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All Journal MANAJEMEN HUTAN TROPIKA Journal of Tropical Forest Management Jurnal Ilmu Pertanian Indonesia Jurnal Teknologi Perikanan dan Kelautan Jurnal Ilmu dan Teknologi Kelautan Tropis Jurnal Ilmu-Ilmu Perairan dan Perikanan Indonesia Forum Pasca Sarjana Maspari Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Jurnal Ilmu Lingkungan POSITRON Biologi Edukasi : Jurnal Ilmiah Pendidikan Biologi Maspari Journal JAM : Jurnal Aplikasi Manajemen Al-Ahkam Jurnal Perikanan dan Kelautan Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Widyariset Jurnal Kelautan Tropis BERITA BIOLOGI Journal of Applied Geospatial Information JURNAL ENGGANO Omni-Akuatika MAJALAH ILMIAH GLOBE BULLETIN OF THE MARINE GEOLOGY Jurnal Pengelolaan Perikanan Tropis (Journal Of Tropical Fisheries Management) Dinamika Maritim Jurnal Penelitian Perikanan Indonesia Jurnal Kelautan Nasional Jurnal Segara Jurnal Sosial Ekonomi Kelautan dan Perikanan Jurnal Penginderaan Jauh dan Pengolahan Data Citra Digital International Journal of Remote Sensing and Earth Sciences (IJReSES) JURNAL METEOROLOGI DAN GEOFISIKA STI Policy and Management Journal Widyariset Jurnal Bali Membangun Bali COJ (Coastal and Ocean Journal) Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Depik Jurnal Ilmu-Ilmu Perairan, Pesisir, dan Perikanan Journal of Fisheries & Marine Jurnal Meteorologi dan Geofisika Jurnal Penginderaan Jauh dan Pengolahan Data Citra Digital The International Journal of Remote Sensing and Earth Sciences (IJReSES)
I Wayan Nurjaya
Bogor Agricultural University
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CHARACTERISTICS AND VARIABILITY OF SENTINEL-1A OBSERVATION INTERNAL WAVES: POLICY IN THE MANAGEMENT OF THE HALMAHERA MARINE AREA, NORTH MALUKU (2015-2023) Rohani, Siti; Nurjaya, I Wayan; Naulita, Yuli; Karang, I Wayan Gede Astawa
Jurnal Penelitian Perikanan Indonesia Vol 31, No 4 (2025): (Desember 2025)
Publisher : Politeknik Kelautan dan Perikanan Karawang, BRSDM KP.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jppi.31.4.2025.186-197

Abstract

The waters of Halmahera, North Maluku have potential for the formation of internal waves. The uneven topographic conditions act as a trigger for the generation of internal waves. The Sentinel-1A Synthetic Aperture Radar (SAR), with its advantage of being unaffected by clouds and usable in various weather conditions, is capable of mapping the location of formation and the propagation characteristics of internal waves. The aim of this study is to understand the characteristics and variability of internal waves in the waters of Halmahera, North Maluku. SAR analysis results from the period 2015-2023 show that the dominant generation of internal waves occurs in the south of Halmahera, namely Obi Island, and also in the northeast of Halmahera, namely the Weda Strait, resulting in 74 packets being successfully identified. High interannual variability occurred in 2019, whereas high seasonal variability occurred in the eastern season, namely August. The characteristics of internal wave parameters revealed a maximum phase speed of 4.88 m/s and a minimum of 0.19 m/s, predominantly occurring during the rising tide, when the tide reaches 0.60 meters and the ebb -0.06 meters. The interaction of tides and topography results in density stratification in the thermocline layer at depths of less than 200 meters.
Sedimentation Profile in Coastal Water Jakarta Bay: Profil Sedimentasi Perairan Pesisir Teluk Jakarta Yonvitner; Hariyadi, Sigid; Agus, Syamsul Bahri; Nurjaya, I Wayan; Abdul Aziz, Nandi
Jurnal Pengelolaan Perikanan Tropis (Journal of Tropical Fisheries Management) Vol 6 No 1 (2022): Journal of Tropical Fisheries Management
Publisher : Departement of Aquatic Resources Management, Faculty of Fisheries and Marine Sciences, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jppt.v6i1.43452

