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All Journal JURNAL ILMIAH PLATAX ILMU KELAUTAN: Indonesian Journal of Marine Sciences BULETIN OSEANOGRAFI MARINA POSITRON Journal of Oceanography Jurnal Harpodon Borneo Jurnal Kelautan : Indonesian Journal of Marine Science and Technology Jurnal Kelautan Tropis JOIV : International Journal on Informatics Visualization Omni-Akuatika JURNAL ILMIAH GEOMATIKA Marine Research in Indonesia Jurnal Kelautan Nasional Jurnal Geologi Kelautan: Media Hasil Penelitian Geologi Kelautan Jurnal Riset Jakarta Jurnal HIDROPILAR Jurnal Chart Datum Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) Indonesian Journal of Oceanography ACROPORA: Jurnal Ilmu Kelautan dan Perikanan Papua PONGGAWA : Journal of Fisheries Socio-Economic Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Jurnal Hidrografi Indonesia Depik Jurnal Ilmu-Ilmu Perairan, Pesisir, dan Perikanan Journal of Fisheries & Marine
Widodo S Pranowo
Laboratorium Data Laut dan Pesisir, Pusat Penelitian dan Pengembangan Sumbedaya Laut dan Pesisir Kementerian Kelautan dan Perikanan, Jl. Pasir Putih Ancol Timur, Jakarta 14430
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Social Sciences

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Karakteristik Tinggi Gelombang Laut di Perairan Halmahera Utara dan Morotai pada Periode Waktu ENSO Tahun 2012-2021 Mudho, Hendrik Trio; Azies, Ibnu Abdul; Setiyadi, Johar; Kisnarti, Engki Andri; Pranowo, Widodo Setiyo
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.v28i1.25192

Abstract

North Halmahera and Morotai are strategic regions in the North Maluku Islands, Indonesia, rich in marine biodiversity and with great potential in the maritime, trade, and fisheries sectors. These regions serve as crucial routes for maritime transportation and regional trade, making accurate information about the physical conditions of the sea, particularly wave height, essential for ensuring the safety and security of shipping lanes. This study aims to analyze the impact of the El-Nino Southern Oscillation (ENSO) phenomenon on ocean wave heights in the waters of North Halmahera and Morotai during the period from 2012 to 2021. Additionally, the study measures the correlation between the Southern Oscillation Index (SOI) and Significant Wave Height (SWH). The data used in this study include wave data from the Marine Copernicus platform and SOI data obtained from http://www.bom.gov.au/climate/enso/soi/. Three observation stations were selected in the waters of North Halmahera and Morotai to monitor changes and variations in SWH during the ENSO phenomenon. A correlation analysis was conducted to determine the relationship between SOI values and SWH at each observation station. The results indicate that during the El-Nino phase, wave heights decreased significantly at several stations, particularly at stations 1 and 3, with a negative correlation between SOI and SWH. Conversely, during the La-Nina phase, wave heights increased, especially at stations 2 and 3, showing a stronger positive correlation. The relationship between SOI and SWH varied depending on location and time period. This study concludes that ENSO has a significant impact on the variation in wave heights in the waters of North Halmahera and Morotai. These findings are important for supporting maritime safety and managing maritime activities in the region.
Analisis Kejadian Banjir ROB di Provinsi Bengkulu Periode 2022-2024 Agustina, Lisa Asyifa; Lubis, Ashar Muda; Pranowo, Widodo Setiyo
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.v28i1.25833

