Multi-site validation of shipping noise maps using field measurements

Area of Science:

• Marine acoustics
• Environmental monitoring
• Computational oceanography

Background:

• Underwater radiated noise from shipping is a global issue impacting marine ecosystems.
• Acoustic modeling aids in mapping noise and evaluating mitigation strategies like speed reduction.
• Model predictions require validation with measurements for reliable application.

Purpose of the Study:

• To validate monthly and annual shipping noise maps for 2019.
• To assess the accuracy of Joint Monitoring of Ambient Noise in the North Sea (JOMOPANS) predictions.
• To ensure confidence in acoustic models for future management decisions.

Main Methods:

• Multi-site validation of acoustic model predictions against field measurements.
• Analysis of spectral, spatial, and temporal differences between modeled and measured noise.
• Identification of discrepancies attributed to model input uncertainties and unmodeled noise sources.

Main Results:

• Validation confirmed the utility of shipping noise maps for assessing noise pollution.
• Differences between predictions and measurements were identified and analyzed.
• Uncertainty in model inputs and additional anthropogenic noise sources were key factors in discrepancies.

Conclusions:

• Validated acoustic models are essential for effective management of shipping noise pollution.
• The study supports the use of JOMOPANS noise maps in marine environmental management.
• Accurate noise mapping is crucial for protecting marine life from anthropogenic impacts.