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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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Pengelolaan Ekosistem Lamun dengan Pendekatan Sistem Ekologi di Kawasan Konservasi Perairan Daerah (KKPD) Biluhu Timur Umar, Olpin; Hamzah, Sri Nuryatin; Hasim, Hasim
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.v14i2.66602

Abstract

Lamun merupakan salah satu ekosistem penting, karena menyediakan berbagai layanan ekosistem yang mendukung kehidupan di pesisir dan laut. Penelitian ini bertujuan untuk mengetahui pengelolaan ekosistem lamun dengan pendekatan sistem ekologi di perairan Biluhu Timur yang telah ditetapkan sebagai Kawasan Konservasi Perairan Daerah (KKPD) sejak tahun 2023. Penelitian dilaksanakan pada bulan Agustus-September tahun 2024. Sebanyak empat stasiun penelitian ditetapkan berdasarkan metode purposive sampling. Pengambilan sampel lamun menggunakan metode Seagrass Net dengan kuadran ukuran 50 x 50 cm. Analisis data pada penelitian ini meliputi analisis frekuensi kehadiran, kerapatan jenis dan persen tutupan. Hasil penelitian menunjukkan  bahwa jenis lamun yang ditemukan di KKPD Biluhu Timur sebanyak 10 jenis yaitu Enhalus acoroides, Cymodocea serrulata, Cymodocea rotundata, Halophila decipiens, Halophila ovalis, Halodule pinifolia, Halodule uninervis, Syringodium isoetifolium, Thalassodendron ciliatum, dan Thalassia hemprichii. Hasil analisis kerapatan lamun tertinggi di KKPD Biluhu Timur yakni jenis lamun Cymodocea rotundata dengan nilai 677,53 ind/m2 dan kerapatan terendah pada jenis Halophila decipiens dengan nilai 15.00 ind/m2. Frekunesi kehadiran tertinggi yakni pada jenis Cymodocea rotundata dan frekuensi kehadiran terendah pada jenis Halophila decipiens . Hasil analisis persen tutupan sebesar 54,64% menunjukkan bahwa kondisi lamun di KKPD Biluhu termasuk dalam kategori /kurang sehat.    Seagrass is one of the essential ecosystems, as it provides various ecosystem services that support coastal and marine life. This study aims to determine the management of seagrass ecosystems with an ecological systems approach in the waters of Biluhu Timur, which has been designated as a regional marine protected area (MPA) since 2023. The study was conducted in August-September 2024. Four research stations were identified based on the purposive sampling method. Seagrass sampling was performed using the seagrass net method with a 50 x 50 cm quadrant size. Data analysis in this study includes the frequency of presence, species density and percent cover. The results of the study showed that there were ten species of seagrass found in Biluhu Timur MPA, namely Enhalus acoroides, Cymodocea serrulata, Cymodocea rotundata, Halophila decipiens, Halophila ovalis, Halodule pinifolia, Halodule uninervis, Syringodium isoetifolium, Thalassodendron ciliatum, and Thalassia hemprichii. The results of the analysis of the highest seagrass density in the Biluhu Timur MPA were the Cymodocea rotundata seagrass with a value of 677.53 ind/m2, and the lowest density was the Halophila decipiens type with a value of 15.00 ind/m2. The highest frequency of presence was the Cymodocea rotundata species, and the lowest was the Halophila decipiens species. The results of the analysis of the percentage of cover of 54.64% indicate that the condition of the seagrass in the  Biluhu Timur Marine Protected Area is in the less healthy category.
Analisis Bahan Organik dan Keterkaitannya terhadap Parameter Lingkungan Di Muara Sungai Banger, Pekalongan Arrahmah, Syifa; Masluka, Lilik; Nugroho, Denny
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.v14i2.54195