Abstract

Bengkulu Province is one of the coastal areas prone to tidal flooding due to a combination of various oceanographic and meteorological factors such as tides, wind speed, rainfall, and sea wave height. This study aims to analyze the dominant factors causing tidal floods in Bengkulu Province during the period 2022-2024. Data on tidal flood events were obtained from BPBD and BPS reports of Bengkulu Province, as well as mass media sources. The analysis was conducted using wind data from the European Center for Medium Weather Forecast (ECMWF), rainfall data from the Meteorology, Climatology and Geophysics Agency (BMKG), and tidal prediction data from the Geospatial Information Agency (BIG). The results show that during the west season, tidal floods are triggered by strong westerly winds due to the West Monsoon, full tides, and moderate to high rainfall, as in the events of February 4-6, 2022 and January 26-27, 2023. During the east monsoon, tidal floods are caused by steady southeast winds and high tides due to the East Monsoon, despite low rainfall, as in the events of July 30, 2023 and August 3-5, 2023. In the transitional season, tidal floods tend to be influenced by a combination of full tides, moderate winds and light to moderate rainfall, such as on May 14-15, 2022 and October 16-17, 2024. Factors such as tropical cyclone activity and the Indian Ocean Dipole (IOD) also contribute significantly to the increased risk of tidal flooding, particularly strengthening winds and increasing rainfall in certain seasons.  Provinsi Bengkulu merupakan salah satu wilayah pesisir yang rawan terkena banjir rob akibat kombinasi berbagai faktor oseanografis dan meteorologis seperti pasang surut, kecepatan angin, curah hujan, dan tinggi gelombang laut. Penelitian ini bertujuan untuk menganalisis faktor dominan penyebab banjir rob di Provinsi Bengkulu selama periode 2022–2024. Data kejadian banjir rob diperoleh dari laporan BPBD dan BPS Provinsi Bengkulu, serta sumber media massa. Analisis dilakukan dengan menggunakan data angin dari European Center for Medium Weather Forecast (ECMWF), data curah hujan dari Badan Meteorologi, Klimatologi, dan Geofisika (BMKG), serta data prediksi pasang surut dari Badan Informasi Geospasial (BIG). Hasil penelitian menunjukkan bahwa pada musim barat, banjir rob dipicu oleh angin barat yang kuat akibat Monsun Barat, pasang purnama, dan curah hujan sedang hingga tinggi, seperti pada kejadian 4–6 Februari 2022 dan 26–27 Januari 2023. Selama musim timur, banjir rob disebabkan oleh angin tenggara yang stabil dan gelombang tinggi akibat Monsun Timur, meskipun curah hujan rendah, seperti pada kejadian 30 Juli 2023 dan 3–5 Agustus 2023. Pada musim peralihan, banjir rob cenderung dipengaruhi oleh kombinasi pasang purnama, angin sedang, dan curah hujan ringan hingga sedang, seperti pada 14–15 Mei 2022 dan 16–17 Oktober 2024. Faktor-faktor seperti aktivitas tropikal siklon dan Indian Ocean Dipole (IOD) juga memberikan kontribusi signifikan terhadap peningkatan risiko banjir rob, terutama memperkuat angin dan meningkatkan curah hujan pada musim tertentu.
Relationship between water mass characters to Sound velocity profiler (SVP) in the Sulawesi Sea Agustinus, Agustinus; Pranowo, Widodo Setiyo; Manik, Henry Munandar; Rahmatullah, Amri; Aji, Tri
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 12, No 3 (2023): DECEMBER 2023
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.12.3.32296

