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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
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Lahar at Kali Konto after the 2014 Eruption of Kelud Volcano, East Java: Impacts and Risk Dibyosaputro, Suprapto; Dipayana, Gilang Arya; Nugraha, Henky; Pratiwi, Kartika; Valeda, Hogy Prima
Forum Geografi Vol 29, No 1 (2015): Forum Geografi
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Abstract

Five days after the Kelud Volcano eruption of 13 February 2014, lahar occurred in several channels of the Volcano. Rainfall with intensity of 26 mm/hour mobilized pyroclastic material from the upper slopes of Kelud Volcano down the channel during 3.5 hour. Using this eruption as a case study, the aims of this paper are (1) to study the geomorphic impact of lahars and (2) to study future hazards and risks due to the potential of lahar source material and lahar repose area. To reach these two goals, we use both primary and secondary data. The primary data comprises an integration of remote sensing, GIS approach, and fieldwork control, in order to investigate the geomorphic impacts of lahars. Secondary data were collected through interviews and statistical approach in villages, in order to determine their perception to the risk of lahar. Morphogenic processes such as riverbank erosion, channel-widening and riverbed downcutting took an important role in generating the impact of lahar in Kali Konto. The medial and distal areas were affected more largely affected than the proximal area. This major impacts have been river widening and buried crop field inside of the channel. This result allowed us to provide recommendation to population living along those areas at risk, in order to be prepared against the eventuality of potentially large and destructive lahars.
Urgensi Aspek-Aspek Sosial dalam Kajian Dampak Lingkungan Hardjono, Imam
Forum Geografi Vol 12, No 1 (1998)
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Abstract

Segala aktivitas masyarakat memiliki dampak positif dan negatif, dampak tersebut harus tidak menganggu keharmonisan hidup masyarakat. Aktivitas atau suatu usaha kegiatan selalu berubah-ubah dan sekaligus dihadapkan pada dinamika masyarakat yang merupakan aspek-aspek sosail. Padahal aspek-aspek sosial memiliki peran yang penting dalam kajian dampak lingkungan. Aspek-aspek sosial yang dikaji dalam analisa dampak lingkungan meliputi komponen-komponen yang terdiri dari variabel-variabel, seperti demografi, ekonomi, dan budaya. Variabel aspek-aspek sosial ini ternyata tidak kalah pentingnya dengan analisis dampak lingkungan dalam pengertian aspek fisik.
Land Ownership and Income Distribution of People in Ngimbakan and Mranggen Municipality Polokarto Sub-District, Sukoharjo Astuti, Wahyuni Apri
Forum Geografi Vol 10, No 1 (1996)
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Abstract

The research is conducted in Ngombakan and Mrangeen, two villagein district of polokarto, Sukoharjo regency. The two villages employe two different irrigation systems, one technical and the other non-technical. The study aims at two major objectives, namely: 1) the relation between the width of agricultural land holding and the income distribution of the different irrigation systems employed in the two villages; and 2) yhe influence of land holding having different irrigation systems on the agricultural income, non agricultural income as well as the household income. The sample include 225 respondents selected in proportion. They consist of 75 respondents that come from the village employing the technial irrigation. And 150 respondents from that employing the non-technical irrigation. The samples are taken in random. The analysis is conducted by means of cross-table analysis, frequency distribution, and product moment correlation.The result of the reasearch show that 1) there is small rate of land holding in two village; 2) there is a great deal of inequality  of land holding in the two villages in which it is higher in Mranggen than that in Ngombakan (Gini index in Mranggen is 0.668, where as that in Ngombakan is 0.602); 3) there is a considerable inequality of agricultural income in which Mranggen is higher than Ngombakan; 4) there is a slight differene of household income in two villages; 5) there is positive correlation between the widht of land holding and the agricultural income, non agricultural income as well as the household income in Mranggen; 6) there is a positive correlation between the widht of land holding and agricultural income but there is no significant correlation between the widht of land holding and the non agricultural income as well as that of the household. The study was found out that the non-agricultural sector is playing an inreasingly important role in the distribution of household income. The inequality of agricultural income in the villages is considerably high but the inequality of the total income as well as that of the income per capita is relatively low. The contribution of the agricultural sector to the total income is lower than that of the non-agricultural. There is a difference of poverty level in which respondents employing the tehnical irrigation have a lower degree of poverty than those employing the non-technical irrigation.
Aerial Photo Utilization in Estimating Suspended Sediment in the Wuryantoro Watershed, Wonogiri Santoso, Sugiharto Budi; Priyono, Kuswaji Dwi; Anna, Alif Noor
Forum Geografi Vol 17, No 2 (2003)
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Abstract

