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Indonesian Journal of Geography

ijg
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Published by Universitas Gadjah Mada

ISSN : 00249521 EISSN : 23549114 DOI : -

Core Subject : Science,

Earth & Planetary Sciences

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.

Arjuna Subject : -

Articles 613 Documents

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Distribution of Nitrate Household Waste and Groundwater Flow Direction around Code River, Yogyakarta, Indonesia Muryanto Muryanto; Suntoro Suntoro; Totok Gunawan; Prabang Setyono; Afid Nurkholis; Nurisa Fajri Wijayanti
Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

The nitrate concentrations in shallow groundwater of the Yogyakarta City and its surroundings has increased to about twenty times in the period 1985-2018. The objective of this study was to analyse the distribution of nitrate concentrations in water well around the Code River, Yogyakarta. Flownets mapping was performed to find out the distribution and direction of potential groundwater pollution. Nitrate concentration was analysed by taking 18 groundwater samples scattered in the upstream, midstream and downstream areas of the Code River. The results of this study indicate that nitrate concentrations in the water well of upstream and downstream areas could still be used as a source of drinking water and recreation-irrigation-livestock. Meanwhile, the nitrate concentration in water well of the midstream area of the Code River, Yogyakarta City, mostly (80% of the sample) did not meet all classes of water quality standards. Human activities in the densely populated settlements were the main factors that influence nitrate pollution. Furthermore, groundwater flow in the study area leads from north to south and towards the Code River. This condition indicates that the nitrate concentrations in the groundwater can be a source of a pollutant for the Code River.

The Spreading of Vernacular Architecture at the Riverways of South Sumatra, Indonesia Maya Fitri Oktarini
Indonesian Journal of Geography Vol 51, No 3 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

The development of past settlements was supported by riverways connecting many regions with ethnic diversities. Inter-ethnic dissemination and contact created new cultural combinations. In the southern part of Sumatra, there are two types of stilt houses: highland architecture and lowland architecture. Both architectures are developed by different ethnic groups spread along different riverways. This study focuses on identifying and analyzing the influence of the riverway in the typology of the vernacular stilt house. The architectural typology data was confirmed by field observations and interviews. The analysis was carried out through the Geographic Information System to correlate the influence of the riverway and the ethnic culture on the distribution of the architecture and its transformations. The results show that the river as a transportation route takes up a more dominant role in the spread of architecture than the boundary of the ethnic culture. The cultural significance shows that the highland architecture in the upstream area has a more original and simpler character than the lowland architecture in the downstream area. The riverway exposes diverse cultures to blend into more complex architecture.

Contesting the Social Spaces: Gender Relations of Literary Communities in Yogyakarta and Surakarta Wening Udasmoro; Saeful Anwar
Indonesian Journal of Geography Vol 51, No 3 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

This research seeks to map the gender relations within literary communities and their contestations in gaining social and financial capital in Yogyakarta and Surakarta social spaces. The presence of literary communities in these spaces, on the one hand, explains the local and specific self-identities of the communities, as well as their heterogeneity in gender relations. In particular, this research maps these communities' differences in expressions, trajectories (visions for the future), themes, narrations, language, and networks based on their gender relations. The Geographic Information System (GIS) method is used to map and explore the gender issues in these literary communities. By understanding the mapping of these literary communities, the dynamics of the social spaces used by these communities can be traced synchronically within a specific period. It can also be followed up when the database is used diachronically over time. This research finds that social spaces that enable open narration are insufficient to ensure the equality of women and men. Flexible domestic spaces for women are also necessary to ensure women to be active in creating the trajectory of the literary communities since they have capacities to do it.

The Effect of Baseline Component Correlation on the Design of GNSS Network Configuration for Sermo Reservoir Deformation Monitoring Yulaikhah Yulaikhah; Subagyo Pramumijoyo; Nurrohmat Widjajanti
Indonesian Journal of Geography Vol 51, No 2 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

The condition of the geological structure in the surrounding Sermo reservoir shows that there is a fault crossing the reservoir. Deformation monitoring of that fault has been carried out by conducting GNSS campaigns at 15 monitoring stations simultaneously. However, those campaigns were not well designed. With such a design, it took many instruments and spent much money. For the next GNSS campaign, it should be designed so that the optimal network configuration is obtained and the cost can be reduced. In the design of deformation monitoring network, sensitivity criteria become very important for detecting the deformations. In GNSS relative positioning, the baseline components are correlated, but this correlation is often ignored. This research examined the effect of baseline component correlations on the design results of the GNSS configuration of the Sermo Fault network based on sensitivity criterion. In this case, the western side of the fault was taken as a reference, while the other side as an object moving relatively against the western side. This study found that the baseline component correlation affects the results of GNSS network configuration. Considering the correlation could result a sensitive network configuration with a fewer baseline; therefore, the cost and time of field surveys can be reduced. It can be said that the baseline component correlation needs to be taken into account in the configuration design of deformation monitoring network.

