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All Journal Jurnal Ilmu dan Teknologi Kelautan Tropis Nekton Mestaka: Jurnal Pengabdian Kepada Masyarakat Jurnal Nusantara Berbakti HIRONO : Jurnal Pengabdian Masyarakat Jurnal Laut Pulau Journal of Coastal and Deep Sea Balobe: Jurnal Pengabdian Masyarakat
Ratuluhain, Eva Susan
Jurusan Ilmu Kelautan, Fakultas Perikanan Dan Ilmu Kelautan, Universitas Pattimura
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Environmental Science Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mechanical Engineering Social Sciences Veterinary Other

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Journal : Nekton

 1 
Preliminary modeling of tsunami potential in the Tanimbar Islands Ratuluhain, Eva Susan; Noya, Yunita Angnetjie; Kalay, Degen E.; Hukubun, Ronald Darlly
Nekton Vol 5 No 1 (2025): Nekton
Publisher : Politeknik Negeri Sambas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47767/nekton.v5i1.944

Abstract

The Tanimbar Islands are an area of high tectonic activity and are part of the outer arc island chain formed by subduction in the Banda zone. The presence of the Sorong Fault and Tanimbar Fault around the Tanimbar Islands also affects the level of vulnerability to earthquakes and tsunami hazards. The purpose of this study was to predict the tsunami potential and affected area of the Tanimbar Islands. The method of analyzing the height data and predicting the affected area used COMCOT v1.7 software. Model simulations were performed on the domain layer by using linear equations. Earthquake and fault parameter data were obtained from the USGS website using historical earthquakes dated January 10, 2023. Bathymetry data were obtained from the GEBO website at a resolution of 15-arcsecond (464 m). The model simulation results show that the initial wave height value marked by the red contour is 0.22 m and the lowest low tide value marked by the blue contour is -0.4 m. Based on these results, the tsunami potential in the Tanimbar Islands is not dangerous, as the potentially affected areas in the study area are Selu Island, Woluaru Island, Wotap Island, and Molu Island, as well as the small islands in the western part. The simulation results demonstrate the importance of research related to tsunami hazards that may occur in the future so that appropriate mitigation can be planned for the existence of small islands around the Tanimbar Islands.
Rekonstruksi Tsunami Mentawai dengan Menggunakan COMCOT v1.7 Ratuluhain, Eva Susan; Noya, Yunita A.; Pradjoko, Eko; Rahman, Rahman; Hukubun, Ronald D.
Nekton Vol 2 No 2 (2022): October
Publisher : Politeknik Negeri Sambas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (793.853 KB) | DOI: 10.47767/nekton.v2i2.403

Abstract

Many studies on the Mentawai tsunami have been carried out. Still, not many have reviewed the validation of run-up height compared to the results of field studies in the same year as the Mentawai tsunami on October 25, 2010. The survey of the Mentawai tsunami reconstruction using COMCOT v1.7 aims to validate The tsunami run-up height of the model output was compared with the results of the field study by the GITST Team in 2010. Validation of the model was carried out using the Aida parameter, by calculating the ratio of the comparison between the model output and the field study results. The study location of the model is divided into 3 layers, namely layer01 covering Sipora Island, North Pagai Island, and South Pagai Island, layer02 covering North Pagai Island and South Pagai Island, and layer03 with the focus of observation on Sibigau Island, with bathymetric resolution used for each layer. 464 m, 232 m, and 77 m so that the propagation at the observation site can be seen clearly. The height of the modeled tsunami ranged from 2.5 – 11.2 meters, with a maximum run-up height observed on Sibigau Island of 11.2 meters, and the time range for the tsunami arriving on land was 5 – 15 minutes. The comparison ratio between the model results and the field study is K = 0.9 and k (standard deviation) = 0.16. Based on the comparison ratio, the model output is close to the actual result.
Fluxes of carbon dioxide gases (CO2) in the mangrove soil of Passo Village, Ambon City Rahman, Rahman; Ratuluhain, Eva Susan; Fakaubun, Fahrul Rozy; Soukotta, Imanuel Villian Trayanta
Nekton Vol 4 No 2 (2024): October
Publisher : Politeknik Negeri Sambas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47767/nekton.v2i2.856

Abstract

Mangrove ecosystems play a significant role in carbon absorption. However, the accumulation of organic matter in mangrove sediments undergoes decomposition, which triggers the release of CO2 gas flux. This study aimed to analyze the CO2 gas flux in mangrove sediments of Negeri Passo, Ambon City. Gas data collection was performed using cylinder canopies at the three observation stations. Gas was passed through the syringe five times with an interval of 30s. Gas concentration analysis was carried out using the gas chromatography method, while CO2 flux was analyzed with flux equations referring to slope regression, volume and area of the scope, temperature, molecular weight of the gas, ideal gas settings, and time constants based on gas intake intervals. The results showed that the average CO2 concentration in St. 1 was 465.14 ± 96.52 ppm, and was the lowest compared to St. 2 and St. 3 with values of 638.60 ± 90.05 ppm and 630.98 ± 54.09 ppm, respectively. Meanwhile, the average CO2 flux was 50.44 mg/m2/hour. The largest CO2 gas flux was observed at St. 2 at 103.69 mg/m2/hour. Meanwhile, the lowest flux was found at St. 3, which was 16.24 mg/m2/hour. Based on this, it can be concluded that] the mangrove ecosystem in Negeri Passo has a higher concentration of CO2 gas than the average concentration of climate change stabilization scenarios. However, the CO2 flux was lower than that at other locations in the Ambon Dalam Bay area. In addition, the potential for significant carbon sequestration based on the Tier 1 model approach indicated that mangrove ecosystems in this location play an important role in climate change mitigation.
Co-Authors Degen E. Kalay Eko Pradjoko Fahrul Rozy Fakaubun Frederika S Pello Frijona Fabiola Lokollo Gratia Dolores Manuputty Hukul, Amal P. I Wayan Nurjaya Imanuel Villian Trayanta Soukotta Intan Buton Irma Kesaulya Ivanual M. Wairata Junita Supusepa Kalay, Degen E. Kalay, Degen Erasmus Krisye Pasanea Loupatty, Sven R Loupatty, Sven R. Marlin C Wattimena Marlin Chrisye Wattimena Noya, Yunita A Noya, Yunita A. Noya, Yunita Anganetjie Noya, Yunita Angnetjie Nyoman M N Natih Rahman Rahman Rahman Rahman Rijoly, Fredik Rijoly, Stefanno M A Ronald Darlly Hukubun Saleky, Valentine D Simon Tubalawony Sirajuddin, Nur Tasmiah Sophia N. M. Fendjalang Soukotta, Imanuel Villian Trayanta Syauta, Augastio B. Tuahatu, Juliana W. Valentine D. Saleky Valentine Domaris Saleky Wattimena, Marlin C.