Abstract

The waters of Jakarta Bay are one of the waters that are influenced by several fresh water flows that enter from the DKI Jakarta area and its surroundings. Sediment that enters the waters of Jakarta Bay is produced by the activities of the people who live in the Jakarta area and its surroundings. This study aims to analyze the sedimentation and distribution of suspended solids in the Jakarta Bay estuary using an observational approach and spatial analysis. This study uses the Inverse Distance Weighting (IDW) interpolation method. The dominant distribution of sediment in Jakarta Bay is sand with a size ranging from 0.25 to 0.125 mm. TSS (Total Suspended Solids) levels in 11 estuaries in Jakarta Bay ranged from 21 to 150 mg/L in first period and 11 ˗ 259 mg/L in second period. Sedimentation rates that occurred in 11 Jakarta Bay estuaries ranged from 11.12 g/cm2/day to 619.5 g/cm2/day in period one and 10.96 g/cm2/day to 1232.06 g/cm2/day in the second period which is located in Muara Cilincing in both periods. There is a suitable relationship between the TSS value and the sedimentation rate. Estuary TSS values and sedimentation rates are influenced by seasons and anthropogenic activities that occur in the estuary such as reclamation.
COASTLINE CHANGES IN INDRAMAYU REGENCY BETWEEN 1989-2019 Kusnanto; Setiawan, Yudi; Nurjaya, I Wayan
Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Vol 12 No 3 (2022): Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (JPSL)
Publisher : Pusat Penelitian Lingkungan Hidup, IPB (PPLH-IPB) dan Program Studi Pengelolaan Sumberdaya Alam dan Lingkungan, IPB (PS. PSL, SPs. IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jpsl.12.3.543-554

Abstract

Basically, coastline changes include accretion (raised soil) and abrasion. This study aims to analyze coastline changes in the Indramayu Regency between 1989 and 2019, as well as the causing factors. The secondary data were obtained from Landsat 5 Satellite Imagery in 1989, 1999, 2009, and Landsat 8 in 2019. This analysis used BILKO method, which is a Landsat image analysis to separate land and sea areas. Then overlay method, which was used to delineate boundary. Spatial analysis showed coastline changes in the Indramayu regency of both accretion and abrasion. In the 1989-1999 period, there was an accretion of 319 ha, while there was an abrasion 1291 ha. Furthermore, in the 1999-2009 period, there was an accretion of 349 ha, and abrasion of 1125 ha. Also, in the 2009-2019 period, there was an accretion of 698 ha, and abrasion of 358 ha. Meanwhile, the factors that cause coastline changes are natural such as wind, waves, currents, as well as human factors such as the conversion of mangrove land to ponds and also planting activities. Therefore, efforts made by the government are making waves containment tool and planting mangrove vegetation.
Mapping and validation of spatial algorithm for monitoring turbidity of seagrass habitat using sentinel-2B imagery in Ternate Island Rustam Effendi Paembonan; Dietriech Geoffrey Bengen; I Wayan Nurjaya; Syamsul Bahri Agus; Nyoman Metta N Natih; Beginer Subhan; Joko Santoso
Depik 2025: Special Issue ICMF
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.0.0.46989

Abstract

Turbidity is a parameter of the marine environment that greatly affects the condition of seagrass whose habitat is an intertidal zone in shallow sea waters. Seagrass is an important type of ecosystem that can be found in several coastal areas of Ternate Island. This study aims to analyze the turbidity conditions of seagrass habitat waters and apply a remote sensing algorithm using Sentinel 2B images. The turbidity research method was carried out by field measurements. The turbidity algorithm model used refers to references with mathematical equations (Rrs665-0.014)/0.013, and the development of a new algorithm as a comparison algorithm. Both algorithms were validated with field data to determine the level of accuracy using the Normalized Mean Absolute Error (NMAE) and determination coefficient (R2). The results were obtained from turbidity data with values ranging from 0.3 NTU to 1.5 NTU with an average value of 0.87 0.45 NTU. The Sentinel 2B image in this study was restored with geometric corrections, atmosphere, radiometric digital values, land masking, and sun glint. The turbidity algorithm model used obtained good accuracy in mapping and monitoring the turbidity of seagrass habitat waters on Ternate Island. The application of the turbidity algorithm used as a reference in this study has an NMAE value of 50.44 and R2 of 0.8822, while the newly discovered turbidity algorithm has an NMAE value of 29.38 and R2 of 0.8827.Keywords:remote sensingecosystemscoastalsedimentationNorth Maluku
Preliminary study oceanography and environmental parameters of habitat endemic species Halmahera walking shark (Hemiscyllium halmahera) on Indopacific Ocean Area in North Maluku Indonesia Nyoman Metta N Natih; Nebuchadnezzar Akbar; Dietriech G Bengen; I Wayan Nurjaya; Riyadi Subur; Abdurrachman Baksir; Firdaut Ismail; Iswandi Wahab; Dondy Arafat; Rustam E Paembonan; Abdul Ajiz Siolimbona; Rasidi Rasidi; Asep Sandra Budiman; Beginer Subhan
Depik 2025: Special Issue ICMF
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.0.0.46913

