Scour's threat to Europe's offshore wind farms is sinking in

Scour protection on this 20cm-diameter model of a Horns Rev 1 monopile foundation sank 7.7cm after an hour's testing at DTU

A question mark hangs over the long-term stability of Europe’s shallow-water turbines, after research linked to the Horns Rev 1 wind farm found that high-powered currents were causing the stone “armour” around the base of monopile foundations to collapse.

Exposed from behind this layer of shielding stone, turbines could potentially be dangerously destabilised by the effect of scour — the wave- and tide-driven sediment that can eat away at the seabed around fixed structures.

A team from the Technical University of Denmark ( DTU) carried out model tests designed to mirror the impact of offshore conditions on the three-layer cover of “scour protection” placed around the 80 turbines at Horns Rev 1, which, three years after installation, had sunk by as much as 1.5 metres.

Experiments in the current…

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