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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
 97   98   99   100   101 
Evidence Based Landslide Hazard Mapping in Purworejo using Information Value Model Approach Sudaryatno Sudaryatno; Prima Widayani; Totok Wahyu Wibowo; Bagus Wiratmoko; Wahyu Nurbandi
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.v33i1.7592

Abstract

Purworejo District, which is located in Central Java, Indonesia, is prone to landslides. These are a natural hazard that often occur in mountainous areas, so landslide hazard analysis is needed to develop mitigation strategies. This paper elaborates on the use of an evidence-based statistical approach using the Information Value Model (IVM) to conduct landslide hazard mapping. The parameters of slope, aspect, elevation, rainfall, NDVI, distance from rivers, distance from the road network, and distance from faults were employed for the analysis, which was conducted based on a raster data environment, since the pixel is the most appropriate means to represent continuous data. Landslide evidence data were collected by combining secondary data and interpreting satellite imagery to identify old landslides. The IVM was successfully calculated by combining factors related to disposition to landslides and data on 19 landslide occurrences. The results helped produce a landslide susceptibility map for the northern and eastern parts of Purworejo District.
The Investigation of Groundwater Potential by Vertical Electrical Sounding (VES) Approach in Arguni Bay Region, Kaimana Regency, West Papua Langgeng Wahyu Santosa; Tjahyo Nugroho Adji
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.
Degradasi Hutan Bakau Akibat Pengambilan Kayu Bakar oleh Indutri Kecil Gula Kelapa di Cilacap T Tumisem; S Suwarno
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.v22i2.4989

Abstract

A study on degradations mangrove forest due to firewood exploitation by coconut palm sugar home industry in Cilacap. Information on social economic aspect and respons of coconut palm sugar home industry to using fuel substitutions were collected by using a questioner. The potential of mangrove as a firewood source was estimated by quadrat method. The study has been carried out on dry and rainy season. The wood production of available 8000 ha of mangrove from Cilacap primarily Rhizophora apiculata Linn and Rhizophora mucronata Lamk were 3.249.920 m³. The results showed that the declining of mangrove was about 19,250 m² in dry season and 26,551 m² in rainy season, this was correlated with the amount of nira to be processed that was 0,782 m³ in dry season and 1,079 m³ in rainy season. Deforestation of mangrove forest due to change of mangrove zonation. Rhizophora apiculata Linn and Rhizophora mucronata Lamk will be domination Nypa fruticans that is shown superficiality to continent form.
Peranan Kota Kecil dalam Pengembangan Wilayah Muhammad Musiyam
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. 
Specific Peak Discharge of Two Catchments Covered by Teak Forest with Different Area Percentages Tyas Mutiara Basuki; Rahardyan Nugroho Adi; Wahyu Wisnu Wijaya
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.v31i1.3236

Abstract

In watershed area, forest has important roles in relation with peak discharge. This  research was conducted to study the impacts of teak forest on peak discharge. On-screen digitizing of IKONOS imagery was done to classify the land cover of the study area. Kejalen and Gagakan catchments covered by old teak forests by 74% and 53% respectively, were chosen as the study area. These catchments are located in Blora Regency. Automatic streamflow recorder was set at the outlet of each catchment and subsequently, peak discharges were examined from the recorded data. During the observation, there were 36 evidences of specific peak discharge. The results showed that a trend of lower peak discharges occurred in Kejalen catchment which has the higher percentage of teak forest area  in compared to Gagakan catchment with lower percentage of teak forest area, except when extreme rainfalls happened. At rainfall of 163 mm/day, specific peak discharge in Kejalen was higher than in Gagakan catchment. Although there is a relationship between specific peak discharge and the percentage of forest cover area, the increase of specific peak discharge is not only affected by forest cover, but also affected by daily rainfall, antecedent soil moisture, and rainfall intensity. Coefficients of determination between specific peak discharge and daily rainfall are 0.64 and 0.61 for Kejalen and Gagakan catchments, respectively.
Comparison of Stream Characteristics of Forested Subwatershed and Deforested Watershed in Mangunan Area, DIY S Sudarmadji
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.
Pengembangan Ruang Terbuka Hijau berdasarkan Distribusi Suhu Permukaan di Kabupaten Bandung Siti Badriyah Rushayati; Hadi S. Alikodra; Endes N. Dahlan; Herry Purnomo
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.v25i1.5027

Abstract

Bandung Regency is experiencing increased of air temperature, particularly in the urban area. High air temperature in urban areas is caused by increasing built-up areas and declining green open space. Green open space should be built to lower air temperature and to create a comfortable micro climate. Green open space should be developed at locations with high air temperature to reach its efficacy. This research used spatial analysis to generate air temperature distribution map. The map was used as the basis in developing green open space. The map showed that green open spaces should be developed at several sub-districts, namely Margahayu, Margaasih, Dayeuhkolot, Baleendah, Bojongsoang, Rancaekek, Cileunyi, Pameungpeuk, and Majalaya sub-districts.
Flood Modelling of Banjir Kanal Barat (Integration of Hydrology Model and GIS) Muhammad Aris Marfai
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.
Ruang, Lingkungan dan Wilayah: Suatu Konsep Dasar Geografi D Dilahur
Forum Geografi Vol 5, No 2 (1991): December 1991
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v5i2.4675

Abstract

Sejarah perkembangan geografi mencatat lima sudut pandang yang berpengaruh luas dalam perkembangan pemikiran geografi yaitu, determinisme dari Friedrich Raizel, possibilisme dari Paul Vidal de La Blache, waktu dan bentang lahan dari Sauer, studi wilayah dari Hartshorne dan keruangan dari Schaefer. Kelima sudut pandang tersebut melahirkan tiga pendekatan utama dalam geografi saat ini yaitu sudut pandang keruangan, sudut pandang lingkungan dan sudut pandang kompleks wilayah. Pemhahasan tentang hakekat ruang, lingkungan dan wilayah menunjukkan bahwa ketiga sudut pandang tersebut merupakan satu kesatuan sudut pandang atau pendekatan geografi. Waktu merupakan dimensi keempat dalam geograji oleh karenanya setiap permasalahan barus dilihat dari segi dinamika keruangan, dinamika lingkungan dan dinamika kompleks wilayah.
New Settlement Areas at Forbiden Zone of Merapi Volcano (Case at Srumbung, Magelang) Su Ritohardoyo
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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