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In June 2020, JASCO Applied Sciences undertook a sound source characterization (SSC) study of a geophysical seabed survey at the planned North Sea Energy Island site, Denmark. These surveys use multiple types of sound sources to image the seabed, including sparkers, parametric sonars, sub-bottom profilers (SBPs), side-scan sonars, and ultrashort baseline positioning systems (USBL). This is the first dedicated study aimed at characterizing each of the sources involved with a typical geophysics survey of this type. Individual passes were recorded at multiple distances out to 10 km for the sources alone and in combination with the same distribution and settings as they would usually be deployed for such a survey. The pass in the vessel’s typical configuration with all sources active was evaluated against the Southall et al. (Aquat Mamm 45(2):125–232, 2019) thresholds’ acoustic effect criteria for VHF cetaceans and the harbor porpoise behavioral threshold (Tougaard, Thresholds for behavioral responses to noise in marine mammals: background note to revision of guidelines from the Danish Energy Agency. Document Number 225. Technical report by Aarhus University, Department of Ecoscience for Danish Centre for Environment and Energy (DCE). 32p. https://dce2.au.dk/pub/TR225.pdf , 2021). The results showed that the PTS threshold of 173 dB re 1 μPa2s for the SEL is exceeded within less than 5 m from the source; the TTS threshold of 153 dB re 1 μPa2s for the SEL is exceeded within ~250 m from the source. The sound levels for all sources combined fell below a VHF-weighted sound pressure level 100 dB re 1 μPa Lp125ms at ~11 km from the source.

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Underwater Sound Signatures from Geophysics Survey Spread: Case Study from the North Sea Energy Island, Denmark

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  • 出版模式：

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  • 发表日期：

    2026年

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  • Federica Pace,
  • Calder Robinson,
  • Eric Lumsden,
  • Bruce Martin

摘要

In June 2020, JASCO Applied Sciences undertook a sound source characterization (SSC) study of a geophysical seabed survey at the planned North Sea Energy Island site, Denmark. These surveys use multiple types of sound sources to image the seabed, including sparkers, parametric sonars, sub-bottom profilers (SBPs), side-scan sonars, and ultrashort baseline positioning systems (USBL). This is the first dedicated study aimed at characterizing each of the sources involved with a typical geophysics survey of this type. Individual passes were recorded at multiple distances out to 10 km for the sources alone and in combination with the same distribution and settings as they would usually be deployed for such a survey. The pass in the vessel’s typical configuration with all sources active was evaluated against the Southall et al. (Aquat Mamm 45(2):125–232, 2019) thresholds’ acoustic effect criteria for VHF cetaceans and the harbor porpoise behavioral threshold (Tougaard, Thresholds for behavioral responses to noise in marine mammals: background note to revision of guidelines from the Danish Energy Agency. Document Number 225. Technical report by Aarhus University, Department of Ecoscience for Danish Centre for Environment and Energy (DCE). 32p. https://dce2.au.dk/pub/TR225.pdf , 2021). The results showed that the PTS threshold of 173 dB re 1 μPa2s for the SEL is exceeded within less than 5 m from the source; the TTS threshold of 153 dB re 1 μPa2s for the SEL is exceeded within ~250 m from the source. The sound levels for all sources combined fell below a VHF-weighted sound pressure level 100 dB re 1 μPa Lp125ms at ~11 km from the source.