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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Jurnal Geodesi Undip Journal of Marine Research Jurnal Kelautan : Indonesian Journal of Marine Science and Technology International Conference on Coastal and Delta Areas Jurnal Kelautan Tropis Bioedukasi: Jurnal Pendidikan Biologi JURNAL METEOROLOGI DAN GEOFISIKA Proceeding Biology Education Conference Indonesian Journal of Oceanography Journal of Marine Research Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan

Muhammad Helmi

Departemen Oseanografi Fakultas Perikanan Dan Ilmu Kelautan Universitas Diponegoro

Author-ID : 2653286

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Medicine & Pharmacology Physics Public Health Other

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KOMPARASI POLA SPASIAL KONDISI TERUMBU KARANG TAMAN NASIONAL KARIMUNJAWA M Munasik; Andy Ahmad Romadhoni; Muhammad Helmi
Jurnal Kelautan Vol 14, No 2: Agustus (2021)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v14i2.11436

ABSTRACTComparative studies on the percentage of coral reef substrate cover have been carried out in 3 (three) management zones (protection zone, utilization and Non-MPA) Karimunjawa National Park (KNP). The Manta Tow broadscale coral reef assessment method was applied to the north side of Bengkoang Island and the south side of Cemara Besar Island (protection zone), southern side of Bengkoang Island and northern side of Cemara Besar Island (utilization zone) and Non-MPA (Seruni Island) to observe live coral cover, dead coral, coral rubble and soft coral. Substrate cover variations from 10-12 towing (track length 200m) from each side of the island have formed a spatial pattern of coral reef conditions. Furthermore, the condition of the coral reefs was confirmed using the UPT (Underwater Photo Transect) detailed assessment method with one station on each side of the island. The results showed that there were differences in the spatial pattern of coral reef conditions as indicated by significant differences in the percentage of live coral cover, dead coral, rubble and coral lifeform among management zones of the KNP. The condition of coral reefs of the MPA is better and has a higher diversity of coral species than Non-MPA of the Karimunjawa National Park. The spatial pattern of coral reef conditions can be used as an indicator of disturbances in the coral reef ecosystem and can be used for periodic analysis of coral reef monitoring data in conservation areas.Keywords: spatial pattern, coral reef condition, manta tow, underwater photo transect, Karimunjawa National Park.ABSTRAKStudi perbandingan persentase tutupan substrat terumbu karang telah di lakukan pada 3 (tiga) zona pengelolaan (zona perlindungan, pemanfaatan dan luar kawasan) Taman Nasional Karimunjawa. Metode penilaian terumbu karang skala luas Manta Tow diaplikasikan di sisi utara P. Bengkoang dan sisi selatan P. Cemara Besar (zona perlindungan), sisi selatan P. Bengkoang dan sisi utara P. Cemara Besar (zona pemanfaatan) dan luar kawasan (P. Seruni) untuk mengamati tutupan karang hidup, karang mati, pecahan karang dan karang lunak. Variasi persentase tutupan substrat dari 10-12 tarikan Manta Tow (panjang lintasan 200m) dari masing-masing sisi pulau telah membentuk pola spasial kondisi terumbu karang. Selanjutnya penilaian kondisi terumbu karang dikonfirmasi dengan menggunakan metode penilaian rinci UPT (Underwater Photo Transect) dengan satu stasiun setiap sisi pulau. Hasil menunjukkan terdapat perbedaan pola spasial kondisi terumbu karang yang ditunjukkan oleh perbedaan yang signifikan persentase tutupan karang hidup, karang mati, pecahan karang dan lifeform karang antar zona pengelolaan. Kondisi terumbu karang di dalam kawasan lebih baik dan memiliki keragaman jenis karang lebih tinggi daripada di luar kawasan Taman Nasional Karimunjawa. Pola spasial kondisi terumbu karang dapat dijadikan indikator terjadinya gangguan pada ekosistem terumbu karang di suatu kawasan dan dapat digunakan untuk analisis data pemantauan terumbu karang secara berkala di kawasan konservasi.Kata Kunci: pola pasial, kondisi terumbu karang, manta tow, underwater photo transect, Taman Nasional Karimunjawa,