Abstract

Perairan Sungai Banger memiliki beragam kegiatan antropogenik seperti industri batik, perikanan, dan pertanian. Hal ini dapat memberikan kontribusi terhadap masuknya bahan organik. Bahan organik yang terdapat dalam perairan dapat memberikan gambaran tingkat pencemaran. Bahan organik di perairan dapat diprediksi melalui pengukuran parameter seperti BOD5 (Biological Oxygen Demand), COD (Chemical Oxygen Demand) dan kandungan karbon organik total (KOT). Penelitian ini bertujuan untuk mengetahui perbedaan nilai bahan organik di perairan melalui pengukuran parameter karbon organik total (KOT), parameter BOD5 dan COD. Data parameter kualitas air sebagai data pendukung yang diukur secara in situ meliputi salinitas, suhu, pH, kecerahan dan oksigen terlarut (DO). Hasil pengamatan menunjukkan nilai KOT terukur berkisar 5,40 – 9, 60 mg/l, nilai BOD5 terukur berkisar2,82 – 5,076 mg/l dan nilai COD terukur berkisar 28,85 – 41,87 mg/l. Analisis komponen utama memperlihatkan bahwa keberadaan BOD dan COD dipengaruhi oleh suhu, sementara KOT lebih banyak oleh pH. Selain itu KOT memiliki hubungan negatif kuat terhadap salinitas, kecerahan dan oksigen terlarut (DO).  The waters of the Banger River have a variety of anthropogenic activities such as the batik industry, fisheries, and agriculture. This can contribute to the influx of organic matter. Organic matter contained in waters can give an idea of the level of pollution. Organic matter in waters can be predicted through the measurement of parameters such as BOD5 (Biological Oxygen Demand), COD (Chemical Oxygen Demand) and total organic carbon content (KOT). This study aims to determine the difference in the value of organic matter in waters through the measurement of total organic carbon parameters, BOD5 and COD parameters. Water quality parameter data as supporting data measured in situ include salinity, temperature, pH, brightness and dissolved oxygen (DO). The results showed that the measured TOC values ranged from 5.40 - 9, 60 mg/l, measured BOD5 values ranged from 2.82 - 5.076 mg/l and measured COD values ranged from 28.85 - 41.87 mg/l. Principal component analysis showed that the presence of BOD and COD was influenced by temperature, while KOT was more by pH. In addition, KOT had a strong negative relationship with salinity, brightness and dissolved oxygen (DO).
Blue Carbon Degradation on Coral Reefs as Impact of Climate Change: Case Study at Samalona Island, Makassar City, South Sulawesi Al Faidi, Andi Siti Nur Azizah; Resky, Dwisha Aprilia; Alivaiz, A. Firdhlan; Nadjib, Almira Izzah Fawziyah; Devara, Zein Abiya; Rimantho, Dedi
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.v14i2.70792

Abstract

Climate change is one of the global environmental hazards that can threaten humans and nature. Climate change can affect changes in temperature and rainfall. This research aims to estimate how much blue carbon potential can be absorbed by coral reefs on Samalona Island, and the effect on climate change. The collection of climate data for the last five years and Live Coral data for the last four years sourced from previous studies, added with field observations to obtain Live Coral data using the quadrat transect method. The identification results showed that there were 33,22% Live Coral, 50,56% Dead Coral, 7,44% Others, 8,78% Algae. To determine the blue carbon value, by multiplying the Live Coral data by the area of Samalona Island. The results are converted into square meters and multiplied by 7,72 x 10^-5 kg/m², this is the blue carbon value of Acropora Aspera. To determine the effect, simple regression was used with SPSS software. The results found that the interpretation value of blue carbon on temperature is 0,666 and on rainfall is 0,264, which shows that the relationship between blue carbon and temperature is strong and weak on rainfall.
Kandungan Logam Berat Besi (Fe) pada Sedimen Ekosistem Terumbu Karang di Perairan Pulau Kalih Selatan Banten Nurjanah, Siti; Nazwasyawinka, Keyla; Abrar, Camelia Batun; Nasution, Isra Amalia; Dida, Eki Naidania; Sasongko, Agung Setyo; Widiyanto, Kukuh; Cahyarini, Sri Yudawati
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.v14i2.69313

