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All Journal Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Silaban, Angeli
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Aerospace Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Sea Level Anomaly Variability Due to Global Climate in the Western Waters of Sumatra Banjarnahor, Samuel Kristian Alfredo; Silaban, Angeli; Verojenases, Fascal; Irkhos, Irkhos; Lizalidiawati, Lizalidiawati
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v69i2.534

Abstract

The western waters of Sumatra are part of the Indonesian waters that directly interact with the Indian Ocean, which is a climatologically complex area due to influenced by various atmospheric and marine phenomena that are seasonal and inter annual. Therefore, the purpose of this study is to analyze the influence of the El Niño Southern Oscillation (ENSO) phenomenon on changes in sea level in Western Sumatra waters during the period of 1997-2023. The data used include sea level anomaly (SLA), Oceanic Niño Index (ONI), and Dipole Mode Index (DMI). The results show that strong El Niño, such as in 1997/1998, cause sea level to drop to - 0.3 meters due to intense upwelling. In contrast, El Niño 2015/2016 increased sea level by + 0.2 meters due to the dominance of down welling. During the La Niña period, sea level rose significantly, reaching 0.3 meters in 2022/23. The long-term trend shows an average sea level rise of 0.056-0.064 meters over the last 26 years, with different variations between regions.
Identification of Seawater Quality Around PLTU Teluk Sepang Outlet Based on Oceanographic Parameters Gerry, Muamar; Silaban, Angeli; Johan, Septi; Lidiawati, Liza
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v69i2.533

Abstract

The heat waste produced by the PLTU is released directly into the ocean, significantly impacting the quality of sea water. This research intends to assess the quality of sea water near the PLTU Teluk Sepang outlet in Bengkulu City using oceanographic parameters. Data collection was conducted in the field at eight sites that represent the area around the PLTU outlet, focusing on parameters such as sea water temperature, salinity, density, pH, and ocean currents. The obtained measurement results were then compared against the standards set by KepMenLH No. 51, 2004. The findings reveal that parameters such as temperature, pH, and salinity did not meet the quality standards necessary for marine biota ecosystems; the average temperature ranges from 33.58 to 35.39 °C, the pH levels were between 8.59 and 8.76, indicating an alkaline condition, and salinity measures between 24.7 and 26.9 ‰, all of which fall below the standards established by KepMenLH No. 51, 2004. This research demonstrates that the discharge of heat waste substantially pollutes the sea water quality around the PLTU Teluk Sepang outlet in Bengkulu City, particularly affecting sea water temperature, which significantly influences the metabolism of marine biota.
Co-Authors Banjarnahor, Samuel Kristian Alfredo Gerry, Muamar Irkhos Irkhos Johan, Septi Lizalidiawati Lizalidiawati Verojenases, Fascal