Model Sebaran Penurunan Tanah di Wilayah Pesisir Semarang Aris Ismanto; Anindya Wirasatriya; Muhammad Helmi; Agus Hartoko; Prayogi Prayogi
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 14, No 4 (2009): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Banjir rob merupakan fenomena bencana yang melanda daerah pesisir Kota Semarang sejak 30 tahun terakhir yang sampai saat ini belum dapat tertanggulangi dan bahkan semakin meluas. Penyebab utama timbulnya banjir rob adalah terjadinya penurunan tanah yang dapat mencapai + 15 cm/tahun. Untuk mengatasi masalah tersebut diperlukan informasi yang akurat mengenai penurunan tanah yang terjadi, terutama mengenai zona sebaran penurunan tanah yang dikaitkan dengan penggunaan lahan. Penelitian ini bertujuan untuk mengetahui sebaran spasial Penurunan Tanah di Pesisir Kota Semarang sehingga diharapkan bisa menjadi acuan bagi Pemerintah Kota Semarang dalam rangka penanggulangan banjir rob. Data spot height peta RBI dan hasil pengukuran lapangan dengan menggunakan DGPS digunakan dalam penelitian ini. Laju penurunan tanah dihitung berdasarkan perbedaan ketinggian wilayah pada saat ini dengan ketinggian wilayah pada spot height peta RBI, tahun 2001. Data citra satelit IKONOS yang didownload dari Google Earth digunakan untuk mengetahui penggunaan lahan eksisting. Pengolahan data dilakukan berbasis Sistem Informasi Geografis dengan menggunakan tool Spatial Analyst pada software Arc GIS 9.1. Hasil penelitian memberikan gambaran bahwa Kota Semarang mempunyai luas 17.073,23 ha dan laju penurunan tanah <1 cm/thn terjadi seluas 3.355,93 ha (19,7%); 1,1-4 cm/thn seluas 6.515,77 ha (38,2%), 4,1-8 cm/thn seluas 5.048,51 (29,6%); 8,1-12 cm/thn seluas 1.685,6 ha (9,9%); dan 12,1-15 cm/thn seluas 467,45 ha (2,7%). Penurunan tanah tersebut menyebar secara spasial di Kecamatan Genuk (8.1-15 cm/th) dan Semarang Utara serta sebagian Semarang Barat (4.1-12 cm/th). Kecamatan Tugu memiliki tingkat penuruan tanah yang relatif rendah, yaitu kurang dari 1 cm/th. Kata kunci: Semarang, Banjir Rob, Penurunan tanah, Since the last 30 years, Tidal flood hazard in the Semarang Coastal Area has never been clearly solved and even getting worse time to time. Most possible cause of this tidal flooding is believed land subsidence which reaches up to 15cm/year. Accurate information of land subsidence distribution, in relation to land use, is therefore needed to ease this flooding problem. The study is aimed to identify spatial distribution of land subsidence in Semarang coastal area which hopefully can be used as scientific reference for Semarang City Government on solving this tidal flooding problem. A spot height data of Indonesian Land Surface (RBI) map was used as the main information of the study collaborated with comprehensive field measurement using DGPS. Land subsidence rate was then calculated as differences between actual height of the location with spot height indicated on 2001 RBI map. An IKONOS satellite image of the same spot was then used to determine existing land use of the area. The dara were processed using a GIS-based analysis ‘Spatial Analyst’ of ArcGIS 9.1. The result showed that among total of 17.073,23 ha of the study area 3.355,93 ha (19,7%) has rate of land subsidence of <1cm/year, 6.515,77 ha (38,2%) of 1.14cm/year, 5.048,51 ha (29,6%) of 4.1-8cm/year, 1.685,6 ha (9,9%) of 8.1-12cm/year and 467,45 ha (2,7%) of 12.1-15cm/year. Spatial distribution of land subsidence in Semarang is spreading in Genuk (8.1-15 cm/th), North Semarang and West Semarang District (4.1-12 cm/th). Land subsidence in Tugu District is relatively lower, that is less then 1 cm/th. Key words: Semarang, tidal flood, land subsidence,