Abstract

Pulau Kalih Selatan terletak di sebelah barat laut Teluk Banten yang berdekatan dengan kawasan industri dan daerah penangkapan ikan menggunakan Keramba Jaring Apung (KJA). Pulau ini memiliki keanekaragaman hayati seperti ekosistem mangrove, terumbu karang, dan lamun. Kawasan Industri di sekitar pulau dapat berdampak pada ekosistem perairan salah satunya pencemaran logam berat besi. Penelitian ini bertujuan untuk mengidentifikasi kandungan logam berat besi (Fe) yang terakumulasi pada sedimen di Pulau Kalih Selatan. Sampel sedimen dikumpulkan dari lima stasiun menggunakan metode purposive random sampling. Logam Berat Fe dianalisis di Laboratorium Kimia BRIN KST Samaun Samadikun menggunakan metode Flame Atomic Absorption Spectrophotometer (FAAS). Hasil yang diperoleh dari analisis logam berat Fe menunjukan sedimen di Pulau Kalih Banten memiliki konsentrasi logam berat Fe antara 1.771 mg/kg hingga 41.455 mg/kg, dengan nilai rata-rata 11.144 mg/kg. Kandungan Fe dalam sedimen di hampir seluruh titik lokasi pengambilan sampel berada di bawah baku mutu dari Guidelines for the Protection and Management of Aquatic Sediment Quality in Ontario, hal ini diduga logam berat Fe yang terdapat pada perairan mengalami pengenceran dan sebagian terbawa menuju ke laut lepas yang dipengaruhi gelombang dan arus yang dapat menyebarkan kandungan Fe di semua stasiun nilainya lebih kecil dari baku mutu.   South Kalih Island is located in the northwestern part of Banten Bay, adjacent to an industrial area and a fishing area using floating net cages (KJA). The island has biodiversity such as mangroves, coral reefs, and seagrasses. Industrial areas around the island can have an impact on aquatic ecosystems, one of which is heavy metal iron pollution. This study aims to identify the content of heavy metal iron (Fe) accumulated in sediments on South Kalih Island. Sediment samples were collected from five stations using purposive random sampling method. Fe heavy metals were analyzed at the BRIN KST Samaun Samadikun Chemistry Laboratory using the Flame Atomic Absorption Spectrophotometer (FAAS) method. The results obtained from the Fe heavy metal analysis showed that sediments in Kalih Island Banten had Fe heavy metal concentrations between 1,771 mg/kg to 41,455 mg/kg, with an average value of 11,144 mg/kg. The Fe content in sediments at almost all points of the sampling location is below the quality standards of the Guidelines for the Protection and Management of Aquatic Sediment Quality in Ontario, this is thought to be heavy metal Fe contained in the waters undergoes dilution and partially carried to the open sea which is influenced by waves and currents that can spread the Fe content at all stations the value is smaller than the quality standards. 
Identifikasi dan Analisis Filogenetik Gastropoda pada Ekosistem Mangrove Tapak Kota Semarang dengan Pendekatan DNA Barcoding Friliana Rindyaneputri, Adella; Ayuningrum, Diah; Febrianto, Sigit; Rudolf Muskananfola, Max
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.v14i2.63541

