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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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Spatial Diffusion of Leather Industries (Case Study at Magetan District) Dilahur Dilahur
Forum Geografi Vol 16, No 2 (2002)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v16i2.609

Abstract

After the rise and the fall of the tides and the change of the activities as the phenomena which happen in the daily life of sociaety, the hange of spacing or distributionn of industrial businesses becomes one of the new phenomena. The objective of this research is to know the process of the diffusion from leather industry in Magetan Subdistrict. This research uses secondary data analysis and direct observation. The result of this research shows that the change (the rise and fall of the tides) in leather industry has producted the movement of distribution or spacing in which the center of the main production is declined and the new center may arise. In this movement, it seems that the existence of the specification on types of activity, like having similar leather, shoescraft, beltcraft, and sendalcraft become the serious phenomena. This kind of the change and its development is signed by the change of position from becoming employee to be new employer, having some employees that may become the employers at any time and so forth. The style of the diffusion which happen is the style of mixing diffusion in which the business on leather industry becomes wider reaching around the village while the original village (Kauman) is still as the center of industry, although it has so limited activities because the business is always declined.
Kondisi Air Tanah di Daerah Perkotaan: Problema Antara Kuantitas dan Kualitas Air Alif Noor Anna
Forum Geografi Vol 7, No 1 (1993): July 1993
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v7i1.4797

Abstract

Daerah perkotaan yang merupakan pusat berbagai kegiatan ekonomi, jasa dan industri mejadikan kota sebagai pusat konsentrasi penduduk. Dalam pelaksanaannya selalu membutuhkan air. Umumnya masih banyak yang menggunakan air tanah, karena mempunyai banyak kelebihan baik segi ekonomi maupun potensinya (kualitas dan kuantitas). Pada saat ini sudah terjadi kecenderungan penggunaan air tanah yang kurang rasional. Terjadi ketimpangan antara ketersediaan dan penggunaannya, di samping telah terjadi efek kurang baik bahkan terjadi gejala pencemaran air tanah yang segera perlu mendapat perhatian. Gejala dari penggunaan yang kurang rasional adalah penurunan permukaan tanah dan instrusi air laut pada daerah kota yang berada di pantai, sedangkan kondisi kualitas air pun tercemar baik dari sifat fisis, khemis maupun bakteriologis.
Empirical Model for Calculating the Peak Discharge and The Time Delay of Flood of Synthetic Hydrograph Unit in Sumbawa S Soewarno; Kustaman Kustaman
Forum Geografi Vol 13, No 1 (1999)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v13i1.463

Abstract

This research was carried out in Sumbawa island, it aims to determine: 1) the value of Snyder’s CT and CP coefficient of the synthetic unit hydrograph; 2) the empirical model to estimate of CT and CP coefficient; 3) the empirical model to estimate the peak flow and time lag of synthetic unit hydrograph. Based on rainfall – runoff data, Snyder’s T and CP coefficient of the synthetic unit hydrograph can be derived by syntheti means. The empirical model of CT and CP coefficient can be estimated by using the stepwise method of the multiple regression models. Measurable characteristics of watershed, including watershed area (LDP), length of main river (PSU), slope of watershed (KIM), forest area (LHT), sawah area (LSW), tegal area (LTG), grass area (LRUM), and mean annual rainfall (CHJ) are used to estimate these model. The most appropriate model is selected from a statistical test. Result of analysis show that the model can be used to estimate of Snyder’s CT and CP coefficient. These model can be used to make the empirical model to estimate the peak flow and time lag of synthetic unit hydrograph of ungauged watershed in Sumbawa island.
Land Subsidence Analysis of Reclaimed Land using Time-Lapse Microgravity Anomaly in Manado, Indonesia Sandy Nur Eko Wibowo; Gybert E. Mamuaya; Rignolda Djamaluddin
Forum Geografi Vol 32, No 1 (2018): July 2018
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v32i1.5882

