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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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Introduction of Alley Cropping Parmadi, Sugeng
Forum Geografi Vol 12, No 2 (1998)
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Abstract

One of the efforts to preserve the sources of vegetarian, soil, and water is to rehabilitate the land and soil conservation. The aim of this rehabilitation is increasing and maintaining the produtivity of the land, so it can be preserved and used optimally. Therefore, it is necessary to a  develop a variety of good soil conservation, such as vegetative method and civil engineering. To find an appropriate technology, so it is necessary to develop some alternatives of soil conservation technique that are mainly implemented at dry land with its slope of more than 15% in the upstream area of discharge. One of the most suitable soil conservation technique today is Alley Cropping. Based on the research (trial and error) in some areas, Alley Cropping could really provide a positive result in terms of erotion controlling and running off and maintain the land productivity. In addition, the technique is more easly operated and spends a cheaper cost than making a bench terrace.
Utilization of Remote Sensing Techniques for Monitoring and Evaluation of Solo Watershed Management Gunawan, Totok
Forum Geografi Vol 17, No 2 (2003)
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Abstract

This research is an application of remote sensing technology for monitoring and evaluation of watershed management, which was conducted is Solo Watershed, Central and East Java. The research objectives were 1) to investigate the capability of photomorphic analysis of Landsat Thematic Mapper (TM) and Enhanced Themmatic Mapper (ETM +) imagery as the basic for analyzes of landforms, landuse, and morphometry of the land surface; 2) to calculate the overland flow – peak discharge and erosion – sediment yield as indicators of land degradation of the area; 3) to use the indicators as set of instrument for monitoring and evaluation of watershed management. In this study, visual interpretation by means of on-screen digilization of the digital imagery was carried out in order to identify and to delineate land parameters using photomorphic approach. Based on the photomorphic analysis, several image – based parameters such as relief topography, physical soil characteristic, litho – stratigraphy, and vegetation cover were integrated with other themati maps in a geographic information system (GIS) environment. Estimation of overland flow (C) based on Cook methods (1942) and calculation of peak disccharge (Qmax) based on rational method (Qmax = C. I. A) were applied. Meanwhile, estimation of surface erosion was carried out using Universal Soil Loss Equation (USLE, A = R. K. L. S. CP). The sediment yield (Sy) was estimated using seddiment delivery ratio ( SDR) based on the following formula: Sy = [A + (25% x A)] x SDR. Both pairs of C – Qmax and A – Sy, were utilized as the basis for monitoring and evaluation of the watershed. The combination of C – Qmax and A – Sy were also used as the basis for selection of stream gauge setting / AWLR within particular sub – catchment. It was found that the photomorphic analysis is only color/tone, slope aspects, pattern, and texture, unit boundaries between volcanic – origin landscape (Wilis volcanic complex) and folded – hills landforms (Kendeng ridges) can be delineated. Within the volcanic features, coarse – textured units indicating pyroclastic materials with high drainage density (western part of Lawu volcano). In terms of calculated overland flow and peak discharge of 100 sub – catchment within the Solo Watershed, it was found that there are four sub – catchment with relatively high values (> 0.60 and > 1200 m3s1 for overland flow and peak discharge repectively), namely Samin (Karanganyar), Keduang (Wonogiri), Dengkeng (Klaten), and Sungkur (Ponorogo). Five sub-catchment might be categorized as having moderate peak discharge (Qmax ranges from 1000 – 1200 m3s1), namely Ketonggo (Ngawi), Keyang (Ponorogo), Gandong – Semawur (Magetan), Pepe (Boyolali), and Soko (Bojonegoro), while the remaining 91 sub-catchments are categorized as having low peak discharge. Based on the calculation of erosion and sediment yield, there was no sub-catchment with moderate category (60 – 180 ton ha1yr1), i.e. Samin (Karanganyar), Gonggong (Magetan), Ngisip and Kedung Cilik (Tuban), and Pepe (Boyolali). The other 95 sub-catchment might be categorized as gentle to good. In terms of values representing overland flow – flood and erosion – sediment yield, there are several sub-catchments require first priority in monitoring and evaluation, and are recommended as suitable sites for stream gauge setting, i.e. Samin (Karanganyar), Gonggong (Magetan), Ngisip and Kedung Cilik (Tuban).
Island Identification at River Estuary Based on Toponymy (Case Study: River Estuary of Bulungan, BulunganRegency, North Kalimantan Province) Yulius, Yulius; Suhelmi, Ifan Ridho; Ramdhan, M
Forum Geografi Vol 28, No 1 (2014)
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Toponymy is the scientific study of geographical names. Island Toponym represents step of island identi- fication by identifying its name and geographic position. Island Identification in toponymy was conducted through desk study and field survey. Desk study was implemented to obtain earlier description of islands physical condition, social and culture of local people. Field survey to obtain names of the islands was carried out by interviewing local people and positions were measured by using a simple GPS system then validated using nautical chart Dishidros publications 1997 and Image from Google Earth in 2013. The Survey at Bulungan Regency of East Kalimantan Province, 19 islands had been identified 7 islands which have not been listed at DEPDAGRI (Ministry of Internal Affairs) in 2004 but the other 10 islands have been named, and 9 island which is not drawn yet in sea chart published by DISHIDROS TNI-AL.
The Dangerous of Landuse Change at Semarang City Hariyanto, Hariyanto
Forum Geografi Vol 18, No 2 (2004)
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Abstract

