Abstract
Three dimensional numerical model of current and temperature distribution in the estuary of Palu river was discussed in this article. The simulation was conducted using estuary coastal ocean model and sediment transport (ECOMSED) and geographical information system (GIS). The first simulation was conducted by assuming no discharge and the second simulation using combination of tidal and river discharge. The first simulation runs smoothly, where the results revealed that the tidal current velocity on the horizontal and vertical cross sections for one tidal cycle ranged from 0 m/s to 0.03 m/s. Whereas a run time error occurred during the second simulation due to the calculation of nonliniear advection term parameter in momentum equation. The error problem could be solved by imposing a low river discharge data into the model. The visual appearance of current circulation at the river mouth, calculated surface elevation, and temperature distribution on the horizontal and vertical cross sections revealed a good agreement with the primary and secondary data.
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