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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.
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Articles 14 Documents
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Search results for , issue " Vol 20, No 2 (2006): December 2006" : 14 Documents clear
The Hierarchy of Earthquake and Tsunami: The Cases of Aceh, Nias, Bantul, Pangandaran, and Sunda Staits Hardjono, Imam
Forum Geografi Vol 20, No 2 (2006): December 2006
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Indonesia is vulnerable to earthquake and tsunami disaster because it is located in the fracture zone between the continental and oceanic lithospheres, running from the west of Sumatera, though the south of Java, NTB, Sulawesi to Papua. In the theoretical framework of Indonesian tectonic lithosphere, this zone is known as Sula-spuur. The frequent earthquake and tsunamis in Indonesia justify the theory that the earth will always seeks for dynamic self-balance through oceanic basin as well as continental basement expansions. Based on the tectonic lithosphere analysis, the anatomy of earthquake and tsunami disaster in Java falls into two different paths. The first is northwestward path in Western Java following the Semangko fault trend, from Pangandaran/Cilacap through Kadipaten, Subang to Jakarta. The other is the northeastward path in Central Java and East Java running from Bantul through Prambanan, Klaten to Rembang. The two hats correspond to the seventeen-kilometre-deep-underground fracture involving basement rocks resulted from the area shifting evolution during the limestone age prior to the existence of limestone in Indonesia. Based on the evidences found in Bantul- Klaten earthquake, the question necessary to raise is whether similar earthquake may happen in Jakarta.
Providing of Spatial Wetland Information for Supporting National Development Poniman, Aris; Nurwadjedi, Nurwadjedi; Suwahyuono, Suwahyuono
Forum Geografi Vol 20, No 2 (2006): December 2006
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

The wetland has a strategic role in national development. The potential uses of the wetland are varied such as for agriculture, fisheries, industries, and forestry. The intensive use of the wetland for agricultural development in Sumatera, Kalimantan, Sulawesi, and Papua through transmigration projects has been run since in 1973. Unfortunately, not all the projects were well developed, causing the social, economic, and physical environmental problems. These problems resulted in the negative impact for the life of the transmigration people. For that reason, the community empowerment for the unlucky transmigration people by handling the physical and non physical aspects is very important. This paper will describe the importance of providing spatial data and information biophysical wetland as an initial step in empowering people who live in the wetland resource.
Changes of Groundwater Quality in the Sorrounding Pollution Sources Due to Earthquake Dissaster Sudarmadji, Sudarmadji
Forum Geografi Vol 20, No 2 (2006): December 2006
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Groundwater is the main domestic water supply of the population of the Yogyakarta Special Region, both in the urban and as well as in the rural area due to its quantity and quality advantages. The rapid population growth has caused an increase of groundwater demand, consequently it is facing some problems to the sustainability of groundwater supply. Lowering of groundwater level has been observed in some places, as well as the degradation of groundwater quality. Earthquake which stroke Yogyakarta on 27 May 2006, damaged buildings and other infrastructures in the area, including roads and bridges. It might also damage the underground structures such as septic tanks, and pipes underneath the earth surface. It might cause cracking of the geologic structures. Furthermore, the damage of underneath infrastructures might create groundwater quality changes in the area. Some complains of local community on lowering and increasing groundwater level and groundwater quality changes were noted. Field observation and investigation were conducted, including collection of groundwater samples close to (the) pollution sources. Laboratory analyses indicated that some parameters increased to exceed the drinking water quality standards. The high content of Coli form bacteria possibly was caused by contamination of nearby septic tanks or other pollution sources to the observed groundwater in the dug well.
Hydromorphology of the Unconfined Groundwater in the South of Klaten District (Data Before Earthquake Mei 27th 2006) Santosa, Langgeng Wahyu
Forum Geografi Vol 20, No 2 (2006): December 2006
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

