Dredging operations at Whanganui Port have been paused after a barge incident disrupted efforts to clear sediment from the harbor. The incident, which occurred on November 27, 2024, has prompted an investigation into its cause and temporary embargo on the barge.
Incident Overview: What Happened to the Barge?
The barge, which was filled with dredged material, became unbalanced while moving away from the wharf.
How the Barge Lost Stability
Port General Manager Geoff Evans provided details about the incident.
“As the barge moved, the load began to shift uncontrollably,” he said. “The barge tilted approximately 35 degrees to the vertical before resting on the riverbed.”
Thanks to the vessel’s proximity to shore, a bulldozer and rope were used to stabilize and level it. No injuries occurred, and the material was dumped back into the river to prevent further issues.
Why Was the Barge Unstable?
The dredging process currently relies on a barge equipped with a digger. Initial investigations suggest that the load instability could be attributed to papa (soft sedimentary rock).
The Role of Papa in Material Instability
“There is a belief that a higher concentration of papa increased water content in the digger bucket,” Evans said. “This likely made the material sloppier, causing instability.”
While this is the working theory, the exact cause is still under investigation. In the meantime, a temporary embargo has been placed on the barge to ensure safety.
Te Pūwaha Revitalization: The Bigger Picture
Despite the setback, the dredging is part of a broader initiative under the Whanganui District Council’s Te Pūwaha port revitalization project.
Upcoming Developments at Whanganui Port
The project is advancing in stages, and a major milestone is on the horizon. Around 1000 cubic meters of concrete will soon be poured to create a pavement hardstand and new water structures. These will support Q-West Boat Builders’ 380-tonne mobile boat hoist, marking significant progress in the port’s modernization.
Challenges in Maintaining Dredging Operations
Dredging at Whanganui Port is a critical task, especially with sediment buildup caused by a breach in the training wall enclosing the port basin.
Addressing Silt Accumulation
Port Chairman Mark Petersen highlighted the issue, noting that the hole in the wall allows silt to flow into the port from the Whanganui River.
Short-term dredging consents are under review by Horizons Regional Council, focusing on:
- Creating a navigable channel around the wharves.
- Establishing a long-term working port area.
The plans include closing the breach in the training wall to minimize future sediment issues.
Future of Dredging at Whanganui Port
Port General Manager Geoff Evans confirmed that a new dredging solution is being developed to meet long-term needs.
A More Robust Dredging Plan in Development
“This current dredging solution cannot fulfill all the port’s future requirements,” Evans said. “We are working on an alternative solution that will enhance efficiency and capability.”
Although details remain confidential, the announcement is expected soon. The new approach is anticipated to address not only current challenges but also ensure sustainable port operations.
Conclusion: Whanganui Port’s Commitment to Growth
The Te Pūwaha revitalization project underscores the Whanganui Port’s commitment to modernization and economic growth. Despite the recent barge incident, ongoing efforts to upgrade infrastructure and implement better dredging solutions remain on track.
As stakeholders work to overcome these challenges, Whanganui Port is positioning itself as a pivotal hub for the region’s maritime activities.