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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 9 Documents
Search results for , issue " Vol 27, No 1 (2013): July 2013" : 9 Documents clear
Rainfall Variability and Landuse Conversion Impacts to Sensitivity of Citarum River Flow Marganingrum, Dyah; Sabar, Arwin; Roosmini, Dwina; Pradono, P
Forum Geografi Vol 27, No 1 (2013): July 2013
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v27i1.5074

Abstract

The objective of this study is to determine the sensitivity of Citarum river flow to climate change and land conversion. It will provide the flow information that required in the water resources sustainability. Saguling reservoir is one of the strategic reservoirs, which 75% water is coming from the inflow of Upper Citarum measured at Nanjung station. Climate variability was identified as rainfall variability. Sensitivity was calculated as the elasticity value of discharge using three-variate model of statistical approach. The landuse conversion was calculated used GIS at 1994 and 2004. The results showed that elasticity at the Nanjung station and Saguling station decreased from 1.59 and 1.02 to 0.68 and 0.62 respectively. The decreasing occurred in the before the dam was built period (1950-1980) to the after reservoirs operated period (1986-2008). This value indicates that: 1) Citarum river flow is more sensitive to rainfall variability that recorded at Nanjung station than Saguling station, 2) rainfall character is more difficult to predict. The landuse analysis shows that forest area decrease to ± 27% and built up area increased to ± 26%. Those implied a minimum rainfall reduction to± 8% and minimum flow to ± 46%. Those were caused by land conversion and describing that the vegetation have function to maintain the base flow for sustainable water resource infrastructure.
Study of Transportation Movement Generation in Bandung City by using QuickBird Imagery Remote Sensing and Geographic Information System Somantri, Lili
Forum Geografi Vol 27, No 1 (2013): July 2013
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v27i1.5083

Abstract

The objective of this study is to examine the transport movement generation in Bandung City by using QuickBird imagery remote sensing and Geographic Information Systems. The method used in this research is spatial approach by quantitative descriptive analysis. It resulted that the greatest movement generation come from the regular housing types of 3440 people per hour. The District with the greatest generation was Sub Ujungberung, i.e. 55,501 people per hour, whereas the highway with the greatest amount of generation is Soekarno-Hatta Street of 51,014 people per hour.
Modeling of Percentage of Canopy in Merawu Catchment Derived From Various Vegetation Indices of Remotely Sensed Data Sulistyo, Bambang; Gunawan, Totok; Hartono, H; Danoedoro, Projo
Forum Geografi Vol 27, No 1 (2013): July 2013
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v27i1.5075

Abstract

The research was aimed at studying Percentage of Canopy mapping derived from various vegetation indices of remotely-sensed data int Merawu Catchment. Methodology applied was by analyzing remote sensing data of Landsat 7 ETM+ image to obtain various vegetation indices for correlation analysis with Percentage of Canopy measured directly on the field (PTactual) at 48 locations. These research used 11 (eleven) vegetation indices of remotely-sensed data, namely ARVI, MSAVI, TVI, VIF, NDVI, TSAVI, SAVI, EVI, RVI, DVI and PVI. The analysis resulted models (PTmodel) for Percentage of Canopy mapping. The vegetation indices selected are those having high coefficient of correlation (>=0.80) to PTactual. Percentage of Canopy maps were validated using 39 locations on the field to know their accuracies. Percentage of Canopy map (PTmodel) is said to be accurate when its coefficient of correlation value to PTactual is high (>=0.80). The research result in Merawu Catchment showed that from 11 vegetation indices under studied, there were 6 vegetation indices resulted high accuracy of Percentage of Canopy maps (as shown in the value of coefficient of correlation as >=0.80), i.e. TVI, VIF, NDVI, TSAVI, RVI dan SAVI, while the rest, namely ARVI, PVI, DVI, EVI and MSAVI, have r values of < 0.80.
Adaptive Capacity Mapping of Semarang Offshore Territory by the Increasing of Water Level and Climate Change Suhelm, Ifan Ridlo
Forum Geografi Vol 27, No 1 (2013): July 2013
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v27i1.5084

Abstract

Tidal inundation, flood and land subsidence are the problems faced by Semarang city related to climate change. Intergovernmental Panel on Climate Change (IPCC) predicted the increase of sea level rise 18-59 cm during 1990-2100 while the temperature increase 0,6°C to 4°C during the same period. The Semarang coastal city was highly vulnerable to sea level rise and it increased with two factors, topography and land subsidence. The purpose of this study was to map the adaptive capacity of coastal areas in the face of the threat of disasters caused by climate change. The parameters used are Network Number, Employee based educational background, Source Main Livelihoods, Health Facilities, and Infrastructure Road. Adaptive capacity of regions classified into 3 (three) classes, namely low, medium and high. The results of the study showed that most of the coastal area of Semarang have adaptive capacities ranging from low to moderate, while the village with low capacity totaling 58 villages (58.62%) of the total coastal district in the city of Semarang.
The Flooding Effect from Rice Cultivation Technique on Infiltration and Water Balance Supriatin, Lilik Slamet; Basukriadi, Adi; Thayeb, M. Hasroel; Soesilo, Tri Edi Budi
Forum Geografi Vol 27, No 1 (2013): July 2013
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v27i1.5080

