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PERUBAHAN MORFOLOGI SUNGAI CODE AKIBAT ALIRAN LAHAR PASCA ERUPSI GUNUNGAPI MERAPI TAHUN 2010 Solikha, Dian Eva; Marfai, Muh Aris
Jurnal Bumi Indonesia Volume 1, Nomor 3, Tahun 2012
Publisher : Fakultas Geografi UGM

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Abstract

Aliran lahar sebagai bahaya sekunder pasca erupsi Gunungapi Merapi tahun 2010 masihmengancam Sungai Code. Morfologi Sungai Code akan mengalami perubahan seiring denganterjangan aliran lahar yang melewatinya. Tujuan dari penelitian ini adalah mengkaji perubahanmorfologi Sungai Code yang terjadi pasca Erupsi Gunungapi Merapi dan dampak perubahannyabagi lingkungan fisik sekitar sungai. Penelitian ini menggunakan data titik ketinggian dasar alursungai tahun 2002 yang diperoleh dari Balai Pengairan Provinsi DIY dan data titik ketinggian dasarsungai tahun 2011 yang diperoleh dari pengukuran lapangan. Teknik analisis menggunakan analisisspasial, deskriptif dan komparatif. Perubahan profil morfologi Sungai Code antara lain adanyakenaikan dasar sungai berkisar 1 hingga 5 meter. Perubahan gradien sungai tahun 2002 sampaitahun 2011 pada tahun 2002 sebesar 0,68 % dan pada tahun 2011 sebesar 0,52%.Kata kunci: morfologi sungai, aliran lahar, perubahan, Sungai Code, Merapi
PEMODELAN SPASIAL BAHAYA BANJIR ROB BERDASARKAN SKENARIO PERUBAHAN IKLIM DAN DAMPAKNYA DI PESISIR PEKALONGAN Marfai, Muh Aris
Bumi Lestari Journal of Environment Vol 13, No 2
Publisher : Udayana University

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Abstract

AbstractTidal flood is predicted to be more severe in the future because of sea level rise due toglobal warming. Purposes of the study are: 1) identify spatial distribution of tidal floodhazard in Pekalongan coastal area; 2) identify environmental impacts of tidal flood inPekalongan coastal area; and 3) formulate coastal management based on spatialdistribution analysis and tidal flood impacts in Pekalongan. Flood analysis in coastalarea was conducted by flood hazard mapping using GIS (Geographic Information System).Flood hazard mapping was developed by integrating GIS operation with DEM (DigitalElevation Model), level of inundation and iteration process. Tidal flood inundation scenariowas generated based on highest tides and sea level rise scenario by IPCC 2007, level ofinundation reached up to 135 mm. Results of this study showed that settlement and irrigatedpaddy fields are the widest inundated area by tidal flood. Tidal flood provides seriousenvironmental impacts such as infrastructure damage, agriculture and aquaculture landdamage, and soil and water pollution. Infrastructure damages include road, settlementsand sanitation.
Geomorphological mapping of the San Lorenzo area Santarcangelo region Southern Italy Marfai, Muh Aris
Indonesian Journal of Geography Vol 37, No 2 (2005): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

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Abstract

The study area is located in the Santarcangelo region, Southern Italy. The area was developed from late Pliocene to middle Pleistocene in the southern part of the Apenines chain. It has also been defined as a piggy back basin filled with siliciclastic deposits, controlled by sedimentary tectonic activity.This article aims to identify the geological condition and generating geomorphological map for San Lorenzo area using aerial photo (scale 1:15000) and Panchromatic SPOT image (Scale 1:66000). Image interpretation was also done to identify morphological, structural and processes.The SantArcangelo region is composed of 4 cycles both marine and continental in origin, all deposited on different environments: The Caliandro, Agri, San Lorenzo and Sauro cycles. The study area consists of Sauro and San Lorenzo Cycle. Sauro Cycle is Comprises of three heterotrophic units deposited in sintectonic discordance over the Agri cycle. San Lorenzo Cycle lying in unconformity over the precedent cycles is consisting of three units, namely conglomerates on the base part as well as on the top part of the sequence, and silty clays in the intermediate part. They form a syncline structure which ax has a NW-SE direction. The main structural features are represented by the San Lorenzo syncline and the Alianello fault. The San Lorenzo area has three principal origins: alluvial, denudation, and structural. Due to the geological-tectonic complexity, the structural landform is normally found as structural denudational landform. San Lorenzo area comprises of 41 landform units, namely 3 units of alluvial landforni, 26 units of denudational landform and 11 units of structural denudational landform.
Qualitative Analysis Of The San Lorenzo Landslide In The Sant Arcangelo Region Southern Italy Marfai, Muh Aris; Guarin, Graciela Peters; Viera Cepero, Fransisco De La Caridad
Indonesian Journal of Geography Vol 38, No 1 (2006): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