Abstract

The Sulawesi Sea is the western entry point of the Indonesian throughflow, which brings water masses from the Pacific Ocean. This study aims to describe the relationship between water mass characteristics and Sound Velocity Profiler (SVP) in the Sulawesi Sea based on Marine Copernicus data from 2022 with a depth of up to 500 meters. Temperature and Salinity data were used to obtain water mass types from the Tpot-S diagram based on Emmery's classification and Sound Velocity Profiler (SVP) based on the Medwin empirical equation. The temperature, salinity, and SVP data were visualized using ODV 5.6.2 software. The data processing results have identified several water mass characteristics that are believed to be influenced by the Eastern North Pacific Central Water (ENPCW) water mass type found at depths ranging from 130 to 318 meters, Western North Pacific Central Water (WNPCW) water mass found at depths ranging from 130 to 500 meters, Eastern South Pacific Central Water (ESPCW) water mass found at depths ranging from 92 to 453 meters, and Western South Pacific Central Water (WSPCW) water mass found at depths ranging from 130 to 500 meters. The ENPCW water mass type on average has a smaller difference in SVP values compared to the WNPCW water mass type. Meanwhile, the ESPCW water mass type on average has a greater difference in SVP values compared to the WSPCW water mass type. The results indicate a positive relationship between temperature and SVP, meaning that the higher the temperature, the higher the SVP. However, there is a negative relationship between salinity and SVP, meaning that the higher the salinity, the lower the SVP.Keywords:Water MassTemperatureSalinitySound VelocitySulawesi Sea
Analysis of Wind Characteristics and Sea Surface Elevation Dynamics in Coastal Waters of Mantang Island, Bintan Regency, Indonesia Fa'u, Yosepine Cinta Tyas Gusti; Pranowo, Widodo Setiyo; Suhana, Mario Putra; Mujiasih, Subekti; Hatmaja, Rahaden Bagas; Ratnawati, Herlina Ika; Apdillah, Dony
Buletin Oseanografi Marina Vol 14, No 2 (2025): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v14i2.70748

Abstract

Geographically, Mantang Island is situated between the Malacca Strait, Natuna Sea, and Karimata Strait, and is exposed to the open sea, which influences the oceanographic dynamics of the region. The island’s residents are heavily dependent on the sea for their livelihoods, making wind and sea tides crucial for meeting their daily needs. Consequently, this study aimed to measure wind data and sea surface elevation over a 30-day period, with the results visualized using a wind rose diagram. The specific objectives were: 1) to calculate harmonic constants using both the Least Squares and Admiralty methods to obtain FormZahl numbers, 2) to determine the characteristics of sea surface elevation based on each method, and 3) to analyze the relationship between sea surface elevation and wind speed. The findings revealed that the wind in the waters surrounding Mantang Island was primarily influenced by the monsoon, blowing from the west with maximum speeds ranging from 5.70 to 8.80 m/s. Each calculation method produced varying values for sea surface elevation, including Zo, HHWL, LLWL, MHWL, and MLWL, with respective values of 11.99 m, 15.9 m, 8 m, 17.9 m, and 6 m. FormZahl number calculations yielded values of 1.25 and 1.03 using the Least Squares and Admiralty methods, respectively. Despite the differences in the results, both methods indicated a mixed semi-diurnal tidal pattern. To examine the relationship between wind and sea surface elevation, a 6th-order polynomial regression analysis was performed. The analysis revealed a weak correlation, with a coefficient of determination (R²) of 0.21 and a Root Mean Square Error (RMSE) of 0.30. These values suggest that the model’s predictions were relatively close to actual field conditions. 
Perbandingan Data Pasang Surut, Arus, dan Angin dengan Prediksi pada Musim Peralihan Kedua di Laut Timor Tahun 2023: Comparison Between Tide, Current, and Wind Data with Prediction During Second Monsoon Transition in Timor Sea 2023 Dharma, Candrasa Surya; Rizki Khair, Deirus; Abimanyu, Alin; Fadhilah, Affan; Budi Sukoco, Nawanto; Arochim; Ronaldy, Tomy; Sugiyanto, Dedi; Setiyo Pranowo, Widodo; Herho, Sandy; Yusron, Ahmad; Alfahmi, Furqon; Fahim, Akhmad; Andika; Cahyono, Sigit
Jurnal Hidrografi Indonesia Vol 7 No 1 (2025): Jurnal hidrografi Indonesia
Publisher : Pusat Hidro-Oseanografi TNI Angkatan Laut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62703/jhi.v7i1.156

