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All Journal JFMR (Journal of Fisheries and Marine Research) BULLETIN OF THE MARINE GEOLOGY Jurnal Meteorologi dan Geofisika Bulletin of Geology
Nining Sari Ningsih
Study Program of Oceanography, GM-ITB
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Energy Engineering Environmental Science Physics

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Simulasi Numerik Gelombang Tinggi di Sulawesi Utara Saat Terjadi Siklon Tropis Kimi Menggunakan Model Gelombang SWAN Andariwan, Yogi Muhammad; Ningsih, Nining Sari; Kartadikaria, Aditya Rakhmat
Jurnal Meteorologi dan Geofisika Vol. 25 No. 2 (2024)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v25i2.1104

Abstract

This study investigates wind and wind wave conditions in North Sulawesi waters based on their climatological characteristics and a case study of when high waves occurred during Tropical Cyclone (TC) Kimi. Climatological characteristics are calculated by using ERA5 data and the case study is conducted by simulation using Simulating Waves Nearshore (SWAN) wave model. Model verification was performed by comparing the significant wave height (SWH) from SWAN with observation data from wave buoys in Albatross Bay, Townsville, and Emu Park. The statistical results provide biases of -0.11 m, 0.22 m, and 0.16 m, respectively. The Root Mean Square Error (RMSE) values are 0.14 m, 0.28 m, and 0.23 m, and the correlation coefficients are 0.54, 0.8, and 0.95. During the December- February (DJF) period, wind speed peaks in February (3.0-6.5 m/s), and the SWH reaches 0.5-0.8 m. On 17th of January 2021, Manado's coastline experienced high waves, coinciding with the active phase of TC Kimi near northeastern Australia from 15th to 19th of January 2021. As TC Kimi developed, wind speeds in North Sulawesi increased to 7.0–12 m/s, triggering waves reaching 1.0–1.8 meters with an anomaly of 1–1.5 meters. This wave activity experienced a time lag of +19 hours in response to the wind speeds generated by TC Kimi.
ANALISIS PERUBAHAN GARIS PANTAI AKIBAT PEMBANGUNAN JETTY DI WILAYAH PANTAI KARANGSONG, INDRAMAYU, INDONESIA Abdurrahman, Umar; Ningsih, Nining Sari; Suprijo, Totok; Tarya, Ayi
Bulletin of Geology Vol 5 No 2 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2021.5.2.5

Abstract

Pada tahun 2005 dilakukan pembangunan jetty di muara Sungai Prajagumiwang, tepatnya di Pantai Karangsong, Desa Karangsong, Kecamatan Indramayu, Kabupaten Indramayu, JawaBarat. Pembangunan jetty ini merupakan salah satu solusi dari permasalahan pendangkalan alur pelayaran di wilayah tersebut. Selain berdampak pada aktivitas perikanan setempat, pembangunan jetty ini juga berdampak pada perubahan garis pantai di Pantai Karangsong. Pada penelitian ini, analisis perubahan garis pantai dilakukan dengan memanfaatkan data citra satelit dari Google Earth yang terdiri daritahun 2001, 2008, 2009. 2013, 2014, 2015, 2016, dan 2017. Garis air tinggi dipilih sebagai indikator penentu garis pantai dengan tujuan untuk meminimalisir kesalahan yang dapat terjadi akibat penentuan garis pantai secara manual. Hasil analisis secara kualitatif dan kuantitatif menunjukkan adanya pola perubahan garis pantai yang semula didominasi oleh terjadinya erosi, setelah pembangunan jetty berubah menjadi didominasi oleh akresi. Berdasarkan analisis perubahan luas dan garis pantai yang dilakukan pada penelitian ini, perubahan luas pantai dan garis pantai terbesar terjadi pada periode 2001 –2008 yaitu sebesar 297.136 m2dan 13.897 m. Pada periode 2008 –2017 nilai perubahan luas dan garis pantai menunjukkan kondisi yang berubah ubah dan perubahannya semakin mengecil. Hal ini menunjukkan Pantai Karangsong mengalami proses pantai menuju setimbang. Kata kunci:Perubahan garis pantai, pembangunan jetty, Pantai Karangsong, Google Earth
PERANAN DINAMIKA OSEANOGRAFI DALAM PENGELOLAAN SUMBER DAYA PERIKANAN Ningsih, Nining Sari; Hanifah, Farrah; Kusmarani, Amelia Mustika
JFMR (Journal of Fisheries and Marine Research) Vol. 2 No. 2 (2018): JFMR
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2018.002.02.8

