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INDONESIA
BULETIN OSEANOGRAFI MARINA
Published by Universitas Diponegoro
ISSN : 20893507     EISSN : 25500015     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
Buletin Oseanografi Marina (BULOMA) adalah jurnal yang menginformasikan hasil penelitian dan telaah pustaka tentang aspek Oseanografi, Ilmu Kelautan, Biologi Laut, Geologi Laut, Dinamika Laut dan Samudera, Estuari, Kajian Enerji Alternatif, Mitigasi Bencana, Sumberdaya Alam Pesisir, Laut dan Samudera.
Arjuna Subject : -
Articles 405 Documents
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Pengaruh Suhu Permukaan Laut di Laut Natuna Utara Terhadap Variasi Konvektif dan Hujan Diurnal di Sumatra Selama Onset El Niño Cintya Azahra Putri; Agung Setyo Sasongko; Erma Yulihastin; Ferry Dwi Cahyadi; Risyanto Risyanto; Rahaden Bagas Hatmaja; Sanaullah Zehri
Buletin Oseanografi Marina Vol 15, No 1 (2026): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v15i1.67416

Abstract

Penelitian ini bertujuan menganalisis pengaruh variasi suhu permukaan laut (SPL) di Laut Natuna Utara (LNU) dan distribusi temporal dan spasial pada pola curah hujan harian di daratan Sumatra Tengah selama periode El Niño pada 2018 dan 2023. Penyelidikan itu berlangsung selama tiga bulan, dari November 2023 hingga Januari 2024. Studi ini bertujuan untuk menginvestigasi perubahan dalam pola hujan diurnal yang disebabkan oleh pengaruh SPL di LNU ketika El Niño dimulai, dan distribusi konvektif di Sumatra bagian tengah. Data yang digunakan adalah data satelit dari berbagai sumber yang diproses dalam bentuk spasial, untuk melihat perubahan signifikan secara deskriptif kualitatif, yaitu data hujan dari Global Satellite Measurement of Precipitation (GSMaP) Gauge-Calibrated V6 dengan resolusi spasial 0,1 ̊ dan temporal 1 jam. Daerah Sumatra Tengah telah dianalisis lebih lanjut untuk perubahan pola hujan puncak harian, yaitu Riau dan Jambi. Riau sendiri tidak memiliki perubahan pola hujan diurnal maupun penurunan puncak sedangkan Jambi memiliki tiga variasi pada waktu penurunan intensitas hujan. Terjadinya pemanasan SPL di LNU menyebabkan perubahan pola hujan sore hari menjadi pagi hari terjadi lebih sering terutama pada periode 2023 daripada pada 2018. Pada tahun 2023, SPL di Laut Natuna Utara mendingin, meskipun begitu pengaruh musim membuat pola hujan yang dihasilkan memiliki indikasi hujan yang cukup bervariasi. Selain itu, pengaruh musim timur dan barat selama El Niño dimulai merupakan salah satu faktor utama dalam mengubah pola curah hujan harian.   The study aims to analyze the influence of sea surface temperature variations (SST) in the Northern Natuna Sea (NNS) and temporal and spatial distribution on daily rainfall patterns on the mainland of Central Sumatra during the El Niño period in 2018 and 2023. The investigation lasted for three months, from November 2023 to January 2024. The study aims to investigate changes in the diurnal rain patterns caused by the influence of SST in the NNS when El Niño began, and the convective distribution in central Sumatra. The data used is satellite data from various sources processed in spatial form, to see significant qualitatively descriptive changes, namely rainfall data from the Global Satellite Measurement of Precipitation (GSMaP) Gauge-Calibrated V6 with a space resolution of 0.1 ̊ and 1 hour temporal. The region of Central Sumatra has been further analyzed for changes in daily peak rain patterns, namely Riau and Jambi. Riau itself has no changes in diurnal rain pattern nor peak decreases while Jambi has three variations at times of decrease in rain intensity. The occurrence of SST warming in NNS caused the change of rain patterns in the afternoon to the morning occurred more often especially in the period of 2023 than in 2018. In 2023, SPL in the NNS cooled, although then the influence of the season made the resulting rain pattern have indications of rain quite varied. In addition, the influence of the eastern and western seasons during the El Niño onset was one of the key factors in changing the daily rainfall patterns.
Coral Reef Condition in the Utilization Zone of Menjangan Kecil Island Karimunjawa Islands Septya Anggoro Putri; Muhammad Zainudin; Riyanti Riyanti
Buletin Oseanografi Marina Vol 15, No 1 (2026): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v15i1.74216

