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Forum Geografi

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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 22 Documents

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Search results for , issue "Vol 30, No 2 (2016): December 2016" : 22 Documents clear

Seasonal and Inter Annual Variation of Sea Surface Temperature in the Indonesian Waters Martono, Martono
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.v30i2.1530

Sea surface temperature plays an important role in air-sea interactions. This research was conducted to understand seasonal and interannual variations of sea surface temperature in the Indonesian waters. The data used in this research was daily sea surface temperature in 1986 to 2015 which was obtained from the Physical Oceanography Distributed Active Archive Center - National Aeronautics and Space Administration. Method used in this study was the anomaly analysis. The result showed that the seasonal and interannual variations of sea surface temperature in the Indonesian waters varied. Seasonal variations of SST in the Makasar Strait, Sulawesi Sea, and Halmahera Sea were low. High seasonal variations of sea surface temperature occurred in the southern waters of Java, Timor Sea, Arafura Sea, and Banda Sea, which were allegedly due to the upwelling process. In addition, interannual variation of sea surface temperature in the Indonesian waters fluctuated. From 1986 to 2000, it showed a negative anomaly dominant. Meanwhile, from 2001 to 2015, it showed a positive anomaly dominant. The effect of Indian Ocean Dipole on the fluctuation of sea surface temperature in the Indonesian waters was stronger than ENSO. Within the last 30 years, the sea surface temperature in the Indonesian water indicated a rising trend. The highest sea surface temperature rise occurred in the Halmahera Sea that reached 0.66 OC/30 years and the lowest was in the Timor Sea of 0.36 OC/30 years.

Using Water Balance to Analyze Water Availability for Communities ( A Case Study in Some Areas of Bengawan Solo Watershed) Alif Noor Anna; Kuswaji Dwi Priyono; Suharjo Suharjo; Yuli Priyana
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.v30i2.2550

This study aimed: (a) to determine the general water balance at the Upstream and Midstream of Bengawan Solo Watershed by using Thornthwaite-Mather model, and (b) to determine the fulfillment of domestic water demand in the Upstream and Midstream of Bengawan Solo Watershed. Prevailing climate change has affected the condition of water source in Upstream and Midstream of Bengawan Solo Watershed. One of the impacts was extreme fluctuation of meteorological water availability that might cause flood and drought. Survey was selected as the research method while descriptive quantitative method was used for data analysis. The findings indicated the difference between precipitation and corrected evapotranspiration (P-EP) at the Upstream and Midstream of Bengawan Solo Watershed was between (-11.19 mm) to (78.56 mm). The highest value was obtained by Bambang Sub-watershed and the lowest was Wiroko Temon Sub-watershed. Positive value indicated the water surplus while negative value indicated water deficit. Domestic water demand for local communities was in the range of 50,782,500 liters to 131,690,700 liters, and the level of water availability varied, namely fulfilled and unfulfilled.

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

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.

Livelihood Strategies as Responses to Water Availability in Pusur Subwatershed, Bengawan Solo Rathna Wijayanti; Muhammad Baiquni; Rika Harini
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.v30i2.2618

Water availability has a significant role on human life, particularly for the rural, agrarian communities. This study aimed to investigate the diverse conditions of water availability in Pusur sub-watershed, Bengawan Solo watershed, and the livelihood strategies of the local community in responding to the water availability. The study used both quantitative and qualitative methods of data analysis, and the data was collected through questionnaire, in-depth interview, and observation. On the water availability, the study used the following variables: (1) quality, (2) quantity, (3) spatial and temporal distribution, (4) access, (5) social-economy, and (5) institutional aspect. On the livelihood strategies, it uses: (1) reaction and (2) anticipation for water deficit. In term of sampling methods, the study used area and purposive sampling, by splitting the study site into the upper, middle, and lower area. The analysis of this study indicates that the level of water availability in the upper area is considered low. The community living in the upper area depends upon rainwater for its agricultural sector, and upon the water supply distributed by pipelines and tanker trucks for its household. The study also indicates that the middle area has abundant water supply, but the quality has been declined due to pollution, poor sanitation system, and potential conflict among the community members. Meanwhile, in the lower area, particularly in the dry season, irrigation water has been inadequate. Responding to the diverse water availability, the community has applied the following livelihood strategies: (1) leaving the agricultural land uncultivated in the upper area, and (2) pumping wells and rivers in the middle and lower areas. In addition, as part of its precautions actions, the community has applied: (1) agroforestry system at the upper area, (2) improved the irrigation system of the middle area, and (3) creating wells and using water pumps in the lower area.

