2019_programme: MODEL BENCHMARKING RESULTS FOR SHIP NOISE IN SHALLOW WATER

• Session: 20. Sonar performance modeling and verification. Applications to active and passive sonar
  Organiser(s): Colin Mathieu, Prior Mark, Heaney Kevin, Ellis Dale
• Lecture: MODEL BENCHMARKING RESULTS FOR SHIP NOISE IN SHALLOW WATER
  Paper ID: 860
  Author(s): Binnerts Bas, De Jong Christ, Karasalo Ilkka, Östberg Martin, Folegot Thomas, Clorennec Dominique, Ainslie Michael, Warner Graham, Wang Lian
  Presenter: Binnerts Bas
  Presentation type: oral
  Abstract: To support North Sea countries to comply with EU legislation, a framework for a fully operational joint monitoring programme for ambient noise in the North Sea is developed in the Interreg Joint Monitoring Programme for Ambient Noise North Sea (JOMOPANS). A key task in the project is to develop and demonstrate verified and validated modelling methods applicable for generating maps of ambient noise in the North Sea, with a focus on ships and wind as the dominant sources of sound.\n\nWithin the project a wide range of acoustic propagation model implementations from the JOMOPANS project partners are verified by means of a comparison of the output for two well-defined benchmark scenarios based on the modelling scenarios developed for the Weston Memorial Workshop. The model types considered are based on energy-flux integration, analytical and numerical mode solvers, parabolic equation range step integration, ray tracking and wavenumber integration. Recommendations on the use of these models are given and limitations are discussed. The acoustic metric considered is the depth-averaged sound pressure level in one-third octave (base 10) bands from 10 Hz to 20 kHz.\n\nThe results show that the majority of the tested models are in agreement for a range-independent shallow water environment, providing a reliable benchmark solution for the future verification of other propagation models. The observed agreement gives confidence that these models are correctly configured and able to provide numerically correct solutions. For a range-dependent environment however, a significant uncertainty remains. The solutions provided in this paper can be used as a reference to select the optimal compromise between reducing the computational complexity and increasing the model precision for the propagation of sound in shallow water.
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• Corresponding author: Mr Binnerts Bas
  Affiliation: TNO
  Country: Netherlands
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