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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

Show Abstract | Download Original | Original Source | Check in Google Scholar

This study aims to determine the typology, dynamics and potential disastersÂ 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 karstÂ 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.

MODEL SPASIAL DAMPAK PENURUNAN MUKA TANAH DAN GENANGAN PASANG AIR LAUT (ROB) DI WILAYAH PESISIR JAKARTA Yulianto, Fajar; Marfai, Muh Aris
GEOMATIKA Vol 17, No 1 (2011)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

Tidal inundation (rob) distribution and calculation of area impact on land use has been conducted by using prediction of land subsidence spatial model. ModelÂ is generated by using moving average inverse distance interpolation in high point map to achieved Digital Elevation Model (DEM) prediction in 2010, 2015 and 2020. Rob inundation is made using iteration function of neighborhood operation in data of DEM raster. The result of accuracy and reliability of the model are 51% and 73%, respectively. The impact of rob inundation is based on overlay rob inundation model of land use from interpretation image SPOT-4, that shows trend to increase year to year.Key word: Land subsidence, tidal inundation, iteration neighborhood operation, GIS, and remote sensingÂ Â ABSTRAK Telah dilakukan pemodelan spasial prediksi land subsidence, distribusi genangan pasang air laut (rob) dan perhitungan luas dampak rob terhadap penggunaan lahan. Model dibuat menggunakan interpolasi moving average inverse distance pada data titik tinggi yang diformulasikan untuk mendapatkan prediksi Digital Elevation Model (DEM) pada tahun 2010, 2015 dan 2020. Model genangan rob dibuat menggunakan fungsi iterasi operasi neighborhood yang diterapkan pada data raster DEM. Hasil analisis dari akurasi dan reliabilitas masing-masing sebesar 51% dan 73%. Luas dampak genangan rob diperhitungkan berdasarkan overlay model genangan rob terhadap penggunaan lahan hasil interpretasi Citra SPOT-4, yang menunjukkan kecenderungan semakin meningkat dari tahun ke tahun.Â Â Â Â Â Kata Kunci: Land subsidence, genangan pasang air lautÂ (rob), iterasi operasi neighborhood, SIG dan penginderaan jauh

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v27i2.2373

This study aims to determine the typology, dynamics and potential disastersÂ 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 karstÂ 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.

RESPONS PANTAI TERHADAP GELOMBANG PASANG AKIBAT SIKLON DI DAERAH ISTIMEWA YOGYAKARTA Malawani, Mukhamad Ngainul; Marfai, Muh Aris; Hadmoko, Danang Sri; Putra, Mega Dharma; Setyawan, Nicky; Prakosa, Sigit Hadi; Mardiyanto, Mardiyanto; Widagdo, Brianardi; Yoga, Aldhila Gusta H.; Sasongko, Mohamad Haviz Damar; Handayani, Tiara
MAJALAH ILMIAH GLOBE Vol 21, No 2 (2019)
Publisher : Badan Informasi Geospasial

Penelitian ini bertujuan untuk mengkaji respons wilayah pesisir akibat kenaikan muka air laut atau gelombang pasang. Gelombang pasang dapat diakibatkan oleh berbagai faktor. Analisis pada penelitian ini hanya mencakup gelombang pasang yang diakibatkan oleh fenomena siklon. Secara alami wilayah pesisir dapat memiliki perbedaan dalam merespons kejadian gelombang pasang. Perbedaan respons tersebut dapat dipengaruhi oleh kondisi fisik pesisir seperti tipe pesisir, lebar gisik, dan kemiringan gisik. Lokasi sampel dalam penelitian ini ada di sembilan pantai di DIY. Pantai tersebut antara lain adalah Pantai Pasir Medit (bermangrove), Pantai Glagah (berlaguna), Pantai Trisik, Pantai Baru, Pantai Goa Cemara, Pantai Depok (lurus-landai), Pantai Baron (berteluk), Pantai Somandeng (bertebing), dan Pantai Pulang Syawal (ber-platform). Observasi dilakukan secara terstruktur mencakup pengukuran tinggi dan jangkauan genangan, pendataan kerusakan fasilitas (termasuk jenis kerusakan dan estimasi kehilangan dalam nilai rupiah). Observasi ini dilakukan hari ke-1 dan ke-2 setelah kejadian siklon tanggal 19 Juli 2018. Hasil dari penelitian ini menunjukkan bahwa berbagai jenis tipe pesisir yang ada di DIY memiliki respons yang berbeda-beda. Dengan membuat matriks dapat diketahui bahwa setiap tipe pesisir mempunyai dampak dan kerawanan yang berbeda-beda dari kejadian gelombang pasang. Matriks ini diharapkan dapat digunakan untuk penelitian selanjutnya guna menilai respons wilayah pesisir terhadap gelombang pasang dan dapat digunakan untuk kegiatan mitigasi bencana di wilayah pesisir.