Seasonal and Inter Annual Variation of Sea Surface Temperature in the Indonesian Waters Martono Martono
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.v30i2.1530

Performance Evaluation of Tuntang Watershed based on Quantity and Quality of Water Ugro Hari Murtiono; Paimin Paimin
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.v30i2.1708

The objective of the study was to evaluate the performance of Tuntang Catchment based on water quantity and quality area ranging from its upstream to downstream. The method used to determine the water quantity was by carrying out ground study on water discharge in the dry season (June 2011) in the research site, while the water quality was determined by conducting a laboratory analysis on the samples obtained from the sites in both the rainy and dry season (January and June 2011). The results indicated that the quantity of water discharge in Tuntang River was categorized “good”, although it was utilized for many uses such as irrigation, hydropower, and drinking water. Most of water discharges were mainly supplied from the upstream of Rawa Pening Lake. The water quality determined from the parameters of total dissolved solids, conductivity, pH, phosphate, and nitrate could be classified as “good”, meanwhile, the turbidity and dissolved oxygen were classified as “poor”.

System Dynamic Approach to Support Decision in Maintaining Water Availability (Case Study in Aek Silang Sub-Watershed, the Lake of Toba) Irwan Valentinus Sihotang; S Sudarmadji; Ig.L. Setyawan Purnama; Muhammad Baiquni
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.v30i2.2719

Water availability is immensely affected by the correlation among land use change, rainfall change, and population growth. One of analysis tools to discover how the correlation goes on in a hydrological process is by dynamic modelling approaching. The dynamic modelling result can be used for a substructure in decisions making as supports to maintain water availability for fulfilling domestic needs, agriculture, and Micro-Hydro Power (MHP). The aims of this study are to evaluate water availability as a long-term impact on land use change, rainfall change, and population growth with dynamic modelling and as a scenario which is required as basic information to make decisions in maintaining water availability. Analysis method which is applied in this study is dynamic modelling to long term evaluate water availability and validate using Mean Average Percentage Error method (MAPE). The analysis showed that the combination of rainfall of 2312.09 mm/yr, rainfall intensity of 0.340 mm/h, population growth rate of 7.23%, declined forest area of 1.513 ha/yr, declined shrub/unproductive land of 318.113 ha/yr, increased agricultural land of 7.627 ha/yr, and increased settlement area of 0.473 ha/yr, yielded the estimation of the fail in sustaining water sources in 2090 or the next 79 years from 2011 since the water deficit has reached approximately 3,249,881.02 m3. The value of validation modelling with MAPE method is 8.90, it is a dynamic modelling which is managed nearly the same with actual condition.

Impacts of Climate Change (El Nino, La Nina, and Sea Level) on the Coastal Area of Cilacap Regency Lilik S. Supriatin; Martono Martono
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.v30i2.2449

This research was conducted to determine the impact of El Nino and La Nina on rainfall as well as the impact of El Nino, La Nina, and sea level on coastal flooding in Cilacap Regency. The methods used in this study were statistical analysis and simulation. The results of this study were El Nino caused diminished rainfall in Cilacap regency between 295 to 1665 mm. Meanwhile, La Nina caused surplus rainfall between 189 - 691 mm/year in compared with annual climatological rainfall. When ENSO phenomenon (El Nino) occurred, it caused sea level anomaly to fall, including in 1994, 1997, and 2002 of -11.63 cm, -11.5 cm, and -4.95 cm, respectively. Meanwhile, in La Nina years in 1999 and 2000, the sea level anomaly enhanced by 2.55 cm and 5.03 cm, respectively. The result of sea level projection by employing simulation model in this study was compared with the simulation results of the IPCC that obtained a correlation coefficient r of 0.99. Based on the simulation results, the 8 (eight) sub-districts in Cilacap Regency located in the coastal area potentially endure flood due to the impacts of global warming and La Nina with a diverse predicted year of occurrence depending on the altitude of each sub-district.