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Abstract

This study is applying qualitative analysis based on the multitemporal evidence for generating the expected-landslide hazard map. The study was carried out in San Lorenzo area, Sant Arcangelo, Southern Italy. The main objectives of this study are: 1) to identify and generate old-landslide map year 1976 and recent-landslide map year 2002, and 2) to generate the expected hazard map based on multitemporal evidence. Interpretation of the aerial photographs has been used to determine the type of landslide and landslide activity in 1976, and fieldwork has been done to check type, of landslide and to determine the landslide activity in 2002. The comparison between activity 1976 and 2002 have been done in order to generate the expected hazard map. Most of the active landslide in 1976 and 2002 are complex and rockfalls type and only small part are spread; slide and flow. Some active landslides in 1976 are still active in 2002 and even inactive landslides in 1976 become active in 2002 and leading to the extended high and moderate hazard area.
MODEL SIMULASI LUAPAN BANJIR SUNGAI CILIWUNG DI WILAYAH KAMPUNG MELAYU–BUKIT DURI JAKARTA, INDONESIA Yulianto, Fajar; Marfai, Muh Aris; Parwati, -; Suwarsono, -
Jurnal Penginderaan Jauh dan Pengolahan Data Citra Digital Vol 6, (2009)
Publisher : Indonesian National Institute of Aeronautics and Space (LAPAN)

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Abstract

Jakarta is the biggest city in Indonesia located in the north-western of Java Island and between 5º59’–6º00’S and 106º30’–107º00’E. The total area is approximately 661,52 km2, and the population is more than 9 million in 2008. The occurrence of many flood in Jakarta had caused loss in properties, environmental degradations, and warsen communities health. A spatial approach model is applied to understand the effects of flood to land use in the research area. Objectives of the research are : 1) to create the hazard assessment model and 2) to calculate the impact of flood to the land use area. The methods consist of neighbourhood operation application development in the form of raster pixel calculation, in this case are the Digital Elevation Model values, by using mathematic calculation formula to assign the inundated area. Land uses, either the inundated or others, are the result of imagery data interpretations. Results of the research show that the simulation model represent the condition in the field when flood happened maximum scenario for inundation area of 2,00 m will affect to about 5,10 Ha (regular settlements); 80,82 Ha (irregular settlements); 2,22 Ha (open areas); 5,09 Ha (business areas); 40,39 Ha (office areas) and 18,83 (roads). Key words: Ciliwung flood, DEM, Iteration spatial model, GIS, Remote sensing
Typology, Dynamics, and Potential Disaster in The Coastal Area District Karst Gunungkidul Marfai, Muh Aris; Cahyadi, Ahmad; Anggraini, Dini Feti
Forum Geografi Vol 27, No 2 (2013): December 2013
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

This study aims to determine the typology, dynamics and potential disasters  in the coastal area of Gunungkidul, Yogyakarta Special Province. The results showed that the typology formed in the coastal region is structurally shaped karst Gunungkidul coast, Wave Erotion Coast, marine deposition coast, coast erosion land, coast and sub-aerial deposition of man-made coastal typology. Coastal dynamics that occur in karst  Gunungkidul coastal areas affected by dominant geodinamic processes, hydrodynamic and antropodinamic. There are several potential disaster in the karst Gunungkidul coastal region, namely tsunami, rip currents, abrasion, and waves reflection.
Kajian Transportasi Sungai Untuk Menghidupkan Kawasan Tepian Sungai Kahayan Kota Palangkaraya Hamidah, Noor; Rijanta, R; Setiawan, Bakti; Marfai, Muh Aris
TATALOKA Vol 16, No 1 (2014): Volume 16 Number 1, February 2014
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/tataloka.16.1.1-17

