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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 374 Documents
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Analisa Mikroalga di Perairan Pelabuhan Provinsi Aceh untuk Deteksi Awal Adanya Invasif Spesies Syahrial, Syahrial; Hatta, Muhammad; Ruzanna, Arina; Jamil, Fajrul; Munira, Nanda; Laksono, Arief Budi; Al Azmy, Muhammad Ridho Al; Fauzi, Sabri; Sartika, Ayu; Handayani, Meutia; Nasution, Riski Dahrian
Buletin Oseanografi Marina Vol 13, No 2 (2024): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v13i2.60855

Abstract

Informasi ilmiah berkaitan dengan spesies invasif di Indonesia masih sangat minim terutama mengenai mikroalga. Kajian ini dilakukan pada bulan September – November 2023 di tiga pelabuhan Provinsi Aceh dengan tujuan untuk menganalisa faktor kualitas air, mengidentifikasi jenis mikroalga dan menduga ada tidaknya mikroalga invasif. Data mikroalga dikumpulkan dengan menyaring sampel air permukaan. Parameter suhu, pH, salinitas, kecepatan arus, kecerahan dan oksigen terlarut diukur secara in situ, sedangkan fosfat, nitrat dan ammonia diukur secara ex situ; serta karakteristik kualitas perairannya dianalisis dengan PCA. Sementara untuk menduga ada atau tidak adanya mikroalga invasif dilakukan dengan membandingkan hasil penelitian mikroalga para ahli lain di sekitar lokasi penelitian. Nilai fosfat, nitrat dan ammonia sudah melebihi baku mutu (1.07 ± 1.00 mg/L, 1.63 ± 0.95 mg/L, 0.47 ± 0.74 mg/L) yang mengindikasikan adanya peningkatan produksi mikroalga, kemudian komposisi mikroalganya ditemukan sebanyak 407 ind/ml, 21 spesies dan 5 kelas. Selanjutnya karakteristik kualitas perairannya menunjukkan adanya tiga pengelompokkan hasil dari analisis PCA dengan hasil identifikasi tidak menemukan spesies mikroalga invasif.  Scientific information relating to invasive species in Indonesia is still very minimal, especially regarding microalgae. This study was carried out in September – November 2023 at three ports in Aceh Province with the aim of analyzing water quality factors, identifying types of microalgae, and suspecting the presence or absence of invasive microalgae. Microalgae data was collected by filtering surface water samples. The parameters temperature, pH, salinity, current speed, transparency, and dissolved oxygen were measured in situ, while phosphate, nitrate, and ammonia were measured ex situ, and the water quality characteristics were analyzed using PCA. Meanwhile, to suspect the presence or absence of invasive microalgae, this is done by comparing the results of microalgae research from other experts around the research location. The values of phosphate, nitrate, and ammonia have exceeded the quality standards (1.07 ± 1.00 mg/L, 1.63 ± 0.95 mg/L, and 0.47 ± 0.74 mg/L), which indicates an increase in microalgae production. The microalgae composition was found to be 407 ind/ml, 21 species, and 5 classes. Furthermore, the water quality characteristics show that there are three groupings resulting from PCA analysis, with the identification results not finding invasive microalgae species.
Analisis Sebaran Suhu Permukaan Laut, Klorofil-a, dan Zona Potensial Penangkapan Ikan Cakalang di Perairan Jayapura Fofied, Fernanda Gitarini; Hartoko, Agus; Saputra, Suradi Wijaya
Buletin Oseanografi Marina Vol 13, No 3 (2024): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v13i3.63007