There are some characteristics and distributions of unconfined groundwater variation in the research area. Those are related to a system of water supply and consumptive use for drinking water. Variation of the groundwater characteristic depends on variation of morphology. Therefore, it is needed to delineate hydromorphology units of the regions as a base on groundwater resources management, especially for drinking water. The aims of the research are: (1) to study of the characteristic and distribution of unconfined groundwater variations base on landform units, (2) to study the factors that affect such variations, and (3) to establish the hydromorphology units of the regions for groundwater resources management, especially for drinking water. The method used in this research is landform approach and field survey. The sampling method is stratified sampling, based on landform as the analysis approach. Result of the research shows that there are some variations of groundwater characteristic at each landform. Landforms which have good groundwater characteristic are Hydromorphology Unit of Fluvio Volcanic Plain of Young Merapi (except Bayat region) and Hydromorphology Unit of Volcanic Foot Plain of Young Merapi. At those units, there are good quality of groundwater, bicarbonate water (hydrochemical type I), having low electric conductivity, shallow of water table, low in fluctuation, and middle to fast class in aquifer permeability. Those units are the most potential unconfined groundwater resources management for drinking water. The units which have poor groundwater characteristic are Hidromorphology Unit in Bayat Region, including Undulating Alluvial Plain, Fluvio Volcanic Plain of Young Merapi, and Swamp Alluvial Plain. Generally, the groundwater quality is medium to poor, the hydrochemical type is Va (initiation process of connate water) and type III (evaporate water), shallow up to medium of water table, and low to middle class of aquifer permeability. The taste of groundwater is brackish to saline with high concentration of chloride.
Groundwater Conservation Model in Coastal Plain of Semarang City Purnama, Setyawan; Kurniawan, Andri; Sudaryatno, Sudaryatno
Forum Geografi Vol 20, No 2 (2006): December 2006
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

There are three objectives of this research. First, to build the model of groundwater usage and conservation in the research area. Second, to identify the behaviour of model in various usages and conservations. Third, to formulate the policy of groundwater resources management that suitable with the region caracteristic. As a result, show that the programme Powersim 2.5c can be used dan applied in hydrologis, especially in building groundwater conservation model. The conservation model that significantly suitable are to decrease the usage of water in domestic and industrial sector. Relationship by the third objectives, the some policies that can be carried out to conservations, namely decreasing water usage, restricting industrial growth, restricting settlement growth (especially in recharge area) and increasing the capacity of PDAM production.
Analysis Landslide Hazard in Banjarmangu Sub District, Banjarnegara District Priyono, Kuswaji Dwi; Priyana, Yuli; Priyono, Priyono
Forum Geografi Vol 20, No 2 (2006): December 2006
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

The objective of the research is to find the most suitable soil conservation practice that may be applied to control landslide hazard. In order to achieve that objective, some research steps must be done, are: (1) to identify the land characteristics of the study area that is based on the understanding of some factors that caused and triggered the landslide hazard, i.e.: slope morphology, rocks/soils characteristics, climatic condition, and landuse; (2) to study the types of landslide that occurs in every landforms and determine the area having ideal landslide form; The proposed landslide in this research is the process of masswasting down-slope as a result of the gravitation action on materials being sliding. The landslide types is including creep, slide, slump, and rocks/soils fall. The methods that being applied in the research include field survey methods and the method for determining landslide hazard by using geographic information techniques. Field survey method was intended to characterize the location of every landslide that have been happened in the study area. The results of field survey were applied as materials for determinating the grade of landslide hazard. Scorring and weighting methods of factors that influence landslide was apllied to determine the grade of landslide hazard. Scor and weight were not same for every parameters used for evaluation. The result of field research shows that landslide happen in every landform unit The study area can be devided into 9 landform unit. The landform units are differentiated into the landslide hazard classes, the study area there were found 5 classes of landslide hazard, namely: (1) vary low hazard equal to 16,65% (1 landform unit); (2) low hazard equal to 7,63% (1 landform unit); (3) medium hazard equal to 37,58% (3 landform unit); (4) high hazard equal to 25,41% (2 landforms unit); and (5) highest hazard equal to 12,73% (2 landform unit). Evaluation of landslide hazard shows hat most of study area have high risk to slide as a result of complex interaction between many factors of landslide.
The inventorying and mapping of landslide potential in Manado – Indonesia Kumajas, Mithel
Forum Geografi Vol 20, No 2 (2006): December 2006
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Landslide constitutes a frequent problem occurs in Manado. It happens for many times from year to year and brings both material disadvantage and casualty. The way and hilly topography of Manado, unstabel geological condition, high rainfall, and the improper land use are assumed to be the trigger for the problem. The objective of this study is to inventory and map landslide potential area as well as to design the preventive plan. Mapping method employs spatial approach by using land unit as the analysis unit. The technique of analysis applies the assistance of GIS with its ArcView soft ware. The result of mapping shows that the level landslide potential from potential until very potential category in Manado is 1.815,72 Ha; potential is 1282,10 ha and very potential category is 533,62 ha. The faktors cause the landslide comprise of rocky declivity, high rainfall, and the condition of stone as well as the unstabel and porous soil. The existence of Cesar zone extends to the center of the city and the use of settlement land located in improper zone become the trigger that quicken the occurrence of landslide. The strategy implemented to manage the landslide potential area can be carried out through 1) law enforcement in relation to city lay out, 2) landslide prevention through civil and vegetative technique, 3) the improvement of social consciousness of the danger of landslide disaster and the attempt for social empowerment, and 4) the provision of the landslide potential danger map as the ground for policy making in the effort to manage the landslide disaster.
The inventorying and mapping of landslide potential in Manado – Indonesia Kumajas, Mithel
Forum Geografi Vol 20, No 2 (2006): December 2006
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v20i2.1815

