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All Journal Jurnal Ilmu dan Teknologi Kelautan Tropis Jurnal Ilmu-Ilmu Perairan dan Perikanan Indonesia Jurnal Perikanan dan Kelautan Jurnal Teknik Sipil Jurnal Perikanan dan Kelautan
Ivonne M. Radjawane
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Environmental Science Immunology & microbiology Library & Information Science Materials Science & Nanotechnology Physics Social Sciences

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Model Hidrodinamika Pasang Surut di Perairan Kepulauan Bangka Belitung Radjawane, Ivonne M.; Saputro, Bagus S.C.; Egon, Andi
Jurnal Teknik Sipil Vol 25, No 2 (2018)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2123.24 KB) | DOI: 10.5614/jts.2018.25.2.5

Abstract

AbstrakDinamika pasang surut di perairan Kepulauan Bangka Belitung dipengaruhi oleh pasang surut (pasut) dari Laut Cina Selatan dari sebelah utara dan Laut Jawa di sebelah selatan, selain itu terdapat juga pengaruh proses lokal akibat perairan dangkal dan selat sempit. Untuk mengetahui pola dan dinamika pasut yang di perairan Bangka Belitung, dilakukan simulasi model numerik delapan komponen pasut (M2, S2, K1, O1, N2, P1, K2, dan Q1) selama 14 hari (4 - 17 Januari 2009). Simulasi menggunakan model DHI MIKE21 Flow FM, yaitu model hidrodinamika dua dimensi horisontal dengan skema mesh fleksibel. Syarat batas model diperoleh dari Oregon State University Tidal Inversion Software (OTIS) yang dikenal sebagai program Tidal Model Driver (TMD. Hasil dari simulasi model divalidasi terhadap data lapangan pada enam stasiun Babel Ocean Observation and Technologies (BOOST) Center. Hasil simulasi model menunjukkan bahwa pola pasang surut di perairan Kepulauan Bangka Belitung didominasi oleh tipe harian tunggal (diurnal) dengan komponen pasang surut K1 yang terbesar kemudian diikuti oleh komponen O1. Hasil simulasi model juga menunjukkan bahwa dinamika pasang surut pada perairan Bangka Belitung dipengaruhi oleh dinamika Laut Cina Selatan yang memiliki pola pasang surut harian tunggal (diurnal), dimana komponen terbesar K1 terdispersi dari Laut Cina Selatan menuju Selat Karimata dan perairan Bangka Belitung.AbstractTidal dynamics in Bangka Belitung Archipelago waters is influenced by the tidal from South China Sea from the north, the Java Sea from the south, and local processes due to shallow water and narrow strait. To understand the tidal dynamics in Bangka Belitung waters, a numerical model has been simulated with 8 major tidal constituents (M2, S2, K1, O1, N2, P1, K2, and Q1) for a period of 14 days (4 to 17 January 2009). The simulation was carried out using DHI’s MIKE 21 Flow FM software, a 2-dimension flexible mesh hydrodynamic model. The model boundary conditions were obtained from the Oregon State University Tidal Inversion Software (OTIS), also known as the Tidal Model Driver (TMD). The model has been validated against measurement in six stations of BOOST Center (Babel Ocean Observation and Technologies). The simulation results show that the tidal dynamic in Bangka Belitung waters is dominated by diurnal tidal constituent, with K1 is the largest tidal constituent then followed by O1. The result also indicates that the tidal dynamic in Bangka Belitung waters is dominated influenced by the diurnal constituents K1 coming from the South China Sea dispersed towards the Karimata Strait and Bangka Belitung water.  
Studi Dinamika Ekosistem Perairan Di Teluk Lampung: Pemodelan Gabungan Hidrodinamika-Ekosistem Alan Frendy Koropitan; Safwan Hadi; Ivonne M. Radjawane; Ario Damar
Jurnal Ilmu-Ilmu Perairan dan Perikanan Indonesia Vol. 11 No. 1 (2004): Juni 2004
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (762.003 KB)