Abstract

Suhu permukaan laut dan klorofil-a merupakan parameter oseanografi yang penting untuk mengetahui keberadaan ikan cakalang dan mempermudah dalam menganalisis daerah penangkapan yang potensial. Penelitian ini menggunakan data suhu permukaan laut dan klorofil-a dari sensor Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua yang diunduh pada situs resmi National Aeronautics and Space Administration (NASA), kemudian diolah menggunakan perangkat lunak Sea WIFS Data Analysis System (SeaDAS).  Tujuan dilakukan penelitian ini adalah menganalisis sebaran Suhu permukaan laut (SPL) dan konsentrasi klorofil-a di Perairan Jayapura pada Musim Timur dan Musim Barat, serta memetakan zona potensial penangkapan ikan cakalang (Katsuwonus pelamis) di Perairan Jayapura berdasarkan sebaran spasio temporal musim Timur dan musim Barat. Data SPL dan klorofil satelit diolah dari 2018-2020. Metode penelitian yang digunakan pada penelitian ini mengacu pada penelitian yaitu metode deskriptif. Data koordinat tangkapan ikan cakalang dan data citra SPL dan klorofil-a diolah dengan metoda geo-statistik gridding. Selanjutnya data spasial tangkapan ikan di overlaykan pada data spasial SPL dan klorofil-a.  SPL di perairan Jayapura bervariasi antara 28‒35°C tahun 2018-2020 Musim Timur dan Musim Barat. Variasi konsentrasi klorofil-a secara temporal rata-rata berkisar antara 0,2-0,5 mg/m³ tahun 2018-2020 Musim Timur dan Musim Barat. Tangkapan ikan cakalang berkisar antara 60-1000 Kg.  Daerah penangkapan ikan yang potensial adalah daerah yang konsentrasi klorofil-a tinggi dengan kisaran pada Musim Timur antara 0,1-0,5 mg/m³ tahun berapa 2020 Musim Timur. Klorofil pada musim Barat 2020 berkisar antara 0,3‒0,5 mg/m³. Suhu optimum untuk penangkapan ikan pada Musim Timur 2020 berkisar antara 29°C-30°C , dan Musim Barat berkisar antara 28‒30 °C. Sea surface temperature and chlorophyll-a are important oceanographic parameters to determine the presence of skipjack tuna and analyze potential fishing zones. This research uses sea surface temperature and chlorophyll-a data from the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor downloaded from the National Aeronautics and Space Administration (NASA) official website and processed the data using the Sea WIFS Data Analysis System (SeaDAS) software.  The aim of this research is to analyze the distribution of sea surface temperature (SST) and chlorophyll-a concentrations in Jayapura waters during the East and West seasons, as well as to map the potential fishing zones for skipjack tuna (Katsuwonus pelamis) in Jayapura waters based on the temporal distribution of the East and West seasons. West. Satellite SST and chlorophyll data were processed from 2018-2020. The research method used in this research refers to research, namely the descriptive method. The coordinate data for skipjack tuna catches and SST and chlorophyll-a image data were processed using geo-statistical gridding methods. Next, the spatial data on fish catches is overlaid on the SST and chlorophyll-a spatial data.  SST in Jayapura waters varies between 28‒35°C in 2018-2020 East Season and West Season. The average temporal variation in chlorophyll-a concentration ranges between 0.2-0.5 mg/m³ in 2018-2020 East Season and West Season. Skipjack tuna catches range from 60-1000 kg.  Potential fishing areas are areas with high concentrations of chlorophyll-a with a range in the East Season between 0.1-0.5 mg/m³ what year is the 2020 East Season. Chlorophyll in the 2020 West season ranged from 0.3‒0.5 mg/m³. The optimum temperature for fishing in the 2020 East Season is between 29°C-30°C, and the West Season is between 28‒30°C.
Kandungan Mikroplastik pada Rajungan (Portunus pelagicus), Air Laut, dan Sedimen Di Perairan Desa Gugunung Wetan Kabupaten Rembang, Jawa Tengah Rohmaniyah, Lailatur; Widowati, Ita; Nuraini, Ria Azizah Tri
Buletin Oseanografi Marina Vol 13, No 1 (2024): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v13i1.46984