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River is a first transportation for connection city to village and central for economic community. Nowadays, land transportation is a trend  for connection city to village. River transportation have been not priority, due to land transportation more easy to access, low cost and faster rather than river transportation. River have been not priority for infrastructure and river is a backward. River is facing serious problems such as physical and environmental problem. River are still occupy for lower income people as a reason house can built by themselves and close to work location with a location in green belt area. Thispaper try to arguehow is a problem in  river transportation. The location of this research is Kahayan River, Palangkaraya City. This research aim is to reveal of potential of river transportation and unique of moda transportation will be revitalize of Kahayan riverside area of Palangkaraya City, Central Kalimantan.River is a first transportation for connection city to village and central for economic community. Nowadays, land transportation is a trend  for connection city to village. River transportation have been not priority, due to land transportation more easy to access, low cost and faster rather than river transportation. River have been not priority for infrastructure and river is a backward. River is facing serious problems such as physical and environmental problem. River are still occupy for lower income people as a reason house can built by themselves and close to work location with a location in green belt area. Thispaper try to arguehow is a problem in  river transportation. The location of this research is Kahayan River, Palangkaraya City. This research aim is to reveal of potential of river transportation and unique of moda transportation will be revitalize of Kahayan riverside area of Palangkaraya City, Central Kalimantan.
Kajian Klasifikasi Berbasis Obyek untuk Pemetaan Bangunan yang Berisiko Gempabumi di Bantul, Daerah Istimewa Yogyakarta Ristiyono, Lewi; Danoedoro, Projo; Marfai, Muh Aris
Majalah Geografi Indonesia Vol 30, No 1 (2016): Maret 2016
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/mgi.15624

Abstract

Bencana gempabumi mengakibatkan kerusakan bangunan dan infrastruktur. Oleh karena itu perlu adanya pemetaan bangunan dan infrastruktur yang menjadi elemen berisiko gempabumi. Dikarenakan daerah yang terdampak gempabumi di indonesia sangatlah luas maka pemetaan bangunan dan infrastruktur memerlukan teknologi penginderaan jauh. Teknologi penginderaan jauh dengan klasifikasi penggunaan lahan mampu memetakan bangunan dan infrastruktur lebih efisien. Klasifikasi penggunaan lahan dengan pendekatan berbasis piksel memiliki kelemahan yaitu mengabaikan aspek spasial, munculnya “salt and papper” dan kurang menunjukan otomatis ketika diintegrasikan dengan SIG. Kelemahan klasifikasi berbasis piksel tersebut dilengkapi pada klasifikasi berbasis objek. Penelitian ini bertujuan Penelitian ini bertujuan mengkaji kemampuan klasifikasi berbasis objek dengan menggunakan citra ALOS pansharpening dalam memetakan bangunan dan infrastruktur yang berisiko gempabumi. Metode yang digunakan dalam klasifikasi berbasis objek dengan klasifikasi hierarkis rule-based dengan segmentasi multiresolusi. Metode ini memanfaatkan algoritma hierarchical classification dan logika fuzzy yang disusun dalam rule-set ditiap kelas penggunaan lahan. Logika fuzzy digunakan untuk menentukan nilai keanggotaan fitur-fitur objek yang digunakan dalam identifikasi objek dalam citra. Fitur-fitur objek yang digunakan adalah gabungan dari aspek spektral dan tekstur atau GLCM. Nilai fitur-fitur objek diekstrak dari sempel area berdasarkan segmentasi multiresolusi dengan citra multispektral AVNIR-2 pansharpening. Selanjutnya hasil klasifikasi penggunaan lahan diseleksi subkelas area terbangunan dimanfaatkan untuk mengetahui distribusi spasial bangunan yang berisiko gempabumi. Hasil dari klasifikasi menunjukan tingkat akurasi yang rendah dimana akurasi keseluruhan yang dihasilkan adalah 65.4% dan akurasi klasifikasi untuk subkelas area terbangun juga rendah. Hal ini disebabkan oleh kurang efektiknya klasifikasi hierarkis pada daerah penggunaan lahan dengan heterogenitas yang tinggi, distorsi citra AVNIR-2 pansharpening sebagai sumber data. Dan penggunaan 1 skala segmentasi untuk semua kelas di level 4 klasifikasi mempengaruhi rendahnya akurasi klasifikasi berbasis objek. 
Potensi Wisata dan Preferensi Visual Lanskap Wisatawan untuk Pengembangan Pariwisata Pesisir (Kasus : Pantai Angin Mamiri dan Tanjung Bayang Kota Makassar) Fadlin, Feri; Marfai, Muh Aris
Majalah Geografi Indonesia Vol 30, No 1 (2016): Maret 2016
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/mgi.15613

