3D Simulation Model of Tidal, Internal Mixing and Turbulent Kinetic Energy of Palu Bay

Sabhan, Alan Frendy Koropitan, Mulia Purba and Widodo Setiyo Pranowo

3D Simulation Model of Tidal, Internal Mixing and Turbulent Kinetic Energy of Palu Bay

2019

Sabhan, Alan Frendy Koropitan, Mulia Purba and Widodo Setiyo Pranowo

The tidal simulation models and internal mixing were constructed using finite volume method to simulate diurnal tide (K1) constituent and semidiurnal tide (M2) constituent, the mixing level model using General Ocean Turbulence Model (GOTM). Tidal elevation amplitude of the model K1 ranges from 19.27 to 19.31 cm, high tidal amplitude at the point near the mouth of the Palu River, low tidal amplitude at the open boundary of the model that leads to the Makassar Strait. The amplitude range by M2 tidal constituents is 55.55-55.75 cm, high tidal amplitude at the mouth of Palu Bay and the end of Palu Bay and the slope area. The tidal current of the K1 constituent strengthens at the open boundary of the model and weakens into Palu Bay, which then undergoes strengthening near the mouth of the Palu River which experiences extreme siltation, tidal currents strengthen in the mouth area of Palu Bay and the tip of Palu Bay is caused by the tidal constituent propagation M2 and also the slope of the area along the coast of Palu Bay. Bottom Ekman layer which is caused by K1 constituent can reach 11 meters while the M2 constituent reaches 7 meters. In the slope area, are also found the buoyancy frequency with the order of 10-5 which is at a depth of 75-150 m. Kinetic energy in Palu Bay stands at O (10-5-10-3) with high kinetic energy around rough topography in the order of 10-3 around the mouth of Palu Bay.

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