Abstract

Rembang merupakan salah satu wilayah yang memiliki daerah pantai, karena letaknya yang berada di Utara Pulau Jawa. Perairan laut Kabupaten Rembang merupakan salah satu penghasil perikanan yang besar di Indonesia, salah satu jenisnya yaitu rajungan (Portunus pelagicus). Rajungan sangat rentan terhadap kontaminasi mikroplastik dikarenakan hidup di daerah pasang surut (intertidal) atau didasar perairan yang langsung bersentuhan dengan substrat. Tujuan penelitian ini mengkaji dan menganalisis kandungan mikroplastik pada daging rajungan (Portunus pelagicus), air laut, dan sedimen di perairan laut Desa Gegunung Wetan, Kabupaten Rembang, Jawa Tengah. Sampel rajungan, air laut, dan sedimen kemudian dilakukan analisis kandungan mikroplastik menggunakan 2 metode, yaitu metode analisis fisikal yang di lakukan Laboratorium Tropical Marine Biotechnologi, Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro, Semarang dan metode analisis FTIR (Fourier Transform Infrared) yang dilakukan di Laboratorium Terpadu Universitas Gajah Mada, Yogyakarta. Hasil Penelitian menunjukkan ditemukan adanya partikel mikroplastik pada sampel rajungan adalah 68 partikel mikroplastik, dengan hasil FTIR menunjukan mikroplastik berjenis Polystyrene, Polycarbonate, Latex, Nitrile, dan Poly (Methyl Methacrylate) (PMMA atau Acrylic). Kemudian total kandungan mikroplastik pada sampel air laut adalah 28 partikel mikroplastik, dengan hasil FTIR menunjukan mikroplastik berjenis Polystyrene dan Polycarbonate. Selanjutnya total kandungan mikroplastik pada sampel sedimen adalah 33 partikel mikroplastik, dengan hasil FTIR menunjukan mikroplastik berjenis Polypropylene, Polycarbonate, Polystyrene, Polyethylene Terephthalate (PETE), dan Nitrile.  Rembang is one of the areas that has a coastal area, because it is located in the north of the island of Java. The marine waters of Rembang Regency are one of the largest fishery producers in Indonesia, one of which is the blue swimming crab (Portunus pelagicus). Crayfish are very susceptible to microplastic contamination because they live in intertidal areas or on the bottom of waters that are in direct contact with the substrate. The purpose of this study was to examine and analyze the content of microplastics in blue swimming crab meat (Portunus pelagicus), seawater, and sediments in the sea waters of Gegunung Wetan Village, Rembang Regency, Central Java. The blue swimming crab, seawater, and sediment samples were then analyzed for microplastic content using 2 methods, namely the physical analysis method carried out by the Tropical Marine Biotechnology Laboratory, Faculty of Fisheries and Marine Sciences, Diponegoro University, Semarang and the FTIR (Fourier Transform Infrared) analysis method carried out at the Integrated Laboratory of Gadjah Mada University, Yogyakarta. The results showed that microplastic particles were found in the swimming crab, seawater, and sediment samples. The total microplastic content in the swimming crab sample was 68 microplastic particles, with the FTIR results showing the microplastics of the types Polystyrene, Polycarbonate, Latex, Nitrile, and Poly (Methyl Methacrylate) (PMMA or Acrylic). Then, the total microplastic content in the seawater sample was 28 microplastic particles, with the FTIR results showing polystyrene and polycarbonate microplastics. Furthermore, the total microplastic content in the sediment sample was 33 microplastic particles, with FTIR results showing microplastics of the types Polypropylene, Polycarbonate, Polystyrene, Polyethylene Terephthalate (PETE), and Nitrile.
Chlorophyll Content of Chlorella vulgaris (Beijerinck, 1890) on Different Light Intensity Khairunnisa, Khairunnisa; Hartati, Retno; Widowati, Ita
Buletin Oseanografi Marina Vol 13, No 1 (2024): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v13i1.59218