Abstract

Karimunjawa Islands is a national park that has abundant natural resource potential and high biodiversity, especially in coral reef ecosystems. However, the utilization of coral reef ecosystems for marine tourism development has a negative impact on the condition of coral reefs. This study aims to determine the physical and chemical conditions of waters, the growth forms of coral reefs, and the condition of coral reefs in the marine tourism utilization zone of Menjangan Kecil Island, Karimunjawa Islands. A survey method was used for this research. Data were collected at four stations using the Underwater Photo Transect (UPT) method and analyzed using CPCe software. The results showed that the physical and chemical conditions of the water, including temperature, brightness, and pH, were still suitable to support the survival and growth of corals. There were 13 types of coral growth forms found, including Acropora Branching (ACB), Acropora Digitate (ACD), Acropora Encrusting (ACE), Acropora Submassive (ACS), Acropora Tabulate (ACT), Coral Branching (CB), Coral Encrusting (CE), Coral Foliose (CF), Coral Heliopora (CHL), Coral Massive (CM), Coral Millepora (CME), Coral Mushroom (CMR), and Coral Submassive (CS). The highest percentage of hard coral cover was found at station 2, with a value of 84.17%, and the lowest was found at station 3, with a value of 62.01%. Overall, the condition of coral reefs in the marine tourism utilization zone of Menjangan Kecil Island was in the high category. 
Coastal Marine Heatwaves Detection in Java Using Satellite and In-situ Willy Wulansari; Sugeng Widada; Lili Maslukah; Anindya Wirasatriya; Titi Sari
Buletin Oseanografi Marina Vol 15, No 1 (2026): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v15i1.78458

Abstract

Global warming is driving an increase in the frequency and intensity of Marine Heatwaves (MHWs), which have a significant impact on coastal ecosystems. The detection of  MHWs in Indonesia's coastal regions remains understudied due to limited long term in-situ data, while satellite products often have a coarse resolution that cannot capture local coastal dynamics. This study addresses this gap by detecting MHWs on the north coast of Java. It evaluates the performance of the  Operational Sea Surface Temperature and Ice Analysis (OSTIA) product by comparing it against in-situ data from four Marine Automatic Weather Stations (Patimban, Karimunjawa, Rembang, and Paciran) from 2022–2024. To simulate an operational satellite based approach, MHWs were identified in the in-situ daily minimum temperature records using a climatology and 90th percentile threshold derived from the nearest satellite grid point. The statistical comparison reveals spatially variable differences in MHW frequency, duration, and total days between the two data sources. Event matching analysis indicates the best satellite performance at Paciran (Probability of Detection (POD)=0.74, False Alarm Ratio (FAR)=0.13), where most in-situ events were successfully captured. Conversely, the weakest performance was at Rembang (POD=0.43, FAR=0.59), where the satellite missed over half of the MHW days and exhibited a high false alarm rate. These findings demonstrate that significant MHWs occur in coastal regions, phenomena that may not be accurately captured by satellite data alone. 
Dinamika Stok Ikan Tongkol (Auxis rochei) di Laut Banda Friesland Tuapetel; Imanuel VT Soukotta; Junita Supusepa
Buletin Oseanografi Marina Vol 15, No 1 (2026): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v15i1.72048