Abstract

The Halmahera Walking Shark (Hemiscyllium halmahera) is an endemic species in the Halmahera Sea. Information related to the environment in general has not been described in a complex manner. The environment is the main factor to support the life of biota. Environmental characteristics are a determining factor in the sustainability of biota. The study aims to provide information related to the physical environment of the habitat of the H. halmahera species. Primary data collection was carried out directly (in situ). Current data was taken using the Lagrange method using a currents drogue. Tides using tidal palms and observed for 24 hours. Secondary data was taken from Marine Copernicus and the Geospatial Information Agency (BIG). All data were tabulated and analyzed by Ocean Data View (ODV) software. The results of the study found that the surface current velocity was found to be in the fast current category. Current speed descriptively provides information on the life of H. halmahera. Primary data shows that the direction of the surface current moves to the east and north. Secondary data in vertical distribution shows weak zonal and meridional current shifts. The tidal pattern was found to be two high and low tides (semidiurnal). The distribution of surface temperature was found to be around 30-32oC. The vertical temperature profile found three layers, namely 1-13m (30oC), 65m (25oC) and 71m (20oC). The chemical environment showed all normal variables. The physical and chemical environmental conditions support H. halmahera to inhabit the sea area of Morotai Island. The environmental description has provided a brief understanding of how the ecological role of the H. halmahera species. Management and sustainability of the environment in the future due to climate change can be done with information on habitat characteristics.Keywords:coral triangleHalmaheranicheNorth Malukutropical
Condition and zonation of mangrove ecosystems in the small islands around the area crossed by the equatorial line of North Maluku Province Najamuddin Najamuddin; Abdurrachman Baksir; Nebuchadnezzar Akbar; Firdaut Ismail; Abdul Ajiz Siolimbona; Dondy Arafat; Rustam E Paembonan; Raismin Kotta; Beginer Subhan; Irmalita Tahir; Nyoman MN Natih; Eko S Wibowo; Ikbal Marus; I Wayan Nurjaya; Dietriech Geoffrey Bengen
Depik Vol 13, No 2 (2024): AUGUST 2024
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.13.2.32075