Abstract

Chlorella vulgaris is a green microalga (Chlorophyta) known to produce chlorophyll pigment as its primary pigment. Chlorophyll is known for its health benefits because it helps heal wounds and prevent hemophilia and diabetes and asthma. Chlorophyll is one of the pigments targeted as a functional food source. One of the environmental parameters that can affect chlorophyll content is the presence of light. This study aims to determine the effect of differences in light intensity on the chlorophyll content of C. vulgaris. The method used in this research is experimental, conducted in the laboratory using a completely randomized design (RAL). ANOVA is the statistical analysis used to analyze the effect of light intensity on chlorophyll content in C. vulgaris. C. vulgaris was cultivated with three different light intensity treatments, namely 1500, 3000, and 4500 lux, with three repetitions each. The growth of C. vulgaris was observed for 8 x 24 hours and then harvested by centrifugation on the eighth day to obtain the wet biomass. Cultivation wet biomass was extracted using acetone PA solvent. The acetone extract of C. vulgaris was analyzed for its chlorophyll pigment content using a spectrophotometer at 645 and 663 nm absorbance. The highest content of chlorophyll-a, b, and chlorophyll produced at a light intensity of 1500 lux was 26.2, 48.5, and 74.7 µg/ml, respectively. According to the results of statistical analysis, it can be concluded that different light-intensity treatments did not show a significant effect (p>0.05) on the content of chlorophyll-a, b, and total chlorophyll in C. vulgaris.
Struktur Komunitas Dan Tutupan Terumbu Karang di Pulau Gili Labak dan Gili Genting, Sumenep, Indonesia Alamsyah, Febri; Nugraha, Wahyu Andy; Insafitri, Insafitri
Buletin Oseanografi Marina Vol 13, No 3 (2024): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v13i3.62113

Abstract

Pulau yang memiliki terumbu karang di kabupaten Sumenep adalah Pulau Gili Labak dan Pulau Gili Genting. Belum ada yang penelitian yang menganalisis struktur komunitas dan persentase tutupan terumbu karang dengan menggunakan metode UPT di Gili Labak dan Gili Genting. Penelitian ini dilaksanakan pada bulan Agustus 2023 menggunakan metode Underwater Photo Transect (UPT). Hasil penelitian menunjukkan Gili Labak mendapatkan persentase penutupan 73,25% dan Gili Genting 55,37% dikategorikan baik. Karang Acropora yang mendominasi di Gili Labak adalah jenis Acropora Digitate sebesar 23,87% dan non-Acropora yang mendominasi adalah Coral Foliose sebesar 6,8%. Karang Acropora yang mendominasi di Gili Genting adalah Acropora Branching sebesar 34,69% dan non-Acropora yang mendominasi adalah Coral Massive sebesar 7%. Gili Labak memiliki 10 genus yaitu Pavona sp., Pachyceris sp., Pacillopora sp., Acropora sp., Montipora sp., Porites sp., Stylophora sp., Favia sp., Oxypora sp. dan Fungia sp. Gili Genting memiliki 8 genus yaitu Seriatopora sp., Pacillopora sp., Acropora sp., Montipora sp., Porites sp., Stylophora sp., Pavia sp. dan Fungia sp. Indeks keanekaragaman di Gili Labak 1,51 dan Gili Genting 1,42 dikategorikan sedang. Indeks keseragaman di pulau Gili Labak 0,65 dan Gili Genting 0,68 dikategorikan tinggi. Indeks dominansi di Gili labak 0,34 dan Gili Genting 0,35 dikategorikan rendah.  The islands that have coral reefs in the Sumenep district are Gili Labak Island and Gili Genting Island. No research has yet analysed the community structure and percentage of coral reef cover using the UPT method in Gili Labak and Gili Genting. This research was conducted in August 2023 using the Underwater Photo Transect (UPT) method. The results showed that Gili Labak and Gili Genting have good condition of coral reef which high life coral coverage 73.25% 55.37% respectively. Acropora digitate are dominate coral life form in Gili Labak (23.87%) while foliose corals, non-acroporids, are abundant which has coverage 23.87%. The dominating Acropora coral in Gili Genting is Acropora Branching by 34.69% and the dominating non-Acropora is Coral Massive by 7%. Gili Labak has 10 genera namely Pavona sp., Pachyceris sp., Pacillopora sp., Acropora sp., Montipora sp., Porites sp., Stylophora sp., Favia sp., Oxypora sp. and Fungia sp. Gili Genting has 8 genera namely Seriatopora sp., Pacillopora sp., Acropora sp., Montipora sp., Porites sp., Stylophora sp., Pavia sp. and Fungia sp. The diversity index in Gili Labak 1.51 and Gili Genting 1.42 is categorised as medium. The uniformity index on the islands of Gili Labak 0.65 and Gili Genting 0.68 is categorised as high. The dominance index in Gili Labak 0.34 and Gili Genting 0.35 is categorised as low.
Karakteristik Dan Kesesuaian Lahan Tambak Udang Vaname (Litopenaeus vannamei) Di Kabupaten Kolaka Pariakan, Arman; Rahim, Rahim; Indrayani, Indrayani
Buletin Oseanografi Marina Vol 13, No 2 (2024): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v13i2.50925