Abstract

Flood events are often inundated rice fields and can cause flooding to surrounding areas (the lower reaches of the river) should not be underestimated (just blame the rainfall factor alone), but should be seen also internal factors of the techniques of rice cultivation in paddy fields. The purpose of research/study was to analyze the effect of flooding on the cultivation of paddy rice to infiltration and provide alternative solutions cultivation techniques to reduce flooding. The research method in this study is a survey method with the quantitative approach. Techniques flooding in paddy rice cultivation, especially irrigated cropping pattern rice 3 times a year have resulted in the formation of plow layer tread that is waterproof (hardpan). Waterproof coating that forms on the floor of paddy (rice surface) cannot infiltrate rainwater so that if there is a high-intensity rainfall in the rainy season, rice cannot hold the rain water will overflow and cause flooding to the area around the rice fields. Techniques inundation in lowland rice cultivation resulted in flooded paddy rice growth period in a rather long time (over 2 months), so that the aggregate soil is loose and prone to erosion and landslide potential. Anticipation of floods caused by wetland can be done by making the high rice fields higher than the height of the floodwaters that ever happened to the rice field and lowering the height of standing water in the paddy fields.
Effect of the Meteorological Conditions to Spring Water Availability in Some Karst Region at Gunungkidul Districts (Meteorologist Water Balance Analysis Study for Drought Mitigation) Darmanto, Darmakusuma; Cahyadi, Ahmad
Forum Geografi Vol 27, No 1 (2013): July 2013
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v27i1.5085

Abstract

The objective of this study is to understand the influence of meteorological conditions of logva water availability in karst area, Gunungkidul Regency. Meteorological condition analysis was determined by creating meteorological water balance using Thornthwaite Mather method. Water availability condition was determined by using multi-temporal images. Then, the result of water balance was matched with the logva water availability derived from multi-temporal images. The result shows that meteorological conditions will influence logva water availability in karst area, Gunungkidul Regency. It was shown by comparing the amount of logva in surplus months and deficit months. The amount of logva in surplus months is more than in deficit months. In addition, the longer meteorological water deficit, the amounts of detected logva decreases. Based on that condition, it means that meteorological water balance analysis can be used to plan disaster mitigation based on the time and duration of deficit months.
Landslide Risk on the Farmland at the Arjuno Volcano Complex of East Java Purnomo, Nugroho Hari; Sutikno, S; Sunarto, S
Forum Geografi Vol 27, No 1 (2013): July 2013
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v27i1.5081

Abstract

The purposes of the study are (1) studying the characteristics of the landslide hazard level, vulnerability, and capacity dealing with the seasonal plant farmland, and (2) developing the conceptual model disaster risk of landslide for the seasonal plant farmland at the stato volcano area. Sampling of the land factor was carried out in a purposive way and the sampling of the people was carried out accidentally. The analysis was conducted descriptively, parametric and non-parametric statistics, and spatial analysis of ecological map, land shape, slope, soil and land use. The findings showed that the extremely high landslide risk occurred at the cone shape of the incised volcano and the slope of the incised volcano. The economic vulnerability of one-seasonal crop farmland was about Rp. 8,879,310 ha/year-Rp. 44,036,061 ha/year. While, the socio-economic factor of the farmers was generally characterized by a transition into a periurban area. The conceptual model tated that the resources of seasonal plant farmland with the high risk of landslide can be cultivated with the acceptable risk if the vulnerability of agricultural commodity is low in economic value and the capacity of farmers cultivating it is high.
Assessment of Mangrove Ecosystem Degradation to the Population of Polymesoda erosa in Segara Anakan, Cilacap Listyaningsih, Dyah Dwi; Yulianda, Fredinan; Ardli, Erwin Riyanto
Forum Geografi Vol 27, No 1 (2013): July 2013
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v27i1.5073

Abstract

Segara Anakan is a unique ecosystem with lagoons, mangrove and lowland. One of biota living in mangrove ecosystem is Polymesoda erosa. The species is valuable both economically and ecologically. This study aims to determine population of P. erosa and to analyze its relationship with mangrove degradation in Segara Anakan, Cilacap. Purposive Random Sampling was used to collect the clams data and plots sampling techniques were applied to obtain vegetation data. The result shows that there are very weak correlations between P. erosa and mangrove. Based on GIS analysis, mangrove area in Segara Anakan was 8036.9 ha. P. erosa str ongly cor r elates to envir onmental components namely water content of soil, temperature and light intensity. People utilized P. erosa as source of food, income and land hoard.
Modelling of Community Recovery Level of Flood-Prone Area in Surakarta Noviani, Rita; Wijayanti, Pipit; Yusup, Yasin
Forum Geografi Vol 27, No 1 (2013): July 2013
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v27i1.5082

Abstract

This study aimed to develop community resilience velocity model after the disaster. The study is a descriptive analysis using household survey of the flood victims. Total sample of 100 households in ten villages on the banks of the Bengawan Solo River, and is an area prone to flooding. Processing for data is using descriptive statistical analysis, correlation and regression, analysis of variance and factor analysis. There is a close relationship between the power recovered by a factor of assets, knowledge and long flood events. The two main factors affecting the dominant public resilience is a characteristic of a society of social assets, knowledge and natural assets. The second factor is the economic and financial factors, and long floods. The Resulted model level resilience from the research is Y = 0.012 X1 + 0.118 X2 + 0.394 X3 + 0.079 X4 + 0.040 X5-.002 X6. which; Y is Power Restored (speed), Ownership Financial Assets (X1), Ownership of Assets Economics (X2 ), Natural Asset Ownership (X3), Social Asset Ownership (X4), Lama flooding (days) (X5), and Knowledge (X6). Further optimization of the acceleration of flood resilience of households to do with strengthening the ownership of assets, improving the capacity of communities and reduce the threat of flooding and duration of.

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