Town in veri dynamic area. Growth of populatio, both natural and  migration (urbanization), need area for the settlement and their activities. Neccesity of area for settlement can’t be avoided. As a result, there is a landuse changing from non settlement area (set field, dry field, swamp, pond) to settlement area. This change will influence the hydro system balance in Semarang, for instance the extending of flooding area, etc. This research tries to find the characteristi of landuse change in Semarang. The characteristic involving how is pattern, process, intensity, and tendency. Pattern of landuse changing is sequence of using area before it became the settlement. Process of landuse change is by using the population are able to settle. Tendency is degree of landuse change speed. This research methods secondary analysis method, that is compare the statistic data of the landuse and map in 1980 and 2000. The sampling is by purposive random sampling method. Purposive is used so that all subdistricts in sub urban are represented. The sample area is the from percil in ertain coordinate. Result of this research shows that there is landuse changing rapidly that is decrease in the width of wet field, dry field, swamp, and pond. On the other hand, there is increase in width of settlement area and other dry land with intensity 232 ha every years. Wet field decrease 131,7 ha every years, swamp and pond 31 ha, and dry field 24,2 ha every years. In actually this landuse changing pattern is out of government policy. Semarang conversed. However, wet field is water habitat that is most potential. Tendency of sttlement growth is more facus on accesibility aspect and available city’s facilities only. Number of settlement are built on land which not suitable, such labile land, or high slope. It proves that the government control function is weak. The conclusion from this research that landuse changing has to be ontrolled restrainded, so it will not cause the bad effet in Semarang. Width the wet field is 10% by width town, must be conservation. Because wet field has ecology value and economic value that is rice production and absorb labour in agricultural sector. Therefore, function role of government controll must be actived.
Agricultural Land Capability at Teras Sub-District, Boyolali, Central Java Santoso, Sugiharto Budi; Taryono, Taryono
Forum Geografi Vol 13, No 1 (1999)
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Abstract

There are three aims on this research: to determine  about the level of farming land capability and the sub class of farming land capability, to determine the area that posible to developed for farming land, to evaluate about farming land capability for landuse in the sub district of Boyolali Regency. The methods used in this research is observation in the field and laboratory with land unit approach as a standard  of mapping. The data collected from this research is degree of slope, erosion sensibility, erosion level, solum, texture, permeability, drainage, gravel/ pebble, and the flood hazard. The result of this research showed that the research area has II to VI land capability. Land capability II: 750 Ha (25,1%), III: 1308,1 Ha (43,7%), IV: 250 Ha (8,3%), V: 386,5 Ha (13%), VI: 299 Ha (10%). The dominant restriction is the soil moisture that consist of permeability and drainage.
Karakteristik Geografi Regional Indonesia: Analisis Peluang dan Tantangan terhadap Penggalian Sumber-Sumber Dasar Kawasan Indonesia Timur Baiquni, M
Forum Geografi Vol 11, No 1 (1997)
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Abstract

