In 2024, Defra commissioned a study to investigate the feasibility of introducing a piling noise limit in England and Wales. The study explored future piling scenarios for Round 4 and 5 offshore wind farm projects, selecting representative foundation types, hammer energies, and environmental conditions. Piling parameters modeled ranged from 5-m-diameter pin piles installed with a 3500-kJ-hammer energy up to 18-m-diameter monopiles installed with a 6500-kJ-hammer energy. Noise modeling suggested that, without mitigation, the noise limit imposed in other European countries, such as Germany and the Netherlands, would be exceeded for all modeled scenarios; injury ranges were predicted over several kilometers. Application of one or two noise abatement systems (NAS) could achieve considerable reductions in the range of auditory injury. A Defra-commissioned pilot study will increase our understanding of the efficacy of NAS, providing empirical data to demonstrate how received sound levels may be decreased using this technology and whether, in English and Welsh waters, a noise limit will be achievable. Importantly, it is unclear whether the ecological benefits of NAS outweigh the financial and environmental costs of using this technology. Further evidence must be sought to understand the implications of NAS and foster innovation.

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A Perspective on Piling Noise Abatement for Marine Mammals and What This Means for Future Offshore Wind Development in England and Wales

  • Tessa McGarry

摘要

In 2024, Defra commissioned a study to investigate the feasibility of introducing a piling noise limit in England and Wales. The study explored future piling scenarios for Round 4 and 5 offshore wind farm projects, selecting representative foundation types, hammer energies, and environmental conditions. Piling parameters modeled ranged from 5-m-diameter pin piles installed with a 3500-kJ-hammer energy up to 18-m-diameter monopiles installed with a 6500-kJ-hammer energy. Noise modeling suggested that, without mitigation, the noise limit imposed in other European countries, such as Germany and the Netherlands, would be exceeded for all modeled scenarios; injury ranges were predicted over several kilometers. Application of one or two noise abatement systems (NAS) could achieve considerable reductions in the range of auditory injury. A Defra-commissioned pilot study will increase our understanding of the efficacy of NAS, providing empirical data to demonstrate how received sound levels may be decreased using this technology and whether, in English and Welsh waters, a noise limit will be achievable. Importantly, it is unclear whether the ecological benefits of NAS outweigh the financial and environmental costs of using this technology. Further evidence must be sought to understand the implications of NAS and foster innovation.