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All Journal Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut Jurnal Ilmu dan Teknologi Kelautan Tropis Journal of Marine and Aquatic Sciences ILMU KELAUTAN: Indonesian Journal of Marine Sciences Jurnal Kelautan : Indonesian Journal of Marine Science and Technology JGE (Jurnal Geofisika Eksplorasi) Jurnal Kelautan Tropis Omni-Akuatika BULLETIN OF THE MARINE GEOLOGY DoubleClick : Journal of Computer and Information Technology International Journal of Remote Sensing and Earth Sciences (IJReSES) JURNAL METEOROLOGI DAN GEOFISIKA Jurnal Ekologi, Masyarakat dan Sains Marine Kreatif Jurnal Riset Kelautan Tropis (Journal Of Tropical Marine Research) (J-Tropimar) Juvenil: Jurnal Ilmiah Kelautan dan Perikanan Journal of Coastal and Ocean Sciences Jurnal Abdimas Ekonomi dan Bisnis JURNAL SAINS DAN TEKNOLOGI PERIKANAN (JIKAN) Indonesian Journal of Oceanography Jurnal Miyang : Ronggolawe Fisheries and Marine Science Journal Jurnal Riset Kelautan Tropis (J-Tropimar) Jurnal Kelautan dan Perikanan Indonesia Journal of Fisheries & Marine Jurnal Meteorologi dan Geofisika Lempuk: Jurnal Ilmu Kelautan dan Perikanan
Amir Yarkhasy Yuliardi
Program Studi Ilmu Kelautan, Fakultas Perikanan Dan Ilmu Kelautan, Universitas Jenderal Soedirman
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Environmental Science Immunology & microbiology Library & Information Science Physics Social Sciences Veterinary Other

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SUITABILITY OF SPATIAL-TEMPORAL HABITAT OF YELLOWFIN TUNA (Thunnus albacares) USING MAXIMUM ENTROPY MODEL IN WEST SUMATRA Heltria, Septy; Noferdiman; Endang G, Ester Restiana; Ramdhani, Farhan; Yuliardi, Amir Yarkhasy
Marine Fisheries : Journal of Marine Fisheries Technology and Management Vol. 15 No. 2 (2024): Marine Fisheries: Journal of Marine Fisheries Technology and Management
Publisher : Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jmf.v15i2.52940

Abstract

Yellowfin tuna is one of the main catches in West Sumatera waters and has a high economic value. Fishing optimization can be improved through spatial and temporal predictions of fishing areas for effective fisheries management. This research aims to predict fishing areas using an oceanographic data approach through maximum entropy (MaxEnt) modelling. Data collection incorporating sea surface temperature and chlorophyll-a were obtained from the Aqua-Modis satellite in 2022 as well as fishing point data from Ocean Fishing Port (OFP) Bungus. The MaxEnt model shows a good level of accuracy in the West season (AUC 0,860), 1st Transitional season (AUC 0,918), East season (AUC 0,918), and 2nd Transitional season (0,920) The contribution of chlorophyll for one year is more significant, accounted for 75,3%, compared to sea surface temperature, constituted 24,7%. The Sea Surface Temperature (SST) values in West Sumatera waters vary on each season, ranging from 26,4 to 34.5 ℃ and the chlorophyll-a fluctuate between 0,03 and 5,45 mg/m3. The distribution of yellowfin tuna habitat on the map shows that most fishing vessel coordinates are in the Habitat Suitability Index (HSI) HSI value of 0,6 – 0,9. Potential areas for catching yellowfin tuna are around the Mentawai Islands. Keywords: Chlorophyll-a, HSI, Maximum Entropy Model, Sea Surface Temperature, Yellowfin Tuna
Dinamika Suhu Permukaan Laut dan Konsentrasi Klorofil-a di Perairan Laut Flores Hubungannya dengan Fenomena ENSO dan IOD Rachman, Herlambang Aulia; Hidayah, Zainul; Yuliardi, Amir Yarkhasy
Jurnal Kelautan Tropis Vol 28, No 1 (2025): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v28i1.25779