Abstract

Penelitian ini bertujuan untuk mengkaji dinamika ekosistem perairan di Teluk Lampung dengan menggunakan gabungan model hidrodinamika-ekosistem dengan pendekatan numerik. Secara umum, hasil simulasi pola arus residu M2 cenderung masuk dari mulut teluk sebelah barat, sebagian terus memasuki sampai kepala teluk dan sebagian keluar kembali dari mulut teluk bagian timur. Selain itu, terlihat pula adanya suatu eddy yang mengalir berlawanan arah jarum jam di sekitar kepala teluk. Pola penyebaran masing-masing kompartimen ekosistem hasil model memiliki kesamaan dengan hasil pengamatan di lapangan, serta konsisten dengan pola arus residu M2. Pengaruh suplai dari sungai, interaksi antara proses biologis seperti produktifitas primer, sekunder (pemangsaan), kematian alami plankton, serta proses dekomposisi oleh bakteri belum begitu berperan dalam neraca dan standing stock ekosistem di Teluk Lampung. Peranan suplai dari laut lebih dominan dibanding dengan proses-proses biokimiawi yang berinteraksi di dalam teluk. Hasil perhitungan tingkat efisiensi aliran energi dari proses dekomposisi dan produksi urine zooplankton ke produktifitas primer mengalami kehilangan sebesar 30.48 %, sementara dari produktifitas primer ke produktifitas sekunder (pemangsaan) mengalami penambahan 17.24 %.Kata kunci: dinamika ekosistem, Teluk Lampung, gabungan model hidrodinamika-ekosistem, arus residu M2.
SEASONAL SURFACE GEOSTROPHIC CURRENT IN ARAFURA-TIMOR WATERS Fachry Ramadyan; Ivonne M. Radjawane
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 5 No. 2 (2013): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (635.595 KB) | DOI: 10.29244/jitkt.v5i2.7556

Abstract

Research on the seasonal geostrophic surface current during 2002-2011 in Arafura-Timor waters was conducted using satellite altimetry data. Those data were absolute dynamic topography and absolute geostrophic velocity data taken from Archiving Validation and Interpretation of Satellite Oceanographic data (AVISO). The dynamics of geostrophic surface current varied in every monsoon due to the difference in absolute dynamic topography. During  northwest (NW) season, the absolut dynamic topography in Arafura Sea was higher than in Timor Sea by an average difference of 0.1–0.2 m and the geostrophic surface current moved from Arafura Sea toward Timor Sea. During southeast (SE) season, the absolute dynamic topography in Arafura Sea lower than Timor Sea with an average difference of   0.03-0.04 m. In this season, upwelling occurs  in Banda  Sea and sea surface  water in this region  becomes  lower and  the current moved from  Arafura Sea  to Banda  Sea. The absolut dynamic topography difference between Arafura Sea and Timor Sea in NW and SE monsoons was 0.05–0.06 m and so the geostrophic surface current moved from Arafura Sea toward Timor Sea. In Timor Sea, the current moved southwest towards the Indian Ocean. In NW and SE Monsoons the the velocity of surface geostrophic current in  Timor  Sea  (0,3 m/sec) was  higher compare in Arafura Sea (0.2 m/sec)  due to the configuration of island  surround  the Timor Sea  and  its topography. Keywords: Geostrophic surface current, altimetrysatellite, Arafura-Timor Sea 
Subsurface Marine Heatwaves of South Java Sea: Trend, Frequency, Duration, and Cumulative Intensity Based on Assimilation Model (1993-2019) Azuga, Nabila Afifah; Radjawane, Ivonne M.
Jurnal Perikanan dan Kelautan Vol. 27 No. 3 (2022): October
Publisher : Faculty of Fisheries and Marine, Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/

Abstract

Marine heatwaves (MHWs) are extreme warming events in the ocean when the temperature detected is above the 90th percentile of climatological temperature for at least five consecutive days. MHWs events can extend up to thousand kilometers and have been detected in the subsurface layer. MHWs are described by metrics (frequency, duration, and cumulative intensity). The purpose of this study was to determine the characteristics of MHWs in the subsurface layer for 27 years (1993-2019). The data used in this study is the sea water temperature data of the depth 0,4m-763m from Marine Copernicus Global Ocean Physics and Niño 3.4 indices. The method used in this study is a statistical method to calculate the average and trend of the MHWs metric. The results of this study denotes that the occurrence of MHWs at a depth of 0.4m-92m is caused by ENSO (El Niño Southern Oscillation) positive phase (El Niño) with a delay of 7-8 months and at a depth of 109m-763m caused by negative phase ENSO (La Niña) with a delay of 1-3 months. It was also found that the frequency of MHWs was higher at a depth of 418m-763m with a maximum value is 2,6 events/year, the duration of MHWs was greater at a depth of 0,4m-77 m, with a maximum value of duration is 30-32 days/year, and the maximum cumulative intensity of MHWs events for 27 years is 90˚C. During the 1993-2019, the trend of frequency, duration, and cumulative intensity of MHWs in the subsurface layer of south Java Sea has significantly increased.
Subsurface Marine Heatwaves of South Java Sea: Trend, Frequency, Duration, and Cumulative Intensity Based on Assimilation Model (1993-2019) Azuga, Nabila Afifah; Radjawane, Ivonne M.
Jurnal Perikanan dan Kelautan Vol. 27 No. 3 (2022): October
Publisher : Faculty of Fisheries and Marine, Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/