Zonasi Ekosistem Alami dengan Pendekatan Ekologi Lanskap Menggunakan Pemodelan Spasial Berbasis Sel di Pulau Karimunjawa dan Kemujan, Kabupaten Jepara, Jawa Tengah Muhammad Helmi
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 12, No 3 (2007): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Artikel ini difokuskan pada pendekatan ekologi lanskap dan pemodelan spasial berbasis sel untuk penyusunan zonasi ekosistem alami di Pulau Karimunjawa dan Kemujan. Zonasi ekosistem alami pada penelitian ini dilakukan pada 5 (lima) ekosistem yang terdiri dari terumbu karang, padang lamun, mangrove, hutan pantai dan hutan tropis dataran rendah. Karimunjawa dan Kemujan adalah dua pulau kecil yang berpenghuni dan terletak besebelahan.di dalam kawasan Taman Nasional Karimunjawa. Ekologi lanskap merupakan konsep yang mengintegrasikan aspek ekologi dan aspek spasial. Kondisi lanskap yang kompleks di pulau ini dapat disederhanakan dan direpresentasikan sebagai layer-layer tematik, diintegrasi menggunakan pemodelan spasial. Cell based modeling adalah pemodelan data spasial yang berbasis raster, sel atau piksel yang merepresentasikan area sebagai obyek yang spesifik. Kondisi ekologi lanskap pulau Karimunjawa dan kemujan direpresentasikan dalam sel dengan resolusi 10m x 10m dan dianalisis menggunakan teknik pemodelan topografi, hidrologi dan pembobotan untuk menyusun zonasi. Data spasial lanskap ekosistem alami diekstrak dari satelit penginderaan jauh Terra/ASTER, peta tematik dan survei. Hasilnya adalah zona konservasi yang terdiri dari subzona preservasi, sempadan (sempadan sungai, pantai dan mata air), rehabilitasi, situs bersejarah, pemanfaatan tradisional dan sub zona alur pelayaran di perairan Pulau Karimunjawa dan Kemujan. Kata kunci: Ekosistem alami, ekologi lanskap, pemodelan spasial berbasis sel. This article is focused to landscape ecology approach and cell based modeling for the natural ecosystem zonation in Karimunjawa and Kemujan. Natural Ecosystem zonation on this research is focused on five natural ecosystems, such as coral reef, sea weed, mangrove, coastal forest and low land tropical forest. Karimunjawa and Kemujan are two populated small island neighbors in Karimunjawa National Park, Central Java. Landscape ecology is an integrated concept of ecology and spatial aspect that can be used to design natural ecosystem zonation. A complex landscape condition in these islands can be simplified and represent as thematic layers, integrate and manage them using spatial modeling. Cell based modeling is spatial modeling data processing base on raster, cells or pixel that represent an area with specific object. Landscape ecology condition of Karimunjawa and Kemujan Islands is represent to 10m x 10m resolution of cell and analyst them using modeling techniques, such as topography, hydrology and weighted to design zonation. Landscape ecology of natural ecosystem spatial data are extracted from Terra/ASTER remote sensing satellite system, thematic map and survey. The result is conservation zone that consist of sub zones include preservation, protected areas (river and beach green belt and water spring), rehabilitation, historical/religious site areas, traditional use and sea lenes in Karimunjawa and Kemujan coastal area. Key words: Natural ecosystem, landscape ecology, cell based modeling

EVALUATION OF EMERGE LAND FOR MANGROVE CONSERVATION PROGRAM IN KALIWLINGI, BREBES DISTRICT, BREBES REGENCY Aditya Dwi Nugroho; Muhammad Helmi; Jusup Supriijanto
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 16, No 3 (2020): SAINTEK PERIKANAN
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijfst.16.3.%p