Abstract

Laut Timor memiliki peran geostrategis yang sangat tinggi bagi negara Indonesia dan Australia. Latihan survey bersama perdana antara kedua negara diberi nama Coordinated Hydrography Survey Exercise (CHSE) diselenggarakan pada tahun 2023. CHSE dilaksanakan dengan menggerakkan kapal riset perang KRI Spica milik TNI-AL Indonesia dan HMS Leeuwin milik Royal Navy Australia, yang masing-masing melakukan survey hidro-oseanografi dan meteorologi di wilayah teritorialnya. Data arus dan angin dari hasil survey kemudian dibandingkan dengan data sekunder Copernicus, sedangkan untuk data angin terhadap prediksi BMKG. Tidak terjadi kemunculan siklon selama kegiatan latihan, Kondisi batimetri di Perairan Laut Timor dalam penelitian ini bervariasi dari kedalaman 16,8 s.d. 218,7meter, dengan luas area sebesar 302NM2. Sirkulasi arus diukur menggunakan underway vessel mounted ADCP hingga kedalaman 40 meter, dengan interval rekaman data bervariasi antara 1 menit sampai 45 menit. Selain itu dipasang pula fix mooring current meter pada satu stasiun tetap. Hasil pengukuran menunjukkan pola sirkulasi arus dominan bergerak antara Timur Laut dan Barat Daya, dengan pola keseragaman secara vertikal. Kecepatan arus maksimum 0,273m/s, dan minimum 0,005m/s ke arah Barat Daya. Hal ini sejalan dengan data klimatologis yang menunjukkan pola arus dominan menuju ke Barat Daya dengan kecepatan 0,1 – 0,5 knot. Pola sirkulasi tersebut menunjukkan bahwa Laut Timor dipengaruhi oleh Indonesian Throughflow (ITF), dengan 30% dari variabilitasnya dipengaruhi oleh siklus musiman dari angin monsoon. Laut Timor, pada lapisan kolom airnya, mendapatkan pengaruh lokal dari gelombang kelvin pada kedalaman di bawah 600 meter, dilapisan yang lebih dangkal, arus dibangkitkan oleh kopling siklus gaya pasang surut diurnal dari Laut Banda, semidiurnal dari Samudera Hindia, dan siklus musiman dari gaya angin monsoon.
Relationship between water mass characters to Sound velocity profiler (SVP) in the Sulawesi Sea Agustinus, Agustinus; Pranowo, Widodo Setiyo; Manik, Henry Munandar; Rahmatullah, Amri; Aji, Tri
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 12, No 3 (2023): DECEMBER 2023
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.12.3.32296

Abstract

The Sulawesi Sea is the western entry point of the Indonesian throughflow, which brings water masses from the Pacific Ocean. This study aims to describe the relationship between water mass characteristics and Sound Velocity Profiler (SVP) in the Sulawesi Sea based on Marine Copernicus data from 2022 with a depth of up to 500 meters. Temperature and Salinity data were used to obtain water mass types from the Tpot-S diagram based on Emmery's classification and Sound Velocity Profiler (SVP) based on the Medwin empirical equation. The temperature, salinity, and SVP data were visualized using ODV 5.6.2 software. The data processing results have identified several water mass characteristics that are believed to be influenced by the Eastern North Pacific Central Water (ENPCW) water mass type found at depths ranging from 130 to 318 meters, Western North Pacific Central Water (WNPCW) water mass found at depths ranging from 130 to 500 meters, Eastern South Pacific Central Water (ESPCW) water mass found at depths ranging from 92 to 453 meters, and Western South Pacific Central Water (WSPCW) water mass found at depths ranging from 130 to 500 meters. The ENPCW water mass type on average has a smaller difference in SVP values compared to the WNPCW water mass type. Meanwhile, the ESPCW water mass type on average has a greater difference in SVP values compared to the WSPCW water mass type. The results indicate a positive relationship between temperature and SVP, meaning that the higher the temperature, the higher the SVP. However, there is a negative relationship between salinity and SVP, meaning that the higher the salinity, the lower the SVP.Keywords:Water MassTemperatureSalinitySound VelocitySulawesi Sea
Analisis Co Tidal Chart dan Perambatan Pasang Surut di Perairan Indonesia Bagian Barat Lukman, Annisa Aulia; Sugianto, Denny Nugroho; Pranowo, Widodo Setiyo; Wirasatriya, Anindya; Hariyadi, Hariyadi
Indonesian Journal of Oceanography Vol 7, No 2 (2025): Indonesian Journal of Oceanography
Publisher : University of Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijoce.v7i2.26802