Abstract

The Flores Sea is a central region of Indonesia that plays a crucial role in the circulation of water masses. This area serves as a key pathway for the Indonesian Throughflow (ITF), which transports water from the Pacific to the Indian Ocean. The region is also known for its high productivity, particularly in fisheries. This study analyzes two important oceanographic parameters: Sea Surface Temperature (SST) and Chlorophyll-a concentration. The analyses conducted include monthly averages and anomalies and their relationship with interannual phenomena such as the El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD). To quantify the relationship between oceanographic parameters and these phenomena, correlation and partial correlation analyses were performed. The results indicate that SST and Chlorophyll-a exhibit seasonal fluctuations, particularly in the northern Flores Sea near Sulawesi Island. These fluctuations are suspected to be caused by seasonal upwelling in the region, driven by the movement of the Southeast Monsoon winds during the East Monsoon season (June–August). Upwelling is concentrated in the northern part of the Flores Sea, along the southern coast of Sulawesi Island. The correlation and partial correlation analyses also show that ENSO and IOD significantly impact the variability of oceanographic parameters in the Flores Sea, with IOD exerting a stronger influence than ENSO. Perairan Laut Flores merupakan kawasan yang terletak pada bagian sentral wilayah Indonesia yang memiliki peranan penting dalam sirkulasi massa air di Indonesia. Wilayah ini merupakan lokasi aliran Arus Lintas Indonesia (Arlindo) atau Indonesian Throughflow (ITF) yang mengalir dari Samudera Pasific menuju Hindia. Wilayah ini juga dikenal memiliki produktifitas perikanan yang cukup tinggi khususnya dalam sektor perikanan. Dalam penelitian ini menganalisis bagaimana dua parameter oseanografi yang cukup penting yakni Suhu Permukaan Laut (SPL) dan Konsentrasi Klorofil-a. Analisis yang dilakukan antara lain adalah rata-rata bulanan, anomaly, dan hubungannya dengan fenomena antar tahunan seperti El Nino Southern Oscillation (ENSO) dan Indian Ocean Dipole (IOD). Untuk mengkuantifikasi hubungan antara parameter oseanografi dengan kedua fenomena tersebut maka dilakukan analisis korelasi dan partsial korelasi. Hasilnya adalah parameter SPL dan Klorofil-a memiliki fluktuasi secara musiman, khususnya yang berada pada sisi utara dekat Pulau Sulawesi. Fluktuasi ini diduga diakibatkan oleh adanya fenomena Upwelling yang terjadi secara musiman pada wilayah ini akibat pergerakan dari Angin Muson Tenggara pada musim Timur (Juni-Agustus). Upwelling terfokus pada wilayah bagian sisi utara Laut Flores (pesisir selatan Pulau Sulawesi). Hasil analisis korelasi dan parsial korelasi juga menunjukkan fenomena ENSO dan IOD memberikan pengaruh yang cukup tinggi terhadap variabilitas parameter oseanografi di Laut Flores. Dimana fenomena IOD memberikan dampak yang lebih kuat dibanding dengan fenomena ENSO. 
Distribution of Sea Surface Temperature and Salinity in the Karimata Strait Yuliardi, Amir Yarkhasy; Firdaus, Randi; Heltria, Septy; Prayogo, Luhur Moekti; Nugroho, Agung Tri; Rahmalia, Diah Ayu; Sari, Ratna Juita
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January 2025
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.01.10-15