Mangrove ecosystems are very important in the balance of ecosystems in coastal areas, because many mangrove functions cannot be replaced by other ecosystems or vegetation from physical, ecological to economic functions. The mangrove ecosystem is decreasing along with the development of coastal areas construction, reclamation, and natural factors including coastal abrasion. This study aims to evaluate emerge land for the mangrove rehabilitation conservation program in Kaliwlingi, Brebes Regency. The imagery used is Landsat satellite imagery and Sentinel in 1999, 2004, 2009, 2014, and 2019. Image processing is done with the support of ER Mapper 7,0, Arc GIS 10,2,2, The method of determining land for mangrove rehabilitation includes the physical conditions of the waters and the analysis of the sediment’s grain size. Adjustment area of abrasion in Kaliwlingi, Brebes Regency from 1999 to 2019 were 121,42ha, 109,32ha, 102,98ha and 151,57ha, respectively, Meanwhile, there are 4 points of emerge land found in the research location, With the units of abrasion value in Kaliwlingi, Brebes Regency and emerge land can be used as mangrove rehabilitation area.

The Lost of Semarang Coastal Areas due to Climate Change and Land Subsidence Suripin .; Helmi Muhammad
International Conference on Coastal and Delta Areas Vol 1, No 1 (2015): Management and Engineering in the Sustainable Development on Delta Areas
Publisher : International Conference on Coastal and Delta Areas

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

Semarang is the capital of Central Java Province, located in the northern part of JavaIsland, Indonesia, with an area of about 374 km2 and inhabited by about 1.57 million people. It has been reported for some time that coastline of Semarang is retreated. This backwards movement is mainly due to coastal erosion triggered by climate change effects, land subsidence, and coastal structures jutting to the sea. During the last two decades (1990-2010) the annual rainfall has increased 18.66 mm per year, while the maximum daily storm increased 0.82 mm/year, and the storm intensity increased annually by 0.4 - 0.5 mm/hour. Consequently, the runoff is estimated toincrease by 8% to 30%, and the flooded area increased about 5% to 15% for the next two decades. Based on sea level data recorded in Tanjung Emas Harbor during the period of 1985 up to 2008, it was found the annual relative sea level rise and land subsidence on the station are 5.536 cm/year and 5.165 cm/year consecutively, and the sea level rise is 3.7 mm per year. Interpretation of satellite imagery in 1991 and 2009 showed that 25.6 km of the total 36.6 km is eroded. This erosion has removed the coastal plain area of 1,764.5 ha. This paper is aimed to discribe and discuss the lost of Semarang Coastal Areas and sum up with concluding remarks.

STUDI PEMETAAN HABITAT DASAR PERAIRAN LAUT DANGKAL BERDASARKAN ANALISIS DIGITAL MENGGUNAKAN CITRA PLEIADES MULTISPEKTRAL DI PERAIRAN PULAU MENJANGAN BESAR, KEPULAUAN KARIMUNJAWA, JAWA TENGAH Faisal Aldin; Yudo Prasetyo; Muhammad Helmi
Jurnal Geodesi UNDIP Volume 9, Nomor 1, Tahun 2020
Publisher : Departement Teknik Geodesi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (880 KB)