Abstract

Pembuatan co-tidal chart konstanta harmonik pasang surut ini dilakukan dengan tujuan mengetahui karakteristik pasang surut di wilayah Indonesia bagian barat. Co-Tidal chart memetakan sebaran nilai fase pasang surut di suatu wilayah. Wilayah yang dipetakan adalah perairan Indonesia bagian barat. Wilayah ini dipilih guna melihat pengaruh Samudera Hindia dan Samudera Pasifik terhadap karakteristik dan kondisi pasang surut di wilayah Indonesia bagian barat. Pembuatan peta pasang surut menggunakan data model FES2014. Pada penelitian ini mengolah 9 konstanta pasang surut yaitu K1, O1, P1, K2, M2, S2, N2, M4 dan MS4, dalam pembuatan peta pasang surut. Hasil analisis penelitian ini menunjukkan bahwa konstanta harian tunggal yang terdiri atas K1, O1, P1 memiliki gelombang pasut yang menjalar dari wilayah Samudera Pasifik khususnya Laut China Selatan dan Teluk Thailand. Untuk konstanta harian ganda yaitu K2, M2, S2, N2 menjalar dari wilayah Samudera Hindia. Sedangkan konstanta M4 dan MS4, terlihat menjalar dari wilayah perairan dangkal dengan sebaran nilai yang rendah. 
Variabilitas Bulanan Thermal front di Wilayah Pengelolaan Perikanan Republik Indonesia 714 (Laut Banda) Lukman, Annisa Aulia; Napitupulu, Gandhi; Tarya, Ayi; Pranowo, Widodo; Hatmaja, Rahaden Bagas; Habibullah, Ahmad Dhuha
JURNAL GEOLOGI KELAUTAN Vol 23, No 1 (2025)
Publisher : Pusat Penelitian dan Pengembangan Geologi Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/jgk.23.1.2025.897

Abstract

Penelitian tentang sebaran spasial thermal front di perairan Indonesia pada dasarnya telah banyak dilakukan. Namun, kajian yang secara khusus menganalisis dinamika thermal front akibat arus sejajar pantai, yang memicu fenomena Ekman pumping, dan arus eddy masih terbatas. Arus sejajar pantai dapat memicu Ekman pumping, sedangkan Ekman pumping dan eddy mesoskal dapat menyebabkan naiknya massa air bersuhu rendah dari lapisan bawah ke permukaan laut. Proses ini memicu pembentukan thermal front, yang banyak ditemukan di Laut Banda. Penelitian ini bertujuan untuk menganalisis variabilitas bulanan dinamika thermal front di Laut Banda yang dipengaruhi oleh arus sejajar pantai dan eddy. Data yang digunakan dalam penelitian ini adalah Suhu Permukaan Laut (SPL) dari tahun 2006 hingga 2020. Hasil penelitian menunjukkan bahwa rata-rata kejadian thermal front yang terdeteksi adalah sebanyak 1.385 kejadian per bulan berdasarkan jumlah piksel, dan 17 kejadian berdasarkan jumlah poligon. Jumlah maksimum kejadian thermal front terjadi pada bulan Desember (2.416 kejadian), dan jumlah minimum terjadi pada bulan November (883 kejadian). Berdasarkan hasil penelitian ditemukan bahwa eddy antisiklonik (AE) dan eddy siklonik (CE), terjadi dengan durasi rata-rata 11,419 hari untuk AE dan 11,812 hari untuk CE. Kedua fenomena ini berkaitan dengan penurunan SPL, peningkatan konsentrasi klorofil-a permukaan laut, serta penurunan tinggi muka laut, yang menunjukkan terjadinya 
Hubungan Arus Permukaan Laut Dan Angin Monsun Peralihan II di Teluk Jakarta : The Interaction Between Surface Currents and The Second Transitional Monsoon Winds in Jakarta Bay Coastal Waters Febriana, Azizah; Fernandhy, Hangga; Mustika Alam, Tasdik; Setiyo Pranowo, Widodo
Jurnal Riset Jakarta Vol. 17 No. 2 (2024): Jurnal Riset Jakarta
Publisher : Dewan Riset Daerah (DRD) Provinsi Daerah Khusus Ibukota (DKI) Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37439/jurnaldrd.v17i2.110

