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Forum Geografi
ISSN : 08520682     EISSN : 24603945     DOI : -
Core Subject : Science,
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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Articles 7 Documents
Search results for , issue " Vol 22, No 1 (2008): July 2008" : 7 Documents clear
Analisis Morfometri dan Morfostruktur Lereng Kejadian Longsor di Kecamatan Banjarmangu Kabupaten Banjarnegara Priyono, Kuswaji Dwi; Priyono, P
Forum Geografi Vol 22, No 1 (2008): July 2008
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v22i1.4926

Abstract

The aims of this research are: (a) to study and classify the landslide hazard level, and (b) to analysis morphometry and morphostructure slope at occurrence slides in the research area. The sampling method applied in this research was stratified sampling, landform units were applied as strata. The sample within strata was determined according the landslide hazard based factor that caused landslides. Analysed of morphometry and morphostructure conducted in described of landform units. The landslide location was mapped by determining landslide point with Global Position System (GPS), and morphometry slope analysis in three images with Digital Elevation Model (DEM) analysis. The results showed that the degree of landslide hazard in the research area could be classified into 9 units landform with 5 landslide hazard level, from very low until very high. At very high landslide hazard existed occurrence landslides at most, whereas at very low landslide hazard existed occurrence at least. From slope morphometry aspect, the point of the most landslide case is in mountain midle slope (11), lower slope (9), and upper slope (5). Flows type, soil fall, and rockfall all happen in lower slope. Landslide types almost (80%) happen in lower slope, whereas slump type happen in upper, middle, and lower slope. From slope form aspect, 70% landslide cases happen in concave slope position and slope classes 3-5 (>9%). From morphostructure aspect, the research area hasn’t difference because of weathering level and litology structure condition which is relatively similar. Concave and aslant slope condition become the concentration point of surface flow water and under surface which are predicted be the most influence factor that cause landslide.
Evaluasi Potensi Degradasi Lahan dengan Menggunakan Analisa Kemampuan Lahan dan Tekanan Penduduk terhadap Lahan Pertanian di Kecamatan Kokap Kabupaten Kulon Progo Sartohadi, Junun
Forum Geografi Vol 22, No 1 (2008): July 2008
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v22i1.4921

Abstract

Kokap sub district is located in Kulonprogo District, Yogyakarta Province. It has some problems of landslides and misuse of land. The research was proposed to determine the regions having potential of land degradation based on the land capability and population pressure analysis. This research was carried out using field survey. The field survey was based on landform unit as area sampling unit. The (Land Classification and Land Use Planning) LCLP software was applied for land capability classification. The Soemarwoto method was applied for the evaluation of population pressure on the agriculture land. The results of this research were: (1) land capability in the study area was varies from class II – class VII with limitation factors of slope, soil erodibility, soil texture, soil permeability and soil effective depth, (2) the whole study area fell into high population pressure class (that means it had exceed of its land capability), (3) most of the study area (51.9%) had been classified into high potential of land degradation.
Analisis Keruangan Terhadap Perubahan dan Persebaran Permukiman Kumuh di Kecamatan Banjarsari Kota Surakarta Tahun 2001-2005 Dahroni, D
Forum Geografi Vol 22, No 1 (2008): July 2008
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v22i1.4928

Abstract

Since the year 1998 up to the mid of 2005, in the district ofBanjarsari, there happened an increasing amount of slum areas which might endanger the environmental balance. This research aims at (1) identifying the shift of distribution pattern from the settlement diffusion in the district of Banjarsari Surakarta in the year 2001-2005. (2) Identifying the alteration form of the unoccupied land into slum areas in the district of Banjarsari Surakarta. (3) Identifying the characteristics of slum area dwellers in the district of Banjarsari Surakarta. This research uses the survey method, secondary data analysis and map analysis. The data ar alysis used is tlie closest neighbor analysis, table of frequency, crossed tables and descrip ave analysis. The result shows that (1) the distribution pattern of the slum areas appeared in the district ofBanjarsari in the year 2001 is the random distribution pattern while the one in 2005 is the dissemination pattern. Such pattern indicates the grc wing amount and interraction with the means of transportation and economic condition in those slum areas. (3) The lands which are altered into slum areas in the district of Banjarsari during 2001-2005 take place in the unoccupied areas owned by the state.(3) The distribution of age among the slum area inhabitants is around 41-61 years of age (49%) while tb biggest amount is the new arrivals (57%). The region of Sub province Sragen has the bigges percentage in the distribution of the city inhabitants origin in the district of Banjarsari. Regionally, the inhabitants who come from the hinterland of Surakarta or ex Surakarta residency took the amount lof 73.68%. The highest percentage of educational level of the slum area inhabitants in the district of Banjarsari is the uneducated residents or those from low education level (55%). Most of the respondents occupations of the slum area dwellers in Banjarsari are in the informal sectors (82%) The number of family member in the district of Banjarsari is around l-
Community Based Warning and Evacuation System against Debris Flow in the Upper Jeneberang River, Gowa, South Sulawesi Hardjosuwarno, Sutikno
Forum Geografi Vol 22, No 1 (2008): July 2008
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v22i1.4922