Suspended sediment load flowing out from a watershed is normally predicated by analysis os suspended sediment of water sample, and the volume of suspended sediment be calculated based on sediment concentration and river discharge. Such field measurements need a lot of field data and they are time consuming. Another method for prediction of suspended sediment by using remote sensing imagery data and recorded rainfall data. The objective of this research is to 1) examine the capability of remote sensing technique to obtain the parameters of the physical data of land in the prediction of suspended sediment; 2) examine the accuracy of the model for prediction suspended sediment. This research is carried out in Wuryantoro watershed, Wonogiri. The main data to obtain the parameters of the physical data of land is infrared aerial photograph on scale 1 : 10.000. the method that used in this research is interpretation of remote sensing imagery data, combined with rainfall data. The result show that the accuracy of landuse is 88.5%, the accuracy of slope is 87.67%. the accuracy of the prediction of suspended sediment by model A3 87.07%, model C1 86.63%, model C2 90.57%, model A8 84.13%, model A9 80.1%, and model C4 78.6%.
Water Storage Index Estimation using Geographic Information System Wuryanta, Agus; Murtiono, Ugro Hari
Forum Geografi Vol 28, No 1 (2014)
Publisher : Universitas Muhammadiyah Surakarta

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The study aims to estimate water storage index (IPA) of six sub watersheds (Panjang, Rengas, Legi, Galeh, Parat, and Sraten) in the cachment area of Rawapening lake by using Geographic Information System. Water storage index can be calculated from average discharge (m3) devided by water requirement (m3) for each land cover/land use. Landuse information is obtained from Indonesian Topographic Map scale of 1:25.000 as updated by using SPOT image (2006), while surface water availability data was obtained from the ministry of public works. The results indicate that 1) IPA of Panjang Subwatershed was categorized as good condition with an index value of 1,49; 2)IPA of Rengas and Legi sub watersheds were categorized as moderate condition with index value 0,76 and 0,55; 3) IPA of Galeh, Parat, and Sraten sub watersheds was categorized as bad with index value of 0,3, 0,15, and 0,33, this watershed need to be improved especially an effective water resources plan, allocating and distributing of water according to priority establishment.
Land Potency for Dairy Cattle at East Slope of Merapi-Merbabu Volcano, Boyolali, Central Java Priyana, Yuli
Forum Geografi Vol 18, No 2 (2004)
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Abstract

Research about farm potency for the livestock of diary attle is held in east volcano side of Merapi – Merbabu Boyolali regeny. This famous area represent dairy attle livestock sentra in Boyolali regeny. From the holdness above emerging question why dairy cattle livestock expand at area. This research aim to study which area which are potential for the livestock of dairy cattle and also physical fator what most having an effect to density of dairy cattle livestock, what is availability of water, mean temperature, height of place, accesibility. The methods use in the research is analysis of secondary data provided with survey. To know the condition of physical what most having an effect on density (availability of water, mean air temperature, height of place, accesibility) to use test of multiple regression. To know dairy cattle livestock farm potency joined with others compile map of availability of water, map of temperature, map of height of place, and map of accesibility.  The result of researh indicate that most having an effect to density to dairy cattle livestock press out accesibility. Potency farm area of the livestock of dairy cattle about of height 700 m of sea water level, around region sub district of Cepogo, Selo, and Musuk. Musuk, this area represent area having cold limate enough. Research area having density of highest dairy cattle livestock is district of Musuk.
Analysis of Groundwater Advance Decline in Surakarta City Cholil, Munawar
Forum Geografi Vol 12, No 2 (1998)
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Abstract