Analisis Ekologis Meiofauna Sebagai Bioindikator Di Pesisir Pantai Losari, Makassar Yusal, Muh Sri; Marfai, Muh Aris; Hadisusanto, Suwarno; Khakhim, Nurul
bionature Vol 19, No 1 (2018): April
Publisher : Fakultas MIPA UNM

Abstract. Â The research aims to analyze ecological value of meiofauna as bioindicator in Losari Coast, Makassar. The total meiofauna abundance was 66791 indv/m2, consisted of 12 phylum and 91 species/genus. The stations located at the mouth of the Jeneberang River, Tanjung Merdeka, and the Tallo RiverÂ are research sites with high levels of abundance, due to the presence of organic contaminants produced by surrounding anthropogenic activity that trigger high growth of meiofauna.Â ostracoda, oligochaeta, tunicata and ciliophora are the phylum with high levels of abundance compared to other meiofauna, as it that phylum has a high adaptability to the entry of pollutant material in the water. Diversity index and evenness indicatesÂ the meioufauna in the Losari Coast categorized by a high level of diversity and evenly distributed. WhileÂ dominance index indicated that no dominant meifauna species, except at research stations located around the Losari Beach reclamation project. Keywords: Abundance, meiofauna, anthropogenic, Coastal Losari Beach, Makassar

The Regionalism of Borders in Indonesia (Case Study: Sebatik Island, Indonesia) Nugroho, Agung Satriyo; Rijanta, R; Santoso, Purwo; Marfai, Muh Aris
Indonesian Journal of Geography Vol 55, No 3 (2023): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.79811

Border management has, on the one hand, grown beyond the conceptual limit that is the terminological deﬁnition of borders as lines separating countries to also factor in their development as areas. On the other, it should aim to strengthen state sovereignty and improve the welfare of its citizens. Tese ofen lead to the dichotomy between security and prosperity in border management approaches. Regionalism is an approach used to create regional integration across national borders, but this concept is strongly inﬂuenced by the interests of states on each side of the border. Terefore, this research explores if spatial interaction between border communities is controlled by the regionalism concept introduced by the state or, instead, grows organically as part of regionalization due to livelihoods that require border crossings. It used a case study of Sebatik Island in the Indonesia-Malaysia border area. Te qualitative research design applied exploratory principles on the spatial interaction pattern formed between border communities and then synthesized the identiﬁed units of information on transboundary activities while considering government-issued policies on border management. Results showed that regionalism was only minimally implemented in managing the border area. It means that border landscapes in Indonesia are organically formed on the micro-scale even though the perspective of regionalism has long been adopted at the regional level, i.e., ASEAN.

Shoreline Dynamics in the Very Small Islands of Karimunjawa – Indonesia: A Preliminary Study Alwi, Mulyadi; Mutaqin, Bachtiar W.; Marfai, Muh Aris
Geoplanning: Journal of Geomatics and Planning Vol 10, No 1 (2023)
Publisher : Department of Urban and Regional Planning, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/geoplanning.10.1.73-82

