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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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Surface Water Hydrology Conditions in Alabio Polder for Irrigation Soewarno, Soewarno
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.v12i1.485

Abstract

The Alabio polder irrigation which area of 6000 ha is situated at the Negara river basin in Kalimantan Selatan province, consist of agricultural land which major part is approximately used for paddy-fields (60%), swamp zone (30%), and other (10%). During rainy season are usually flooded, which water level of 0,50 – 1,50 m above the ground surface. The flooding is due to the slight slope of the Alabio, Panggang, and Negara river. During field investigatiton period from Desember 1989 to Pebruary 1990, inflow discharge measured in the Tabukan intake was 14,9 – 17,1 m3/det, which water elevation was 2,62 – 2,74 m MSL, in Mahar intake was 0,52 – 2,67 m3/det, which water elevation was 2,94 – 3,25 m MSL. The outflow discharge measured in the Kalumpang drainage main canal was 1,68 – 17,1 m3/det, and in the Luang drainage canal was 13,62 – 16,92 m3/det. The Alabio Polder outside slope was 0,00011 – 0,00025, the inside slope was 0,00002 – 0,00010. The difference of water level elevations for the various discharge in the Alabio canals network is due back water in the downstream Polder area. Sedimentation was accour in the intake and drainage canals. The chemical analyze show that surface water meet to the standard for irrigation. The hydrologycal optimation and water balance study should be necessary.
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

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

Abstract

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 native’s 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.
The Ready System of Clean Water for Population in Musuk District to Respon Dry Season Priyana, Yuli; Safriningsih, Dina
Forum Geografi Vol 19, No 1 (2005): July 2005
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v19i1.4566

Abstract

This research about ready system of clean water in District of Musuk, Sub-Province of Boyolali. This research aim to study how ready system of clean water, research area especially of dry season. That wish to know how much amount of resident drinking water consumption at area District of Musuk. The method of research in this research is survey method. The data which collected in this research consist of primary data result of interview by 150 responded (head of house hold) and perception in field. Secondary data an obtain from governmental institution, books, other resource person and reference related to this topic of research. Intake of sample done with area of random sampling, to know the target of research to description analyses and tabulation. The result of research indicate that ready system of clean water at dry season most relying on rainwater with accommodating the rainwater at pools, besides to overcome water of water supply of rain of society buy water of springs pass tank truck, small to partly use surface water and also of PDAM. Water consumption at mean dry season 48.47 liter/day/capita. But at high area (volcanic slope) its slimmer consumption in comparing plain area of Fluvial foot/feet of Volcano.
Peranan Kota Kecil dalam Pengembangan Wilayah Musiyam, Muhammad
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.v10i2.508

Abstract

Tulisan ini berusaha untuk mengidenfitikasi peranan kota kecil (small towns) dalam pengembangan wilayah, terutama wilayah pedesaan. Bahasan dimulai dari pertama, konsep keterkaitan; kedua pendekatan peranan kota kecil dalam pengembangan wilayah pedesaan, dan diakhiri dengan bahasan megenai pendekatan saling ketergantungan antara kota kecil dengan pedesaan. Pengetahuan mengenai keterkaitan dapat membantu dalam mengidentifikasi sifat dan dampak interaksi antar kegiatan ekonomi. Secara teoritis, keterkaitan baik antar sektor maupun dalam sektor dapat terjadi melalui berbagai cara. Keterkaitan secara vertikal, yakni keterkaitan yang tercipta karena kerja sama atau hubungan antara perusahaan kecil dengan perusahaan besar. Keterkaitan dapat terjadi pula melalui keterkaitan konsumsi (consumption linkages) dan keterkaitan produksi (production linkages). Bentuk keterkaitan lainnya adalah keterkaitan keruangan, yang mencerminkan luasnya pengaruh sebuah perekonomian dan sebagai petunjuk adanya interaksi ekonomi antar wilayah. Berdasarkan pada serangkaian kajian mengenai keterkaitan desa kota, setidaknya ada dua hal yang perlu diperhatikan. Pertama, pertumbuhan kegiatan sosial ekonomi di pedesaan dan kota kecil merupakan dua hal yang saling bergantung. Oleh karenanya, kajian mengenai keterkaitan desa – kota disamping perlu dilihat dari perspektif kota, juga perlu dilihat dari pespektif desa. Kedua, keterkaitan desa – kota, di samping bervariasi antara wilayah satu dengan lainnya, secara internal juga menunjukkan variasi keterkaitan antar kelompok masyarakat, tergantung dari konteks regional, ekonomi, dan sosial. 
Aplikasi ESDA untuk Studi Variabilitas Spasial Hujan Bulanan di Jawa Timur Indarto, I
Forum Geografi Vol 25, No 2 (2011): December 2011
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v25i2.5044

