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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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Rural Depopulation Pattern at Yogyakarta Special Province (DIY) M Baiquni; Luthfi Muta’ali
Forum Geografi Vol 12, No 1 (1998)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v12i1.478

Abstract

Rural population in Yogyakarta Special Province (DIY), in the last two decades, have shown dramatical changes in its quantity and quality. Depopulation is one of the interseting hanges which may considered as unique in term of its spatial distribution. Rural depopulation is a nebulous phenomenon which many factors, actors, and other  phenomenon are involved in shoping depopulation. It is related to socio – economic hanges such as a) shifting economic structure and labour in rural areas from agricultural to non – agriculture sectors; b) growing urban economy leads by industry which may creates employment opportunities and adsorb labours or migrants; c) improving social development related to technological innovation, accessibility and resource availability. Besides the sicio – economic factors, physical geographycal factors may influence to depopulation pattern.This paper is based on a secondary data research i.e. statistical data at rural levels in Yogyakarta, thematics maps and other documents. Statistical methodes and map pattern analysis are employed to analysis data. The result of this research are as follows: a) the rural depopulation in DIY can be found in 189 rural areas of 393 rural areas (48.09%); b) the spatial distribution of the rural depopulation are in Gunung Kidul District (80 rural areas), Kulon Progo District (59 rural areas) Sleman District (33 rural areas), and Bantul District (17 rural areas); c) the rural depopulation in Yogyakarta at least related to six factors whih have been identified as out – migration, local resources, carrying capacity, geographycal location or accessibility, rural infrastructure, and service availability.
Spatial Analysis of Land Degradation Susceptibility and Alternative Plants for Its Rehabilitation Diah Auliyani; Tyas Mutiara Basuki; Wahyu Wisnu Wijaya
Forum Geografi Vol 33, No 1 (2019): July 2019
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v33i1.7499

Abstract

One of the drawbacks of developing plants for the rehabilitation of degraded land in Indonesia is the relative lack of information about species that are suited to the local conditions. Therefore, spatial information on land degradation and the plants suitable for rehabilitation is crucial. The objectives of this study were to map the susceptibility of land to degradation and to identify some alternative species for its rehabilitation. The research was conducted in Jang Watershed, Bintan Island, Kepulauan Riau Province, Indonesia. A quick assessment of land degradation was carried out to classify the degree of land susceptibility. The land suitability evaluation was conducted manually by matching the existing biophysical condition and plant growth requirements using a geographic information system. This analysis was applied for annual plants, such as Acacia mangium, Durio zibethinus, Artocarpus champeden, Theobroma cacao and Hevea brassiliensis. Furthermore, the maps of land susceptibility to degradation and species suitability were overlaid and the result was used to provide recommendations for rehabilitating the degraded land. This study showed that 22% of the Jang Watershed area can be categorised as highly susceptible to degradation. The suitability analysis illustrated that 59% of the degraded areas were suitable for Acacia mangium. The planting of fast-growing species such as Acacia mangium is expected to improve the physical, chemical and biological properties of the soil.
Lahars in Java: Initiations, Dynamics, Hazard Assessment And Deposition Processes Franck Lavigne; Jean-Claude Thouret; Danang Sri Hadmoko; Bambang Sukatja
Forum Geografi Vol 21, No 1 (2007): July 2007
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v21i1.1822

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.
Potensi Air Tanah pasca Gempa Tektonik di Lereng Merapi Daerah Klaten Jawa Tengah S Suharjo; Alif Noor Anna; Retno Woro Kaeksi; Yuli Priyana
Forum Geografi Vol 22, No 2 (2008): December 2008
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v22i2.4993

Abstract

The purpose of this research is to analyze the potency of land water in the post tectonic earchquake at Merapi slope in Klaten regency, Central Java. This research applies a survey method. The result of analysis is made based on the trilinier diagram, Stiff pattern, and the quality standard of drinking water. The collected data are in the form of land form, shallow land water data, suppressed land water, and well or spring. The results of the sesearch show that 1) the land form in Klaten is divided into four sets of landform, they are peak and slope of volcano, feet of volcano, fluvial palin under volcano, and a set of structural morphology. 2) The potency of land water can be tested based on the amount of land water and the quality of land water. The amount of land water in Klaten regency 260,502,274 m3/year or 727,618,722 liter/day. The amount of land water above is taken from free land water 73,301,436 m3/year, suppressed land water 34,138,520 m3/year, and land water taken from well or spring 153,062,784 m3/year. The quality of shallow land water in Klaten regency is proper to consume. 3) The distribution of upland water potency happens in the feet volcano land form, the potency of medium land water happens in the superficial of fluvial under volcano land form, and the potency of lowland water happens in the slope volcano land form and in the structural range of hills at Bayat subdistrict, 4) The tectonic earthquake gives serious effect toward morphological changes, land split, land subsident and the potency of land water in the fluvial plain of land form under volcano and structural range of hills in the area of Bayat subdistrict, and 5) In 2008, the needs of drinking water in Klaten regency is predicted around 1,164,000 people x 150 liter/day = 174,600,000 liter/day.
Bricks and Roof Crafting: Spatial Changes on Land and the Solution Alif Noor Anna
Forum Geografi Vol 10, No 2 (1996)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v10i2.510