Indonesia is considered one of the biggest archipelagic countries in the world. According to some literature, Indonesia has more than 17,000 islands, most of which are classified as small islands. Some of these islands have become important areas for tourism, for instance, small islands in Karimunjawa. However, some of these islands experienced shoreline changes caused by erosion and accretion. Hence, this research aims to map the spatial distribution of shoreline change using the Digital Shoreline Analysis System (DSAS) add-in on ArcGIS. The primary dataset utilized as input consists of Sentinel 2A imagery captured over 2017 and 2022. The results showed that around 89 segments, or 51.47% of the total shoreline segments, tend to experience accretion, while the remaining 79 segments, or 45.93%, experience erosion. This finding suggests that most shoreline segments tend to accrete or seaward movement in the research area. The results of this study exhibit notable disparities when compared to the occurrences observed in Pandeglang (Banten), Kuwaru (Yogyakarta), Buleleng (Bali), and East Java Province, where coastal erosion prevails over accretion. The managers of the islands try to reduce the threat of erosion by constructing dykes and breakwaters. However, these buildings are ineffective due to the relatively simple structures and building materials. Therefore, further studies are needed to determine the type and specification of mitigation buildings that are suitable for implementation in that location.

Hubungan Dinamika Sosial Ekonomi Wilayah dengan Interaksi Ruang Kawasan Perbatasan di Pulau Sebatik, Kalimantan Utara Agung Satriyo Nugroho; Rijanta; Santoso, Purwo; Marfai, Muh Aris
Jurnal Spatial Wahana Komunikasi dan Informasi Geografi Vol. 23 No. 1 (2023): Spatial : Wahana Komunikasi dan Informasi Geografi
Publisher : Department Geography Education Faculty of Social Science - Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/spatial.231.04

The state border area has an important position for state sovereignty. Sebatik Island is one of the border areas designated as PKSN for defense and security purposes, along with a new growth center in the economic sector. Therefore it is necessary to know the development of the socio-economic condition of the region along with the various spatial interaction activities that have been carried out by the border communities of Sebatik Island. This paper aims to (1) identify the socio-economic conditions of the area in the Sebatik Island Border Area, (2) identify spatial interaction activities carried out by border communities on Sebatik Island in order to fulfill their daily needs, (3) assess the relationship between socio-economic conditions in Sebatik Island with spatial interactions between regions that have been carried out by the community. This study uses qualitative methods by applying the principle of data triangulation. Some research results can be fund is the Sebatik island region still has a dependence on other regions, one of which is on the territory of neighboring countries. This becomes an anomaly if it is associated with the function of the border area as a manifestation of state sovereignty

Modeling Seasonal Variations of Sediment Transport and Morphological Changes in Delta Ecosystem: A Case Study of the Wulan Delta, Indonesia Fadlillah, Lintang Nur; Widyastuti, Margaretha; Kim, Dong Hyeon; Marfai, Muh Aris
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 30, No 1 (2025): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.30.1.21-30

The suspended sediment from the Serang River plays a crucial role in the development of the Wulan Delta. This study employs the open-source DELFT3D model to investigate seasonal hydrodynamics, sediment distribution, and morphodynamic changes in the delta. Sediment dynamics during both the rainy and dry seasons were analyzed using the DELFT3D-Flow model. Tidal data were sourced from TPXO 9v1 and field measurements, while bathymetric data from GEBCO were validated against in-situ observations. Model results indicate seasonal sediment concentration patterns, which were further validated against satellite imagery, demonstrating consistency between simulated and observed sediment distribution. Statistical analysis revealed an RMSE range of 0.001 to 0.061. The estimated sediment deposition rate is approximately 1.2 t·yr⁻¹, with a deposition rate of 2.74 t·m⁻²·yr⁻¹ at both river mouths. About 12% of the sediment accumulates near the river mouth, while the remainder is redistributed by currents influenced by the Java Sea's bed morphology. Erosion was primarily observed in the eastern part of the delta and at the OWR mouth, whereas the western delta exhibited significant deposition due to strong river currents and substantial sediment supply. This sediment distribution suggests potential delta expansion from the west to the north. Findings contribute to the understanding of sediment transport processes in deltas, with implications for mitigating coastal erosion, enhancing delta resilience, and preserving ecosystems in similar regions across northern Java.

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