Abstract

This article expose the spatial variability of monthly-rainfall (MR) in East Java region. Monthly rainfall data were collected from 943 pluviometres spread around the regions. Spatial statistics analysed by means of ESDA (Exploratory Spatial Data Analysis) techniques available on Geostatistical Analyst extention of ArcGIS (9.3). Statistical tools exploited to analise the data include: (1) Histogram, (2) Voronoi Map, and (3) QQ-Plot. The result show that histogram and QQ-Plot of Monthly Rainfall data are leptocurtosis. Statistical value obtained from the analysis are: minimum = 54 mm/month, average = 155,5 mm/month, maximum = 386 mm/month, and median = 150 mm/month. Other statistical value summarised are: standard deviation = 44,2 ; skewness = 0,95; and curtosis = 5,09. Finally, monthly rainfall-maps are produced by interpolating the data using Inverse Distance Weighed (IDW) interpolation method. The research demonstrate the capability and benefit of those statistical tool to describe detailed spatial variability of rainfall.
Comparison of Stream Characteristics of Forested Subwatershed and Deforested Watershed in Mangunan Area, DIY Sudarmadji, S
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.v6i2.392

Abstract

Land use changes from forested  into unforest catchment result negative effects to the environment, including to the hydrological and soil condition of the area. To improve the hydrological and soil conditions serious attemps are required, and they take a long period to realize. The Mangunan Girirejo area (which is located in the Bantul regency, Yogyakarta Special Province) is one of pilot projects managed by the Gadjah Mada University. Among it’s activities the project tried to improve critical land by reforesting the area with  some kinds of plant. From the hydrological points of view this attemps should be evaluated, by comparing runoff from two adjacent catchments having similar conditions expect those on the land use. One of them is forested catchment, while the other is unforest catchment. The study  was conducted in the Mangunan Girirejo area using two small subcatchments. The forested subccatchment used for the study having an area 2.225 hectares. The forested subcatchment in now mostly covered by the pinus mercusii, acacia auliculiformis and malaleuca leucacendra, while the unforested subcatchment is used for the dry field ultivation, and dominantly casava, beam, and corn were planted in the subcatchment. About three month was needed for observing hydrological parameters (from January to March 1993). During the research some hydrological component such as rainfall, overlandflow, seepages, and runoff were observed. Rainfall in the study area generally  having less than 100 mm depth, falling in shorter than 4 hours duration. As an input in the hydrological system of the subcatchment, the rainfall did not always result runoff. In the forested subcatchment rainfall did not always result runoff. In the forested subcatchment rainfall higher than 10 mm depth result runoff, while in the unforested subcatchment the 5 mm rainfall is concidered as minimum rainfall to result runoff. The runoff hydrolographs of the two subcatchment having different characteristics. Although they have quick rise, the time of rise in the unforested subcatchment is shorter that those to the forested subcatchment. The hydrographs of the forested subcatchment have lower peaks than the unforested subcatchment, however the time base of hydrographs in the unforested subcatchment are longer. Chemical substances those which dominated the rock forming minerals (Ca, Mg, Na, K, HCO3, SO4, and SiO2) significantly increased from rainfall to runoff. The highest concentration found in the surface runoffand seepages. However if the one compared the concentration of the chemicals in the water originated from forestsed and underforested watershed he may say that the concentration of the chemical in water from unforested subcatchment is generaly higher than those from the forested subcatchment is generaly higher than those from the forested subcatchment. Runoff draining from unforested subcatchment having a higher SO4 and PO4 concentration sompared to those originated from forested subcatchment. The high concentration of the substances may bee caused by use of fertilizer by farmers in the unforested subcatchment.
Pengenalan Proses Citra secara Digital Widjojo, Suharto; Rusmanto, Adi; Suharjo, S
Forum Geografi Vol 6, No 1 (1992): July 1992
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v6i1.4698

