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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
 77   78   79   80   81 
The Landslide Distribution in Loano Sub-District, Purworejo District, Central Java Province, Indonesia Junun Sartohadi
Forum Geografi Vol 22, No 2 (2008): December 2008
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v22i2.4987

Abstract

This research was proposed to figure out the importance of human influence on landslide disaster. The research objectives were: (1) to map the locations of landslide during the period of January 2004-March 2008 of the study area; (2) to map the degree of landslide hazard of the study area; (3) to analyze the distribution of landslide based on the landslide hazard map; and (4) to analyze the distribution of landslide based on the road network. The method of this research consists of field survey and laboratory works. The field survey was intended to map the location of landslide which happened during the period of January 2004 up to March 2008. The land characteristics and land qualities data have been collected based on geomorphological approach. The laboratory works were proposed to analyze the field data of land characteristics and land qualities for landslide hazards classification and mapping purposes. Scoring method was applied for landslide hazard evaluation. Some geographical information techniques were applied for mapping purposes and spatial data analysis of landslide distribution. Map overlay and buffering techniques were applied during landslide distribution analysis. The results of the research showed that: (1) there were 291 landslides collected during the research period; (2) the study area consists of very high, high, moderate, and low of landslide hazard classes. There was no safe area of landslide hazard within the study area; (3) most the landslide occasions were more influenced by human activities than derived by physical conditions. Some of human activities that induced landslide in the study area were slope cutting for: road construction, houses, agricultural purposes, and sand and stone mining in the river canal; (4) the spatial distribution of most landslide ( 90%) were parallel with road networks.
Geomorphic Hazard Map for Spatial Planning Purposes T Taryono
Forum Geografi Vol 10, No 2 (1996)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v10i2.506

Abstract

In the planning of spatial lay-out oriented to environmental concept, it requires the information input conneting with the condition of local environment. This condition constitutes the features characteristic of the living space which consist of natural and social environment. One of the natural environment elements, neede to the spatial lay-out planning, is the dynamis geomorphology. The process of the dynami is some times accelerated and increased by natural and anthropogenic factors. The abnormality in both acceleration and the increase will cause a natural disaster, which is based on the landscape approach it is called the geomorphologic hazard. In connection with such event thematic map of geomorphologic hazard describes the disaster susceptibility of an area. The geomorphologic hazard map is an output map whose information is obtainable from thematic map conneting with population, land use, topography, geomorphology, rainfall, hydrological data, and slope classification. Both land use and population maps desccribes the anthropogenic factors. The role of the geomorphologic hazard map, in the planning of spatial lay-out and environmental management, i.e. preventive, represive, rehabilitative, and serves as the basis for interpretation and management of living spere. By putting geomorphologic hazard into map compilation of spatial lay-out (cultural and non cultural area map) a footstep advance is the reached to guarantee human security and their treasures, and human well-being as an integral part of human living prosperity.
Climate Change Vulnerability Analysis of Baluran National Park Beny Harjadi
Forum Geografi Vol 30, No 2 (2016): December 2016
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v30i2.1000

Abstract

Every 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.
The impact of Land use Change on Water Pollution Index of Kali Madiun Sub-watershed Pranatasari Dyah Susanti; Arina Miardini
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.v31i1.2686

Abstract

Land use change is one of the effects of population growth and increased human activities. Land use change that overlooked the rule of ecosystem sustainability has a propensity to adversely affect the environment, including the decline of water quality. Kali Madiun is a sub-watershed of Bengawan Solo Watershed that allegedly endured the impacts of land use change. This study aimed to investigate the impacts of land use change on the water quality index of Kali Madiun Sub-watershed. Land use change analysis was done by overlay analysis of spatial data including the maps of land use in 2010 and 2015. Samples were the surface water in the upper, middle and lower part of Kali Madiun Sub-Watershed. Water quality analysis was carried out by comparing the results of water quality parameter assessment based on Government Regulation No. 82 of 2001, while water quality index was figured out by an assessment based on the Decree of the Minister of Environment No. 115 of 2003. The results indicated that during the five years observation, there were land use changes in the upper, middle and lower part of Kali Madiun Sub-watershed. Several parameters increased in 2010 to 2015, namely: TDS, BOD, COD, nitrate, detergents, oils and greases. Pollution index shifted from slightly polluted in 2010 into moderately polluted in 2015. We propose a strategy to solve these problems by the involvement of stakeholders and the participation of local community in managing both domestic and industrial wastes. Also, it should be supported by palpable regulations related to land conversion. Furthermore, it is expected that the effort will reduce the potential of pollution and improve the water quality.
Kajian Parameter Kimia Posfat di Perairan Danau Sentani Berwawasan Lingkungan Auldry F. Walukow
Forum Geografi Vol 24, No 2 (2010): December 2010
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v24i2.5025

