Pemodelan Dinamika Arus Permukaan Laut Alur Pelayaran Barat Surabaya

The Surabaya West Shipping Channel (APBS) is one of Indonesia's busiest sea transportation corridors.These waters serve as the entry and exit points for ships that dock or depart from Surabaya and Gresik ports.The proximity of the APBS to the river mouth causes sedimentation and siltation, which must be addressed.As support data for channel maintenance, information on the speed and direction of sea surface currents is essential.The purpose of this study is to provide a description of the dynamics of sea surface currents using hydrodynamic modeling simulations, as well as a comparison of their characteristics across seasons and locations. The main data, namely bathymetry and tides, were used to build the hydrodynamic model, which was validated using ADCP data measurements. Model simulation was conducted between March 2020 and February 2021.The simulation results explain the differences in patterns between transition season 1 and the east season, as well as transition season 2 and the west season. In the transition season 1 and the east season with the transition season 2 and the west season. The average speed of sea surface currents in the transition season 1 and the east season is 0.182 m/s to 0.427 m/s with the current direction from the south and southeast to the north and northwest. Whereas in the transition season 2 and the west season the average current speed reaches 0.183 m/s to 0.521 m/s in a direction from north and northwest to south and southeast . Model validation is sufficient, with an RMSE of 0.037 and a MAPE of 28.7%.