Abstract

Ekosistem mangrove memiliki berbagai peranan ekologis, salah satunya adalah sebagai habitat organisme gastropoda. Gastropoda ekosistem mangrove berperan sebagai bioindikator dan dekomposer. Identifikasi spesies gastropoda secara molekuler di kawasan mangrove penting dilakukan untuk mengetahui spesies-spesies gastropoda yang ditemukan secara akurat. Penelitian ini bertujuan untuk mengidentifikasi spesies gastropoda dan tingkat kekerabatannya di Kawasan Mangrove Desa Tapak Kecamatan Tugu Kota Semarang yang dilaksanakan pada bulan September - November 2023. Metode yang digunakan dalam penelitian ini yaitu deskriptif-kuantitatif. Pengambilan sampel penelitian dilakukan dengan metode purposive sampling. Penanda genetik yang digunakan dalam penelitian ini adalah gen Cytochrome Oxydase I (COI) dengan penyejajaran sekuens DNA menggunakan metode MUSCLE. Analisis filogenetik berbasis algoritma neighbor joining (NJ) 1000 bootstrap pada software MEGA X. Hasil identifikasi molekuler diperoleh bahwa sampel GT1 memiliki kemiripan sebesar 96,12% (Percent Identity) dengan Pirenella alata dan sampel GT2 sebesar 99,69% (Percent Identity) dengan Telescopium telescopium. Hasil analisis filogenetik menunjukkan kladogram kedua spesies ini terdapat pada klade yang berbeda. Klade I terdiri dari sampel GT1 beserta 4 spesies pembanding lainnya dalam 1 genus, yaitu Pirenella alata, Cerithidea microptera, Pirenella nanhaiensis, dan Pirenella incisa. Klade II terdiri dari sampel GT2 beserta 4 spesies pembanding lainnya yaitu Telescopium telescopium, Varicinassa variciferus, Laevilitorina caliginosa, dan Monoplex krebsii.  Mangrove ecosystem has many ecological roles, one is as gastropods habitat. Mangrove ecosystems gastropods act as bioindicators and decomposers. Gastropods mangroves areas molecular identification is important to accurately the types of gastropod species. This research aims to identify gastropods species and the relationship levels in the Mangrove Area of Tapak Village, Tugu District, Semarang conducted from September − November 2023. This research using descriptive-quantitative method. Research sampling using purposive sampling method. The genetic marker used in this research is the Cytochrome Oxydase I (COI) gene with DNA sequence alignment MUSCLE method. Phylogenetic analysis based on the neighbor joining (NJ) 1000 bootstrap algorithm in MEGA X. The results of molecular identification showed that GT1 sample had a similarity of 96.12% (Percent Identity) to Pirenella alata and GT2 sample was 99.69% (Percent Identity) similar to Telescopium telescopium. The results of the phylogenetic of two species analysis show that the cladograms are in different clades. Clade I consist of sample GT1 along with 4 other comparison species in 1 genus, namely Pirenella alata, Cerithidea microptera, Pirenella nanhaiensis, and Pirenella incisa. Clade II consists of sample GT2 along with 4 other comparison species, namely Telescopium telescopium, Varicinassa variciferus, Laevilitorina caliginosa, and Monoplex krebsii.
Spatio-Temporal Characteristic Analysis of Marine Heatwaves in the Savu Sea (1982-2021) Attaqwa, Rizal; Respati, Deodato Naresvara Rayi; Juviani, Dian; Susilodewi, Sinta Dwis; Saragih, Laurentia Alexandra; Mustaqim, Ikhsan; Wirasatriya, Anindya; Ismunarti, Dwi Haryo
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.v14i2.70846

Abstract

Atmospheric interactions have led to a consistent rise in ocean temperatures in the Indonesian seas, exacerbated by the emergence of marine heatwaves (MHWs) that extend over thousands of kilometers. MHWs are defined as temperature anomalies above the 90th percentile of the sea surface temperature (SST) baseline for at least five consecutive days. The Savu Sea, influenced by the Indonesian throughflow that transports warm water from the Pacific to the Indian Ocean, experiences significant temperature anomalies. This study employs OSTIA L4 Marine Copernicus Global Ocean Physics Reanalysis SST data from 1982 to 2021 to analyze the frequency, duration, and intensity of MHW events in this region. Using Hobday's hierarchical approach, the study finds that MHWs in the Savu Sea lasted up to 1,170 days over 40 years, with 117 recorded events. The worst MHW event occurred in 2016, lasting 194 days with a maximum cumulative intensity of 2.0°C/year, particularly affecting the northern Savu Sea. These heatwaves significantly impact marine ecosystems, leading to coral bleaching that affects about 50% of coral colonies and threatens marine biodiversity and fisheries recovery.
Penilaian Analisis Cluster dan Non-Metric Multidimensional Scalling terhadap Struktur Komunitas Mangrove di Desa Bagan Serdang, Sumatera Utara Surbakti, Livia Chasinta; Erlangga, Erlangga; Syahrial, Syahrial; Hadinata, Fitra Wira; Nufus, Hayatun; Anggraini, Rika; Agustini, Nella Tri; Leni, Yusyam; Rolin, Febrina; Utami, Risnita Tri
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.v14i2.69484

