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All Journal IJOCE (International Journal of Offshore and Coastal Engineering)
Shade Rahmawati
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Engineering

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Gorlov Water Turbine Application in Ambon, Kepulauan Maluku; A Hypothetical Project Wisnu Wardhana; Zahra Aisyiyah Rahayu; Shade Rahmawati
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 6, No 1 (2022)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i1.13150

Abstract

As energy demand increases, it must be balanced with sufficient energy sources to support the growth of Indonesia's electrification ratio. No exception with the development of energy demand and supply on Ambon, Maluku Islands. This study uses a Renewable Energy Power Plant, a water turbine that uses ocean currents from the flow path of an artificial canal plan in Ambon, Maluku Islands. The shape of the area is interesting things to make an artificial canal as a flow path for ocean currents from the different height at that location. Due to the height difference cannot be determined with certainty, in this study, the authors vary the height difference between the sea in the east and west, it's 1m to 5m. Current modelling uses a numerical approach using the Surface-Water Modeling System (SMS) 8.1 software simulation. Then the average current velocity in the canal in each height variation obtained. The experimental data from journal references are used in calculating the turbine torque for a full-scale afterwards adjusted to the current speed generated in each variation. The turbine with the greatest torque is selected, owned by the 4-blades Gorlov NACA0012 with 25% efficiency and 9.5m turbine diameter totalling 1 unit.
Health and Safety Analysis for Fisherman in East Surabaya, Indonesia Santi Frestiqauli; Daniel Mohammad Rosyid; Wimala Lalitya Dhanistha; Anita Kusuma Wardhani; Shade Rahmawati; Madea Eka Silfiani
International Journal of Offshore and Coastal Engineering Vol. 10 No. 1 (2026):
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962//j225800914.v10i1.9919

Abstract

The number of fishermen in Indonesia has continued to decline in the last decade as reported by the Statistics of Marine and Coastal Resources 2021. In 2010 the number of fishermen was recorded at 2.16 million people. But in 2019, the number was recorded at only 1.83 million people. Thus, there was a decrease in the number of fishermen by 330,000 people in 2010-2019. The fisheries sector is one of the most dangerous industries. In contrast, the health and safety of the people, especially fishermen are too far below occupational health and safety feasibility standards. This research used job safety analysis method for hazard identification and risk assessment for fisherman activities during preparation, operation, and pasca-operation. Data were collected through observation and interview 30 fishermen in East Surabaya. Results of observations divided by three activities shows that fishermen don’t prepare themselves with safety kit or safety equipment, including for personal protective equipment. The conclusion is most potential hazards could be minimized by using personal protective equipment. To minimize the risk of fatality, fishermen should carry a first aid kit, and communication devices and should be accompanied when going to sea. There are future research and program to increase fisherman awareness prior to safety.
Study Of Water Distribution Patterns and Temperature Changes in Waters Around Power Plant (Case Study of PLTU Tanjung Jati B Unit 5 & 6) Fajar Lemanza Djazuli; Mukhtasor; Shade Rahmawati
International Journal of Offshore and Coastal Engineering Vol. 9 No. 2 (2025):
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962//j225800914.v9i2.8928

Abstract

Sea cooling discharge refers to heated wastewater produced during the operational of a Steam Power Plant (PLTU). This effluent is typically discharged into the sea via an ocean outfall, a process that can significantly impact the surrounding marine environment and ecosystems. One of the primary consequences of this discharge is the elevation of seawater temperature in the vicinity of the outfall. This study aims to analyze the distribution patterns and temperature increases of seawater around the ocean outfall of Tanjung Jati B Power Plant Units 5 & 6. Numerical modeling was conducted using the Delft3D software, employing both the FLOW and WAVE modules to simulate the dispersion of thermal effluent and to assess temperature variations under different environmental conditions. The simulation results show that, during the west monsoon, the dispersion of thermal effluent predominantly extends toward the northeast, while during the east monsoon, the dispersion is mainly directed toward the west, northwest, and north. These findings underscore the significant influence of ocean currents and waves on the distribution of thermal effluent. Additionally, the maximum observed temperature increases of the thermal effluent reached 9°C, with the average area experiencing a temperature rise greater than 2°C measured at 932.16 m² during the west monsoon and 1,487.62 m² during the east monsoon, when comparing the 2024 dispersion pattern to the baseline seawater temperature in 2015. To mitigate the spread of thermal effluent, three alternative solutions are proposed: (1) extending the outfall structure, (2) evaluating and optimizing the design of the existing outfall. There are several potential approaches to minimize the dispersal of thermal wastewater, but further study is required to evaluate the effectiveness of these solutions.
Co-Authors Anita Kusuma Wardhani Daniel Mohammad Rosyid Fajar Lemanza Djazuli Madea Eka Silfiani Mukhtasor Santi Frestiqauli Wimala Lalitya Dhanistha Wisnu Wardhana Zahra Aisyiyah Rahayu