Abstract

Udang vaname adalah spesies budidaya penting di Indonesia, terutama di Kabupaten Kolaka. Namun, hasil produksi dari kegiatan budidaya menurun setiap tahunnya. Ditemukan pertumbuhan udang tidak optimal dan munculnya penyakit hingga kegagalan panen yang pada akhirnya para pembudidaya merugi dan ditemukan telah banyak lahan budidaya yang terbengkalai. Hal ini diakibatkan karena tidak adanya evaluasi kesesuaian lahan sejak awal. Tujuan penelitian ini adalah mengevaluasi kesesuaian lahan pada tambak udang vaname di pesisir Kabupaten Kolaka khususnya pada Kecamatan Wundulako dan Pomalaa berdasarkan karakteristik air dan tanah.  Pengukuran parameter air dan tanah, seperti amonia, nitrit, salinitas, suhu, oksigen terlarut, pH air, pH tanah, dan potensial redoks tanah, dikumpulkan dari 50 lokasi tambak udang. Pengujian dilakukan baik di laboratorium maupun di lapangan (in situ). Data yang terkumpul dianalisis menggunakan metode analisis spasial Inverse Distance Weighted (IDW) dengan software ArcGIS 10.2., kemudian dipertajam dengan teknik tumpang susun yang digabungkan dengan kriteria kesesuaian lahan budidaya tambak udang vaname, yakni sangat sesuai, cukup sesuai, sesuai marjinal. kriteria kesesuaian ini telah diberi bobot nilai kepentingan berdasarkan pertimbangan studi kepustakaan dan pembenaran ahli.. Hasil analisis pada lokasi budidaya tambak udang di Kolaka ditemukan hanya dua kategori kesesuaian yaitu cukup sesuai dan sesuai marjinal dengan luas 1,208 Ha dan 13,7 Ha. Hasil dari penelitian ini memberikan panduan bagi pembudidaya dalam  memilih lokasi dan merencanakan tindakan dalam kegiatan budidaya udang vaname yang sesuai, sehingga diharapkan dapat meningkatkan produktivitas dan keberlanjutan usaha budidaya udang di masa depan.  Vaname shrimp is one of the shrimp species cultivated in Indonesia, especially in Kolaka Regency. However, production from aquaculture activities has decreased every year. It was found that shrimp growth was not optimal and the emergence of disease and crop failure resulted in farmers losing money and many cultivation areas were found abandoned. This is due to the absence of land suitability evaluation from the beginning. This study aims to evaluate the suitability of vaname shrimp ponds on the coast of Kolaka Regency, especially in Wundulako and Pomalaa sub-districts based on water and soil characteristics. Measurements of water and soil parameters, such as ammonia, nitrite, salinity, temperature, dissolved oxygen, water pH, soil pH, and soil redox potential, were collected from 50 shrimp pond sites. Tests were conducted both in the laboratory and in the field (in situ). The collected data were analyzed using the Inverse Distance Weighted (IDW) spatial analysis method with ArcGIS 10.2 software, then refined with overlapping techniques combined with land suitability criteria for white shrimp pond culture, namely highly suitable, moderately suitable, and marginally suitable. The suitability criteria have been given a weighted importance value based on the consideration of literature studies and expert justification. The results of the analysis on the location of shrimp aquaculture ponds in Kolaka found only two categories of suitability, namely moderately suitable and marginally suitable with an area of 1,208 Ha and 13.7 Ha. The results of this study guide farmers in selecting locations and planning actions in suitable vaname shrimp farming activities, so it is expected to increase the productivity and sustainability of shrimp farming in the future
Total Suspended Solid Concentration Dynamics and Distribution Based on Geospatial Models in Mojo River Estuary, Pemalang Aini, Firly Nur; Indarjo, Agus; Zainuri, Muhammad; Endrawati, Hadi; Redjeki, Sri; Pribadi, Rudhi; Setiyono, Heryoso; Suryoputro, Agus Anugroho Dwi
Buletin Oseanografi Marina Vol 13, No 2 (2024): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v13i2.64406