Abstract

The Sentani Lake is located in Jayapura regency which at covered east Sentani, Sentani, and West Sentani districts. The Sentani Lake has problems. The first problem is high of erosion number 94.52 ton/ha/year that the value higher than value of erosi on tolerance number 25 ton/ha/year. Second problem is chemical pollution indicated by high concentration Cu (0,0201-0,1081 mg/L) and Zn (0,21-0,36 mg/L) Those concentration are exceeds water quality standard that approve by government in PP 82 Tahun 2001 about management water quality and water pollution control. There for is needed research and management for sustainable of Sentani Lake. The aims of this research are 1) to analyze about the pollution load Sentani Lake, and 2) to analyze the assimilation capacity Sentani Lake aquaculture. The research method are survey and experiment. Results from a research showed that the load of pollution from river is obtained as follow (each in ton/month) is Pospat (ranges between 0.57 to 4.74). The assimilation capacity from lake is obtained as follow (in ton.month) is Pospat (1.40). The load of pollution are upper of the assimilation capacity.
The Role of Sand and Stone Mining to Increase Family Income in Progo Catchment Su Ritohardoyo
Forum Geografi Vol 17, No 1 (2003)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v17i1.588

Abstract

The conzequence low income of the farmer household in agricultural sector is the increase in their activities as miner of sand and stone. It means for increasing of their household income. However, how important mining role on the increasing of household income has to be studied in deeply. The factual problem is the base for research aims, with the spesific stress on studying socio-economic characteristic of sand and stone miner, and the contribution of the mining income to household income. This research was carried out in Progo catchment area, Yogyakarta Special Region. Survey method was employed by data collecting from respondents. The respondents are head of households (HH) working as sand and stone miner. Sampling technique was proportionally simple random sampling in which 120 HH was taken as respondents sample. They were representatives of upper part, middle part, and lower part of Progo catchments area. Data on socio-economic structure of the household and household income were collected by mean of structured interview. Data analysis was performed through descriptive technique in which frequencies and cross tabulation varians statistic, and multiple regression analysis were mostly used. The research shows that there are relatively similarities on socio-economic characteristic of sand and stone miners, between at lower part, middle part with upper part of Progo catchments area. This existing of sand and stone mining employs about 70% labours are local miners and 30% labours came from out of the area. Landless farmers who land own less than 500 m2 characterize them. The most of them are male, withlow formal education, and as small family (4 people evey HH). Some of them have been as sand and stone miners for more than 4 years. Generally, they work less than 8 hours for mining every day. This research is also finding that the income of the sand and stone miners are seasonal. The averages of mining income on dry season (Rp 571,880 per month) are higher than on wet season (Rp 365,620 per month). The most important factor affecting income in this activity is the working hours spent. In average, the miner’s monthly income is Rp 468,760 is much higher than minimum level of basic need in Yogyakarta Special Region (Rp 328,750 per month). It means that sand and stone miner as a second occupation besides as a farmer increases household income be capable to satisfy the need of household economy. In general, it can be concluded that the activity has an important role on the increasing of household income.
Housing Development and Land Conversion at the Surrounding Area of Yogyakarta City Su Ritohardoyo
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.v15i1.4666