Pada dasarnya pengembangan kawasan andalan yang diprioritaskan di Kawasan Timur Indonesia (KTI) bertumpu pada pendekatan yang berorientasi pada sumberdaya (resources based oriented) dan pendekatan yang berorientasi pada sumberdaya manusia (people centered approach). Karakteristik geografi regional kepulauan Indonesia ditandai dengan dominasi wilayah laut dan perairan pantai. Luas wilayah laut sekitar empat kali lipat dari luas daratan, yaitu 7,9 juta km2 dibanding 1,9 juta km2. Ini berarti wilayah laut mendominasi sekitar 81% dari luas wilayah Indonesia, dengan garis pantai sepanjang 81.000 km. Kepulauan Indonesia dapat dibagi menjadi tiga kelompok. Kelompok pertama adalah Jawa, Sumatra, dan Kalimantan serta pulau-pulau kecil di sekitar dangkalan Sunda di sekitar perairan Selat Malaka dan perairan Indo – Cina yang berasosiasi dengan Asia. Kelompok kedua adalah Irian Jaya (bagian dari Pulau New Guinea) dan kepulauan Aru di dangkalan Sahul yang berasosiasi dengan Australia. Kelompok ketiga adalah kelompok kepulauan Nusa Tenggara, Maluku, dan Sulawesi dengan dikelilingi perairan dalam atau palung laut. Sumber-sumber dasar pembangunan yang dimaksud dalam penelitian ini dapat dikelompokkan menjadi tiga, yaitu sumberdaya alam, manusia, dan budaya. Pengembangan KTI perlu mendapat perhatian karena masih adanya kesenjangan pembangunan yang terjadi. Kesenjangan ini dapat dilihat dari tiga indikator dasar yaitu luas geografis, distribusi kependudukan, dan konsentrasi industri Pulau Jawa dan Madura.
Penyediaan Data Dasar dalam Pengembangan Kota Poniman, Aris
Forum Geografi Vol 9, No 1 (1995)
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Abstract

Ketersediaan data dasar dalam pengembangan kota sangat diperlukan baik dalam rangka perencanaan tata ruang tingkat nasional, propinsi, maupun kabupaten/kotamadia. Hal ini mendukung amanat dalam GBHN 1993 bahwa pembangunan perkotaan ditingkatkan dan diselenggarakan secara berencana dan terpadu dengan memperhatikan rencana umum tata ruang, pertumbuhan penduduk, lingkungan permukiman, lingkungan usaha, dan lingkungan kerja serta kegiatan ekonomi dan kegiatan sosial lainnya agar terwujud pengelolaan perkotaan yang efisien dan tercipta lingkungan yang sehat, rapi, aman, dan nyaman. Permasalahan data dasar dalam perkembangan daerah perkotaan antara lain adalah data dasar dan peta dasar yang belum seluruhnya baku, dan data dasar sumberdaya alam, sumberdaya buatan, dan sumberdaya sosial ekonomi yang sangat dinamis. Pemutakhiran data dasar dan penyusunan basis data digital secara terpadu pada tingkat nasional, propinsi, dan kabupaten/kotamadia perlu terus dikembangkan.
The Run up Tsunami Modeling in Bengkulu using the Spatial Interpolation of Kriging Technique Fauzi, Yulian; Suwarsono, Suwarsono; Mayasari, Zulfia Memi
Forum Geografi Vol 28, No 2 (2014)
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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.
Infrared Aerial Photograph Application for Prediction of Runoff Coefficient at Wuryantoro Catchment, Wonogiri Santoso, Sugiharto Budi
Forum Geografi Vol 16, No 2 (2002)
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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%.
Utilization of Geographic Information Systems for 1999 Election Results Mapping in Yogyakarta Special Province Saraswati, Endang
Forum Geografi Vol 13, No 2 (1999)
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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.

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