Abstract

Abstrak Dinamika oseanografi di perairan Indonesia seperti arus, front, eddy (a.l., terkait dengan shear velocity dan penjalaran gelombang Rossby), kedalaman termoklin, serta upwelling berdampak pada kesuburan perairan dan selanjutnya akan mempengaruhi pola migrasi, daerah pemijahan, dan kelimpahan ikan pelagis. Selain itu, variabilitas iklim dalam skala waktu intramusiman, musiman, antartahunan, hingga intradecadal, decadal, dan interdecadal berperan terhadap dinamika oseanografi, kesuburan suatu perairan, dan kelimpahan ikan pelagis baik secara spasial maupun temporal. Model hidrodinamika tiga dimensi (3D) yang dikenal dengan sebutan HYbrid Coordinate Ocean Model (HYCOM) digunakan dalam penelitian ini untuk mensimulasikan dinamika elevasi, arus, serta temperatur air laut baik secara spasial (horizontal dan vertikal) maupun temporal. Simulasi model dilakukan selama ± 64 tahun (1950 – 2013) di perairan Indonesia untuk mengetahui variabilitas dan tren jangka panjang perubahan parameter oseanografi yang terjadi akibat perubahan iklim (terkait dengan pemanasan global). Hasil studi ini berguna bagi pengelolaan perikanan, khususnya dapat digunakan sebagai informasi dasar untuk memprediksi pola migrasi ikan pelagis (a.l., tuna) dan kedalaman alat pancing. Kata kunci: dinamika oseanografi, model hidrodinamika 3D, tren, variabilitas iklim
DAMPAK COLD SURGE (CS) TERHADAP NET SURFACE HEAT FLUX (NSHF) DI LAUT NATUNA Agdialta, Rezfiko; Ningsih, Nining Sari; Trilaksono, Nurjanna Joko
Jurnal Meteorologi dan Geofisika Vol. 25 No. 1 (2024)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v25i1.1103

Abstract

Cold Surge (CS) events are often associated with rainfall occurrences in the Jakarta area. However, there is still limited literature on how CS affects other parameters in Indonesia. This study aims to contribute to this literature, particularly regarding the crucial role of CS in the interaction between the ocean and the atmosphere. This research uses the composite difference method to compare changes in Wind Speed (WS), Latent Heat Flux (LHF), Sensible Heat Flux (SHF), Shortwave Radiation (SWR), Longwave Radiation (LWR), and Net Surface Heat Flux (NSHF) during CS phases versus neutral conditions no CS (nCS). The composite difference results indicate an increase in wind speed in the study area, Natuna Sea, with values of 1.17 m/s, 1.45 m/s, and 1.69 m/s for December, January, and February, respectively. This finding explains that the increase in wind speed significantly influences LHF in the negative direction, meaning more LHF is transferred from the ocean to the atmosphere during the CS phase. LHF also predominantly affects NSHF in the study area during the CS period, indicating that more NSHF is leaving the ocean and entering the atmosphere compared to the amount entering the ocean from the atmosphere during the CS phase.
SEASONAL AND INTRA-SEASONAL VARIABILITY OF OCEAN THERMAL POTENTIAL ENERGY IN THE INDONESIAN EXCLUSIVE ECONOMIC ZONE Suprijo, Totok; Napitupulu, Gandhi; Ningsih, Nining Sari; Sinaga, Denny Basardo Jonatan; Rachman, Audi
BULLETIN OF THE MARINE GEOLOGY Vol 39, No 1 (2024)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.39.1.2024.866

Abstract

Ocean thermal energy is a promising marine renewable energy resource that can be developed as a clean energy alternative for Indonesia, which is in the equatorial or tropical region. This study assesses the potential of ocean thermal energy as a renewable energy source in the Indonesian Exclusive Economic Zone (EEZ) by estimating the monthly, seasonal, and intra-seasonal variability of ocean thermal energy conversion (OTEC) resources. The Indonesian EEZ spans from 6°N to 11°S and 95°E to 139°E, covering an area of 3,495,698.72 km². Using temperature data from simulations of the Hybrid Coordinate Ocean Model (HYCOM), the study evaluates the potential of OTEC resources over a 50-year period (from January 1964 to December 2013) with a spatial resolution of 0.125°. Estimation of OTEC potential power resources was based on temperature differences at depths of 20 m and 1000 m, following the hybrid cycle working principle.The results of the estimations indicate that the area has a monthly average potential power of 289.73 GW. The estimation also reveals seasonal and intra-seasonal variability in this potential energy, with fluctuations ranging from 280.09 GW in August to 295.65 GW in December, influenced by phenomena such as ENSO (El Niño Southern Oscillation) and IOD (Indian Ocean Dipole). In the Indonesian EEZ, the average potential thermal power decreases to 288.23 GW during an El Niño event and increases to 291.72 GW during a La Niña event. The IOD phenomenon has a similar effect, with potential decreasing to 281.82 GW during a positive IOD event and rising to 292.64 GW during a negative IOD event.
Co-Authors Abdurrahman, Umar Agdialta, Rezfiko Andariwan, Yogi Muhammad Ayi Tarya Hanifah, Farrah Kartadikaria, Aditya Rakhmat Kusmarani, Amelia Mustika Napitupulu, Gandhi Rachman, Audi Sinaga, Denny Basardo Jonatan Totok Suprijo Trilaksono, Nurjanna Joko