Abstract

The Karimata Strait possesses unique characteristics influenced by its geographical location and the local, regional, and global impacts on its physical, biological, and chemical parameters, contributing to its potential as a significant fishing ground. This study aims to observe and analyze the physical oceanographic parameters, including temperature, salinity, and sea surface currents, within the Karimata Strait. The dataset comprises monthly averaged data, resulting in a single representative value for each month. Key physical parameters examined include temperature, salinity, and the horizontal (u) and vertical (v) current components. The patterns of sea surface temperature (SST) and salinity distribution in the Karimata Strait exhibit significant variations between the west and east monsoons. During the west monsoon season, the South China Sea influenced the region with lower SST and higher salinity than the Java Sea. In contrast, the east monsoon demonstrates an inverse pattern with warmer, fresher waters from the Java Sea moving towards the strait. Additionally, the horizontal distribution of these parameters highlights the critical role of sea currents in dispersing physical oceanographic characteristics within the region. These findings underscore the dynamic nature of the Karimata Strait's oceanography, influenced by seasonal monsoon shifts, water masses from adjacent seas, and freshwater inputs from rivers, crucial for understanding the broader Indonesian Throughflow (ITF) system and its implications for regional climate and marine ecosystems
Variasi Musiman Spasial-Vertikal Suhu dan Salinitas di Teluk Tomini dan Laut Banggai Yuliardi, Amir Yarkhasy; Napitupulu, Gandhi; Prayogo, Luhur Moekti; Rahmalia, Diah Ayu; Sari, Ratna Juita; Nugroho, Agung Tri
Jurnal Kelautan dan Perikanan Indonesia Vol 5, No 2: Agustus (2025)
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jkpi.v5i2.47474

Abstract

Teluk Tomini merupakan salah satu wilayah semi-tertutup di Indonesia yang memiliki karakteristik oseanografi kompleks akibat pengaruh sirkulasi regional dan faktor musiman. Penelitian ini bertujuan untuk menganalisis variasi musiman, spasial, dan vertikal suhu serta salinitas di Teluk Tomini sepanjang tahun 2020 dengan menggunakan data reanalisis oseanografi dari produk Copernicus Marine Environment Monitoring Service (CMEMS) yang memiliki resolusi spasial 0,083 dan 50 lapisan vertikal. Analisis dilakukan terhadap distribusi suhu dan salinitas permukaan, penampang vertikal sepanjang lintang 0 antara 120125BT, serta profil vertikal pada tiga titik pengamatan (121BT, 123BT, dan 125BT). Hasil menunjukkan bahwa suhu permukaan laut (SPL) mencapai nilai maksimum 30C pada musim peralihan I, dan minimum 28C pada musim timur. Distribusi salinitas memperlihatkan gradasi secara zonal, dengan nilai yang lebih tinggi di bagian timur (34,5 PSU) akibat intrusi massa air asin dari Laut Banda dan Laut Maluku. Secara vertikal, terdapat stratifikasi termohalin yang mencolok hingga kedalaman 100 m, dengan kolom air yang lebih homogen di wilayah timur. Arus permukaan memainkan peran penting dalam membentuk distribusi spasial parameter-parameter tersebut. Penelitian ini menegaskan pentingnya pengaruh dinamika musiman dan intrusi regional terhadap struktur termohalin di Teluk Tomini. Temuan ini memberikan dasar penting bagi pemahaman lebih lanjut mengenai proses oseanografi fisis serta implikasinya terhadap ekosistem laut dan perencanaan pengelolaan sumber daya perikanan di wilayah ini.
Estimasi Potensi dan Alokasi Sumber Daya Perikanan Demersal di Perairan Cilacap, Indonesia Hartono, Sugeng; Adiyanto, Fajar; Yuliardi, Amir Yarkhasy; Abdulrahman, Idris
Juvenil Vol 6, No 3: Agustus (2025)
Publisher : Department of Marine and Fisheries, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/juvenil.v6i3.31300