Abstract

The South Halmahera Islands feature a comprehensive marine coastal ecology. The ecosystems found were seagrass, mangrove and coral reef ecosystems. The components that sustain the existence of this ecosystem are employed equitably because of its geographical location on the equator. Mangrove ecosystems that provide benefits directly and indirectly to the community. The purpose of this study was to determine the condition of the mangrove ecosystem based on the hemispherical photography method and the type of zonation. Tawabi Island, Kayoa, South Halmahera Regency served as the site of the equator research. The research station is determined as many as 3 stations. Mangrove percent cover canopy using the hemispherical photography and transect quadrant for density. Field data gathering procedures with transects drawn perpendicular from the sea to the land. Zonation characteristics and thickness using zone tracking. Density mangrove using ecology analysis and zonation using canvas 9.0. The results of the research founded were Rhizophora apiculata, Rhizophora mucronata and Sonneratia alba. Mangrove percent cover canopy were good category (75-81%), where station I (75%), station II (81%) and station III (77%). Station I having 600 trees per ha, station II having 500 trees per ha, and station III having 400 trees per ha (low density category). Mangroves were found in 3 zones Sonneratia alba, Rhizophora apiculata and Rhizophora mucronata. The mangrove thickness from sea to land at station I (65 meters), station II (69 meters) and station III (42 meters).Keywords:biodiversitycoastalequator lineHalmaheratropical
Co-Authors . Sukenda Abdul Ajiz Siolimbona Abdul Ajiz Siolimbona Abdul Aziz, Nandi Abdurrachman Baksir Abdurrachman Baksir Abdurrachman Baksir, Abdurrachman Adi Purwandana Adi Purwandana Adibrata, Sudirman Adil Mahfudz Firdaus Adil Mahfudz Firdaus Adil Mahfudz Firdaus Agus Atmadipoera Agus Saleh Atmadipoera Agus Sholeh Atmadipoera Ahmad Herison Akmala Dwi Nugraha Alan Frendy Koropitan Alimuddin, Alimuddin Amir Yarkhasy Yuliardi Andhi Setyonugroho Andi Agussalim, Andi Andri Purwandani Aprilia, Jesikha Dwi Ari Purbayanto Ariane Koch-Larrouy Ario Damar Asep Sandra Budiman Asep Sandra Budiman Asep Sandra Budiman, Asep Sandra Baharuddin Baharuddin Bambang Kanti Laras Beale, Calvin S. Beginer Subhan Bengen, Detriech G Darmiati Dedi Sugianto Denny Alberto Satrya Gumay Derek Soto Dietrich G Bengen Dietriech G. Bengen Dietriech G. Bengen Dietriech Geoffrey Bengen Dondy Arafat Dwiyoga Nugroho Eddy Supriyono Edi Kusmanto Eko S Wibowo Enang Harris Surawidjaja ESTY KURNIAWATI Esty Kurniawati Ety Parwati Ety Parwati Ety Parwati Ety Parwati Ety Parwati fadli syamsudin Fani Safitri Ferawati Runtuboi Ferdy Gustian Firdaus, Adil M. Firdaut Ismail Firdaut Ismail Franto Novico Fredinan Yulianda Hari, Restu Fajar Harpasis S Sanusi Harpasis S Sanusi Harpasis s. Sanusi Hefni Effendi Heron Surbakti Heron Surbakti Hidayat Pawitan Holyness Nurdin Singadimedja HS, Surjono I Gusti Bagus Wiksuana I Made Budiasa I Nyoman Kanca I Wayan Gede Astawa Karang Ida Bagus Made Baskara Andika IG Wayan Adiwilaga Ikbal Marus Ikbal Marus, Ikbal Indra Jaya Indra Jaya Indra Jaya Indra Jaya Irmalita Tahir Irmalita Tahir, Irmalita Irzal Effendi Ismail, Firdaut Ismudi Muchsin Ismudi Muchsin Iswandi Wahab John I Pariwono Joko Purwanto Joko Santoso Jonson Lumban Gaol Kadarwan Soewardi Kadarwan Soewardi Kadarwan Soewardi Kadarwan Soewardi Kadarwan Soewardi Kasman Kasman Khairunnisa Khairunnisa Kholil Kholil Kholil Kholil Kotta, Raismin Krisna Rendi Awalludin Kusnanto La Ode Nurman Mbay Leica Febby Shafitri Leni Maryani Lerma Yuni Siagian Luky Adrianto M. Zairin Junior Mahdi Kartasasmita Mahdi Kartasasmita Mahdi Kartasasmita Mahdi Kartasasmita Mahdi Kartasasmita Manalu, Janviter Marimin , Mario Putra Suhana Mennofatria Boer Muh. Adhim Adrian Muh. Ishak Jumarang Muhamad Muliadi Muhammad Agus Muljanto MUHAMMAD AGUS SUPRAYUDI Muhammad Marzuki Mulia Purba Mulia Purba Mulia Purba Mursalin Mursalin N Natih, Nyoman Metta N, Furqan Najamuddin N Najamuddin Najamuddin Najamuddin Najamuddin, Najamuddin Nebuchadnezzar Akbar Neviaty P Zamani Neviaty P. Zamani Noor, Hariansyah Nugraha, Teguh Nur Asia Umar Nur Audina Nyoman M N Natih Nyoman M.N Natih Nyoman Metta N Natih Okgareta, Dema Paembonan, Rustam E Paputungan, Mohammad Sumiran Pramudyo Dipo Raismin Kotta Rasidi Rasidi Rasidi, Rasidi Rastina Ratu Almira Kismawardhani Ratuluhain, Eva Susan Restu, Yunan Gilang Richardus F Kaswadji Richardus F. Kaswadji Ridha Alamsyah Rikardi, Novit Riris Aryawati Risandi Dwirama Putra Rita Rafni Riyadi Subur, Riyadi Robin Saputra Robinson Sitepu Rustam E Paembonan Rustam E Paembonan Rustam Effendi Paembonan Rustam Effendi Paembonan, Rustam Effendi Saenudin Sakka Sakka Salnuddin Salnuddin, Salnuddin Salsabila, Unik Hanifah Salsabilah, Raisyah Santi Susanti, Santi Satria Yukiadi Santoso Septy Heltria Setyo Handayani Setyo Handayani Sigid Hariyadi Siolimbona, Abdul Ajiz Siti Rohani Solihin Solihin Soma Somantri Sucantra, Made Bayu Sugeng Budiharso Sugeng Budiharsono Suhaemi Supriyono, Supri Surjono HS Syamsul Bahri Agus, Syamsul Bahri Tri Hartanto Tri Prartono Tridoyo Kusumastanto Try Al Tanto Try Al Tanto Try Al Tanto Vincentius P Siregar Vincentius Siregar Wahab, Iswandi Wahyu W Pandoe Wang, Zheng Wibowo, Eko S Widodo S. Pranowo Yidoatimojo, Sudibyo Yogi Cahyo Ginanjar Yonvitner - Yudi Setiawan Yuli Naulita Yusli Wardiatno Zibar, Zan Zulfikar, Andi