Abstract

Teluk Jakarta merupakan sebuah teluk di pesisir utara Pulau Jawa yang berfungsi sebagai kawasan penting bagi perikanan, pelabuhan, dan kegiatan ekonomi lainnya. Penelitian ini bertujuan untuk menganalisis hubungan antara angin monsun Peralihan II dan arus permukaan laut di wilayah Teluk Jakarta pada puncak musim Peralihan II yang terjadi pada bulan September-Oktober 2024. Berdasarkan data yang diperoleh dari mareogram angin dan arus permukaan laut di beberapa wilayah, hasil analisis menunjukkan bahwa arah angin dominan bergerak dari Timur ke Barat, yang mempengaruhi arah gerakan arus permukaan laut. Kecepatan angin maksimal yang tercatat bervariasi antara 6,15 m/s hingga 7,21 m/s, sementara kecepatan arus permukaan laut mencapai kecepatan maksimal 0,14 m/s di wilayah utara. Hasil analisis lebih lanjut menunjukkan adanya hubungan positif antara kecepatan angin dan kecepatan arus, meskipun hubungan ini dipengaruhi oleh faktor-faktor lokal seperti kedalaman perairan, topografi wilayah, serta interaksi dengan fenomena gelombang dan pasang surut. Penelitian ini menyimpulkan bahwa meskipun angin Peralihan II berperan dalam membentuk pola arus permukaan laut, faktor-faktor lingkungan lainnya turut memperkaya kompleksitas dinamika arus di berbagai wilayah Teluk Jakarta.
Studi Karakteristik Massa Air Pada Lapisan Termoklin Di Selat Makassar Supriyanto, Taufiq; Apriyanto, I Nengah Putra; Irwanto, Bambang; Adriyanto, Agus; Purwanto, Budi; Agustinus, Agustinus; Pranowo, Widodo S
Jurnal Kelautan Vol 18, No 2: Agustus (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v18i2.29829

