THE EFFECT OF WIND AND WAVES DRIVEN SURFACE DRIFT CURRENT TO PARTICLE TRAJECTORY OF OIL SPILL FROM OFFSHORE NORTH WEST JAVA (ONWJ) BLOCK ON JULY 2019

• Main Author: Amir, Alysha
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/51069
• Institution: Institut Teknologi Bandung

A large oil spill incident in the North West Java seas in July 2019 from the ONWJ (Offshore North West Java) block managed by PT. Pertamina Hulu Energi has been simulated using Slicktum software. The effect of wind and wave-generated surface drift currents is included as an additional component in the simulation generated by ocean currents and winds. Various current and wind inputs are used to see the sensitivity of the simulation to the quality of the data used. The ocean current data used are Mercator, BMKG-Inaflow1, and ITB Climatology data. Meanwhile, the wind data used are ECMWF 3 hourly, ECMWF 12 hourly, and GFS Climatology. The oil spill incident was simulated on the period of 12 - 31 July 2019, using three different scenarios. Simulation of scenario I is a trajectory model of ONWJ oil spill by only taking into account the influence of ocean currents, while scenario II simulation is added by wind influence through calculation of wind driven sea surface current, then the influence of current, wind, and wave generation forces is included in scenario III simulation, where current calculation Stokes by wave are calculated via JONSWAP parameterization. Verification is done by comparing the simulation results with the captured Sentinel 1A satellite imagery. The three scenario designs above show an increase in model accuracy of around 4,88% - 68,96% when calculating wind driven sea surface currents and Stokes currents. When compared to the Sentinel 1A satellite imagery, the simulation results using Mercator current data and 3 hourly ECMWF wind data are considered the best, with a model accuracy percentage of 79,53% and the oil distribution area reaching the area of Serang, Banten.