Abstract

ABSTRAKStudi ilmiah terkait potensi dan alokasi pemanfaatan sumber daya perikanan demersal di Perairan Cilacap belum pernah dilakukan. Oleh karenanya, penelitian bertujuan menentukan tangkapan lestari maksimum atau Maximum Sustainable Yield (MSY) untuk mengkaji potensinya. Adapun alokasi pemanfaatannya ditentukan berdasarkan analisis tangkapan yang dibolehkan atau Total Allowable Catch (TAC). Data sekunder dikumpulkan untuk kebutuhan analisis yang berupa data jumlah tangkapan dan jumlah usaha penangkapan yang bersumber dari PPS Cilacap dan Dinas Perikanan Kabupaten Cilacap. Selanjutnya, kajian estimasi potensi dilakukan dengan menggunakan Rumus Surplus Produksi Gordon-Schaefer. Ada tujuh alat tangkap yang digunakan nelayan untuk memanfaatkan sumber daya ikan demersal di Perairan Cilacap. Hasil tangkapannya terdiri atas 64 jenis ikan demersal yang dapat dibagi menjadi dua kelompok, yaitu Osteichthyes (35 jenis) dan Chondrichthyes (29 jenis). Perikanan demersal di Perairan Cilacap masih memiliki potensi untuk dimanfaatkan. Namun, ada banyak jenis ikan demersal yang harus diberi kesempatan untuk pulih agar populasinya dapat lestari. Setidaknya 21 ikan demersal dari masing-masing Osteichthyes dan Chondrichthyes masuk kategori tereksploitasi secara penuh dan berlebihan. Jenis ikan dari Osteichthyes meliputi Black pomfret, Silver pomfret Three lined rockcod, White spotted triggerfish, Indian halibu, Banded grunter, Black jew, Sin croaker, Triple tail, Red snapper, Largescaled terapon, Chacunda gizzard shad, Largehead hairtail, Common ponyfish, Giant trevally, Goatfish, Bluespot mullet, Bombay duck, Yellow pike conger, Flathead, dan Giant catfish. Sementara jenis ikan dari Chondrichthyes meliputi Tiger shark, Sharpnose sevengill shark, Silky shark, Gummy shark, Bigeye thresher, Dog fish, Sandbar shark, Blue shark, Spot tail shark, Spinner shark, Smalltooth thresher shark, Longfin mako, Shortfin mako, Guitarfishes, Wing skate, Giant manta ray, White spotted whipray, Japanese devilray, Round ribbontail ray, Bowmouth guitarfish, dan Leopard whipray. Penangkapan sumber daya ikan demersal selanjutnya di Perairan Cilacap harus dilakukan dengan mempertimbangkan aspek lingkungan dan biodiversitas, agar perikanannya berkelanjutan. Caranya meliputi pemeliharaan dan perbaikan ekosistem perairan serta pembatasan dan pemantauan jumlah tangkapan sumber daya ikan demersal yang dieksploitasi. Peningkatan kualitas kedua aspek dapat mempercepat resiliensi populasi masing-masing spesies.Kata Kunci: Perikanan demersal, status pemanfaatan, tangkapan lestari.   ABSTRACTScientific studies on the potential and allocation of demersal fishery resource utilization in Cilacap waters have not yet been conducted. Therefore, this study aims to determine the Maximum Sustainable Yield (MSY) to assess its potential. The allocation of utilization is determined based on the Total Allowable Catch (TAC) analysis. Secondary data were collected for the analysis, consisting of catch and fishing effort data obtained from Cilacap Fishing Port (PPS Cilacap) and the Cilacap District Fisheries Office. Subsequently, potential estimation was carried out using the Gordon–Schaefer Surplus Production Formula. There are seven fishing gears used by local fishers to exploit demersal fish resources in Cilacap Waters. The catches consist of 64 species of demersal fish, which can be divided into two groups, namely Osteichthyes (35 species) and Chondrichthyes (29 species). Demersal fisheries in Cilacap waters still have potential for further utilization. However, many demersal fish species need opportunities to recover in order to sustain their populations. At least 21 demersal fish species from both Osteichthyes and Chondrichthyes are classified as fully or overexploited. Species of Osteichthyes included black pomfret, silver pomfret three lined rockcod, white spotted triggerfish, Indian halibu, banded grunter, black jew, sin croaker, triple tail, red snapper, largescaled terapon, chacunda gizzard shad, largehead hairtail, common ponyfish, giant trevally, goatfish, bluespot mullet, bombay duck, yellow pike conger, flathead, and giant catfish. Meanwhile species of Chondrichthyes included tiger shark, sharpnose sevengill shark, silky shark, gummy shark, bigeye thresher, dog fish, sandbar shark, blue shark, spot tail shark, spinner shark, smalltooth thresher shark, longfin mako, shortfin mako, guitarfishes, wing skate, giant manta ray, white spotted whipray, Japanese devilray, round ribbontail ray, bowmouth guitarfish, and leopard whipray. Future fishing of demersal fish resources in Cilacap waters must be carried out with consideration for environmental and biodiversity aspects to ensure sustainable fisheries. Methods include maintaining and rehabilitating the aquatic ecosystem, as well as limiting and monitoring the catch size of exploited demersal fish resources. Improving the quality of these two aspects can accelerate the population resilience of each species.Keywords: Demersal fisheries, sustainable yield, utilisation status.
TEMPORAL AND DEPTH VARIATION OF SEISMIC PARAMETERS PRIOR TO MAJOR EARTHQUAKES IN PALU REGION, INDONESIA Rahmalia, Diah Ayu; Andinisari, Ratri; Tampubolon, Danastri Lintang Pitaloka; Aminuddin, Jamrud; Yuliardi, Amir Yarkhasy; Fadhilah, Firda Haifa
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 3 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i3.498

