Forum Geografi
Not a member yet
326 research outputs found
Sort by
Pengenalan Proses Citra secara Digital
Get PDFTeknologi penginderaan jauh telab berkembang dengan pesat di Indonesia semenjak awal 1970-an. Berbagai jenis aplikasi telah diterapkan baik oleh instansi pemerintah maupun swasta. Pada awal penggunaannya teknologi interpretasi yang dominan dipergunakan oleh para pemakai adalah interpretasi secara visual. Sejalan dengan perkembangan teknologi komputer, analisa citra berkembang pula ke arah digital. Makalah ini mencoba mengenalkan teknologi interpretasi secara digital yang memungkinkan data tersebut diintegrasi dengan sistem informasi geografi yang terus berkembang di Indonesia
A Review of Society’s Behaviour Towards Land Management of Susceptible Area to Landslide in Pekuncen, Banyumas
Get PDFLand management is a manifestation of the society’s behaviour in utilizing the land. The objective of the research was to examine the effect of education level, income, land tenure, knowledge, and information input on the society’s behaviour in managing the area susceptible to landslide in Pekuncen sub-district, Banyumas district. The method of this research was survey by employing questionnaire to collect field data. The variable comprised of the data of education level, income, land tenure, knowledge, and information input.. Stratified random sampling was applied to determine the samples of the research. The area susceptibility class was considered as the strata in which each stratum consisted of 40 family heads as the respondents. The data analysis applied statistical test of multi-regression. Research area was divided into three classes of landslide susceptibility comprising of low, medium, and high class. Education level, income, land tenure, knowledge, and information input significantly influenced the society’s behaviour dealing with land management (determination co-efficiency (R²) was 69.9 %). It occurred in the area of medium susceptibility class. Information input (regression coefficient/(beta) = 0.817) was the most influential predictor of society’s behaviour in land management located in the low susceptibility class. From this research, it was expected that the description about the factors that influenced the society’s behaviour in managing the landslide-prone area would be a valuable reference in preventing landslide in those areas
Livelihood Strategies as Responses to Water Availability in Pusur Subwatershed, Bengawan Solo
Get PDFWater availability has a significant role on human life, particularly for the rural, agrarian communities. This study aimed to investigate the diverse conditions of water availability in Pusur sub-watershed, Bengawan Solo watershed, and the livelihood strategies of the local community in responding to the water availability. The study used both quantitative and qualitative methods of data analysis, and the data was collected through questionnaire, in-depth interview, and observation. On the water availability, the study used the following variables: (1) quality, (2) quantity, (3) spatial and temporal distribution, (4) access, (5) social-economy, and (5) institutional aspect. On the livelihood strategies, it uses: (1) reaction and (2) anticipation for water deficit. In term of sampling methods, the study used area and purposive sampling, by splitting the study site into the upper, middle, and lower area. The analysis of this study indicates that the level of water availability in the upper area is considered low. The community living in the upper area depends upon rainwater for its agricultural sector, and upon the water supply distributed by pipelines and tanker trucks for its household. The study also indicates that the middle area has abundant water supply, but the quality has been declined due to pollution, poor sanitation system, and potential conflict among the community members. Meanwhile, in the lower area, particularly in the dry season, irrigation water has been inadequate. Responding to the diverse water availability, the community has applied the following livelihood strategies: (1) leaving the agricultural land uncultivated in the upper area, and (2) pumping wells and rivers in the middle and lower areas. In addition, as part of its precautions actions, the community has applied: (1) agroforestry system at the upper area, (2) improved the irrigation system of the middle area, and (3) creating wells and using water pumps in the lower area.
