Author(s): Dusan Zagar; Vanja Ramsak; Boris Petelin; Vlado Malacic
Linked Author(s): Dusan Zagar
Keywords: No Keywords
Abstract: A comparison of modelling results computed by two sediment transport models is presented. The PCFLOW3D is z-level based, while the ECOMSED uses s-layer coordinates. Consequently, their bottom velocities differ slightly. Bottom shear-stress and sediment resuspension were calculated separately for currents, waves and combined forcing conditions. Different typical wind conditions were taken into account. Although both models use the same approach (van Rijn, 1993) to simulate bottom shear-stress, resuspension and sediment transport, some discrepancies in the results were noticeable. The shear-stress results of the two models are in relatively good qualitative agreement, while the agreements of resuspension and suspended sediment concentrations within the water column are somewhat poorer. Furthermore, in small areas such as the Koper Bay the open boundary condition can have a significant impact on hydrodynamic parameters and consequently on sediment transport. One-way nesting with a larger computational domain would be necessary.