Abstract

The Palu region in Central Sulawesi is high tectonic activity area due to a subduction zone and major fault system, which resulted in high seismic intensity. The b value, as the seismic characteristic, is a valuable parameter for evaluating stress conditions and earthquake precursors. This study aimed to investigate the temporal and depth variations of the b-value in the Palu region. We observed earthquake distribution over 75 years from 1950 to 2025, which was obtained from the United States Geological Survey catalog. We applied the declustering analysis to isolate the mainshock events by using the space-time window method. We also conducted the magnitude completeness estimation and b-value calculation with ZMAP. This result showed that the average b-value was around 0.88, which was indicated as an intermediate level of seismic activity, influenced by subduction and the Palu-Koro Fault. Decreasing b-value was observed prior to the 1996 and 2018 earthquakes, followed by an increase in the parameter. This pattern exhibited stress accumulation and release, which was represented by the magnitude distribution. This lowering characteristic of b-value could be a long term precursor to major earthquakes. Furthermore, the depth variation of b-value revealed high values in the upper crust (0–10 km), a decrease around 20–30 km, and a secondary increase near 40 km, which corresponds to the Moho, as indicated by shear wave velocity profiles. These results provide insight into the crustal structure and seismic behavior in a tectonically complex and tsunami-prone region.
Sea Surface Temperature Trends (1993–2022) at the Central–West Java Border: Climate Change Indicator Hartono, Sugeng; Prayogo, Luhur Moekti; Nugroho, Agung Tri; Rahmalia, Diah Ayu; Sari, Ratna Juita; Yuliardi, Amir
Jurnal Ekologi, Masyarakat dan Sains Vol 6 No 2 (2025): Jul-Des 2025
Publisher : ECOTAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55448/j94d1w11