Improving Numerical Weather Prediction of Rainfall Events Using Radar Data Assimilation Miranti Indri Hastuti; Jaka Anugrah Ivanda Paski; Fatkhuroyan Fatkhuroyan
Indonesian Journal of Geography Vol 51, No 3 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Data assimilation is one of method to improve initial atmospheric conditions data in numerical weather prediction. The assimilation of weather radar data that has quite extensive and tight data is considered to be able to improve the quality of weather prediction and analysis. This study aims to investigate the effect of assimilation of Doppler weather radar data in Weather Research Forecasting (WRF) numerical model for the prediction of heavy rain events in the Jabodetabek area with dates representing four seasons respectively on 20 February 2017, 3 April 2017, 13 June 2017, and 9 November 2017. For this purpose, the reflectivity (Z) and radial velocity (V) data from Plan Position Indicator (PPI) product and reflectivity (Z) data from Constant Altitude PPI (CAPPI) product were assimilated using WRFDA (WRF Data Assimilation) numerical model with 3DVar (The Three Dimensional Variational) system. The output of radar data assimilation and without assimilation of the numerical model of WRF is verified by spatial with GSMaP data and by point with precipitation observation data. In general, WRF radar assimilation provides a better simulation of spatial and point rain events compared to the WRF model without assimilation which is improvements of rain prediction from WRF radar data assimilation would be more visible in areas close to radar sources and not echo-blocked from fixed objects, and more visible during the rainy season

Urban Temperature Profiles and Land Cover Detection in the Jakarta Metropolitan Area using Remote Sensing Hasti Widyasamratri; Kazuyoshi Souma; Tadashi Suetsugi
Indonesian Journal of Geography Vol 51, No 3 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

This research aim to investigate the urban thermal environment profile and land cover classification in the Jakarta Metropolitan Area (JMA) in 1989 and 2013. Thermal environment conducted by installing fix point ground measurement of air temperature and land surface temperature. The land cover classification was carried out by using Landsat TM 5 and Landsat 7 ETM+ data sets. The diurnal variation of air temperature shows that Urban Heat Island (UHI) was occurring in urban and suburban JMA, which can be seen the slower cooling period in the urban area than suburban areas. Positive correlation between air temperature (Ta) and land surface temperature (Ts) on the brush (r2 = 0.78) and the asphalt surface (r2= 0.88) is clearly shown during the study. The rapid urbanization was detected during 1989 to 2013 where the urban sprawl is spread over to the whole area of JMA. Urban built up is the dominant of high increase due to years, while vegetation is decreasing.

Editorial Information and Table of Contents Editorial Information and Table of Contents
Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Predictive numerical modeling of groundwater drawdown impacts in Jakarta Iwan Nursyriwan; Muhammad Bisri; Lily Montarcih; Ery Suhartanto
Indonesian Journal of Geography Vol 51, No 3 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

An excessive groundwater usage is happening in Jakarta, Indonesia, due to the population growth and industrial development so that it experiences a significant groundwater drawdown which could enhance the risk of seawater intrusion and land subsidence. Existing conditions in 2018 show that seawater intrusion occurred at the Western and Central coastal area and land subsidence happen in the Northern and Central part. This research, a numerical simulation, is conducted by modeling such causality during the critical period, the next 20 years. The result shows that for every groundwater drawdown of 10 m/year, it will cause intrusion 0.7 km/year in the Western and Central and 1.1 km/year in the Eastern area after 2028. The 10 m/year groundwater drawdown also results in land subsidence of 5.7 cm/year in the Northern and 2.5 cm/year in Central Jakarta. This result is useful as an input for groundwater management policies and to prevent the environmental impacts occurred at other large coastal cities.

Spectral Characteristics of Plastic Debris in the Beach: Case Study of Makassar Coastal Area Ahmad Faizal; Shinta Werorilangi; Wasir Samad
Indonesian Journal of Geography Vol 52, No 1 (2020): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Plastic debris becomes a global problem that threatens the coastal ecosystems, and the supralittoral area (beach) turns to be a place for plastic debris to accumulate. Data from the United Nations (UN) states that Indonesia is the second plastic debris contributor in world waters. This study aimed to examine the spectral characteristics of plastic debris accumulated on the beach. The data was collected from the coast of Makassar at 3 different stations: Jenneberang River estuary, Losari Beach and Tallo River estuary. The spectral sample was measured using a 4000 A spectroradiometer that works on a wavelength spectrum of 340 - 1040 nm. The results showed that the optimum value for plastic debris identification in the coastal area at low tide (dry sand) is 450-670 nm and at high tide (wet sand) is 450-950 nm. This value will be a reference in the remote sensing method, especially multispectral classification in mapping plastic debris found in coastal areas, and will be one solution to effectively mapping plastic debris.

Urban Forced Eviction: Experiences in the Metropolitan City of Lagos, Nigeria Ayobami Abayomi Popoola; Michael Olaitan Olatunde; Hangwelani Hope Magidimisha; Abiodun Amuda; Bamiji Michael Adeleye; Lovemore Chipungu
Indonesian Journal of Geography Vol 52, No 1 (2020): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Urban poverty coupled with housing shortages have contributed to the proliferation of informal settlements and slums. This is one of the complex problems arising out of urbanization and which is piling pressure on urban authorities to use unorthodox methods (such as forced evictions) to ameliorate the situation. This paper revisits the use of forced migration in Badia East Community of Lagos city. Using the human security concept as a framework for analysis, the paper chronicles how urban forced migration is used as a tool to relocate the vulnerable urban poor by urban authorities in their bid to achieve sustainable development. Critical insight into the nature of these migrations was achieved by gathering data using the mixed approach. Finding from the study revealed rampant human abuse through the use of force during the eviction process. The paper concludes by recommending that the government should use best practices, (such as adequate government-assistance) during relocations and rehousing option explored.

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