Numerical modelling of wave disturbance in the extended harbour
We modelled wave disturbance for the existing harbour and two alternative layouts of the harbour extension using MIKE 21 Boussinesq Waves (BW). The modelling showed that the harbour extension will provide a reduction of the disturbance in the existing basin while the new basin will have a disturbance level comparable to the level in the current one. The modelling also showed that the entrance to the marina will have high levels of disturbance, since the wave heights were amplified due to the bathymetry.
In connection with the harbour disturbance modelling, we carried out ship motion modelling using our numerical model WAMSIM to determine the effect of the waves on moored ships. The models confirmed that the movements of ships at the new quays will be comparable to the movements at the existing quays.
Physical model tests of breakwater design
The breakwater design included densely placed stones in the armour layer of the breakwater. Using two-dimensional (2D) physical modelling, we optimised the design of the breakwater – with the client – by testing and confirming the benefits of densely packing the armour stones. As part of the design optimisation, we also tested a steeper slope of the breakwater, which proved stable and thus significantly reduced the amount of material needed for the breakwater.
We utilised three-dimensional (3D) physical modelling of the northern breakwater head at the entrance to the marina. Using this model, we localised an area that was extremely exposed due to special conditions in the bathymetry in front of the breakwater. We then tested an updated design in this area using larger armour stones. At the same time we were able to reduce the size of the armour stones in other parts of the breakwater, thus creating a safer design without using unnecessarily large stones in less exposed parts of the breakwater.