Abstract

Coastal area land reclamation is a policy with various benefits, including its potential to increase economic growth. However, reclamation also potentially has adverse impacts on the environment, including increasing pressure on biodiversity, natural resources and natural ecosystems, and the most common problem is land subsidence. This study uses time-lapse microgravity anomaly to ascertain the distribution of gravity and vertical gradient anomaly in order to map the subsidence characteristics occurring in the Manado reclamation area. From the research that has been previously conducted, the positive gravity anomaly is spread around Megamall-Multimart to the north of Monaco Bay and on the southern side of Manado Town Square (Mantos). Positive anomaly values range from 3 to 29.7 μGal. The negative anomaly values are scattered around the Mantos and Megamas separating bridge and at some points around the Whiz Prime Hotel, Menora Church and towards the Pohon Kasih Megamas area. The reclaimed areas generally experience subsidence accompanied by a reduction in groundwater mass (Megamall and Mantos) due to the use of the groundwater by the community in these areas. Uplifts also occur at some points in the reclamation area of Megamas as a result of the occurrence of land subsidence. Longer-term research is needed to determine whether there is an increase in the rate of land subsidence in the Manado reclamation area. Over a longer period of time it can also be established whether there are other factors which affect land subsidence. Other geodetic methods to monitor subsidence, such as levelling, InSAR and GPS survey, which have been conducted in other locations, are also needed to obtain more detailed information about the land subsidence in this area.
Rural Settlement Development and Environment Carrying Capacity Changes in Progo River Basin Su Ritohardoyo; P Priyono
Forum Geografi Vol 19, No 2 (2005): December 2005
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v19i2.4843

Abstract

Generally the broader rural settlement the heavier population pressure on agricultural land. It indicates that carrying capacity of the rural environment threatened lower. The spatial distribution of the threat in a river basin is quite important as one of the river basin management inputs. Therefore, this article aims at exposing result of research about influence rural population growth and rural settlement land changes to environment carrying capacity. This research was carried out in the rural area in Progo river basin consists 56 sub districts (34 sub districts part of Jawa Tengah Province, and 22 sub districts part of Yogyakarta Special Region). The whole sub districts are such as unit analysis, and research method is based on secondary data analysis. Several data consist Districts Region in Figure 1997 and 2003 (Temanggung, Magelang, Kulon Progo, Sleman and Bantul) such as secondary data analysis. Data analysis employs of frequency and cross tabulation, statistics of regression and test. Result of the research shows that population growth of the rural areas in Progo river basin are about 0.72% annum; or the household growth about 3.15% annum as long as five years (1996-2003). Spatial distribution of the population growth in the upper part of the Progo river basin is higher than in the middle and lower part of the basin. The number proportion of farmer in every sub district area in this river basin have increased from 69.95% in 1997 to 70.81% in the year of 2003. It means that work opportunities broadening are still sluggish. However, the number proportion of farmers in the upper part of the Progo river basin is lower than in the middle and lower part of the basin. The rates of settlement land areas changes (0.32 ha/annum) as long as five years (1997-2003) is not as fast as the rates of agricultural land areas changes (0.47 ha/annum). Spatial land settlement areas changes in the lower (6.1 ha/annum) and middle parts (2.4 ha/annum) faster than upper part of the river basin, as a consequence the different accessibility to urban area. Environment carrying capacity of every sub district areas in this river basin becomes lower as long as five years (1997-2003). In the upper part of the basin however, the index of environment carrying data (0.13) higher than in the lower part of this river basin (0.09), especially in the several sub districts surrounding urban area. The environment carrying capacity of Progo river basin depends on the land settlement and the growth of household number changes. However, influence of the land settlement area changes is stronger than the growth of household number changes to the environment carrying capacity. This result of research shows that spatial and temporal characteristics of settlement environment degradation in the lower and middle parts wider than in the upper part of Progo river basin in the coming twenty five of years.
The Role of Aeolin in The Formation of Earth Surface Configuration and The Influencing Factor Alif Noor Anna
Forum Geografi Vol 11, No 2 (1997)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v11i2.486

Abstract

Configuration of the earth surface is molded by the interaction of endogenous and exogenous forces. The outcome of the interaction usually has the shape of special charracter. Configuration charracter is then applied to grouping of more simple form called landform. It so happens that one of the landform function is to make geomorphology research more easier. Que of the earth surface configuration is molded by wind force the result of this activity is called the landform which is originally molded by wind process. There are two folds function of wind process i.l: erosion (= coracoid process and deposifronal force). Coracoid process usually takes place on vertical as well as horizontal plane. Coracoid on vertical plane will have the shape of yardang, while on horizontal plane has the shape of pillars, needless, and zenguen. It so happens that depositional wind will shape ripples, sanddunes, and loess.
A Comparative Study of various Indices for extraction urban impervious surface of Landsat 8 OLI Iswari Nur Hidayati; R Suharyadi
Forum Geografi Vol 33, No 2 (2019): December 2019
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v33i2.9179

