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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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The Run up Tsunami Modeling in Bengkulu using the Spatial Interpolation of Kriging Technique Mayasari, Zulfia Memi; Fauzi, Yulian; Suwarsono, Suwarsono
Forum Geografi Vol 28, No 2 (2014): December 2014
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v28i2.427

Abstract

This research aims to design a tsunami hazard zone with the scenario of tsunami run-up height variation based on land use, slope and distance from the shoreline. The method used in this research is spatial modelling with GIS via Ordinary Kriging interpolation technique. Kriging interpolation method that is the best in this study is shown by Circular Kriging method with good semivariogram and RMSE values which are small compared to other RMSE kriging methods. The results shows that the area affected by the tsunami inundation run-up height, slope and land use. In the run-up to 30 meters, flooded areas are about 3,148.99 hectares or 20.7% of the total area of the city of Bengkulu.
Pembangunan dan Ruang: Tinjauan Kritis terhadap UU Penataan Ruang Effendi, Tadjudin Nur
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.v6i1.4689

Abstract

Tulisan ini membabas tentang implikasi kebijakan undang-undang penataan ruag terhadap aspek spsio-kultural. Bahasan difokuskan pada konsepsi ruang dan dampak pada aspek sosio-kultural. Disimpulkan babwa undang-undang penataan ruang cenderung menerapkan konsep teritorial. Undang-undang penataan ruang cenderung melamabkan fungsi kontrol hukum adat/aturan lokal yang telah mendarah daging dalam kebidupan masyarakat, artinya undang-undang tata ruang telah melemahkan fungsi kontrol masyarakat terbadap pemanfaatan sumber daya.
Infrared Aerial Photograph Application for Prediction of Runoff Coefficient at Wuryantoro Catchment, Wonogiri Santoso, Sugiharto Budi
Forum Geografi Vol 16, No 2 (2002)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v16i2.605

Abstract

This research was carried out in Wuryantoro Watershed, Wonogiri. The goal of this study is to examine the remote sensing technology capability to obtain the physical characteristics data of watershed in the prediction of runoff coefficient using cook method. The physical characteristics is topography (relief), landcover, water storage, and infiltration. The physical characteristis is interpreted on infrared aerial photography on scale 1 : 10.000 based on element of interpretation i.e. tone, texture, size, shape, pattern, site, and association. The result of the prediction is tested by comparing them with the data of field measurement result. The accuraccy of the result of aerial photo interpretation of physical characteristics of watershed can be obtained as follows 1) the accuracy of the interpretation of landuse 88,5%; 2) the accuracy of slope interpretation 87.67%. The accuracy of prediction of the runoff coeficient 86.9%.
Spatial Analysis of the River Line and Land Cover Changes in the Kampar River Estuary: The Influence of the Bono Tidal Bore Phenomenon Putra, Aprizon; Wisha, Ulung Jantama; Kusumah, Gunardi
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.v31i2.5290

Abstract

The Kampar River estuary is well known for a tidal-bore phenomenon called ‘Bono waves’. The emergence of Bono waves has a significant influence on the estuary system of Kampar River. Scoured materials, resulting from the hydraulic jump of the tidal bore, are carried into the middle of the river. These materials are then deposited when the velocity of the river decreases as a result of the collision of the tidal current from the sea and the river flow. The aim of this was to determine the area of erosion and sedimentation with respect to the river line and perform land-cover change analysis for the area around the Kampar River estuary for the years of 1990, 2007, 2010 and 2016. The method employed was the supervised maximum likelihood (SML) classifications, which uses an overlay technique to yield alternate information on the river line and land-cover changes in the form of time-series data. The largest erosion occurred during 1990–2007, for which the average change reached 2.36 ha/year. The smallest erosion occurred during 2010–2016, when the change reached 0.41 ha/year. The largest land-cover change was found during 1990–2016, which occurred in the land for agriculture/plantations (11.57 ha/year), building/settlement (48.11 ha/year) and scrubland (30.88 ha/year). The other types of land cover, such as bare land and sediment deposition, varied every single year. The changes to the river line are caused by land-cover changes, and the Bono waves that lead to erosion and sedimentation that is not stable in the middle of the river and downstream.
Utilization of Geographic Information Systems for 1999 Election Results Mapping in Yogyakarta Special Province Saraswati, Endang
Forum Geografi Vol 13, No 2 (1999)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v13i2.459