Abstract

Ikan tongkol (Auxis rochei) merupakan komoditas perikanan bernilai ekonomi tinggi, namun peningkatan tekanan penangkapan berpotensi menurunkan keberlanjutan stok. Penelitian ini bertujuan mengkaji kondisi stok melalui analisis Catch per Unit Effort (CPUE), Maximum Sustainable Yield (MSY), Maximum Economic Yield (MEY), upaya penangkapan optimum (Eopt), serta kelayakan ekonomi dengan menggunakan Model Fox dan Schaefer. Data penelitian dikumpulkan selama tahun 2023 dari Dinas Kelautan dan Perikanan Provinsi Maluku dan Pelabuhan Perikanan Nusantara Ambon. Analisis dilakukan melalui perhitungan CPUE berdasarkan data hasil tangkapan dan penerapan regresi linier. Hasil penelitian menunjukkan adanya hubungan negatif yang kuat antara CPUE dan effort, dengan nilai koefisien determinasi berkisar antara 0,87–0,97. Estimasi MSY berdasarkan Model Fox dan Schaefer masing-masing mencapai 70.087 ton dan 158.027 ton dengan Eopt sebesar 13 dan 45 trip. Tingkat pemanfaatan stok saat ini masih berada pada kategori underfished, ditunjukkan oleh nilai jumlah tangkapan yang diperbolehkan (JTB) yang tinggi dibandingkan tangkapan aktual. Analisis MEY pada Model Fox menunjukkan efisiensi usaha tertinggi terjadi pada bulan Juni. Fluktuasi hasil tangkapan dipengaruhi oleh variasi musim dan dinamika oseanografi. Oleh karena itu, strategi pengelolaan perikanan tongkol di Laut Banda perlu difokuskan pada pengendalian upaya dan pengaturan musim penangkapan.    Skipjack tuna (Auxis rochei) is an economically valuable pelagic fishery resource, yet increasing fishing intensity may pressure long-term stock sustainability. This study aimed to evaluate skipjack tuna stock status through analyses of Catch per Unit Effort (CPUE), Maximum Sustainable Yield (MSY), Maximum Economic Yield (MEY), and optimal fishing effort (Eopt) using the Fox and Schaefer surplus production models. Data were collected throughout 2023 from the Maluku Provincial Marine and Fisheries Office and the Ambon Nusantara Fishing Port. Stock assessment was conducted by estimating CPUE from landing data and applying linear regression to examine relationships between fishing effort and stock indicators. The results showed a strong negative relationship between CPUE and fishing effort, with coefficients of determination ranging from 0.87 to 0.97. MSY estimates from the Fox and Schaefer models were 70,087 tons and 158,027 tons, corresponding to optimal fishing efforts of 13 and 45 trips. The current exploitation level was classified as underfished, as actual catches remained below the Total Allowable Catch. Therefore, management of skipjack tuna fisheries in the Banda Sea should emphasize fishing effort regulation and seasonal controls to support ecological sustainability and long-term economic benefits for fisheries.
Study of Chlorella vulgaris Density and Growth Rate at Different Effluent Concentrations Siti Siwi Wulandari; Tri Retnaningsih Soeprobowati; Kismartini Kismartini
Buletin Oseanografi Marina Vol 15, No 1 (2026): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v15i1.70775

Abstract

Household wastewater processing at the Communal Wastewater Treatment Plant (WWTP) operated by the Guyub Rukun Community in Tegalsari Hamlet, Salatiga City, Indonesia, is expected to reduce water pollution in the Cengek River. However, effluent testing revealed high concentrations of TP, COD, and BOD. This study aims to conduct laboratory-scale phycoremediation experiments using Chlorella vulgaris with media mixed using Communal WWTP effluent. Samples were taken from the outlet pipe to obtain household wastewater treatment effluent. Sampling was done using the grab sampling method at 2 PM during high sanitation activity. Based on laboratory tests, the highest Chlorella vulgaris density for 0% effluent concentration was 77.75 x 104 cells/mL (day 7), 66.13 x 104 cells/mL (day 6) in 20%, 126.13 x 104 cells/mL (day 7) in 40%, 69.38 x 104 cells/mL (day 6) in 60%, 188.88 x 104 cells/mL (day 6) in 80%, and 232 x 104 cells/mL (day 7) in 100%. The best growth rate at 0% effluent concentration was 3.87 cells/mL/day (day 6), 3.52 cells/mL/day (day 6) in 20%, 4.25 cells/mL/day (day 6) in 40%, 3.56 cells/mL/day (day 5) in 60%, 4.69 cells/mL/day (day 6) in 80%, and 4.99 cells/mL/day (day 7) in 100%. The results showed that Chlorella vulgaris's best density and growth rate was 100% effluent concentration. This indicates that the WWTP effluent's TP, TN, and Nitrate contents can be a good substitute for microalgae chemical fertilizers. This study also demonstrated that Chlorella vulgaris is in effective phycoremediation agent and can grow in high concentrations of WWTP effluent.

Page 41 of 41 | Total Record : 405

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