzed through: (1) Mapping and GIS tools; (2) survey method; (3) Indepth interview; and (4) statistical analysis. Thirty household are selected proportionally to setlement unit as a respondent in indepth interview. In order to analyze the data, descriptive analysis (frequency tables) and crossed tables are used. This research indicate that rural settlements on the coastal area in the District of Kulonprogo are spatialy distributed as a ribbon pattern. This pattern are coincident with the shape of the coast and the linearity of the road as well. Most of the buildings are in good condition, and they characterized by moderate housing density. In the term of coastal morphology, the research area is dominated by sandy coast with slopeslightly relief. Generally, the socio economic condition of the peoples living there are low to medium economic level, low education, and rarely medium income. Related to tidal flood vulnerability, this research area is the second level (moderate) hazardeous zone.

The Investigation of Groundwater Potential by Vertical Electrical Sounding (VES) Approach in Arguni Bay Region, Kaimana Regency, West Papua Santosa, Langgeng Wahyu; Adji, Tjahyo Nugroho
Forum Geografi Vol 21, No 1 (2007): July 2007
Publisher : Universitas Muhammadiyah Surakarta

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This research was conducted within some villages in the surrounding area that administratively including Arguni Bay District, Kaimana Regency, West Papua. The main objective of this study is to vertically measure resistivity value of aquifer with the intention of recognizing deep groundwater potency as a source of nativeâs domestic needs. In addition, VES method by Schlumberger electrode array was applied within 18 locations, which expectantly represent the whole area of research. The resistivity data is then interpreted by IP2Win 2.1 Geoelectric Software to entirely describe the aquifer system as well as the occurrence of groundwater. The result indicates that vertically, the aquifer system is dominated by interbedded of claystone and sandstone (argillite group) as a past marine environment mineral. In addition, geomorphological and resistivity sounding interpretation gives a viewpoint that the landforms of the research area may be typified as Structural Mountain with the slope direction is towards the island beaches. Also, structurally, the main groundwater system is fractured aquifer with very limited productivity of groundwater resources. As consequences, this aquifer is more to be an aquitard, rather than an aquifer.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v21i1.1820

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v21i1.1816

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