Abstract

Marine heatwaves (MHWs) are extreme warming events in the ocean when the temperature detected is above the 90th percentile of climatological temperature for at least five consecutive days. MHWs events can extend up to thousand kilometers and have been detected in the subsurface layer. MHWs are described by metrics (frequency, duration, and cumulative intensity). The purpose of this study was to determine the characteristics of MHWs in the subsurface layer for 27 years (1993-2019). The data used in this study is the sea water temperature data of the depth 0,4m-763m from Marine Copernicus Global Ocean Physics and Niño 3.4 indices. The method used in this study is a statistical method to calculate the average and trend of the MHWs metric. The results of this study denotes that the occurrence of MHWs at a depth of 0.4m-92m is caused by ENSO (El Niño Southern Oscillation) positive phase (El Niño) with a delay of 7-8 months and at a depth of 109m-763m caused by negative phase ENSO (La Niña) with a delay of 1-3 months. It was also found that the frequency of MHWs was higher at a depth of 418m-763m with a maximum value is 2,6 events/year, the duration of MHWs was greater at a depth of 0,4m-77 m, with a maximum value of duration is 30-32 days/year, and the maximum cumulative intensity of MHWs events for 27 years is 90˚C. During the 1993-2019, the trend of frequency, duration, and cumulative intensity of MHWs in the subsurface layer of south Java Sea has significantly increased.
Subsurface Marine Heatwaves of South Java Sea: Trend, Frequency, Duration, and Cumulative Intensity Based on Assimilation Model (1993-2019) Azuga, Nabila Afifah; Radjawane, Ivonne M.
Jurnal Perikanan dan Kelautan Vol. 27 No. 3 (2022): October
Publisher : Fakultas Perikanan dan Kelautan Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/

Abstract

Marine heatwaves (MHWs) are extreme warming events in the ocean when the temperature detected is above the 90th percentile of climatological temperature for at least five consecutive days. MHWs events can extend up to thousand kilometers and have been detected in the subsurface layer. MHWs are described by metrics (frequency, duration, and cumulative intensity). The purpose of this study was to determine the characteristics of MHWs in the subsurface layer for 27 years (1993-2019). The data used in this study is the sea water temperature data of the depth 0,4m-763m from Marine Copernicus Global Ocean Physics and Niño 3.4 indices. The method used in this study is a statistical method to calculate the average and trend of the MHWs metric. The results of this study denotes that the occurrence of MHWs at a depth of 0.4m-92m is caused by ENSO (El Niño Southern Oscillation) positive phase (El Niño) with a delay of 7-8 months and at a depth of 109m-763m caused by negative phase ENSO (La Niña) with a delay of 1-3 months. It was also found that the frequency of MHWs was higher at a depth of 418m-763m with a maximum value is 2,6 events/year, the duration of MHWs was greater at a depth of 0,4m-77 m, with a maximum value of duration is 30-32 days/year, and the maximum cumulative intensity of MHWs events for 27 years is 90˚C. During the 1993-2019, the trend of frequency, duration, and cumulative intensity of MHWs in the subsurface layer of south Java Sea has significantly increased.
Subsurface Marine Heatwaves of South Java Sea: Trend, Frequency, Duration, and Cumulative Intensity Based on Assimilation Model (1993-2019) Azuga, Nabila Afifah; Radjawane, Ivonne M.
Jurnal Perikanan dan Kelautan Vol. 27 No. 3 (2022): October
Publisher : Fakultas Perikanan dan Kelautan Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/

Abstract

Marine heatwaves (MHWs) are extreme warming events in the ocean when the temperature detected is above the 90th percentile of climatological temperature for at least five consecutive days. MHWs events can extend up to thousand kilometers and have been detected in the subsurface layer. MHWs are described by metrics (frequency, duration, and cumulative intensity). The purpose of this study was to determine the characteristics of MHWs in the subsurface layer for 27 years (1993-2019). The data used in this study is the sea water temperature data of the depth 0,4m-763m from Marine Copernicus Global Ocean Physics and Niño 3.4 indices. The method used in this study is a statistical method to calculate the average and trend of the MHWs metric. The results of this study denotes that the occurrence of MHWs at a depth of 0.4m-92m is caused by ENSO (El Niño Southern Oscillation) positive phase (El Niño) with a delay of 7-8 months and at a depth of 109m-763m caused by negative phase ENSO (La Niña) with a delay of 1-3 months. It was also found that the frequency of MHWs was higher at a depth of 418m-763m with a maximum value is 2,6 events/year, the duration of MHWs was greater at a depth of 0,4m-77 m, with a maximum value of duration is 30-32 days/year, and the maximum cumulative intensity of MHWs events for 27 years is 90˚C. During the 1993-2019, the trend of frequency, duration, and cumulative intensity of MHWs in the subsurface layer of south Java Sea has significantly increased.
Co-Authors Alan Frendy Koropitan Andi Egon, Andi Ario Damar Fachry Ramadyan Nabila Afifah Azuga Safwan Hadi Saputro, Bagus S.C.