Abstract

Gigantic collapse of the Caldera wall of Mt. Bawakaraeng (2,830 m) in March 2004 had supplied the sediment volume of 230 million to the most upper stream of Jeneberang River, which flowed down to the lower reach in the form of debris flow which is triggered by rainfall. The purpose of the research is to provide a system which is able to forecast the occurrence of debris flow, to identify the weak points along the river course, to identify the hazard areas and how to inform effectively and efficiently the warning messages to the inhabitants in the dangerous area by using the existing modern equipment combined with the traditional one. The standard rainfall which is used to judge the occurrence of debris flow was established by Yano method. It is based on the historical data of rainfall that trigger and not trigger to the occurrence of debris flow which is widely used in Japan so far. The hazard area was estimated by Two-Dimensional Simulation Model for debris flow, the debris flow arrival time at each point in the river were estimated by dividing their distance from reference point by debris flow velocity, where the check dam no. 7-1 in Manimbahoi was designated as reference point. The existing evacuation routes were checked by field survey, the strength and coverage of sound for kentongan and manual siren were examined using sound pressure level at the location of the existing monitoring post and the effectiveness of warning and evacuation were evaluated by comparing the warning and evacuation time against the debris flow arrival time. It was resulted that debris flow occurrence was triggered by short duration of high rainfall intensity, long duration of low rainfall intensity and the outbreak of natural dam which is formed by land slide or bank collapses. The hazard area of upper Jeneberang River are mostly located on the river terraces where the local inhabitants earn their living through cultivating the river terraces as paddy fields, dry field and sand mining. It was also resulted that at the elevation of 700 m to the upper stream, the arrival time of debris flow is too short (< 3 minutes), it means that there is no time to evacuate when debris flow occurs. There are enough time to evacuate along the reaches between 700 m to 390 m and more time to evacuate along the downstream of 390 m river bed elevation due to the longer arrival time of debris flow. The existing community based warning system against debris flow uses radio transceiver to communicate between post and uses kentongan and sirens to propagate the warning message to inhabitants. Based on the sound test conducted in Jeneberang River, the manual siren has a coverage of 160 m to 600 m and it can be used in the warning system, being co-existence with the kentongan which has been used for a long time. In order to keep the community based warning system well functioned, it is recommended to synergize between the Local Government of Gowa Regency and the other stake holders with the inhabitants along Jeneberang River and the Sabo Community of Jeneberang in the operation and maintenance of the system.
Akurasi Metode IDW dan Kriging untuk Interpolasi Sebaran Sedimen Tersuspensi Pramono, Gatot H.
Forum Geografi Vol 22, No 1 (2008): July 2008
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v22i1.4929

Abstract

Physical conditions of seawater in coastal area can be studied by sampling at several locations. To perform spatial analysis, the data should be interpolated to get the values between sample points. Several approaches for interpolation may result in different outcomes. The purpose of this research is to compare Inverse Distance Weighted (IDW) and Kriging methods. Their parameters are studied using the total suspended sediments in Maros area, South Sulawesi. The results show that the more accurate interpolation is obtained by using IDW method than using Kriging method.
The Influence of Spatial Urbanization to Regional Condition in Periurban Areas of Yogyakarta Kurniawan, Andri; Prakoso, Bambang Sriyanto Eko
Forum Geografi Vol 22, No 1 (2008): July 2008
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v22i1.4924