Abstract

This study analyzes the variability of sea surface temperature (SST) in the coastal waters of Cilacap and Pangandaran, South Java Sea, during the 1993–2022 period using satellite data from Marine Copernicus. The analysis covers long-term trends, interannual fluctuations, and seasonal patterns related to regional oceanographic dynamics such as ENSO and seasonal upwelling. The results show a warming trend of SST at 0.06 ± 0.02 °C per decade, indicating the influence of regional climate change. Interannual variability highlights significant cooling in 1997 (La Niña) and extreme warming in 1998 and 2010 (El Niño). Seasonal patterns reveal the highest SST from March to May during the west monsoon, and the lowest SST in August–September due to upwelling. Upwelling plays an important role in regulating sea temperatures and supporting biological productivity. These findings underscore the importance of SST monitoring for climate-adaptive marine resource management in the southern coastal region of Java.
Spatial and Temporal Variability of Mixed Layer Depth (MLD) in Eastern Indian Ocean (EIO): 1998-2020 Yuliardi, Amir Yarkhasy; Firdaus, Randi
Jurnal Ilmiah Perikanan dan Kelautan Vol. 16 No. 1 (2024): JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jipk.v16i1.44026

Abstract

Abstract Mixed Layer Depth (MLD) plays an important role in various aspects of oceanography. MLD has a characteristic parameter value that is uniform with depth. MLD has an important role for local, regional, and global phenomena. Indonesia, which is surrounded by the East Indian Ocean, will be directly influenced by the dynamics of MLD. This study aimed to analyze seasonal variability and MLD between years. Mixed layer depth data from the ARMOR3D Dataset Copernicus-Marine Environment Monitoring Service was used for MLD analysis with a threshold of 0.2oC for temperature. Wavelet analysis showed that MLD variability in the eastern Indian Ocean spans from intra-seasonal to interannual scales. Time series analysis showed a complex relationship between MLD and SST in the annual and interannual periods which indicates a different process. The MLD monthly climatology at point 90E, 0 showed the depth of mixed layers is deeper during the east monsoon (JJA-SON) ranging from 50-65 m compared to the west monsoon (DJF-MAM) which has a range of 20-40 m. Spatially the MLD in the south of the equator is deeper than in the north. Interannually, MLD is heavily influenced by the Indian Ocean Dipole. MLD depth is deeper in nIOD with a maximum depth in the range of 100 m compared to pIOD. MLD with maximum depth in the strong nIOD phase is around the equator and the pIOD phase is south of the equator. The study also showed that inter-annual variability in regions around the mainland showed a stronger response. Highlight Researh ARMOR3D data has fairly good accuracy as evidenced by data validation In general, EIO is influenced by intra-seasonal, seasonal and inter-annual variability The shallowing and deepening of the MLD are strongly correlated with the wind speed associated with the annual cycle IOD has a strong role in MLD which looks significantly different, especially when nIOD and pIOD
Water Mass and Indirect Estimation of Turbulent Mixing Based on Observational CTD Yoyo Data in Flores Sea Waters, Indonesia Harsono, Gentio; Yuliardi, Amir Yarkhasy; Wirasatriya , Anindya; Purwanto, Budi; Cabral, Mario
Jurnal Ilmiah Perikanan dan Kelautan Vol. 17 No. 2 (2025): JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jipk.v17i2.70809

Abstract

Graphical Abstract   Highlight Research Three distinct water layers were identified: surface (0-50 m), thermocline (50-180 m), and deep (>180 m). The thermocline layer is the most stable, with high Brunt-Väisälä frequency and low Thorpe displacement values. The highest energy dissipation rates were observed in the thermocline layer. Vertical diffusivity values were highest in the thermocline layer and decreased with depth.     Abstract The Flores Sea is on the western ITF trajectory connecting the Pacific and Indian oceans. Identification and quantification of turbulent mixing of water masses in the Flores Sea are essential for analyzing large-scale ocean circulation processes, including the circulation of the Indonesian ocean interior. However, direct estimations of turbulent mixing in the Flores Sea as a part of the ITF are underestimated. This research aims to determine water conditions, stratification, and water mass structures. This research used data obtained from the CTD instrument applying a Yoyo casting method deployed in March − April 2023. On the other hand, the Thorpe method was used to estimate turbulent vertical mixing based on the values ​​of energy dissipation and vertical diffusivity. The waters are stratified into three layers, mixed layer (1−50 m), thermocline layer (50−180 m), and deep layer (180−500 m). The CTD data showed the presence of a stable thermocline layer dominated by ITF water masses carrying water masses from the Pacific Ocean (North Pacific Intermediate Water (NPIW) and North Pacific Subtropical Water (NPSW)) from the western ITF path. The energy dissipation value obtained at the study site was about 3.36E-07 W Kg-1 and the vertical diffusivity value was approximately 5.25E-05 m2s-1. The thermocline layer showed a large energy dissipation value which was strongly associated with the friction of the ITF, suggesting that turbulent mixing in this region is primarily driven by the interaction of ITF water masses with the surrounding environment.
The amplitudes and phases of tidal constituents from Harmonic Analysis at two stations in the Gaspar Strait of Bangka Belitung Yuliardi, Amir Yarkhasy; Heltria, Septy; Taj, Kemal; Natih, Nyoman M N
Journal Omni-Akuatika Vol 18, No 1 (2022): Omni-Akuatika May
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2022.18.1.893