Abstract

The acceleration urbanization has resulted in the growing number of housing in the rural area of surrounding city. As a consequence the size of converted agriculture land is also getting larger. However, the distribution of housing development and the impact on agriculture land have not yet been explored thoroughly through research. Therefore, this research aims at exposing rural-urbanization around city, housing development, and the conversion degree of agriculture land for housing. This research was carried out in the rural area around Yogyakarta city. It encompassed administrative divisions of Sleman and Bantul Districts. The research method is based on secondary data analysis. Several data are among other on population growth and housing distribution of 269 locations within the two districts. Data analysis employs of frequency and cross tabulation, statistics of regression and t test. Result of the research shows that rural-urbanization in around Yogyakarta has been so high. The proportion of rural-urbanized area has increased from 8.7 percents in 1980 to 43.5 percents in 1990, and 66.5 percents in the year of 2000. Similarly, the proportion of rural-urbanized population has increased from 13.2 percents in 1980 to 54.7 percents in 1990, and within 10 years (2000) it becomes 75.3 percents. Housing development of the rural area at the surrounding city was started with only 7 housing locations consisted of 59 units of building in 1973 to be 269 housing locations with 35.356 units of building in 2000. The rate of increase of the building 1.349 units per anum. The spatial and temporal characteristics of housing development of rural and urban area are different. In northern part of Yogyakarta, housing development has been growing since 1973 with the rate of growth 601 units per anum. In southern side of Yogyakarta, housing development in the rural area of Yogyakarta has been growing since 1980 with the rate of growth of 967 units per anum. Analysis result shows that number of construction in all housing site will reach 72.775 units in the year of 2025, out of wich 22.878 units will be in Bantul and 49.897 units in Sleman. The impact of the housing development is the conversion of mostly agriculture land, i.e. paddy field (67%), and only a small percentage are dry land and homestead. Within the last 27 years there has been 1,232.93 hectares of land conversion i.e. 1,068.45 hectares in Sleman and 164.47 hectares in Bantul. The rate of conversion in Sleman is 41.09 hectares per anum, whereas in Bantul it is 9.67 hectares per anum. It is predicted that land conversion in around Yogyakarta City in 2025 will be doubled to be 2.464 hectares. The distribution of this conversion will be dominant in Sleman, i.e. 2.123 hectares as compared to 341 hectares in Bantul.
The Effectiveness of Canopy Trees to Reduce Rainfall Acidity in the Industrial Area at Medan Tyas Mutiara Basuki
Forum Geografi Vol 14, No 2 (2000)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v14i2.442

Abstract

The term of acid rain is referred to the mean rainfall with a pH less than 5,65. The element of Sox and Nox are the major sources of aid rain. These two elements are oxidized into SO4 and NO3 respectively in the air. Sulfate and Nitrate are water soluble and the primary sources of hydrogen ions in acid precipitation. Rain passing through a tree canopy may lose or gain mineral elements trough some combination of natural process of absorption and leaching. By this process, the canopy may reduce rainfall acidity and negatif effects of the acid rain which will enter into the soil. Due to characteristic differences among tree canopies, a study to evaluate effectiveness of the trees in reducing rainfall acidity was done. In this study, rainfall and troughfall were collected every single rain and the pH measure by portable pH-meter. Based on data collection during 3 months in Medan Industrial Estate, it found that the mean pH of rainfall was 5,15. The highest pH of throughfall was found from Gnetum gnemon, that was 5,70; following by Mimusops elengi, Filicium decipiens, Acacia mangium, and the lowest was Nephelium lappacum. G. Gnemon was able to reduce 11% of rainfall acidity, but N. Lappacum caused 13% increasing rainfall acidity. In this study, the main source of rainfall acidity was hidrogen from sulfate acid (54%), following by chloride acid (30%), and nitrate acid (16%).
Rainfall Variability and Landuse Conversion Impacts to Sensitivity of Citarum River Flow Dyah Marganingrum; Arwin Sabar; Dwina Roosmini; P Pradono
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.
Identification and Spatial Pattern of Kao Bay Bathymetry Based on UNCLOS Yulius Yulius; H L Salim
Forum Geografi Vol 29, No 1 (2015): July 2015
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v29i1.788

Abstract

Kao Bay is located in the province of North Maluku between Regency of North Halmahera and West Halmahera. The study aims are to identify bay criteria according to UNCLOS and bathymetry based on Nautical Chart. The methods used in this study are the identification of the bay area under UNCLOS and spatial analysis using GIS software. The result shows that Kao Bay has a coast line length of 127.7 km, a mouth bay cover line of 11.1 km, total surface area of  964.38  km2, and total surface semi-circular bay cover area of 48.4 km2. The total surface area larger than the area of the semicircle bay cover area. It has been full compliance with the criteria required by UNCLOS. Spatial analysis, found that for the depth of water in Kao Bay can be divided into six classes, these are: (1) 0 – 100 meter with area of 964,38 km2, (2) 100 - 200 meter with area of 667.25 km2, (3) 200 - 300 meter with area of 556.95 km2, (4) 300 - 400 meter with area of 376.89 km2, (5) 400 - 500 meter with area of 202.44 km2, (6) 500 - 600 meter with area of 2.22 km2.

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