Abstract

It is interesting to study periurban areas because of its transitional characteristic. Periurban areas undergo dynamic changes as a result of spatial urbanization. This study is aimed at: (1) examining the development pattern of spatial urbanization in Yogyakarta and finding out the influential determinant factors; (2) examining the dynamics of land use changes in periurban areas and finding out the resultant impacts; (3) examining the pattern and development of services (infrastructures) and finding out the determinant factors supporting the development of services (infrastructures) in periurban areas; (4) examining the role of the development of periurban services (infrastructures) as magnetic forces for periurban development; and (5) making policies concerning periurban development and management in order to achieve optimal development and to balance the functions of urban and rural areas. The methods used in this research are secondary data analyses and aerial photo interpretation. This study applies secondary data analysis by comparing the data to find out the extent of the changes. Descriptive statistics, scaling, and discri-minant analysis are used as the analytical techniques to find out the determinant factors of urban growth in periurban areas. Spatially, urbanization in Yogyakarta periurban areas tends to move toward the western part (Ngestiharjo village), northern part (Catur Tunggal village) and eastern part (Banguntapan village). Besides centrifugal forces, the development of built land and urban characteristics in the western, northern and eastern parts are also influenced by the main roads (corridors) from Yogyakarta to Kaliurang, from Yogyakarta to Wates, and from Yogyakarta to Solo. The existence of the corridors prompts the functions of trade and services which, in turn, trigger the development of the surrounding housing complex. On the contrary, in the southern and south-east part of Yogyakarta the activities of service have not yet well-developed and neither have the new housing complex. The development of number and density population are variables determining urban development in Yogyakarta periurban areas. The dynamics of land use changes in Yogyakarta periurban areas are characterized by the decrease in agricultural land (6.46 % per year) and the increase in built land. The decrease in agricultural land reduces the sustainability of agricultural environment. Agricultural production can no longer satisfy periurban people’s needs for food. The different strength in interaction results in the difference in the facilities of service (infrastructure) between periurban areas. The periurban dynamics in Yogyakarta are also characterized by the increase in function and sustainability of services. The development of service (infrastructure) in Yogyakarta periurban areas have a lot of impacts especially those related to the increase in urban characteristics. In some parts of periurban areas, there is a relation between the increase in service provision and the development of urban characteristics.
Analisis Preferensi Visual Lanskap Pesisir Daerah Istimewa Yogyakarta untuk Pengembangan Pariwisata Pesisir Menuju pada Pengelolaan Wilayah Pesisir Berkelanjutan Khakhim, Nurul; Soedharma, Dedi; Mardiastuti, Ani; Siregar, Vincentius P.; Boer, Mennofatria
Forum Geografi Vol 22, No 1 (2008): July 2008
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v22i1.4925

Abstract

The aim of this research is to analyze of DIY coastal landscape with visual preference analysis for suistanble coastal tourism development and management. The unit of analysis that used is coastal typology. The guideline in deciding the classification of coastal typology is using the Response-Process System with relief/slope, main constructing material, genesis process and dominate process happened in the meantime such as tide, wave and river flow. This response-process system divide the coastal typology into seven classes including coastal typology of land erosion coast, sub aerial deposition coast, volcanic coast, structurally shaped coast, wave erosion coast, marine deposition coast and coast built by organism. The method of SBE (Scenic Beauty Estimation) is used for visual preference analysis, and the method used to compose the policy of costal tourism development is SWOT method. Result shows that all seven coastal typology are found in the coastal area. Land erosion coast and coast built by organism dominate in Gunungkidul coastal area and then in Bantul and Kulon Progo coastal area are dominated by marine deposition coast and sub aerial deposition coast. Volcanic coast, structurally shaped coast, wave erosion coast can only be found in a small area of Gunungkidul coast. Each of this coastal typology has a special land characteristic which can be used to develop its potential. Coast built by organism is very suitable for tourism activity proved by the high score of SBE from the respondents. Recommendation for developing coastal area in area of interest is by developing the coastal natural resources suitable to its physical typology, because this will make the management of coastal area for continuous development easier. Recommendations for coastal management in Gunungkidul including mapping and classification of protected karst area and mineable karst area to secure the run of coastal area management, for coastal management in Bantul using Managed realignment which plans for retreat and adopts engineering solutions that recognise natural processes of adjustment, and identifying a new line of defence where to construct new defences and move seaword model by constructing new defenses seaward the original ones. Last, for Kulon Progo coastal area using hold the line model whereby seawalls are constructed around the coastlines.

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