Abstract

Teknologi penginderaan jauh telab berkembang dengan pesat di Indonesia semenjak awal 1970-an. Berbagai jenis aplikasi telah diterapkan baik oleh instansi pemerintah maupun swasta. Pada awal penggunaannya teknologi interpretasi yang dominan dipergunakan oleh para pemakai adalah interpretasi secara visual. Sejalan dengan perkembangan teknologi komputer, analisa citra berkembang pula ke arah digital. Makalah ini mencoba mengenalkan teknologi interpretasi secara digital yang memungkinkan data tersebut diintegrasi dengan sistem informasi geografi yang terus berkembang di Indonesia.
Flood Modelling of Banjir Kanal Barat (Integration of Hydrology Model and GIS) Marfai, Muhammad Aris
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.v17i1.590

Abstract

Hydrological modelling has an advantage on river flood study. Hydrological factors can be easily determined and calculated using hydrological model. HEC-RAS (Hydrological Engineering Centre-River Analysis System) software is well known as hydrological modelling software for flood simulation and encroachment analysis of the floodplain area. For spatial performance and analysis of flood, the integration of the Geographic Information Systems (GIS) and hydrological model is needed. The aims of this research are 1) to perform a flood encroachment using HEC-RAS software, and 2) to generate a flood hazard map. The methodology for this research omprise of 1) generating geometric data as a requirement of the data input on HEC-RAS hydrological model, 2) Hydrological data inputting, 3) generating of the flood encroachment analysis, and 4) transformation of flood encroachment into flood hazard map. The spatial pattern of the flood hazard is illustrated in a map. The result shows that hydrological model as integration with GIS can be used for flood hazard map generation. This method has advantages on the calculation of the hydrological factors of flood and spatial performance of the flood hazard map. For further analysis, the landuse map can be used on the overlay operation with the flood hazard map in order to obtain the impact of the flood on the landuse.
Acknowledgement for Reviewers in 2017 Forum Geografi, Editors
Forum Geografi Vol 31, No 2 (2017): December 2017
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v31i2.5557

Abstract

New Settlement Areas at Forbiden Zone of Merapi Volcano (Case at Srumbung, Magelang) Ritohardoyo, Su
Forum Geografi Vol 14, No 2 (2000)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v14i2.444

Abstract

One of the chronicle problem in the disaster control of volcano eruption is the resettlement of relocated or transmigrated people to prohibitive region of the volcano. The more serious problem is happened when some of the labourers sand and stone mining living in those prohibitive region. Starting from those stated sttlement problem, this research aims at exposing the change, process, and continuity of setlement in the prohibitive region. This study employs so called sampling technique. Quota sampling is carried out according to village type. Two agricultural and mining village types in the prohibitive region are selected representing the sampling areas, encompassed administrative divisions of Srumbung subdistrict. The number of respondents are 60 households, selected unproportionally based on the village type. Primary data is collected diret communication with informants are key persons. Data analysis employs frequenccy and cross tabulation, and t test analysis. The study reveals that settlement changes in prohibitive region of Merapi vulcano has been fluctuatively recorded since 1006 based on the strength of Merapi vulcano eruption. However intensively settlement changes as an impact of the Merapi vulcano eruption have been recorded sine 1930 up to 1975 followed by more than 1742 people be dead as a victims and environment deterioration. The eruptions in 1954 and 1969 have resulted in drastically changes of physical and administrative condition village of Kaligesik and Gimal. At least 9 hamlets in both villages have been destroyed by ‘nue ardente’ and cold lava. Those eruptions have than change the administrative status of villages to be. Resettlement process within two hamlets in prohibitive region have taken place due to differences in origin area of the shelter, motivation to settle, and settlement pattern. Those two settle in mining villages are mining are mining labourer and mostly comes from outer subdistricts or districts, whereas those who stay in agriculture village are local people. The latter mostly joined transmigration program, which are supposed to stay in outer islands. A part from origin area, the difference of two settlers is also indicated by motivation. Economic motives are more dominant for those who settle in mining village than those who settle in agriculture village. The latter tend to have social motives to stay. The difference in settlement pattern between the vilages lays in ‘intermediary settlement’. This means that mining settlers have previously stayed in transmigration area. The duration to stay is between 15 to 20 years as compared to  mining settlers whose duration to stay are between 5 to 10 years. Although the average household monthly inome  in the respective two vilages is relatif the same (i.e. Rp 323,366 in Kaligesik and Rp 335,557 in Sumberejo), the physical condition of housing in Sumberejo look a little better than in Kaligesik. Despite the respective differences, people in the two villages tend to stay permanently. This means that the effort to vacant these prohibitive region will become more difficult.

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