Abstract

Analisis multivariat seperti cluster dan nMDS sering digunakan untuk membantu interpretasi data lingkungan, sedangkan struktur komunitas vegetasi tumbuhan sangat berguna dalam mendeskripsikan ekologi suatu ekosistem, sehingga kajian penilaian analisis cluster dan nMDS terhadap struktur komunitas mangrove Desa Bagan Serdang dilakukan pada bulan September 2021. Hal ini bertujuan untuk mengetahui struktur komunitas mangrovenya berdasarkan analisis cluster dan nMDS. Vegetasi mangrove dikumpulkan dengan menarik transek kuadran yang tegak lurus garis pantai, kemudian data vegetasi mangrove dievaluasi menggunakan cluster dan nMDS. Keanekaragaman mangrove Desa Bagan Serdang teridentifikasi sebanyak 5 spesies dengan 4 famili, dimana penyebaran mangrovnya tergolong sesekali ditemukan (rata-rata frekuensi relatifnya 20,00%). Zona paling depan didominasi oleh Avicennia lanata, zona tengah didominasi oleh Rhizophora apiculata dan zona belakang didominansi oleh Rhizophora mucronata. Kerapatan mangrovenya berkisar antara 22,22 – 1222,22 ind/ha dan INP berkisar antara 9,64 – 231,78% dengan kerapatan vegetasi zona depan maupun tengah membentuk satu kelompok yang mengindikasikan kondisi kerapatannya hampir sama. Selanjutnya untuk INP, vegetasi zona depan dan tengah membentuk satu kelompok dengan spesies yang berperan penting adalah A. lanata serta R. apiculata, sedangkan di zona belakang, spesies yang berperan pentingnya adalah R. mucronata, E. agallocha dan X. granatum. Selain itu, basal area vegetasi mangrove Desa Bagan Serdang berkisar antara 278,22 – 654,35 m2/ha dengan basal area vegetasi zona depan maupun belakang memiliki tingkat kedewasaan yang hampir sama, sehingga membentuk satu kelompok. Kajian ini mengungkapkan adanya komposisi spesies mangrove campuran dengan perkembangan kedewasaan mangrovenya berbeda-beda. Data yang diinfokan dalam kajian ini akan menjadi baseline pengelolaan mangrove di Desa Bagan Serdang dan upaya konservasi di Provinsi Sumatera Utara maupun Indonesia.  Multivariate analyses such as clusters and nMDS are frequently used to facilitate in the interpretation of environmental data. In contrast, the community structure of plant vegetation is immensely useful in describing the ecology of an ecosystem. In September 2021, studies on the mangrove community structure of Bagan Serdang Village were conducted using cluster analysis and nMDS. It proposes to use cluster analysis and nMDS to determine the structure of the mangrove community. Mangrove vegetation was collected by pulling quadrant transects perpendicular to the shoreline, and the data was analyzed using clusters and nMDS. The diversity of mangroves in Bagan Serdang Village was identified as 5 species with 4 families, with mangrove distribution classified as occasional (average relative frequency of 20,00%). Avicennia lanata dominates the front zone, Rhizophora apiculata dominates the middle zone, and R. mucronata dominates the back zone. The mangrove density ranges from 22,22 to 1222,22 ind/ha, and the INP ranges from 9,64 to 231,78%, with the vegetation density in the front and middle zones forming one group that shows nearly the same density conditions. Furthermore, for the INP, the front and middle zone vegetation formed a group with species that played an important role which were A. lanata and R. apiculata, while species that played an important role in the rear zone were R. mucronata, E. agallocha, and X. granatum. Furthermore, the basal area of the mangrove vegetation in Bagan Serdang Village ranges from 278,22 to 654,35 m2/ha, with the basal area of the vegetation zones front and back having nearly the same maturity level, forming a single group. This study reveals the presence of a mixed mangrove species composition with different mangrove maturity developments. The data presented in this study will be the baseline for mangrove management in Bagan Serdang Village and conservation efforts in North Sumatra Province and Indonesia. 
Abundance and Composition of Targeted Reef Fish in an Unprotected Coral Reef Ecosystem: A Case Study of Oransbari Bay Kolibongso, Duaitd; Sitinjak, Toni; Bawole, Roni
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.v14i2.63931

