http://repository.ipb.ac.id/handle/123456789/110 2026-07-08T14:43:27Z 2026-07-08T14:43:27Z Andika http://repository.ipb.ac.id/handle/123456789/174257 2026-07-08T12:18:43Z 2026-01-01T00:00:00Z

Analisis Pola Spasial dan Variabilitas Musiman Parameter Oseanografi di Perairan Jawa Timur Andika Perairan Jawa Timur merupakan wilayah yang dipengaruhi oleh interaksi dinamika Laut Jawa dan Samudera Hindia sehingga memiliki variabilitas oseanografi yang kompleks. Penelitian ini bertujuan menganalisis pola spasial dan variabilitas musiman suhu permukaan laut, salinitas permukaan, tinggi permukaan laut, arus permukaan, dan angin, serta mengkaji pengaruh angin Musim Timur terhadap transport Ekman di Perairan Jawa Timur. Penelitian menggunakan data model oseanografi CROCO periode 2004 - 2006 yang divalidasi menggunakan data observasi satelit. Analisis dilakukan secara spasial dan temporal melalui pendekatan klimatologi musiman, Empirical Orthogonal Function (EOF), dan Power Spectral Density (PSD). Hasil penelitian menunjukkan adanya perbedaan karakteristik yang jelas antara perairan utara dan selatan Jawa Timur. Perairan utara memiliki suhu lebih hangat, salinitas lebih rendah, dan tinggi muka laut yang relatif stabil akibat pengaruh perairan dangkal dan masukan air tawar. Sebaliknya, perairan selatan menunjukkan suhu lebih rendah, salinitas lebih tinggi, dan variabilitas tinggi muka laut yang lebih dinamis akibat pengaruh Samudera Hindia dan proses upwelling. Analisis EOF menunjukkan Mode 1 mendominasi variabilitas SPL (81.72%), salinitas (65.19%), dan TPL (78.41%), yang merepresentasikan pengaruh utama sistem monsun. Penguatan angin tenggara pada Musim Timur meningkatkan wind stress dan transport Ekman menjauhi pantai sehingga memicu upwelling yang ditandai oleh penurunan suhu permukaan laut, peningkatan salinitas, dan penurunan tinggi muka laut di selatan Jawa Timur.; The waters off East Java are influenced by the interaction between the dynamics of the Java Sea and the Indian Ocean, resulting in complex oceanographic variability. This study aims to analyse the spatial patterns and seasonal variability of sea surface temperature, surface salinity, sea level, surface currents and wind, as well as to examine the influence of the East Monsoon winds on Ekman transport in the waters off East Java. The study utilised CROCO oceanographic model data from the period 2004 - 2006, validated using satellite observation data. Analyses were conducted spatially and temporally using seasonal climatology, Empirical Orthogonal Function (EOF), and Power Spectral Density (PSD) approaches. The study utilised data from the CROCO oceanographic model for the period 2004–2006, which was validated using satellite observation data. Analyses were conducted spatially and temporally using a seasonal climatology approach, Empirical Orthogonal Function (EOF), and Power Spectral Density (PSD). The results indicate clear differences in characteristics between the northern and southern waters of East Java. The northern waters have warmer temperatures, lower salinity, and relatively stable sea levels due to the influence of shallow waters and freshwater inflow. Conversely, the southern waters exhibit lower temperatures, higher salinity, and more dynamic sea level variability due to the influence of the Indian Ocean and upwelling processes. EOF analysis indicates that Mode 1 dominates the variability of SST (81.72%), salinity (65.19%), and SSH (78.41%), representing the primary influence of the monsoon system. The strengthening of the south-easterly winds during the East Monsoon increases wind stress and Ekman transport away from the coast, thereby triggering upwelling characterised by a decrease in sea surface temperature, an increase in salinity, and a decrease in sea level in the south of East Java.