ABSTRAKPulau Menjangan Besar adalah salah satu pulau di Kepulauan Karimunjawa yang terkenal dengan wisata bawah laut terutama terumbu karang. Terumbu karang merupakan bagian dari habitat dasar perairan laut dangkal yang memiliki potensi sumber daya laut dan patut diperhitungkan sehingga pemetaan sebaran dan luasan habitat dasar perairan laut dangkal sangatlah dibutuhkan dalam pengembangan potensi sumber daya laut dan pesisir. Kurangnya informasi ilmiah terkait habitat dasar perairan laut dangkal terutama terumbu karang di Pulau Menjangan Besar membuat proses pemantauan keadaan habitat dasar perairan laut dangkal mengalami kesulitan.Tujuan dari penelitian ini adalah mengetahui kemampuan dan potensi citra satelit Pleiades-1A multispektral dalam pemetaan habitat dasar perairan laut dangkal dan mengetahui kelas dan pola spasial habitat dasar perairan laut dangkal berdasarkan hasil analisis citra satelit Pleiades-1A dan survei lapangan. Metodologi yang digunakan dalam penelitian ini adalah pemanfaatan teknologi pengindraan jauh menggunakan citra Pleiades-1A dengan algoritma Lyzenga. Metode algoritma Lyzenga digunakan untuk memetakan material penutup material penutup substrat dasar pada perairan laut dangkal.Berdasarkan hasil pengolahan dan klasifikasi citra Pleiades-1A diperoleh hasil uji akurasi sebesar 88,33 %. Hasil tersebut menunjukan bahwa citra Pleiades-1A mampu mendeteksi kanampakan habitat dasar perairan laut dangkal secara baik. Berdasarkan hasil klasifikasi dalam pemetaan habitat dasar perairan laut dangkal menunjukan kenampakan 5 kelas yang terdiri dari kelas pasir sebesar 60%, kelas makroalga 17%, kelas terumbu karang 11%, kelas lamun 8% dan kelas pecahan karang 4%. Pola dari masing-masing kelas tersebar secara acak di daerah penelitian dan didominasi oleh kelas pasir. Kata Kunci : Algoritma Lyzenga, Citra Pleiades-1A, Habitat Dasar Perairan Laut Dangkal, Menjangan Besar ABSTRACTMenjangan Besar Island is one of the islands in the Karimunjawa Islands. The island is famous for underwater tourism especially coral reefs. Coral reefs are part of shallow sea bottom habitats that have considerable marine resource potential so that the mapping of the distribution and extent of shallow sea bottom habitats is very much needed in developing the potential of marine and coastal resources. Lack of scientific information related to shallow sea bottom habitats, especially coral reefs on the Menjangan Besar Island, has made it difficult to monitor the situation of shallow sea bottom habitats.The purpose of this study is to determine the ability and potential of multispectral Pleiades-1A satellite imagery in mapping shallow sea bottom habitats and determine the class and spatial patterns of shallow sea bottom habitats based on the results of Pleiades-1A satellite image analysis and field survey. The methodology used in this research is the use of remote sensing technology using Pleiades-1A imagery with Lyzenga algorithm. The Lyzenga algorithm method is used to map the covering material of shallow seabed cover material.Based on the results of processing and classification of Pleiades-1A images obtained an accuracy test results of 88.33%. These results indicate that the Pleiades-1A imagery is able to detect the appearance of shallow sea bottom habitats. Where the results of the classification in the mapping of shallow sea bottom habitats are divided into 5 classes consisting of 60% sand class, 17% macroalgae class, 11% coral reef class, 8% seagrass class and 4% coral fraction class. The patterns of each class are randomly distributed in the study area and are dominated by sand classes. Keyword : Lyzenga Algorithm, Menjangan Besar, Pleiades-1A Imagery, Shallow Sea Bottom Habitats

Analisa Perubahan Penggunaan Lahan Di Daerah Aliran Sungai Serayu Hulu Dengan Pengginderaan Jauh dan Sistem Informasi Geografis Yuari Susanti; Syafrudin Syafrudin; Muhammad Helmi
Proceeding Biology Education Conference: Biology, Science, Enviromental, and Learning Vol 16, No 1 (2019): Proceeding Biology Education Conference
Publisher : Universitas Sebelas Maret

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

Globalization and the development of science and technology causehuman needs increase. This has an effect on land use, especially in watershed areas. Serayu is one of watershed in Central Java which is have problems related to land use, which occurs in the upper of the watershed.Agricultural Intensification, deforestation, an increase in population are factors that drives land use change in the upper of Serayuwatershed.Utilization of watershed areas that ignore spatial rules causes pollution and land degradation. That condition happened and this makes the Serayuwatershed one of the priority watersheds for rehabilitation in Indonesia.Remote Sensing (RS) and Geographic Information Systems (GIS) are tools that used to analyze land use changes that occurred in 2009-2019. Land use classification is derived from the interpretation of Sentinel Image 2 and land use maps in 2009. Land use is classified into six classes; water bodies (rivers, lakes, ponds), built-up areas, shrubs, forests, agriculture (rice fields, fields), empty land.