Abstract

The waters of the Bangka Belitung islands are shallow waters that are affected by tides. The tides in these waters originate from the propagation of the Natuna and Java Seas, so they have unique characteristics. This study aims to analyze the amplitude and phase difference at 2 stations representing Bangka and Belitung Islands with the final output of LAT and HAT information as marine cadastral recommendations at Tanjung Pesona and Tanjung Tinggi stations and safe depths for ports in PPN Sungailiat and PPN Tanjung Pandan. . Tidal data for 1 year with time intervals of 1 hour in 2015 were used to extract the harmonic components to determine the type of tide and calculate the tidal level at each station. The results obtained are 19 harmonic components with a diurnal tide type. The water level at Tanjung Pesona is higher than the high Tanjung, which is described by tidal levels with HAT 2.64 and 1.72 m. Safe depth of harbor pond. In the LAT condition (lowest recess), the water level at Tanjung Pesona station is above the Sungailiat PPN pool's maximum depth; on the other hand, the Tanjung Pandan PPN LAT is 0.44 m below the maximum depth of the port pool.Key Word: Bangka Belitung, chart datum, LAT, HAT, tidal level
Co-Authors Abdulrahman, Idris Achmad Yogi Pambudi Adiyanto, Fajar Agus Atmadipoera Akmala Dwi Nugraha Alan Frendy Koropitan Aminuddin, Jamrud Bimo Aji Widyantoro Budi Purwanto Cabral, Mario Denny Alberto Satrya Gumay Ester Restiana Endang Gelis Fadhilah, Firda Haifa Farhan Ramdhani Feni Nurkumala Firdaus, Randi Gentio Harsono Gentio Harsono I Gusti Bagus Wiksuana I Wayan Nurjaya Imalpen, Imalpen Indra Jaya Kentaro Ando Lauura Hermala Lerma Yuni Siagian Luhur Moekti Prayogo Luhur Prayogo, Luhur Manik, Agustina Sartika Yos Ekaristi Marita Ika Joesidawati Muhamad Gilang Arindra Putra Muhammad Hanif Napitupulu, Gandhi Neviaty Putri Zamani Noferdiman Nor Sa'adah Nor Sa’adah Nugroho, Agung Tri Nur Sukma, Raka Nyoman M N Natih Putra, Muhamad Rachman, Herlambang Aulia Rahmalia, Diah Ayu Raka Raka Nur Sukma Randi Firdaus Rastina, Rastina Ratri Andinisari Ratu Almira Kismawardhani Rizky Janatul Magwa Sa'adah, Nor Sari, Ratna Juita Septy Heltria Soma Somantri Spanton, Perdana Ixbal SUGENG HARTONO, SUGENG Sukma, Raka Suwarsih Taj, Kemal Tampubolon, Danastri Lintang Pitaloka Tri Hartanto Tri Prartono Try Al Tanto Wirasatriya , Anindya Yogaswara, Deny Yoppie Wulanda Zainul Hidayah