Abstract

Up to present data and information relating to result of general eletion, 1999 still in tabuler for especially in form of figures. Data presentation in form of tables has disadvantage such as not attractive as well as not so effective for communication. Data presentation which is able to adapt the demand is presented in form in map. The aims of this research are 1) to depict data of general election result, in 1999 in form on digital map; 2) to identify factors which influence the result of vote, using map analysis technique of resulted map. The methodology of the research is to use secondary data, mean while the methods for its mapping to apply point symbol, line, and area which appropriated with data characteristics and expected visual perception of the data. The data then is elaborated with aid of Geographic Information System (GIS), to produce map of vote result in general election 1999. To identify what factors that influence voice between map of vote result and map  of population amount, according to education, occupation, and religion.The result of the research show that Partai Demokrasi Indonesia Perjuangan got highest voices, that is 33,73% followed by Partai Amanat Nasional 15,87%, Partai Golongan Karya 13,78%, Partai Kebangkitan Bangsa 13,43%, Partai Persatuan Pembangunan 4,95% and the rest 18,20% for 43 other parties. The voice gathering to occupation and their religion. The voice which are gathered by Partai Demokrasi Indonesia Perjuangan ome from middle to lower group of society which are nasionalist interest, either live in urban area or in rural area. Participant of Partai Amanat Nasional come from modern moslem group and member of Muhammadiyah, result in the voice of Partai Amanat Nasional is high in urban area. The voice which is gathered by Golongan Karya for urban area come from group of birocrate consists of official/ military/ pension, meanwhile form rural area come farmers who enjoy product result of new era regime, especially in agriculture sector. Partai Kebangkitan Bangsa gathered the voicein rural area with Nadhatul Ulama infrastructure and traditional organization which is solid strong under leading of Kyai.
Total Suspended Load and Sediment Yield of Kayan River, Bulungan District, East Kalimantan Dibyosaputro, Suprapto
Forum Geografi Vol 19, No 2 (2005): December 2005
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v19i2.4842

Abstract

This research was carried out the the drainage system of Kayan river, Bulungan District, East Kalimantan. The purpose of the research were to study the physical conditions of the Kayan catchment area, calculate the suspended sediment load, and to define the total sediment yield of Kayan River. Observation method were used in this research both of direct field observation as well as laboratory observation. Data acquired in this study were include of climatic data, geology, geomorphology, soil and land cover data. Besides also rain-fall data, temperature, river discharge and suspended sediment load. The total sediment yield were calculated by mean of mathematical and statistical analysis especially of linier regression analysis. The result of the research show that total the sediment yield of Kayan River with drainage area of 6,329.452 km² is about 236,921.25 m³/km²/year. The interesting result of the statistical analysis was that the existing negative correlation between river discharge and suspended sediment load. It is the effect of the location of discharge and suspended measurement. This condition caused by sea tide effect on river discharge at the apex delta. During high tide water river trend rising up on discharge but not on suspended sediment load. Instead, also existing setting down processes takes places of the suspended sediment load into the river bottom upper stream and the apex.
Contamination Vulnerability Analysis of Watershed for Water Quality Monitoring Widyastuti, Widyastuti; Suprayogi, Slamet
Forum Geografi Vol 20, No 1 (2006): July 2006
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v20i1.1803

