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Contributing to solving operational problems caused by harbour surges
Agitation by long waves often causes mooring lines in the Port of Geraldton to break, endangering both staff and vessels. The Geraldton Port Authority (GPA) – now known as Mid West Ports Authority – organised a workshop with national and international experts to find ways to address this problem. As part of the workshop, we provided a preliminary assessment of potential offshore mitigation schemes that could solve the long wave problems in the Port of Geraldton. As a result of the presentations and discussions, GPA decided not to proceed with the originally envisioned solution – a major extension of the west breakwater – because it was questionable whether sufficient benefits could be obtained, even with very large capital investments.
Supporting informed decision-making
The Geraldton Port Authority (GPA) wanted to reduce the cost and impact ofsurge delays on port operations. Mitigation of surge incidents is beneficial to portoperations as these incidents cause critical situations for the vessels themselvesand other vessels in the port as well as present a high risk to the safety of staffand potential damage to port structures.
Several studies have been carried out since the turn of the century in order tounderstand the origin of long waves and their interaction with the port itself aswell as moored vessels in the port.
Economic studies have also been conducted to assess the financial consequences of lost productivity in the port. GPA needed a firm basis for making decisions related to ways to mitigate the problems in the future.
Consequently, they invited experts from a number of experienced institutions, laboratories, and firms to participate in a workshop in order to arrive at an informed decision basis. The objective of the workshop was to create a foundation for new initiatives to solve the serious problems caused by long waves in the Port of Geraldton. The workshop topics included:
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:
Greater appreciation of the complexity of the Port of Geraldton’s long period wave climate
Realisation that the mitigation effort is likely to involve a combination of smaller initiatives rather than the delivery of a single solution
Identification of better potential solutions to the client’s challenges
Geraldton Port Authority (now known as Mid West Ports Authority)
MIKE 21 Boussinesq Wave (BW)
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