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Dutch test barrier to prevent ships from colliding

In a study triggered by an incident in the North Sea of ​​the Netherlands January when a drifting bulk carrier struck an offshore wind farmThis week, the Dutch Maritime Institute MARIN worked with industry partners to test three innovative barriers aimed at avoiding collisions between ships and wind turbines.

The drifting bulk carrier Julietta D first collided with a tanker before colliding with the transformer platform and turbine foundation of the Hollandse Kust Zuid wind farm currently under construction.

“Collisions with installed wind turbines carry the real risk of the turbine tipping over the ship, putting serious danger to the crew, passengers, the ship itself, and the environment,” Marin said.

Increased risk

According to a study conducted by the Maritime Research Institute Netherlands (MARIN) for the Dutch government, more than 2500 wind turbines will be built in the North Sea between now and 2030, and the risk of turbine collisions with ships is about 1.5 to annually. 2.5 times.

“If you think about it, about 80 vessels drift in the North Sea each year. Accidents can be avoided in a variety of ways. For example, a drifting vessel can be anchored. But this is a crew of vessels. Active intervention by personnel is often required, or emergency towing vessels (ETVs) can be deployed to safely tow drifting vessels, upgrading vessel surveillance and some form of operation. It can include ship traffic management, “says MARIN.

“Accidents involving Giulietta D represent the real danger posed by the drifting of vessels,” says MARIN’s road safety team leader. Yvonne Cordenhof. “Even with current resources such as ETV, it is difficult to avoid this type of incident.”

“Sea guardrail”

At a workshop on February 23, MARIN and a group of 20 experts from the broader maritime sector developed a trio of innovative concepts on maritime guardrails between shipping lanes and wind farms.

“Our mission includes both marine safety and sustainable use of the ocean,” explains MARIN’s General Director. Basbuchner.. “It means not just paying attention to danger, but looking for solutions to prevent accidents. We were keen to do this in collaboration with offshore sector experts. We chose the Open Innovation Project. It is the work title “Sea Guardrail” because many wind power plants are planned near the traffic separation plan: Sea Highway.

Video captions: The first concept is a series of surface buoys secured with drag anchors. The concept was tested in the offshore basin to see if the barrier could deflect a scale model comparable to the Giulietta D in stormy conditions.

The first concept involves a series of surface buoys secured by drag anchors. The second concept consists of a smart suspension net between fixed poles and the third concept is an anchored underwater hook line designed to catch the anchor of a drifting vessel. MARIN will create scale models of all three solutions in the offshore basin on March 17th and 18th, and will test to see if the barrier can deflect a scale model comparable to Giulietta D in stormy conditions. I ran it.

The second concept consists of a smart suspension net between fixed poles © MARIN

Representatives of the following Dutch maritime and offshore organizations were involved in this project: Bluewater Energy Services, Mooreast, Vuyk Engineering, Heerema Marine Contractors, Boskalis, GustoMSC, KRVE (Rotterdam Boatmen), Pinkster Marine Hydrodynamics, Huisman Equipment, Orca Offshore, and SBM offshore.

Promising results

The first results are promising, according to Marin.

“”We have established that all three concepts can intercept vessels, “said William Otto, MARIN’s offshore project manager. ‘The buoy ring drag anchors dissipate the drift energy evenly, leaving the ship floating across the waves. The fixed underwater hook directs the ship to the waves, reducing roll.

“That is, the ship stays in place while exposed to relatively low forces. The smart suspension net was initially too drooping, but with a few tweaks it can also work. We’re done. In the coming months, continue to evaluate the various strengths and weaknesses of these systems. “

The various concepts and all test results are shared as an open innovation project that enables further development of the most promising concepts. The initiative also spread international interest, Marin said.

The third is an anchored underwater hook line designed to catch the anchors of drifting vessels © MARIN

https://www.oedigital.com/news/495150-dutch-test-barriers-to-prevent-ships-from-hitting-wind-turbines Dutch test barrier to prevent ships from colliding

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