SIMULASI ROB DI SEMARANG MENGGUNAKAN MODEL HIDRODINAMIKA 2D Muhammad Najib Habibie; Agus Hartoko; Nining Sari Ningsih; Muhammad Helmi; Siswanto Siswanto; Roni Kurniawan; Andri Ramdhani; Rahayu Sapta S. Sudewi
Jurnal Meteorologi dan Geofisika Vol 13, No 2 (2012)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Semarang merupakan salah satu kawasan yang sering mengalami genangan air pasang (rob) yang dipengaruhi oleh beberapa faktor yaitu: faktor meteorologi, laju penurunan tanah dan faktor astronomi (pasang surut). Penelitian ini bertujuan untuk mengetahui kehandalan model dan peran faktor meteorologi pada simulasi genangan rob di wilayah Semarang. Metode yang digunakan adalah analisa kenaikan tinggi muka laut beserta penurunan muka tanah, simulasi model dengan Hidrodinamika 2D serta verifikasi menggunakan data citra satelit IKONOS untuk mengetahui wilayah genangan. Dari simulasi model hidrodinamika 2D pada tanggal 13 Juni 2009 - bertepatan dengan siklon tropis Linfa di Laut Cina Selatan - yang memperhitungkan komponen pasang surut, tekanan dan angin diperoleh hasil yang menunjukkan wilayah Semarang Barat mengalami pengurangan batas pantai sejauh 221 m dan wilayah Pelabuhan sebesar 270 m dibanding jika komponen pasang surut saja yang diperhitungkan. Selain itu tinggi muka laut juga meningkat sebesar 10 cm ketika memasukkan komponen kecepatan angin dan tekanan udara permukaan. Hasil luaran model ketika dibandingkan dengan citra satelit IKONOS menunjukkan kemiripan yang berarti model telah merepresentasikan kondisi sebenarnya. Semarang is one of the area that experienced by inundation controlled by meteorological factor, subsidence and astronomical tide. The purpose of this research is to investigate the model performance and the role of meteorological factor on inundation area by using the 2D Hydrodynamic model. The simulation outputs are verified by IKONOS satellite data. By using the air pressure and wind data as the atmospheric forcings on June 9, 2009 coincides with tropical cyclone Linfa on South China Sea, the output of the model shows that the inundation is expanded up to 221 m in the West Semarang and 270 in the Semarang Harbor, compare to the output just using the tidal data only. Modeled-results also show that the sea level increase 10 cm. The output of 2D Hydrodynamic model have same pattern with IKONOS satellite image when both of them compared, so the model simulation represented actual condition on inundation field.

Karakteristik Arus Laut Permukaan dari High Frequency Radar pada Musim Timur di Selat Bali Shafira Tsanyfadhila; Aris Ismanto; Muhammad Helmi
Jurnal Kelautan Tropis Vol 25, No 3 (2022): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v25i3.13978