Abstract

Total suspended solids (TSS) concentrations and distribution provide information to determine the quality of the carrying capacity of waters as marine resources. The purpose of the research is to analyze the concentration and distribution of TSS in marine waters due to anthropogenic impacts on land. The concentration and distribution changes of TSS were analyzed using a geospatial model approach. The in-situ data were collected in September 2023 at 14 stations in the east monsoon and analyzed in the laboratory using the gravimetric method. The results show that TSS concentration range from 29.2–52.6 mg/L. The distribution of MPT content in the Mojo River Estuary, Pemalang has several groups of stations with convergent forms, where the high source of MPT comes from around the lagoon, namely the aquaculture and mangrove areas, then in general it is also affected by waste from anthropogenic activities of the, surrounding industries seasonal currents, which are related to wind and seasons, as well as currents due to waters from tides.
Leaf Damage in Segara Anakan Mangrove Forest, Cilacap Kresnasari, Dewi; Zainuri, Muhammad; Muskananfola, Max Rudolf; Pribadi, Rudhi
Buletin Oseanografi Marina Vol 13, No 3 (2024): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v13i3.63137

Abstract

Segara Anakan Mangrove Forest in Cilacap is one of the most extensive mangrove forests on the southern coast of Java Island. This study aims to determine the level of herbivory and environmental conditions. The sampling technique used was purposive random sampling, which considered the different characteristics of the vegetation. Sonneratia caseolaris dominated Station 1, while Station 2 was more diverse, including Avicennia marina, Avicennia alba, Rhizophora mucronata, Sonneratia caseolaris, and Aegiceras corniculatum. Each station is spread over three points, each with five sampling plots, representing the distribution and zonal homogeneity of carrying capacity. The research was conducted in May, August, and November 2023, based on the different temporal seasons in Indonesia. The results showed biotic factors from herbivory activity and abiotic factors such as the hydrological cycle caused mangrove leaf damage. The class of leaf damage caused by herbivory at all observation stations was mainly in class I (<2.5%). The most leaf damage was found in old leaves, which is related to the optimal photosynthesis process producing carbohydrates as a food source for herbivores. Additionally, tannin content in the leaves plays a role in protection from excessive UV radiation during the dry season. This condition indicates that Segara Anakan mangrove forest is still in good condition. PCA analysis results show that mangrove leaf damage is closely related to the age of the leaves.
Analisis Variabilitas Klorofil-a dan Suhu Permukaan Laut pada saat Kejadian Siklon Tropis Lili di Laut Timor dan sekitarnya Sinaga, Boby Christian; Wirasatriya, Anindya; Helmi, Muhammad
Buletin Oseanografi Marina Vol 13, No 3 (2024): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v13i3.65797