Abstract

Reef fisheries particularly those targeting specific fish species are integral to the coral reef ecosystem. Unprotected sites typically exhibit substantial declines in fish densities due to fishing pressure. We conducted an analysis to determine whether the abundance of target fish species correlates with benthic community structure and changes in composition resulting from fishing activities. The point intercept transect (PIT) method was employed to evaluate coral reef condition, while underwater visual census (UVC) was utilized to assess target fish species at three sites in Oransbari Bay. The mean live coral cover in Oransbari Bay was measured at 20.2% ± 2.37 (mean ± standard error). Benthic cover exhibited variation, with rubble comprising 27.6% ± 3.73%, sand 29.3% ± 2.58%, dead coral 9.44% ± 2.91%, and turf algae 4.33% ± 3.47%. The target species group displayed diversity, with 13 species identified across six families: Acanthuridae, Lutjanidae, Serranidae, Caesionidae, Balistidae, and Mullidae. Reef fish abundance ranged from 3,146.7 to 9,986.7 individuals per hectare, with the Acanthuridae family demonstrating the highest abundance and diversity, as it was present at all locations. This study elucidates that the abundance and diversity of target reef fish species in unprotected areas are significantly influenced by coral cover and fishing activities. These findings provide crucial insights into the status of fish resources beyond protected areas in the Bird’s Head Peninsula, contributing valuable information for future management of coral reef ecosystems.
Hydro-Morphological Conditions of the Coastline Post-Construction of Sea Dikes in Pekalongan, Central Java Safikri, Ilham; Zainuri, Muhammad; Ismanto, Aris
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.v14i2.72357

Abstract

Pekalongan is one of the cities in Central Java affected by tidal flooding. Tidal floods occur due to sea level rise and land subsidence in Pekalongan, so far the tidal floods have had an impact on the community. Infrastructure damage and disruption of community activities are examples of the impact of tidal floods in Pekalongan. One of the government policies in overcoming tidal floods is to build sea walls along the coast of     Pekalongan. This policy will certainly have an impact on the morphological pattern of the coastal area. This study was conducted to determine the pattern of currents, waves, and sediment characteristics on the coast of Pekalongan after the sea wall. The analysis was conducted using current and wave modeling of delft-3d application. Sediment analysis was conducted by analyzing sediment grain size (Granulometry). The results show that currents and waves are influenced by seasonal winds that occur in Pekalongan. The dominant season in coastal Pekalongan occurs between December - January (West Season). Current conditions in the west season move with a speed of 0.2 -0.3 m/set moving eastward. West season wave conditions move with a height of 7.2 meters with a peak period of 7.2 seconds. While the sediment characteristics in Pekalongan are dominated by mud - sandy. From these sediment characteristics, it can be concluded that the influence of currents and waves of the west season can cause the distribution of sediments towards the east.
Distribusi Spasial dan Komposisi Sampah Laut pada Ekosistem Mangrove Kepulauan Karimunjawa Assidqy, Muammar Ridho; Febrianto, Sigit; Ain, Churun
Buletin Oseanografi Marina Vol 14, No 3 (2025): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v14i3.72787

Abstract

Ekosistem mangrove memiliki peran strategis dalam menjaga stabilitas wilayah pesisir, baik dari aspek ekologis, ekonomis, maupun sosial. Meningkatnya aktivitas antropogenik seperti permukiman, pariwisata, dan perikanan menyebabkan akumulasi sampah laut yang mengancam keberlanjutan ekosistem mangrove. Kepulauan Karimunjawa sebagai kawasan konservasi mengalami tekanan akibat polusi sampah laut yang terperangkap di sistem perakaran mangrove. Penelitian ini bertujuan untuk mengidentifikasi jenis dan komposisi sampah laut, menghitung kepadatan, serta memetakan distribusi spasialnya pada ekosistem mangrove. Penelitian dilakukan pada dua lokasi dengan karakteristik yang berbeda, menggunakan metode line transect berdasarkan zonasi pertumbuhan mangrove (seaward, middle, dan landward). Pengolahan data mencakup uji independent samples t-test, regresi polinomial, serta analisis spasial menggunakan citra satelit Sentinel-2A. Hasil Penelitian menunjukkan sampah plastik merupakan jenis dominan (65,86%), diikuti oleh styrofoam (20%) dan karet (9,81%). Lokasi mangrove dekat permukiman memiliki kepadatan sampah yang signifikan lebih tinggi dibandingkan kawasan wisata (p < 0,05). Sampah laut terkonsentrasi pada zona seaward (92,88%) dan menunjukkan hubungan kuat dengan jarak pengambilan sampel dari pantai (R² = 0,83). Vegetasi mangrove yang ditemukan di lokasi penelitian terdiri atas Rhizophora sp., Sonneratia sp., Ceriops sp., dan Lumnitzera sp. yang memiliki karakteristik perakaran berbeda dan berperan dalam proses penjebakan sampah. Penelitian ini memberikan kontribusi dalam penyusunan strategi mitigasi berbasis spasial untuk perlindungan ekosistem mangrove dari tekanan limbah padat.

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