Bali Strait has many activities in port and water, such as passenger and freight transportation, tourism, and fisheries. Oceanographic conditions, especially sea surface current (SSC), affect the smoothness of ports and shipping activities in the Bali Strait. High-Frequency Radar (HF Radar) has the advantage of monitoring and mapping surface currents and ocean waves with high resolution. Because of the narrow strait area, HF Radar is very beneficial in describing the characteristics of SSC in the Bali Strait. Therefore, HF Radar data is used to describe the dynamics of SSC in the Bali strait, especially in ship crossing lane, with a temporal approach during Southeast Monsoon, June to August 2020. This study was conducted for 15 days each month which included neap tide and spring tide. Surface current charts are created to analyze the pattern of temporal SSC against the wind, tides, and their components. The results showed In the southeast monsoon, the average current speed at the research site ranged from 0.1 – 1.08 m/s. The direction of the surface current is predominantly towards the south. The characteristics of surface currents in the Bali Strait are influenced by tides, sea level anomalies, and coastal morphology. Temporally, the speed of the current is greater during the ebb phase and when the spring tide. Spatially, the central region of the Bali Strait waters has a greater current speed. Knowledge of areas and times with higher current speeds can be the basis for determining the shipping lane between ports in the Bali Strait. Selat Bali memiliki banyak kegiatan di pelabuhan dan perairan, seperti transportasi penumpang dan barang, pariwisata, serta perikanan. Kondisi oseanografi, khususnya arus permukaan laut, mempengaruhi kelancaran pelabuhan dan aktivitas pelayaran di Selat Bali. High-Frequency Radar (HF Radar) memiliki keunggulan pemantauan dan pemetaan arus permukaan dan gelombang laut dengan resolusi tinggi. Karena wilayah selat yang sempit, HF Radar sangat bermanfaat dalam menggambarkan karakteristik arus permukaan laut di Selat Bali. Oleh karena itu, data HF Radar digunakan untuk menggambarkan dinamika arus permukaan laut di jalur penyeberangan Selat Bali dengan pendekatan temporal pada musim timur, bulan Juni hingga Agustus 2020. Penelitian ini dilakukan selama 15 hari tiap bulan yang mencakup waktu pasang purnama dan pasang perbani. Grafik arus permukaan dibuat untuk menganalisis pola arus permukaan laut secara temporal ketika musim timur terhadap angin, pasang surut dan komponennya. Hasil menunjukkan pada musim timur, rata – rata kecepatan arus di lokasi penelitian berkisar antara 0.1 – 1.08 m/s. Arah arus permukaan dominan ke arah selatan. Karakteristik arus permukaan di Selat Bali di pengaruhi oleh pasang surut, sea level anomaly dan morfologi pantai. Secara temporal, kecepatan arus lebih besar ketika menuju surut dan ketika pasang purnama. Secara spasial, wilayah tengah perairan Selat Bali memiliki kecepatan arus yang lebih besar. Pengetahuan mengenai wilayah perairan dan waktu – waktu dengan kecepatan arus yang tinggi dapat menjadi dasar dalam penentuan alur pelayaran antar pelabuhan di Selat Bali.

Integrasi Pendekatan Geospasial Dan Model Hidrodinamika 2D Untuk Kesesuaian Budidaya Ikan Kerapu Menggunakan Keramba Jaring Apung Di Perairan Pulau Menjangan Besar, Kepulauan Karimunjawa, Provinsi Jawa Tengah Aryobimo Bharadian Ariputro; Dwi Haryo Ismunarti; Muhammad Helmi
Indonesian Journal of Oceanography Vol 4, No 2 (2022): Indonesian Journal of Oceanography
Publisher : University of Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijoce.v4i2.14100