Abstract

 Siklon Tropis Lili terjadi mulai tanggal 27 April hingga 30 April 2017, merupakan siklon yang melintasi Laut Timor. Analisis siklon tropis Lili terhadap parameter klorofil-a dan suhu permukaan laut dilakukan dengan data penginderaan jauh dan reanalisis selama empat belas tahun digunakan untuk menganalisis variabilitas konsentrasi klorofil-a dan suhu permukaan laut (SST). Dataset yang digunakan termasuk Copernicus Glob-Colour untuk klorofil-a dan Optimally Interpolated Sea Surface Temperature (OISST) untuk SST. Data angin dari Cross-Calibrated Multi-Platform (CCMP) juga digunakan untuk menilai angin dan kecepatan pemompaan Ekman (EPV) sebagai parameter siklon tropis. Data dianalisis secara spasial dan temporal serta anomali dihitung untuk setiap parameter. Analisis korelasi dilakukan selama fase pembentukan, puncak, dan peluruhan Siklon Tropis Lili, dengan fokus pada Laut Timor dan wilayah dengan kecepatan angin maksimum. Hasil menunjukkan bahwa Siklon Tropis Lili mengurangi SST dan meningkatkan klorofil-a di Laut Timor. EPV negatif menyebabkan upwelling, mengurangi SST dan meningkatkan klorofil-a. Selain itu, angin kencang meningkatkan pelepasan panas laten dan penguapan, yang memengaruhi penurunan SST.   Tropical Cyclone Lili occurred from April 27 to April 30 2017, passing through the Timor Sea. Remote sensing and reanalysis data spanning fourteen years were used to analyze the variability of chlorophyll-a concentration and sea surface temperature (SST). The datasets included Copernicus Glob-Colour for chlorophyll-a and Optimally Interpolated Sea Surface Temperature (OISST) for SST. Wind data from the Cross-Calibrated Multi-Platform (CCMP) were also used to assess wind and Ekman pumping velocity (EPV) as parameters of tropical cyclones. The data were analyzed spatially and temporally, with anomalies calculated for each parameter. Correlation analysis was performed during the formation, peak, and decay phases of Tropical Cyclone Lili, focusing on the Timor Sea and the region with maximum wind speed. Results showed that Tropical Cyclone Lili reduced SST and increased chlorophyll-a in the Timor Sea. The negative EPV induced upwelling, reducing SST and increasing chlorophyll-a. Additionally, strong winds enhanced latent heat release and evaporation, further reducing SST.
Kajian Karakteristik dan Run-Up Gelombang Tsunami Berdasarkan Pemodelan Hidrodinamika 2D di Perairan Selatan Bali Tagore, Rafa Fahrezi; Helmi, Muhammad; Satriadi, Alfi; Khoirunnisa, Hanah; Ismanto, Aris
Buletin Oseanografi Marina Vol 14, No 1 (2025): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v14i1.62777

Abstract

Pulau Bali merupakan wilayah yang memiliki potensi bencana alam seperti gempa bumi dan tsunami karena terletak di zona subduksi pertemuan lempeng Indo-Australia dengan lempeng Eurasia dan zona sesar belakang Flores. Kejadian tsunami telah terjadi di wilayah selatan Bali akibat dari bencana gempa Sumbawa (1977) dan gempa Banyuwangi (1994). Kajian terkait karakteristik dan run-up gelombang tsunami masih jarang dilakukan. Penelitian ini dilakukan dengan tujuan untuk mengetahui karakteristik dan run-up gelombang tsunami menggunakan pemodelan hidrodinamika 2D. Simulasi dilakukan menggunakan skenario gempa terburuk dengan kekuatan magnitudo 9,0 melalui model TUNAMI F1 dan TUNAMI N3. Hasil dari penelitian ini menunjukkan bahwa gelombang tsunami yang menjalar dari episenter menuju pesisir selatan Bali memiliki karakteristik waktu tempuh berkisar antara 16 menit 5 detik hingga 30 menit 35 detik dengan tinggi gelombang maksimum berkisar antara 11,113 – 34,446 m. Waktu tempuh penjalaran tercepat dengan tinggi gelombang tertinggi terdapat pada titik observasi Uluwatu dan Pandawa karena jarak yang dekat dengan episenter. Limpasan gelombang yang masuk ke daratan pesisir selatan Pulau Bali mampu menjangkau daratan hingga kisaran 257 – 3140 m dengan limpasan terjauh pada titik observasi Kuta karena morfologi pantai berpasir yang landai, sedangkan Uluwatu dan Pandawa menerima limpasan yang paling sedikit karena morfologi pantai yang berbatu dan tebing curam.

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