Climate Change Vulnerability Analysis of Baluran National Park
Get PDFEvery ecosystem has a different level of susceptibility to environmental disturbances it receives, both from natural factors or anthropogenic disturbance. National Park (NP) Baluran is one national park that has a representation of a complete ecosystem that includes upland forest ecosystems, lowland forests, coastal forests, mangroves, savanna and evergreen forest. The objective of this study is to get a formula calculation of vulnerability analysis of constant and dynamic factors. Baluran NP vulnerability assessment to climate change done by looking at the dynamic and fixed factors. Vulnerability remains a vulnerability factor to the condition of the original (control), whereas vulnerability is the vulnerability of the dynamic change factors which affected the condition from the outside. Constant Vulnerability (CV) in Baluran NP dominated resistant conditions (61%), meaning that the geomorphology and other fixed factors (slope and slope direction/aspect, then the condition in Baluran NP sufficiently resilient to climate change. Dynamic Vulnerability (DV) is the vulnerability of an area or areas that change because of pressure from external factors. DV is influenced by climatic factors (WI = Wetness Index), soil (SBI = Soil Brightness Index), and vegetation (GI = Greenness Index). DV in Baluran NP from 1999 to 2010 shifted from the original category of being (84.76%) and shifted to the susceptible (59.88%). The role of remote sensing for the analysis of raster digital system, while the geographic information system to display the results of cartographic maps
Inventarisasi Data Ungkungan Fisik Daerah Rencana Kawasan Wisata Jimbaran-Kedonganan Bali
Get PDFDaerah Jimbaran dan Kedonganan adalah merupakan salah satu daerah yang direncanakan untuk kawasan pariwisata pantai Pulau Bali. Tujuan penelitian ini adalah mengadakan inventarisasi data lingkungan fisik daerah tersebut yang meliputi iklim, geomorfologi, tanah, hidrologi, dan oceanografi. Adapun metode penelitian yang digunakan adalah metode observasi yakni pengamatan, pengukuran dan pencatatan terhadap aspek-aspek tersebut baik langsung di lapangan maupun di laboratorium. Hasil penelitian menunjukan babwa wilayaj Jimbaran dan Kedonganan sebagian besar mempunyai potensi lingkungan fisik yang baik sebagai kawasan wisata pantai. Subu rata-rata adalah 27.05° C dengan subu tertinggi terjadi pada Bulan Oktober yakni 29° C dan suhu terendah pada bulan Agustus yakni 26° C. Hujan rata-rata setahun adalah 1240 mm dengan bulan-bulan basah antara Desember hingga April, sedang bulan-bulan lainnya adalah bulan kering. Secara geomorfologis daerah penelitian merupakan teluk dimana dari tempat ini dapat melihat panorama alam yang indah yakni terbenamnya matahari di waktu sore. Daerah ini juga merupakan bagian Ieher dari suatu tombolo. Sebelah selatan daerah penelitian berbatasan dengan cliff dari batu gamping yang menambah keindahan panorama alami. Kedalaman air tanah bervariasi antara 4-7.65 meter dengan tebal air tanah antara 0.65-1.00 meter. Potensi air tanah sebesar 5.913.600 mm3, dengan pH air di beberapa daerah 7 karena adanya intrusi air taut. Potensi tersebut tidak mencukupi untuk kebutuhan air untuk keperluan hotel-hotel di wilayah ini sebingga harus menambah air dari luar kawasan tersebut. Wilayah teluk Jimbaran-Kedonganan ini mempunyai tinggi gelombang antara 0.25-1.60 meter, frekuensi gelombang antara 10-15 buah gelombang per menit, lebar gisk antara 75-100 meter, dengan kemiringan gisk 5-7. Di dalam teluk Jimbaran Kedonganan ini terdapat adanya teluk dan tanjung yang kecil yang letaknya selalu berpindah-pindah. Hal ini berbahaya bagi perenang di laut karena arus balik kuat (rip cureent) ke arah laut berpindah-pindah tempat pada periode waktu tertentu
Contamination Vulnerability Analysis of Watershed for Water Quality Monitoring
No full textThis 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
Determination of Erosion Hazard Level And Bio-Mechanical Conservation In Post Merapi Eruption Land At Srumbung Magelang
Get PDFThe purpose of this study was to determine the Erosion hazard, to look for conservation of bio - mechanical techniques are appropriate . Research methods with overlies topographic maps, soil maps, land use maps, to obtain a Land Unit Map. Determined soil physical properties (texture, structure, permeability) and chemical properties of soil (soil organic matter), slope, slope length, broad of land unit, crops factor and value conservation factors that have been there for Land Unit. Each land unit is determined the amount of land erosion and erosion hazard level. Erosion hazard level is determined based on soil erosion, and soil depth. Erosion hazzard level is used to determine the bio-mechanical conservation, according Hardjowigeno and Sukmana (1995). The results showed that the highest erosion hazard level with an area of 12.947 ha is classified weight (Land unit 15A), and the classification of an area of 14.665 ha is clssified moderately (Land unit 6A). Soil conservation is done in areas with highest erosion hazard level by making individual terraces and “kerandang” planted as a cover crops
