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INDONESIA
Indonesian Journal of Geography
ISSN : 00249521     EISSN : 23549114     DOI : -
Core Subject : Science,
Indonesian Journal of Geography ISSN 2354-9114 (online), ISSN 0024-9521 (print) is an international journal of Geography published by the Faculty of Geography, Universitas Gadjah Mada in collaboration with The Indonesian Geographers Association. Our scope of publications includes physical geography, human geography, regional planning and development, cartography, remote sensing, and geographic information system. IJG publishes its issues three times a year in April, August, and December.
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Articles 4 Documents
Search results for , issue "Vol 36, No 2 (2004): Indonesian Journal of Geography" : 4 Documents clear
Principal component analysis for identifying period of seasons in Indonesia Dewi Galuh Condro Kirono
Indonesian Journal of Geography Vol 36, No 2 (2004): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.2211

Abstract

The seasonal variability of Indonesian rainfall is almost entirely controlled by the Asian monsoon and so displays two distinct seasons, i.e. wet and dry seasons with transition periods in between. The onset of the monsoon varies with places, therefore, when dealing with seasonal rainfall, different researchers/authors have different way referring to the seasons. Hence, one definition may not be appropriate for all places. This problem creates a necessity for identifying the period of the season so that it can be used for Indonesia as a whole.This paper examines the spatial variation of the seasons over the Indonesia region and demonstrates the application of Principal Component Analysis (PCA) to solve the above mentioned problem, namely to identify the period of the seasons in Indonesia as a unity. The analysis is performed using monthly rainfall data from 63 stations spread across the country covering the period of 1947 to 1999 (52 years).The results support the fact that the wet season onset starts early in the northwestern part of Sumatra and propagates eastward and southward. It is not surprising if the north-western part of the country experiences a longer wet season than the east-northern part does. It is also shown that PCA is a useful tool for identifying the period of the season in Indonesia. Through the analysis, it is found that there are three types of rainfalls which have important influence on the year to year variation of the annual rainfall, i.e: the wet season (December to March), the dry season (May to September), and the dry-to-wet transition (October to November).
growth pattern and the industrial development of the lagos region, nigeria Dickson Dare Ajayi
Indonesian Journal of Geography Vol 36, No 2 (2004): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.2212

Abstract

This paper examines the nature, growth and spatial pattern of industries within the Lagos Region. Industrial activities in this region grew progressively over the year from mere brickwork, palm oil mills, printing press, soap factory, and metal container factory to capital intensive manufacturing. Indeed, the number of industrial establishments increased from 122 in 1962 to 637 in 1993. Lagos developed into Nigeria's leading industrial center; especially following the expansion in its service and administrative sectors. Whereas, chemicals and pharmaceutical; and basic metal, iron and steel and fabricated metal products industry groups dominate in industrial scene, wood and wood products (including furniture); and non-metallic mineral products are rare. The spatial pattern shows that industrial establishments vary amongst the industrial estates/areas, and also among the industry groups. Ikeja/Ogballsheri industrial estate/area dominates the industrial scene.
The present and the Archaic River Valley morphology and groundwater condition in the Plaosan Temple complex Central Java-Indonesia Eko Haryono; J. Susetyo Edy Y; Imam Fauzi; Didik S; Wahyu Broto R
Indonesian Journal of Geography Vol 36, No 2 (2004): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.2213

Abstract

The Plaosan Temple which was built during the eighth and tenth century AD is one of four temple complexes in the Prambanan area, Central Java-Indonesia. On going excavation in the temple complex discloses the occurrence of canals along the outer fences. The canals are eight meters wide and four meters deep. This article aims at reconstructing archaic river course and groundwater condition due to the construction of the canals. Aerial photo interpretation, excavation, ground water level measurement and valley morphology measurement reveal an anomaly of the nearest river in the temple complex. The river had seemingly been bypassed south-eastward to its tributary just before entering Plaosan Temple complex. Groundwater level dropped and its flow direction changed from nearly southward to south-eastward direction. These phenomena indicate that the canals were groundwater-discharged canals.
Vulnerability assessment of groundwater to contamination using drastic method: Study in Ngemplak, Ngaglik and Sleman Districts of Sleman Regency, Yogyakarta Special Province M. Widyastuti
Indonesian Journal of Geography Vol 36, No 2 (2004): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.2214

Abstract

This research is based on the assumption that the physical environ-ment may provide some degree of protection to groundwater against the natural and human impacts, especially with regard to contamination entering subsurface environment. Study on groundwater vulnerability to contamination .become important. It can be used as a valuable planning tool to overcome the problem of groundwater quality due to uncontrolled land development and undesirable activities. The aims of this study are : 1) to study the distribution of DRASTIC parameters, which are depth to water table, rainfall, aquifer media, soil media, topography, impact of vadose zone, and conductivity; 2) to analyze the vulnerability of groundwater to contaminationThe stua5, was performed by weighting and rating method of DRASTIC parameters. The degree of groundwater vulnerability to contamination is depicted in DRASTIC Index. DRASTIC Index is determined by overall sum of all multiplication between score and weight number ofeach parameter. Data manipulation and data analysis were all performed using Geographic Information System (Arc/View version 3.2). The vulnerability map of groundwater to contamination has been generated using overlay operation of DRASTIC parameters.The result showed that DRASTIC index varies between 73 to 172 intervals. Hence, the indexes were categorized into five level of groundwater vulnerability, namely invulnerable (73-92), low vulnerable (93-112), moderate vulnerable (113-132), high vulnerable (133-152) and very high vulnerable (153-172). It is found that more than 50 % of the study area is covered by high and very high vulnerability of groundwater to contamination. The vulnerability level and its area as follows : vo• high 92974.63 ha or 28.18%), high (7049.86 ha or 66.79 %), moderate (529.90 ha or 5.02 %). low (0.148 ha or 0.0014 %) and invulnerable (0.003 ha or 0.0003 %).

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