2026-01-01T00:00:00Z Arahman, Andre Razaq http://repository.ipb.ac.id/handle/123456789/174221 2026-07-08T06:40:07Z 2026-01-01T00:00:00Z

Komposisi dan Tutupan Karang Keras di Area Terumbu Karang Restorasi dan Alami Nusa Penida, Provinsi Bali Arahman, Andre Razaq Perairan Pulau Nusa Penida, Provinsi Bali, merupakan kawasan konservasi dengan ekosistem terumbu karang yang penting serta menjadi lokasi berbagai kegiatan restorasi. Penelitian ini bertujuan mengetahui komposisi dan tutupan karang keras pada area terumbu karang restorasi dan alami di Nusa Penida. Penelitian dilaksanakan pada November 2025 di lima stasiun pengamatan yang mewakili kedua area tersebut. Data dikumpulkan menggunakan metode Line Intercept Transect (LIT) sepanjang 50 m dan pengukuran kualitas perairan secara in situ. Hasil menunjukkan bahwa suhu, salinitas, pH, dan oksigen terlarut berada dalam kisaran yang mendukung pertumbuhan karang. Tutupan karang keras pada area restorasi sebesar 26,63%, sedangkan pada area alami mencapai 54,31%. Area restorasi didominasi Acropora branching yang menunjukkan fase awal pemulihan, sementara area alami memiliki keragaman bentuk pertumbuhan dan genera yang lebih tinggi. Hasil penelitian menunjukkan bahwa restorasi telah mendukung pemulihan terumbu karang, namun kondisinya masih belum menyamai area alami sehingga diperlukan pemantauan secara berkelanjutan.; The waters of Nusa Penida, Bali Province, are a marine conservation area with important coral reef ecosystems and ongoing restoration activities. This study aimed to determine the composition and cover of hard corals in restoration and natural reef areas of Nusa Penida. The study was conducted in November 2025 at five stations representing both reef conditions. Data were collected using the Line Intercept Transect (LIT) method along 50 m transects and in situ water quality measurements. Results showed that temperature, salinity, pH, and dissolved oxygen were within ranges suitable for coral growth. Hard coral cover reached 26.63% in restoration areas and 54.31% in natural areas. Restoration sites were dominated by branching Acropora, indicating an early stage of recovery, whereas natural sites exhibited greater diversity of growth forms and coral genera. These findings indicate that restoration efforts have supported coral reef recovery; however, ecological conditions in restoration areas have not yet reached those of natural reefs, highlighting the need for continuous monitoring.

2026-01-01T00:00:00Z Saputra, Aidil http://repository.ipb.ac.id/handle/123456789/174107 2026-07-06T23:35:49Z 2026-01-01T00:00:00Z

Pemetaan Sebaran dan Kerapatan Mangrove Menggunakan Citra Sentinel-2A di Desa Pantai Mekar, Muara Gembong Saputra, Aidil Desa Pantai Mekar, Kecamatan Muara Gembong merupakan wilayah pesisir dengan risiko abrasi yang tinggi. Banyak upaya rehabilitasi mangrove telah dilakukan namun belum optimal. Salah satu faktor penyebabnya adalah belum meratanya kegiatan rehabilitasi dan penanaman mangrove. Penelitian ini bertujuan menghasilkan peta sebaran dan kerapatan kanopi mangrove melalui kombinasi indeks vegetasi. Penelitian ini memanfaatkan citra Sentinel-2A dengan indeks Mangrove Vegetation Index (MVI), Normalized Difference Water Index (NDWI), Normalized Difference Vegetation Index (NDVI), dan Automatic Mangrove Map and Index (AMMI) untuk menghasilkan peta sebaran dan kerapatan kanopi mangrove yang representatif. Hasil penentuan threshold mangrove menggunakan MVI berada di rentang 4,20–15,13. Hasil pengolahan persentase kerapatan kanopi bervariasi mulai dari 37–90%. Hasil analisis korelasi menunjukkan bahwa kombinasi NDVI dan AMMI menghasilkan model kerapatan kanopi terbaik dengan koefisien korelasi sebesar 0,87 dan RMSE sebesar 0,083. Uji akurasi menggunakan confusion matrix menghasilkan nilai overall accuracy sebesar 83,3% dan koefisien kappa sebesar 0,72. Hasil penelitian menunjukkan total luas mangrove sebesar 182,34 ha, yang terdiri atas kerapatan kanopi jarang (20,12 ha), sedang (119,25 ha), dan rapat (42,97 ha).; Pantai Mekar Village, Muara Gembong District, is a coastal area with a high risk of abrasion. Various mangrove rehabilitation efforts have been implemented, however, the outcomes have not yet been optimal. One contributing factor is the uneven distribution of rehabilitation and mangrove planting activities. This study aimed to produce mangrove distribution and canopy density maps through the combination of vegetation indices. Sentinel-2A imagery was utilized using the Mangrove Vegetation Index (MVI), Normalized Difference Water Index (NDWI), Normalized Difference Vegetation Index (NDVI), and Automatic Mangrove Map and Index (AMMI) to generate representative mangrove distribution and canopy density maps. The mangrove threshold determined using MVI ranged from 4.20 to 15.13. The processed canopy density percentages varied from 37% to 90%. Correlation analysis showed that the combination of NDVI and AMMI produced the best canopy density model, with a correlation coefficient of 0.87 and an RMSE of 0.083. Accuracy assessment using a confusion matrix resulted in an overall accuracy of 83.3% and a kappa coefficient of 0.72. The mapping results indicated a total mangrove area of 182.34 ha, consisting of sparse canopy density (20.12 ha), moderate canopy density (119.25 ha), and dense canopy density (42.97 ha).