Abstract

As a natural resource land has a strategic position in various development progress mainly as an infrastructure and means of settlement. At present it seems that land demand is getting increase adjusts to population growth and development rate. In connection to this question land problem has a close linkage in clay mining to obtain raw material of brick and tile. Clay as a manufactured raw material is usually extracted out from soil of agricultural field. Apparently, the clay mining has much changed physical and non physical condition, among others; lowering of land surface, reduction of soil fertility, micro relief changes, area constraction of groundwater charge supply, and there will be a decrease of flora and fauna variation at the operation area of the clay mining.
Spatio-Temporal Distribution of Landslides in Java and the Triggering Factors Danang Sri Hadmoko; Franck Lavigne; Junun Sartohadi; Christopher Gomez; D Daryono
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.
Analysis of Settlements along Abandoned Railway Tracks in Majalaya Subdistrict, Bandung Regency, Indonesia Septi Sri Rahmawati; Sudrajat Sudrajat; Sri Rum Giyarsih
Forum Geografi Vol 34, No 1 (2020): July 2020
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v34i1.10924

Abstract

Settlements in urban areas expand as the population grows and are influenced by growth centres. This research was designed to identify the quality of informal settlements along abandoned railwaytracks in the Majalaya District, an industrial centre in Bandung Regency, Jawa Barat Province, Indonesia. A quantitative method was employed, with proportional random sampling and the use of  both primary and secondary data. The primary data referred to the conditions of the slum areas, while the secondary data were images, Regional Spatial Planning (RTRW) documents and RTRW maps. The quantitative analysis employed scoring through slum settlement assessment indicators, while spatial analysis was supported by regional data. The results from the research show that although housing construction quality varies, most settlements are illegal and prone to flooding, fire, and contagious diseases. The research should be beneficial for the government in promoting and implementing slum eradication programmes in urban areas.
The Distribution of Salted Groundwater and the Impact to Settlement Areas in Grogol Sub District S Suharjo
Forum Geografi Vol 6, No 2 (1992): December 1992
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v6i2.394

Abstract

This research is aimed at studying the ground water salinity and the geographicaal aspect of Grogol subdistrict area. This study, therefore, dials withs (a) the ground water salinity and the factors influencing; (b) the classes of land suitability for settlement in Grogol subdistrict; and (c) the influences of the ground water salinity to the suitability of sattlement areas. This research put its emphasis on the geomorphological approach and uses lends units as the basis of its studt. The research area consists of four landform units and nine land units. From land unit maps, we can make the distribution maps of the ground water salinity and its influences to the suitability between settlement and the level suitability for settlement data. The ground water salinity data are obtained by measuring in the field and laboratory analysis. The result of this research shows that the distribution of the ground water salinity is located in the landform unit of the old floid and in the deposition processes. The distribution of the ground water salinity in the research area does not influence the growth pattern of settlement but influences the physical building.
Analisis Fluktuasi Hujan dan Morfologi Sungai terhadap Konsentrasi Banjir Daerah Surakarta Alif Noor Anna; S Suharjo; Munawar Cholil
Forum Geografi Vol 25, No 1 (2011): July 2011
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v25i1.5033

Abstract

This research aims to analyse rain fluctuation and river morphology to flood concentration in Bengawan Solo River, Surakarta. The method of this research is field survey supported by secondary data analysis. The survey was conducted using GPS (Global Positioning System). The result indicates that high intensity rainfall in the research area happened during October till April. River flow in dry season generally decreased in accordance with the distribution of low rainfall (dry month). Whereas, river flow rates seen to increase along with the rainfall that occurs in the rainy season. Other result show that point 11-18 (location in Tanjung village district of Sukoharjo till Semanggi village district of Pasar Kliwon) very superficial which became impact of the river. The point represent floods concentration, therefore if there is rain with high quantity, the water will rise and overflow to surface, especially point 11, 13, and 16 (Tanjung, Kedunggudel, and Telukan village district of Sukoharjo). The processes that occurred at these sites are sedimentation, and lateral erosion (horizontal erosion).
The Influence of Social-Economic Condition of People to Landuse Change and the Influence of Landuse Change to Runoff at Bodri Watershed, Kendal Riani Laviati; Alif Noor Anna; Suharjo Suharjo
Forum Geografi Vol 17, No 1 (2003)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v17i1.592

Abstract

This study is carried out in chacthment area of Bodri. The goals of this study are to kno the influence of economic social condition of population on the change of the kind of landuse and the influence of the change of the kind of landuse on the run-off area. This study uses survey method. The collected data are the economic social data of the population and the physical condition data in the research area. The result of the study shows that the economic social condition of the population in chatchment area of Bodri influences on the decrease of landuse. The decrease in landuse is 22.27% which used settlement, dry land cultivation (3.14%), yard (1.07%), plantation (0.44%), wet land cultivation (2.28%), embankment (0.25%), street and others (6.73%). The decrease in landuse causes peak discharge of Hydrograph in 1997, 1999, 2000, and 2001 increases respectively 87.32 m/second, 101.26 m/second, 58.37 m/second, 89.82 m/second, with each volume of direct flow 7.123.392 m, 6.011.604 m, 11.784.672 m, and 9.459.954 m. The run-off coefficient in 1992, 1997, 1999, 2000, and 2001 increase 7.7%, 13%, 19.8%, 23.2%, and 27.03%, with coefficient of annual flow 46.98%, 72%, 55.21%, 61,79%, and 75.55%. The increasing of the run-off coeficient and annual flow describes that the ratio both the discharge of maximum and minimum monthly flow becomes bigger. It means that in rainy season it will be flood immediately and in dry season it will be drought easily.

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