Detection of Ground Water Availability at Buhias Island, Sitaro Regency
Get PDFThe study aims to detect ground water availability at Buhias Island, Siau Timur Selatan District, Sitaro Regency. The research method used the survey method by geoelectrical instrument based on subsurface rock resistivity as a geophysical exploration results with geoelectrical method of Wenner-Schlumberger configuration. Resistivity geoelectrical method is done by injecting a flow into the earth surface, then it is measured the potential difference. This study consists of 4 tracks in which each track is made the stretch model of soil layer on subsurface of ground. Then, the exploration results were processed using software RES2DINV to look at the data of soil layer based on the value of resistivity (2D). Interpretation result of the track 1 to 4 concluded that there is a layer of ground water. State of dominant ground water contains the saline (brackish). Location of trajectory in the basin to the lowland areas is mostly mangrove swamp vegetation. That location is the junction between the results of the runoff of rainfall water that falls down from the hills with sea water. Bedrock as a constituent of rock layer formed from marine sediments that carry minerals salts
Evaluation of Satellite Image Correction Methods Caused by Differential Terrain Illumination
Get PDFThe problem due to differential terrain illumination on satellite imagery is experienced by most of areas which are on mountainous terrain. This may cause variations in reflectance of similar ground features which lead to a misclassification of land cover classes due to different topographic positions. This phenomenon most commonly occurred in the areas which are located on southern and northern hemisphere because of the low sun inclination. This problem has been a major interest for researchers to be solved prior to the land cover classification process. For satellite images which experience this kind of problem, topographic correction need to be applied in order to reduce the illumination effects prior to land cover classification process. This research is aimed at conducting topographic correction of multi spectral SPOT satellite data as well as evaluating the three topographic correction methods. They are Cosine which is based on Lambertian reflectance assumption, as well as Minnaert correction and C correction methods which are based on non-Lambertian reflectance assumption. The data used in this study are two scenes of SPOT images of forested mountainous area of Miyazaki Prefecture, Kyushu, Japan. Research steps had been conducted in this study including geometric correction, sample data collection for calculating Minnaert constants and C constants at location which represents the whole study area, topographic correction for two scenes SPOT images, and results analysis. The results show that Cosine method did not show good performance for the study area which is topographically dominated by rugged terrain. Whereas Minnaert method and C method gave satisfactory results as is indicated by the statistical data as well as visual interpretation. However the Minnaert correction method showed slightly better performance than the C correction method
Study of Climate Change Impact to Local Rainfall Distribution in Lampung Provinces
Get PDFGlobal warming which leads to climate change has potential affect to Indonesia agriculture activities and production. Analyzing rainfall pattern and distribution is important to investigate the impact of global climate change to local climate. This study using rainfall data from 1976-2010 from both lowland and upland area of Lampung Province. The results show that rainfall tends to decrease since the 1990s which related to the years with El Nino event. Monsoonal pattern- having rain and dry season- still excist in Lampung; however, since most rain fell below the average, it could not meet crops water need. Farmers conclude that dry seasons were longer and seasonal pattern has been changed. Global climate change might affect Lampung rainfall distribution through changes on sea surface temperature which could intensify the El Nino effect. Therefore, watching the El Nino phenomena and how global warming affects it, is important in predicting local climate especially the rainfall distribution in order to prevent significant loss in agriculture productivities