An Estimation of Earthquake Impact to Population in Makassar by Probabilistic Approach Bambang Sunardi; Sulastri Sulastri
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.v30i2.2591

Makassar is one of Indonesian big cities with rapid growth rate, but not totally safe from earthquake hazard. This condition led study on affected population by earthquakes in this city are important to do. This paper estimated the population of Makassar City threatened by the probabilistic earthquake hazard. In this current study, earthquake hazard in the forms of peak ground acceleration (PGA) and spectral acceleration, estimated by using Probabilistic Seismic Hazards Analysis (PSHA). The PSHA result then overlaid with administration map and population data to obtain distribution and percentage of population threatened by the probabilistic earthquake hazard. The results showed the smallest value of ground acceleration located in the south-west (Tamalate sub district), further north increased and reached the highest value in the northeast (Biring Kanaya sub district). Both Tamalate and Biringkanaya can be classified as rural area with low population density. The urban area of Makassar, which is the concentration of population, located in the centre of Makassar, got the middle earthquake hazard.

Acknowledgement for Reviewers in 2016 Editors Forum Geografi
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.v30i2.2888

The editors of Forum Geografi would like to express their sincere gratitude to the following reviewers for assessing manuscripts in Volume 30 2016. Prof. Dr. Junun Sartohadi, Universitas Gadjah Mada, IndonesiaProf. Dr. Ir. Hidayat Pawitan, Department of Geophysics and Meteorology, Bogor Agricultural University, IndonesiaDr Muhammad Kamal, UGM, IndonesiaSupari, BMKG Indonesia, Indonesia; Universiti Kebangsaan Malaysia, School of Environmental and Natural Resource Sciences, Bangi, MalaysiaMuhammad Haikal Karana Sitepu, University of Leeds, United KingdomDr. Yanto, Civil, Universitas Jenderal Soedirman, Indonesia R Muhammad Amin Sunarhadi, Universitas Muhammadiyah SurakartaDr. Sukamdi, IndonesiaDr. Peter Oberle, Institute for Water and River Basin Management (IWG)Karlsruhe Institute for Technology (KIT)KarlsruheGermany, GermanyProf. Dr. Muhammad Aris Marfai, Universitas Gadjah MadaDr. Pramaditya Wicaksono, Cartography and Remote Sensing Dept. of Geographic Information Science Faculty of Geography Universitas Gadjah Mada, IndonesiaDr. Sushil K. Joshi, Indian Institute of Remote Sensing (India), IndiaDr. Djati Mardiatno, UGM, IndonesiaDr. Purnama Budi Santosa, Gadjah Mada University, IndonesiaDr. Donaldi S. Permana, Center for Research and Development Indonesian Agency for Meteorology Climatology and Geophysics (BMKG); Byrd Polar and Climate Research Center and School of Earth Sciences, Ohio State University, Columbus, Ohio, USA, IndonesiaA Cipta, Geological Agency of Indonesia, Jalan Diponegoro No. 57, Bandung 40122, Indonesia Australian National University, Research School of Earth Sciences, Building 142, Mills Road, Canberra, ACT 0200, Australia, AustraliaDr Takanori Horii, Research and Development Center for Global Change (RCGC), Strategic Research and Development Area, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Kanagawa, Japan, JapanHari Agung Adrianto, Institute Pertanian Bogor, IndonesiaDr. Adriana García-Rama, Department of Land, Environment, Agriculture and Forestry, University of Padova, Italy, ItalyDr. Kuswaji Dwi Priyono, Fak Geografi UMS, IndonesiaDr. Rini Rachmawati, Faculty of Geography, Universitas Gajah Mada, IndonesiaDr. Dyah R Hisbaron ,Faculty of Geography, Universitas Gajah MadaDr. Saut Sagala, Intitut Teknologi Bandung, Indonesia We greatly appreciate the contribution of expert reviewer, which is crucial to the journal’s editorial decision-making process and to the quality of the work that we publish.

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Jumadi

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Kota surakarta,

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