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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
 109   110   111   112   113 
Utilization of Remote Sensing Techniques for Monitoring and Evaluation of Solo Watershed Management Totok Gunawan
Forum Geografi Vol 17, No 2 (2003)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v17i2.532

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).
Geomorphologycal Study for Flood and Mass Movement Occurrence at Parang Sub Village, Paranggupito District, Wonogiri Regency Muhammad Amin Sunarhadi
Forum Geografi Vol 15, No 1 (2001): July 2001
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v15i1.4656

Abstract

The aim of this study are knowing factors that impacts to flood and mass movement hazard at karst region. Area of this study are covering Parang Sub Village, Ngasem, Paranggupito District, Wonogiri Regency. To achieve this objective, geomorphic approaches (static, as well as dynamic environmental geomorphology) were analyzed, using survey and secondary data collection. Results from this study are describe that Parang is a karst depression and had water accumulated from Parang boundaries area as upper landform. Mass movement at study area is caused by saturation of soil by water after rainfall. Supported by steep slope impact sliding mass movement. Based on the priority, to change the water running direction and will not concentrate to Parang Depresion, there are need the water-massbank stability. This bank will prevent the soil mass to stable.
Island Identification at River Estuary Based on Toponymy (Case Study: River Estuary of Bulungan, BulunganRegency, North Kalimantan Province) Yulius Yulius; Ifan Ridho Suhelmi; M Ramdhan
Forum Geografi Vol 28, No 1 (2014): July 2014
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v28i1.436

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.
Analisis dan Estimasi Dampak Longsorlahan terhadap Jaringan Jalan di Kecamatan Samigaluh, Kabupaten Kulonprogo Eko Setya Nugroho; Danang Sri Hadmoko; Cees van Westen; Nanette Kingma
Forum Geografi Vol 26, No 2 (2012): December 2012
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v26i2.5068

Abstract

In this study, direct risk assessment was developed for various scenarios on the basis of hazard (e.g. spatial probability, temporal probability and magnitude class), vulnerability and estimating cost of road damage. Indirect risk assessment was derived from traffic interruption. The impact of landslide both direct and indirect impact were analyzed in the road segment 174. The research results show the highest direct impact of debris slide type of magnitude I located in the 20th mapping unit. The lowest direct impact of debris slide type of magnitude I can be founded in the 18th mapping unit. The direct impact of rock fall type of magnitude I which is located in the 6th mapping unit. Meanwhile, indirect impact which was caused by road blockage is Rp. 4,593,607.20 and Rp. 4,692,794.40 by using network analysis and community perception methods respectively. After class classification, road segment 174 is dominated by very low hazard, very low vulnerability and very low direct impact.
The Dangerous of Landuse Change at Semarang City Hariyanto Hariyanto
Forum Geografi Vol 18, No 2 (2004)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v18i2.614

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.
Perkembangan Kondisi Demografi dan Sosial-Ekonomi di Kotamadya Yogyakarta Beserta Implikasinya untuk Pengembangan Fasilitas Kota R Rijanta
Forum Geografi Vol 7, No 2 (1993): December 1993
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v7i2.4804

Abstract

Tulisan ini bertujuan menunjukkan perubaban demografis di Kotamadia Yogyakarta dan sekttarnya agar supaya dapat mengidentifikasi masing-masing konsekuensinya pada perencanaan fasilitas pelayanan. Data yang digunakan dalam tulisan ini berasal dari berbagai sumber, utamanya dari sensus penduduk tabun 1980, 1990 dan dokumen-dokumen lainnya. Dinamisasi penduduk dideteksi dari berbagai macam variabel perkembangan (ukuran, kepadatan, ukuran rumah tangga, struktur, pekerjaan dan pendidikan) pada dua dekade terakhir dimana dapat memberikan gagasan kasar dari arab dimana fasilitas-fasilitas pelayanan dikembangkan. Beberapa penyesuaian pada strategi-strategi pengembangan sektoral pada dekade berikutnya perlu dipertimbangkan sebagai sesuatu yang penting agar supaya dapat mengantisipasi dampak demografis dari perubaban demografis akhir-akhir ini.
Agricultural Land Capability at Teras Sub-District, Boyolali, Central Java Sugiharto Budi Santoso; Taryono Taryono
Forum Geografi Vol 13, No 1 (1999)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v13i1.468

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.
Urban Graveyard in Spatial Change Perspective D Dilahur
Forum Geografi Vol 4, No 2 (1990): December 1990
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v4i2.4853

Abstract

The growth of urban population tends to increase constantly but some towns show faster growth than others. Ultimately the urban area extends tremendously, and a new urban environment is created. Graveyard is one phenomenon that an not be neglected from this process. Duc to their strategic locations, some portions have undergone changes in economic, social, and environment values. For the time being lands used for graveyards are constantly increasing. The competition with other uses can not be avoided anyway and land conservation must be carried out concomitantly.
Review of Overlandflow Quality in Densely Settled Sub-Urban Areas S Sudarmadji
Forum Geografi Vol 11, No 2 (1997)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v11i2.491

Abstract

The study aims to analyse quality of water from overlandflow in the sub-urban area having high of to houses, in the Sinduharjo, Sleman regency. In the sub urban area, the run off originated from paved and impermeable are which is not uniformaly distributed over the area. Run off is iniated from detention storage and overlandflow. Therefore any water pollution of the runoof begin from overlandflow which dissolves constituent within the soil and rock materials. Land cover also determines the dispersion agent of rain water thus the affect the material dissolved in the water. As an input into the catchment system, rainfall affects overlandflow, quantitative, and qualitatively. Overlandflow from open space in the sub-urban area was evaluated based on physical and chemical characteristics. Overlandflow from urban area has chemical parameters such as C, NO2, NO3, and PO4 are higher than those in overlandflow from rural area which is covered by forest and garden. Overlandflow shows BOD and COD in relatively high concentration. Overlandflow is not recomended to be discharge into infiltration wells, unless it is free from parts having high significant contamination.
Suitable Proportion Sample of Holdout Validation for Spatial Rainfall Interpolation in Surrounding the Makassar Strait Giarno Giarno; Muhammad Pramono Hadi; Slamet Suprayogi; Sigit Heru Murti
Forum Geografi Vol 33, No 2 (2019): December 2019
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v33i2.8351

Abstract

Spatial rainfall interpolation requires a number of suitable validation samples to maintain accuracy. Generally, the larger the areas which can be predicted, the better the interpolation. In addition, the data used for validation should be separated from the modelling data. Moreover, the number of samples determine optimally proportion the independent sites. The objective of this study is to determine the optimal sample ratio for holdout validation in interpolation methods; the Makassar Strait was chosen as the study location because of its daily rainfall variation. The accuracy of the sample selection is tested using correlation, root mean square error (RMSE), mean absolute error (MAE) and the indicators of contingency tables. The results show that accuracy depends on the ratio of the modelling data. Therefore, the more extensive the data used for interpolation, the better the accuracy. Otherwise, if the rain gauge data is separated according to province, there will be a variation in accuracy in the portion of independent samples. For rainfall interpolation, it is recommended to use a minimum 75% of data sites to maintain accuracy. Comparison between kriging and inverse distance weighting or IDW methods indicates that IDW is better. Moreover, rainfall characteristics affect the accuracy and portion of the independent sample.

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