A numerical study of mixing and sediment transport caused by tidal in the Bontang waters

Freshwater and sediment that carried by the river then flow into the bay will cause sediment transport and mixing in the bay, in this case the Bontang Waters. The three-dimensional finite difference baroclinic model system (ECOMSED) is used to do numerical studies of the mixing and sediment transport process, this model was simulated for 40 days and verified using tidal data that taken using CTD. The values of sediment concentration ranged from 1×10^-6 to 1×10^-5 gr/cm³ on the surface, with sediment transport ranging between 0 - 12 (gr/m²)/s. Salinity on the surface is 0 - 35 ppm, and the temperature is 25 - 40 ° C. Mixing occurred at one river mouth with a salinity profile of 25 ppm on the surface and 32 ppm at the bottom, the sediment concentration value was in the range of 1.2×10^-5 gr/cm³ on the surface and decreased to 4×10^-6 gr/cm³ at the bottom.