Abstract

ABSTRAKSelat Makassar merupakan jalur strategis antara Kalimantan dan Sulawesi yang menghubungkan Samudera Pasifik dan Samudera Hindia. Selain menjadi rute pelayaran internasional penting, wilayah ini juga rawan terhadap ancaman keamanan seperti ranjau laut dan drone bawah air, sehingga membutuhkan pengawasan ketat dan kerja sama lintas sektor. Penelitian ini bertujuan untuk mengeksplorasi karakteristik kolom air, khususnya lapisan termoklin yang berpotensi menjadi wilayah persembunyian (Shadowzone), pada kedalaman 0–300 meter di choke point Selat Makassar. Data suhu dan salinitas terhadap kedalaman diperoleh dari pengukuran argo float selama periode Oktober 2017 hingga Januari 2018. Perhitungan kecepatan rambat suara dilakukan menggunakan persamaan empiris Medwin. Lapisan termoklin diidentifikasi melalui gradien suhu sebesar 0,1°C per meter. Visualisasi dan analisis data dilakukan menggunakan perangkat lunak ODV 5.6.2. Hasil penelitian menunjukkan bahwa lapisan termoklin berada pada kedalaman 86,4–158,1 meter, dengan suhu 16,79–27,98°C, salinitas 33,75–34,67‰, dan kecepatan suara 1514,19–1541,95 m/s. Ketebalan lapisan sekitar 72 meter ini diindikasikan sebagai Shadowzone yang potensial menjadi lokasi persembunyian objek bawah laut.Kata Kunci: Selat Makassar, Lapisan termoklin, Suhu, Salinitas, Kecepatan SuaraABSTRACTThe Makassar Strait is a strategic route between Kalimantan and Sulawesi that connects the Pacific Ocean and the Indian Ocean. In addition to being an important international shipping route, this area is also prone to security threats such as sea mines and underwater drones, requiring strict surveillance and cross-sector cooperation. This study aims to explore the characteristics of the water column, particularly the thermocline layer that has the potential to become a hiding place (Shadowzone), at a depth of 0–300 metres at the Makassar Strait choke point. Temperature and salinity data at different depths were obtained from argofloat measurements during the period from October 2017 to January 2018. Sound propagation velocity calculations were performed using the Medwin empirical equation. The thermocline layer was identified through a temperature gradient of 0.1°C per metre. Data visualisation and analysis were conducted using ODV 5.6.2 software. The results of the study show that the thermocline layer is located at a depth of 86.4–158.1 metres, with a temperature of 16.79–27.98°C, salinity of 33.75–34.67‰, and sound velocity of 1514.19–1541.95 m/s. The thickness of this layer, approximately 72 metres, is indicated as a potential shadow zone for the hiding of underwater objects.Keywords: Makassar Strait, Thermocline Layer, Temperature, Salinity, Sound Velocity 
Co-Authors ., Kamija ., Ramawijaya A. Adi, Rizky ABIMANYU, ALIN Achmad Noerkhaerin Putra Adrianto, D Adrianto, Dian Adriyanto, Agus Adventari, Tara Agung Bimantara, Agung Agung Kurniawan Agung Kurniawan Agustina, Lisa Asyifa Agustinus Agustinus Ahmad Yusron, Ahmad Aida Sartimbul Akbar, Agya Muhammad Al Hakim, Buddin Alan Frendy Koropitan Alfahmi, Furqon Andi Rahman ANDIKA Anggara, Purry Djati Anggriawan Maydwika, Dhedy Anindya Wirasatriya Apriyanto, I Nengah Putra Aprizon Putra Arifiyanto Arifiyanto, Arifiyanto Armansyah, Dodik Arochim Ashar Muda Lubis Asmoro, Nuki Widi Asryanto, Asryanto Awaluddin Awaluddin Ayi Tarya Ayuningsih, Tarisa Lestari Azhari, Ferian Azhari, Ferian Azhari azies, ibnu