Abstract

Penelitian ini bertujuan untuk (1) menganalisis potensi dan kondisi sumberdaya untuk kesesuaian dan daya dukung kawasan wisata pesisir, (2) menganalisis kondisi sosial ekonomi masyarakat pesisir kawasan wisata, (3) menganalisis preferensi visual lanskap wisatawan terhadap estetika kawasan wisata dan (4) menyusun strategi pengembangan kawasan Pantai Angin Mamiri dan Tanjung Bayang Kota Makassar. Penelitian ini menggunakan metode survei dan studi literatur untuk mengumpulkan data primer dan data sekunder. Teknik analisis data menggunakan pendekatan kuantitatif maupun kualitatif. Pendekatan kuantitatif digunakan dalam analisis Indeks Kesesuaian Wisata, Daya Dukung Kawasan, Jejak Ekologis Wisatawan dan Estimasi Estetika Lanskap. Pendekatan kualitatif digunakan dalam analisis kondisi sosial ekonomi masyarakat dan analisis SWOT untuk menyusun strategi pengembangan kawasan wisata. Hasil penelitian menunjukkan bahwa indeks kesesuaian wisata pesisir pada Pantai Angin Mamiri termasuk kategori sangat sesuai (S1) dan Pantai Tanjung Bayang kategori sesuai (S2). Nilai daya dukung kawasan masih potensial dikembangkan. Jejak ekologis wisatawan menunjukkan nilai tertinggi pada komponen makanan, kemudian transportasi, akomodasi dan sampah. Tingkat pendidikan dan penghasilan masyarakat pelaku wisata masih rendah dan sebagian besar merupakan penduduk sekitar. Preferensi Visual Lanskap wisatawan menunjukkan nilai yang rendah hingga sedang pada lanskap dengan komponen non alami dan alami serta tinggi pada tutupan lahan dengan komponen alami. Rekomendasi strategi pengembangan obyek wisata yaitu pemanfaatan potensi sumberdaya alam dan lingkungan wisata secara optimal, dan mengoptimalkan kerjasama antara Lembaga Pemberdayaan Masyarakat (LPM) Tanjung Merdeka dan Pemerintah dalam pengelolaan limbah, peningkatan aksesibilitas serta pembangunan sarana prasarana wisata dengan tetap memperhatikan kelestarian dan kebersihan lingkungan pantai. 
Analisis Dampak Intrusi Air Laut Terhadap Airtanah di Pulau Koral Pramuka, DKI Jakarta Cahyadi, Ahmad; Adji, Tjahyo Nugroho; Marfai, Muh Aris; Noviandaru, Sembodo; Agniy, Romza Fauzan
Majalah Geografi Indonesia Vol 31, No 2 (2017): September 2017
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/mgi.23725

Abstract

Abstrak Pulau Koral Pramuka merupakan salah satu pulau yang memiliki fungsi strategis sebagai Ibukota Kabupaten Kepulauan Seribu, DKI Jakarta. Pembangunan yang terus berlangsung untuk mendukung fungsi sebagai ibukota sekaligus sebagai tujuan wisata menjadikan pertumbuhan penduduk tinggi dan kebutuhan akan sumberdaya air terus meningkat. Kondisi demikian dapat menyebabkan ancaman intrusi air laut menjadi semakin tinggi karena jumlah pengambilan airtanah akan semakin bertambah. Penelitian ini bertujuan untuk mengetahui dampak intrusi air laut terhadap airtanah di Pulau Koral Pramuka. Metode yang digunakan adalah analisis daya hantar listik (DHL) airtanah serta perbandingan ion klorida dan ion karbonat dalam airtanah. Data yang digunakan dalam penelitian ini adalah nilai DHL, kandungan ion klorida dan bikarbonat yang diambil dari sampel airtanah. Sampel diambil secara sistematis berdasarkan grid berukuran 100 meter x 150 meter. Total sampel airtanah adalah sejumlah 23 sampel. Hasil kajian menunjukkan bahwa 15 sampel airtanah menunjukkan bahwa intrusi telah berpengaruh cukup besar terhadap airtanah, sedangkan 8 sampel menunjukkan bahwa intrusi telah berpengaruh besar terhadap airtanah di Pulau Koral Pramuka.AbstractPramuka Cay, one of the islands in Kepulauan Seribu Regency, Jakarta, has a strategic role as the capital district. The constant development, which aims to support the functions as a capital district and a tourist destination, persistently increases population growth and, at the same time, demand for water resource. This condition may intensify the threats of seawater intrusion as it induces a higher groundwater withdrawal. This research aimed to identify the impact of seawater intrusion on groundwater in Pramuka Cay using electrical conductivity (EC) analysis and comparison analysis of the chloride and bicarbonate ions in the groundwater. The research data, including EC and the concentration of chloride and bicarbonate ions, were obtained from groundwater samples. The 23 samples were selected systematically from 100x150 m2 grids. The analysis of 15 samples found a rather significant impact of seawater intrusion on groundwater, whereas the test results on the remaining 8 samples showed that seawater intrusion had affected the groundwater in Pramuka Cay considerably.