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Bubble curtains for noise mitigation: One vs two.

Simon Beelen1,2, Marten Nijhof3, Christ de Jong3

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Summary
This summary is machine-generated.

Splitting airflow between two bubble curtains significantly enhances noise reduction during offshore pile driving. This dual-curtain approach improves acoustic performance, offering a more cost-effective solution for marine life protection and regulatory compliance.

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Area of Science:

  • Acoustics
  • Marine Engineering
  • Environmental Science

Background:

  • Bubble curtains are essential for mitigating noise pollution from offshore pile driving, protecting marine ecosystems.
  • Current bubble curtain operations face challenges with cost and meeting stringent noise regulations.

Purpose of the Study:

  • To investigate the acoustic effectiveness of splitting airflow into two separate bubble curtains compared to a single curtain.
  • To optimize compressed air usage for enhanced noise reduction.

Main Methods:

  • Experimental testing of dual and single bubble curtain configurations.
  • Numerical modeling to simulate bubble curtain performance.
  • Analysis of insertion loss and acoustic barrier effects.

Main Results:

  • Splitting airflow into two bubble curtains resulted in a measured insertion loss increase of up to 11 dB.
  • The dual-curtain system maintained reflective properties even with halved airflow rates.
  • Temporal variations in air distribution were identified as a key factor in performance variability.

Conclusions:

  • Operating two bubble curtains is a more effective method for noise reduction than a single curtain.
  • Accounting for manifold gaps in models improves accuracy for predicting bubble curtain performance.
  • This optimized approach offers a promising solution for environmental noise control in marine construction.