2026-01-01T00:00:00Z Nurrahman, Muhammad Kiflan http://repository.ipb.ac.id/handle/123456789/173754 2026-06-30T02:08:43Z 2026-01-01T00:00:00Z

Struktur Komunitas dan Kelimpahan Ikan Chaetodontidae pada Terumbu Karang Berdasarkan Jarak dari Muara Lobang Kelatak di Berau, Kalimantan Timur Nurrahman, Muhammad Kiflan Ekosistem terumbu karang di Kabupaten Berau memiliki variasi posisi geografis yang berpotensi memengaruhi komunitas ikan karang di dalamnya. Penelitian ini bertujuan menganalisis struktur komunitas dan kelimpahan ikan famili Chaetodontidae berdasarkan perbedaan jarak lokasi pengamatan dari muara serta kaitannya dengan kondisi tutupan karang hidup. Pengambilan data dilakukan pada Juni 2025 di 11 Stasiun pengamatan di Kawasan Konservasi Pesisir (KKP3K KDPS).menggunakan metode Underwater Visual Census (UVC) untuk ikan dan Underwater Photo Transect (UPT) untuk tutupan terumbu karang. Hasil penelitian menemukan 12 spesies dengan total 122 individu, Chaetodon octofasciatus menjadi spesies paling dominan. Kelimpahan ikan lebih dipengaruhi oleh kondisi tutupan karang hidup, terdapat Stasiun dengan tutupan karang kerang tinggi menyokong kelimpahan yang lebih stabil, sementara dominasi komponen abiotik pada Stasiun tertentu menekan keberadaan ikan koralivor. Temuan ini menunjukkan bahwa kesehatan terumbu karang merupakan faktor kunci bagi keberlanjutan populasi ikan Chaetodontidae di wilayah tersebut.; The coral reef ecosystem in Berau Regency has varying geographical positions that potentially affect the coral fish communities within it. This study aims to analyze the community structure and abundance of fish in the family Chaetodontidae based on differences in the distance of observation locations from the estuary and its relation to the condition of live coral cover. Data collection was carried out in June 2025 at 11 observation stations in the Coastal Conservation Area (KKP3K KDPS), using the Underwater Visual Census (UVC) method for fish and the Underwater Photo Transect (UPT) for coral reef cover. The study found 12 species with a total of 122 individuals, with Chaetodon octofasciatus being the most dominant species. Fish abundance is more influenced by the condition of live coral cover; there are stations with high hard coral cover supporting more stable abundance, while the dominance of abiotic components at certain stations suppresses the presence of corallivorous fish. This finding indicates that the health of coral reefs is a key factor for the sustainability of Chaetodontidae fish populations in the area. Keywords: abundance, Berau,

2026-01-01T00:00:00Z