Abstract

Impervious surface is one of the major land cover types of urban and suburban environment. Conversion of rural landscapes and vegetation area to urban and suburban land use is directly related to the increase of the impervious surface area. The impervious surface expansion is straight-lined with decreasing green spaces in urban areas. Impervious surface is one of indicator for detecting urban heat islands. This study compares various indices for mapping impervious surfaces using Landsat 8 OLI imagery by optimizing the different spectral characteristics of Landsat 8 OLI imagery. The research objectives are (1) to apply various indices for impervious surface mapping and (2) identifies impervious surfaces in urban areas based on multiple indices and provide recommendations and find the best index for mapping impervious surface in urban areas. In addition to utilizing the index, land use supervised classification method, maximum likelihood classification used for extracting built-up, and non-built-up areas. Accuracy assessment of this research used field data collection as primary data for calculating kappa coefficient, producer accuracy, and user accuracy. The study can also be extended to find the land surface temperature and correlate the impervious surface extraction data with urban heat islands.
Analysis Physical Characteristics of Land for Estimated Runoff Coefficient as Flood Control Effort in Comal Watershed, Central Java Arina Miardini; Pranatasari Dyah Susanti
Forum Geografi Vol 30, No 1 (2016): July 2016
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v30i1.1131

Abstract

Watershed conditions in Indonesia have been degraded over time, which is marked by increasing area of critical land. The vast area of critical land was evidenced to be a serious threat for watershed carrying capacity which eventually affected the hydrology imbalance in the watershed area. One among watershed with degraded lands which seriously requires priority handling is Comal watershed. The purpose of this study is to identify the physical characteristics of Comal watershed which have significant influence in determining the runoff and calculating the runoff coefficient by taking into account the parameters of watershed’s physical characteristics. The method used in this analysis is Cook method, which is done through the estimation of runoff coefficient by evaluating the parameters of slope, infiltration, vegetation cover, and drainage density.  The unit of analysis in this study is land mapping unit. Results of the four parameters are classified and the classification is done so that the scores of the runoff coefficient are figured out, while the peak discharge determination is performed by using the Rational method. The analysis showed that runoff coefficient of Comal watershed is 61.63%, which can be categorized as high. The runoff coefficients and peak discharge calculations of each sub watershed, respectively, Comal Hilir of 52.65% with peak discharge 505.68 m3/sec, Genteng of 65.04% with peak discharge 542.44 m3/sec, Lomeneng of 64.00% with peak discharge 194.23 m3/sec, Srengseng of 64.10% with peak discharge 270.46 m3/sec, and Wakung Hulu of 62.34% with peak discharge 686.64 m3/ sec. The most influential runoff coefficient factors are, respectively, infiltration rate, slope, vegetation cover, and drainage density. Flood control priority in Comal watershed should be preoccupied to increase the infiltration rate through a combination of three conservation techniques of mechanical, vegetative, and biology.
Analisis Kesesuaian Lahan Wilayah Pesisir Kota Bengkulu melalui Perancangan Model Spasial dan Sistem Informasi Geografis (SIG) Yulian Fauzi; Boko Susilo; Zulfia Memi Mayasari
Forum Geografi Vol 23, No 2 (2009): December 2009
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v23i2.5002

Abstract

This research is aimed to alocate land management and use coastal and ocean area Sub-Province base on digital through Geographical Information System (GIS). This research was done in the coastal area Kota Bengkulu, through spatial alocate analysis and land suitability analysis for brackish water fish ponds, maritime tourism and conservation areas. Approach used in this research is spatial analysis to parameter/variable and land suitability criteria consist of element abiotik, biotik, culture, and spatial use (RTRW). Land suitability analysis is done by using SIG through overlay technique. Result of research indicate that from 7 sub district of coastal area of exist in Kota Bengkulu, land suitability (S1) for brackish water fish ponds are found in sub-district Muara Bangkahulu and Kampung Melayu. Land suitability (S1) for the maritime tourism are found in sub-district Teluk Segara and Ratu Samban, while Land suitability (S1) for conservation area of are found in sub-district Kampung Melayu.
Sattelite Data for Fish Concentration Identification in Marine Sugiharto Budi Santoso
Forum Geografi Vol 10, No 1 (1996)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v10i1.518

Abstract

Knowledge shortcoming in fish-living management as well as marine biotic living cycle and fishermen’s fault technology capability causes their inadequate skill to catch fishes in large scale. To increase the result of caught fishes, it necessary to give the fishermen suffice technology of when and where the shool of fishes site in the sea. Recognizing the school of fishes in the sea is guided with the satellite data of NOAA, GOES, ADEOS as well as Landsat and the others which are able to point the site of where fishes are schooling. Besides, by making use of GPS satellite the position of fishermen’s ship then could be detected so that the movement ould be easily observed.

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