Akuakultur merupakan solusi untuk mengatasi permasalahan produksi perikanan sekaligus kelangkaan ikan pada suatu perairan. Efektifitas akuakultur ditentukan dari banyak faktor, Lokasi yang sesuai merupakan salah satu faktor yang paling mempengaruhi kegiatan akuakultur. Perairan Menjangan Besar, Kepulauan Karimunjawa merupakan suatu wilayah di Indonesia yang memiliki kelimpahan kekayaan maritim dan memiliki potensi yang besar untuk pengembangan budidaya berbasis Keramba Jaring Apung (KJA) khususnya ikan kerapu. Kurangnya informasi mengenai lokasi yang efektif untuk budidaya merupakan permasalahan utama dalam usaha budidaya. Penentuan lokasi budidaya perairan sangat dipengaruhi oleh parameter oseanografi di perairan setempat diantaranya arus, suhu, gelombang, oksigen terlarut, ph, salinitas, substrat dasar dan kedalaman. Oleh karena itu diperlukan kajian dan analisis mengenai lokasi yang efektif serta cocok untuk pengembangan budidaya ikan kerapu berbasis keramba jaring apung di perairan Menjangan Besar, Kepulauan Karimunjawa. Survey lapangan dilakukan terhadap 40 titik stasiun yang diperoleh dengan metode purposive sampling. Selain itu dilakukan pemodelan hidrodinamika 2D terhadap kecepatan arus dan tinggi gelombang signifikan untuk digabungkan dengan hasil survey lapangan sehingga diperoleh kondisi oseanografi perairan. Kemudian dilakukan Analisis data dengan melakukan modifikasi pada kriteria kesesuaian yang kemudian diintegrasikan dengan pendekatan Sistem Informasi Geografis menggunakan program ArcGIS 10.3. Berdasarkan integrasi kesesuaian perairan, luas area perairan yang sangat cocok untuk pengembangan budidaya ikan kerapu berbasis sistem keramba jaring apung adalah 60.91 ha. Kata kunci: Kesesuaian Perairan, Ikan Kerapu, Sistem Informasi Geografis, Menjangan Besar Abstract Aquaculture is a solution to overcome the problem of fishery production as well as the scarcity of fish in a waters. The effectiveness of aquaculture is determined by many factors, the appropriate location is one of the most influencing factors for aquaculture activities. Menjangan Besar waters in the Karimunjawa archipelago is an area in Indonesia that has an abundance of maritime wealth and has great potential for the development of aquaculture based on floating net cages (FNC), especially grouper. Lack of information on effective locations for cultivation is a major problem in aquaculture. Determination of aquaculture locations is strongly influenced by oceanographic parameters in local waters including currents, temperature, waves, dissolved oxygen, pH, salinity, bottom substrate and depth. Therefore, it is necessary to study and analyze an effective and suitable location for the development of grouper aquaculture based on floating net cages in the waters of Menjangan Besar, Karimunjawa archipelago. The field survey was conducted on 40 station points obtained by purposive sampling method. In addition, 2D hydrodynamic modeling was carried out on current velocity and significant wave height to be combined with the results of field surveys so that oceanographic conditions of the waters were obtained. Then the data analysis was carried out by modifying the suitability criteria which was then integrated with the Geographic Information System approach using the ArcGIS 10.3 program. Based on the integration of the suitability of the waters, the area of the waters that is very suitable for the development of grouper aquaculture based on the floating net cage system is 60.91 ha. Keywords : Water Suitability, Grouper, Geographic Information System, Menjangan Besar

Co-Authors Ade Firdaus Triagusta Aditya Dwi Nugroho Adzkia Pincta Milenia Agus Hartoko Alfi Satriadi Andri Ramdhani Andy Ahmad Romadhoni Anindya Wirasatriya Aris Ismanto Aryobimo Bharadian Ariputro Azis Nur Bambang Azis Rifai Baskoro Rochaddi Daffa Dinan Ihsani El-Fath Denny Nugroho Sugianto Dini Oktaviani Dwi Haryo Ismunarti Dwi Haryo Ismunarti Faisal Aldin Faiz Hamzah Adriono Fuji Anida Geby Ayunda Gentur Handoyo Hadiwijaya L. Salim Hariyadi Hariyadi Heryoso Setiyono Ibnu Pratikto Indra Budi Prasetyawan Jusup Supriijanto Kunarso Kunarso Lilik Maslukah Louis Jannahtuna'im Koes Miranda Maria Griselda Novita Muh Yusuf Muh Yusuf Muhammad Najib Habibie Muhammad Zainuri Muslim Muslim Nabila Fitri Choiriah Nasir Sudirman Nining Sari Ningsih Nugroho Agus D Nurfatin Adibah Petrus Subardjo Prayogi Prayogi Purwanto Purwanto Rahayu Sapta S. Sudewi Rikha Widiaratih Rikoh Manogar Siringoringo Roni Kurniawan Rudhi Pribadi S. Suripin Shafira Tsanyfadhila Siswanto Siswanto Sugeng Widada Suharsono Suharsono Surya Nugraha Syaiful Syafrei Adi Iskandar Syafrudin Syafrudin Tri Abdul Hidayat Warsito Atmodjo Yuari Susanti Yuari Susanti Yudo Prasetyo Zahra Safira Aulia

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