Abstract

This research is an early step to determine the location of rain gauge station for artificial neural network modeling. The implementation of this model is very useful for water quality monitoring. The objectives of this study are: 1) to study the distribution of watershed parameter, that are average annual precipitation, land use and land-surface slope, 2) to conduct vulnerability analysis of watershed contamination, 3) to determine the location of rain gauge station. The study was performed by weighing and rating method of watershed parameters. The vulnerability degree of watershedtocontaminationispresentedasvulnerabilityindex.Thisindexisdeterminedbyoverallsumofallmultiplication between score and weigh number of each parameter. All data manipulation and data analysis were performed by using Geographic Information System (ArcView version by 3.2). The vulnerability of watershed contamination map had been generated using overlay operation of parameters. The results show that vulnerability index are varies between 10 up to 40 intervals. Hence, the indexes were categorized into three levels of watershed vulnerability, namely low (10 – 20), moderate (20 – 30) and high (30 – 40). It is found that the study area covered more by high vulnerability of watershed to contamination. The zoning of watershed vulnerability meant to determine the rain gauge location. There are three rain gauge stations on the area that they are in a high vulnerability level, whereas the other vulnerability level area has one rain gauge station. Each level of vulnerability area is able to represent the source of contaminant that it maybe influence the water quality of Gajahwong river.
Geological Identification of Seismic Source at Opak Fault Based on Stratigraphic Sections of the Southern Mountains Pandita, Hita; Sukartono, Sukartono; Isjudarto, Agustinus
Forum Geografi Vol 30, No 1 (2016): July 2016
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v30i1.1508

Abstract

Earthquake is one of the unpredicted natural disasters on our earth. Despite of the absence of high-accuracy method to precisely predict the occurrence of earthquake, numerous studies have been carried out by seismologists to find it. One of the efforts to address the vulnerability of a region to earthquakes is by recognizing the type of rock as the source of the earthquake. Opak Fault is an active fault which was thought to be the source of earthquakes in Yogyakarta and adjacent areas. This study aimed to determine the seismic source types of rocks in Yogyakarta and adjacent areas. The methods were by measuring stratigraphic sections and the layer thickness in the western part of Southern Mountains. Field study was done in 6 (six) research sites. Results of stratigraphic measurement indicated the sedimentary rocks in the Southern Mountains was 3.823 km in thick, while the bedrock was more than 1.042 km in thick. Based on the result, the rock types as the seismic source were thought to originate from the continental crust rocks formed of granite and metamorphic complex.
Specific Peak Discharge of Two Catchments Covered by Teak Forest with Different Area Percentages Basuki, Tyas Mutiara; Adi, Rahardyan Nugroho; Wijaya, Wahyu Wisnu
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.
Mengkaji Rational Comprehensive Planning Theory dalam Konteks Indonesia Musiyam, Muhammad
Forum Geografi Vol 10, No 1 (1996)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v10i1.514

Abstract

Akhir-akhir ini, setidaknya sejak lima tahun terakhir banyak kalangan yang menyangsikan relevansi dan keandalan teori dan praktik perencanaan kota konvensional (Rational Comprehensif Planning/ Prosedural Planning) yang selama ini dianut. Diperkirakan tidak lebih dari 30 persen dari materi yang tertuang dalam rencanaa-rencana kota di Indonesia yang dapat diimplementasikan. Tulisan ini dimaksudkan untuk mengkaji teori dan praktik Rational Comprehensif Planning dalam konteks Indonesia. Rational Comprehensif Planning (RCP) merupakan model perencanaan yang sangat dipengaruhi oleh Classical Scientific Method yang dilandasi oleh pendangan postivisme dan Cartesian – Newtonian. RCP ditegakkan atas asas rasionalitas. Dalam lingkup perencanaan identik dengan menggunakan pendekatan keilmuan (scientific approach) di dalam proses penganalisaan dan cara pemecahan masalah. Dengan demikian, rasionalitas menuntut dasar pertimbangan yang sistematik dan evaluasi yang tepat terhadap berbagai alternatif cara untuk mencapai tujuan. Untuk dapat menerapkan rasionalitas dalam proses perencanaan maka di samping diperlukan perencanaan yang ‘serba tahu’ dan mampu mensintesiskan semua persoalan yang muncul, juga dibutuhkan informasi yang lengkap dan menyeluruh dalam cakupan perencanaan. Di Barat RCP sudah mengalami fase krisis, di Indonesia model perencanaan ini sedang mengalami masa puncak dengan RUTRK-nya. Di sini terlihat bahwa kita tertinggal cukup jauh dalam hal perkembangan pemikiran tentang perencanaan. Sejak lima tahun terakhir muncul berkembang beberapa paradigma lain yang lebih berorientasi pada kkomitmen kerakyatan, sebagai akibat ketidakpuasannya terhadap RCP yang dianggap kurang berhasil menyelesaikan konflik tata ruang di kota yang cenderung intensitasnya semakin meningkat.

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