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Modelled Noise Sources

dBSea includes built-in noise source models that can generate source spectra based on physical parameters, rather than requiring measured or manually entered levels.

Vessel Noise (JOMOPANS)

dBSea implements the JOMOPANS-ECHO vessel noise model for predicting underwater noise from ships. This model calculates source levels based on vessel type, speed, and length.

Using the Vessel Noise Model

  1. On the Sources page, click Source Models
  2. Select the Vessels tab
  3. Enter the vessel parameters:
  4. Vessel type - Select from the available vessel categories
  5. Speed (knots) - Vessel speed through water
  6. Length (m) - Vessel length
  7. The predicted spectrum is displayed in the chart
  8. Click OK to apply the spectrum to the current source

Model Output

The model produces 1/3 octave band source levels in dB re 1 µPa m. These can be used directly as the source spectrum for propagation modeling.

Reference

The vessel noise model is based on:

JOMOPANS-ECHO: A model for predicting shipping noise. Joint Monitoring Programme for Ambient Noise in the North Sea.

For more information on the JOMOPANS project, see https://northsearegion.eu/jomopans/