Azies, Ibnu A. Azies, Ibnu Abdul Budi Purwanto Budi Sukoco, Nawanto Budi, Nawanto Cahyono, Sigit Candrasa Choirul Umam, Choirul Christiani Somba, Devaky D. Cahyadi, Ferry D. Puspita, Candra Defri Yona Denny Nugroho Sugianto Dewantono, L Dharma, Candrasa Surya Dirgantara, Octav Djati Anggara, Purry Dony Apdillah Dwi Haryo Ismunarti Dwi Heriyanto E. Diputra, Ardian Egaputra, Afif Arwin Eka Putra, I Wayan Sumardana Elis Indrayanti Engki Andri Kisnarti Erfan Rohadi Fa'u, Yosepine Cinta Tyas Gusti Fadhilah, Affan Fahim, Akhmad Faradiva Eka Putri, Destiana Fathurrahman K., M. Febriana, Azizah Feni Iranawati, Feni Fernandhy, Hangga Ferry Setiawan Fuad, M. Arif Zainul Gde Raka Angga Kartika Gentio Harsono Gultom, Feri Habibullah, Ahmad Dhuha Hanafi, Rahmat Handoko, Dadang Harahap, Syawaluddin Hariyadi, Hariyadi Harmoko, Faiza Hascaryo, Anom Hatmaja, Rahaden Bagas Hawati, Hawati Hendiari, I Gusti Ayu Diah Hendra Hendra Hendrawan Setiadi, Hendrawan Henry Munandar Manik Herho, Sandy Herlina Ika Ratnawati, Herlina Ika Herunadi, Bambang Heryoso Setiyono Hidayat , Heru Syamsul Hirmawan, Agus Husrin, Semeidi I Made Jiwa Astika I Wayan Arthana Ilham, Ilham Imam Fatoni, Khoirol Indra Kusuma, Yohanes Irwanto, Bambang Iskandar Izzaturrahim, Muh. Hafizh Jantarto, Dwi Jatmiko, Bagus Jusup Suprijanto Kamija, Kamija Kencono, Dolok Joko Khair, Deirus Rizki Koswara Koswara, Koswara Krisnanto, Wahyu Fajar Kurniawan, Edityo Dwi Kurniawan, Muhammad Azis Kusuma, Bayu Hendra Kusumah, Gunardi Kusumawardani, Anastasia R. T. D. L. Tobing, Christian Latifah, Laila Lelalette, Johanis Dominggus Lukman Hakim Lukman, Annisa Aulia Lumban-Gaol, Yustisi M. Furqon Azis Ismail Madawanto, Yanu Malik, Kurnia Mardi Wibowo Mario Putra Suhana Martin, Toufiq Melissa Bonauli, Melissa Monang S, Sahat Monang, Sahat Monang. S, Sahat Mudho, Hendrik Trio Muhammad Azis MUHAMMAD BAKRI Muhammad Helmi Muhammad Ramdhan Muhammad Zainuri Mulia Purba Mutiara Syah Putri, Khansa Napitupulu, Gandhi Novi Susetyo Adi, Novi Susetyo Nur Aini, Fikri Nurjumanis, Amanda Nurul Khakim Nurul Muslihah Oktavianto, Eka Arif Prasetyo, Irawan Pratama , Brachmantiyo Rachman Prihantoro, Andi Exyas Puliwarna, Tunggul Purba, Noir Purmono, Purmono Purwanto Purwanto Putra, I Wayan Sumardana Eka Putra, Iska Rahayu, Shafira Primasty Rahmatullah, Amri Ratnasari, Syarifah Leila Rawi, Sofyan Restu Wardani Retri Harito, Rusito Rikha Bramawanto Riyadi, Nur Rizki Khair, Deirus Ronaldy, Tomy Rosidah - Rudiastuti, Aninda W. Ryanto, Fauzan Novan Sabhan Sabhan Santosa, Yoyok Nurkaya Santoso, Agus Iwan Setiyadi, Johar Setyawan, Fahreza Okta Silalahi, Florence E. S. Solly Aryza Subekti Mujiasih Sugiyanto, Dedi Sukoco, N. Budi Sukoco, Nawanto Budi Sumardana, I Wayan Eka Sunarto Sunarto Sunaryo Sunaryo Supriatna Supriatna Supriyant, Taufiq Supriyanto, Taufiq Supriyono Susanto, Raden Dwi Susilo, Iwan Hendra Sutarto Sutarto Syarifah Hikmah Julinda Sari Tangeb, I. Gede Yussupiartha Sas Tanto, Try Al Tasdik Mustika Alam, Tasdik Mustika Tinus, Agus Tisiana Dwi K, Anastasia Rita Tonny Adam Theoyana Tri Aji Triatmojo, Yudha Putra Triono, Yoyok Umam, Choirul Umam Velly Asvaliantina, Velly Viv Djanat Prasita Wahyu, Inge Eka Nur Wibowo , Yusuf Wicaksono, Krias Ridho Widisanto, Harso Widjo Kongko, Widjo Widodo, Kukuh Suryo Winata, Victor Adi Winona Abigail Wirasantosa, Sugiarta Wisha, Ulung Jantama Yasra, Ezikri Yosef Prihanto, Yosef Yulianto Yulianto Yusuf Awaludin, Muhammad YUSUF WIBOWO