Representatives from DHI were among those invited to contribute and participate in the workshop. Using MIKE 21 Boussinesq Wave (BW), we analysed long wave generation and propagation into the Port of Geraldton.
DHI experts presented the results from the preliminary numerical analysis of mitigation measures at the outer fringe of the reef outside the port. These mitigation measures were designed to address long wave generation at the source, thereby reducing long wave energy entering the port.
We found that a breakwater structure at the fringe of the reef has the expected effect, but the costs of such measures would be prohibitive. A realignment of the access channel might have beneficial effects as well. That useful realignment, however, would lead to navigational difficulties for vessels transiting the channel.
Based on the presentations given at the workshop and during the open group discussions, GPA concluded that there was no single measure that could significantly improve the conditions in the harbour within the economic constraints of the originally envisioned breakwater solution.
A number of measures could potentially improve conditions in the port and, when combined, might provide acceptable conditions, including:
- modification of breakwaters
- alternative mooring systems
- improved management systems based on wave forecasting