Abstract

Landslide constitutes a frequent problem occurs in Manado. It happens for many times from year to year and brings both material disadvantage and casualty. The way and hilly topography of Manado, unstabel geological condition, high rainfall, and the improper land use are assumed to be the trigger for the problem. The objective of this study is to inventory and map landslide potential area as well as to design the preventive plan. Mapping method employs spatial approach by using land unit as the analysis unit. The technique of analysis applies the assistance of GIS with its ArcView soft ware. The result of mapping shows that the level landslide potential from potential until very potential category in Manado is 1.815,72 Ha; potential is 1282,10 ha and very potential category is 533,62 ha. The faktors cause the landslide comprise of rocky declivity, high rainfall, and the condition of stone as well as the unstabel and porous soil. The existence of Cesar zone extends to the center of the city and the use of settlement land located in improper zone become the trigger that quicken the occurrence of landslide. The strategy implemented to manage the landslide potential area can be carried out through 1) law enforcement in relation to city lay out, 2) landslide prevention through civil and vegetative technique, 3) the improvement of social consciousness of the danger of landslide disaster and the attempt for social empowerment, and 4) the provision of the landslide potential danger map as the ground for policy making in the effort to manage the landslide disaster.
The Hierarchy of Earthquake and Tsunami: The Cases of Aceh, Nias, Bantul, Pangandaran, and Sunda Staits Hardjono, Imam
Forum Geografi Vol 20, No 2 (2006): December 2006
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v20i2.1811

Abstract

Indonesia is vulnerable to earthquake and tsunami disaster because it is located in the fracture zone between the continental and oceanic lithospheres, running from the west of Sumatera, though the south of Java, NTB, Sulawesi to Papua. In the theoretical framework of Indonesian tectonic lithosphere, this zone is known as Sula-spuur. The frequent earthquake and tsunamis in Indonesia justify the theory that the earth will always seeks for dynamic self-balance through oceanic basin as well as continental basement expansions. Based on the tectonic lithosphere analysis, the anatomy of earthquake and tsunami disaster in Java falls into two different paths. The first is northwestward path in Western Java following the Semangko fault trend, from Pangandaran/Cilacap through Kadipaten, Subang to Jakarta. The other is the northeastward path in Central Java and East Java running from Bantul through Prambanan, Klaten to Rembang. The two hats correspond to the seventeen-kilometre-deep-underground fracture involving basement rocks resulted from the area shifting evolution during the limestone age prior to the existence of limestone in Indonesia. Based on the evidences found in Bantul- Klaten earthquake, the question necessary to raise is whether similar earthquake may happen in Jakarta.
Analysis Landslide Hazard in Banjarmangu Sub District, Banjarnegara District Priyono, Kuswaji Dwi; Priyana, Yuli; Priyono, Priyono
Forum Geografi Vol 20, No 2 (2006): December 2006
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v20i2.1810

Abstract

The objective of the research is to find the most suitable soil conservation practice that may be applied to control landslide hazard. In order to achieve that objective, some research steps must be done, are: (1) to identify the land characteristics of the study area that is based on the understanding of some factors that caused and triggered the landslide hazard, i.e.: slope morphology, rocks/soils characteristics, climatic condition, and landuse; (2) to study the types of landslide that occurs in every landforms and determine the area having ideal landslide form; The proposed landslide in this research is the process of masswasting down-slope as a result of the gravitation action on materials being sliding. The landslide types is including creep, slide, slump, and rocks/soils fall. The methods that being applied in the research include field survey methods and the method for determining landslide hazard by using geographic information techniques. Field survey method was intended to characterize the location of every landslide that have been happened in the study area. The results of field survey were applied as materials for determinating the grade of landslide hazard. Scorring and weighting methods of factors that influence landslide was apllied to determine the grade of landslide hazard. Scor and weight were not same for every parameters used for evaluation. The result of field research shows that landslide happen in every landform unit The study area can be devided into 9 landform unit. The landform units are differentiated into the landslide hazard classes, the study area there were found 5 classes of landslide hazard, namely: (1) vary low hazard equal to 16,65% (1 landform unit); (2) low hazard equal to 7,63% (1 landform unit); (3) medium hazard equal to 37,58% (3 landform unit); (4) high hazard equal to 25,41% (2 landforms unit); and (5) highest hazard equal to 12,73% (2 landform unit). Evaluation of landslide hazard shows hat most of study area have high risk to slide as a result of complex interaction between many factors of landslide.

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