This research was intended to know the cause of a drawdown of artesian groundwater surface and analyze on exploiting its groundwater in Surakarta. The total amount of groundwater exploitation in Surakarta will be 69,206.4 m3  if it is compared the groundwater runoff capacity of unconfined aquifer as with 8,860.9 m3 a day and confined aquifer as 42,447.3 m3 a day. Thus, the total amount of groundwater runoff in Surakarta is 51,308.2 m3 a day. Groundwater exploitation has exceeded the capacity of groundwater runoff as 17,898.2 m3, so the reservoir of groundwater is going to reduce continually. Groundwater exploitation in the loation of the researh has caused a piezometric drawdown. In 1990, its piezometric was negative, it means that the position of the piezometric was under the surface of land, while in 1990  artesian well indicated that its piezometric was almost nearly positive. Thus, the piezometric drawdown average 9.4 m3. In the center of the ity, it happened the cone of depression at piezometric contour in 1990, so a piezometric drawdown that resulted from groundwater exploitation exceeding the runoff of groundwater was proved. As a result of groundwater exploitation excessively, it resulted in the inequilibrium of groundwater. This depession has been extending continually as a result of adding wells, so it result in a groundwater drawdown permanently, as happened in the location of the research.
Study of Settlement Pattern in Klaten District, Central Java Province Martono, Agus Dwi
Forum Geografi Vol 10, No 2 (1996)
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This study is aimed at studying spatial distribution patterns of settlement, inluding their variations and respective influencing facctors. The ultimated objetives to be ahieved are studying variation of dsitribution patterns of settlement, and the contribution of socio-economi facctors to the existing distribution patterns of settlement under varying topographic areas. The study is conducted in Klaten District, covering 401 villages in the district. A survey method is secondary data analysis. Data are analyzed statistically using T test, varians analysis, correlation, and multiple regresion. The research shows that there is no significant differences in distribution patterns of settlement between the Merapi volcanic slope, the lowland, and the hilly zone. Physical factors are not significantly influencing the distribution patterns of settlement in various topographic zone. A neglegible ifference in the index distribution pattern of settlement can be observed. Hilly zone of the district reveals an index of 0.959. lower than those in the volcanis slope (1.035) and in low land (1.058). distribution patterns of settlement in various topographi zone are ditermine by different sets of socio-economic variables. In the volcanic zone two variables i.e. population density and the portion of sawah area are strongly influencing the distribution patterns of settlement. In this zone population density contributes more than the sawh area. Where as in the low land areas housing density dictates the distribution patterns of settlement. Other variables such as population density, road density, and utilities are less significantly influencing settlement patterns in the low land areas. The same relation between settlement pattern and housing density is also obvious in the distribution patterns of settlement in this hill. In general distribution patterns of settlement in the district are ontrolled by housing density, population density and road density. The higher housing densities, the distribution of hamlets are more spread. The same relation applies to population density. The higher road density the more clustered is the distribution patterns of settleent can be observed in the fast growing areas, rather than the opposite. No differences in distribution patterns of settlement can be observed among development unit areas (SWP) in the district. 
Development of Basic Rusal Services: An Operational Approach Sutanto, Agus
Forum Geografi Vol 4, No 2 (1990)
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Abstract

Approach on the study of rural service development is often confused with general regional development study in which both development indicators are interchanged. However the two study are closely related and able to contribute one to another. A confusion also exist in the setting up of the concepts of social services, economic services, and infrastructures functions. As such, the study of service development should have a great care of the study implication in  which sectoral action planning should follow up. This article tries to present an operational approach on the rural service development with an ilustrative case study of Yogyakarta Special Region.
Landslide Zonation at the Budong-Budong Watershed, Central Mamuju District of West Sulawesi Province Paharuddin, Paharuddin; Ahmad, Asmita; Ansar, Muh.; Solle, Muchtar S
Forum Geografi Vol 28, No 2 (2014)
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The objectives of this study are as  follows: first, to investigate the contributing parameters induced land sliding in the Budong-Budong watershed, and second, to construct landslide susceptibility zonation map.  In this study, the analytical hierarchy process (AHP) based on Geographical Information System (GIS) methods was used to produce map of landslide susceptibility. In this study area, more than 50% of total area were classified high (H) to very high (VH)  susceptibility landslide zone.  Mean while, 12% of total area were classified as  moderate (M)  and remaining were classified as  low (L) to very low (VL) susceptibility landslide zone. Almost area of Budong-Budong Wetershed were classified as VH and H susceptibility landslide zone underlying by Talaya (Tmtv), Lamasi (Toml) and Latimojong (Kls) Formation on the steep slope land.

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