2023_programme: Evaluation of the coupling between environmental flucuations and acoustic propagation using canonical correlation analysis

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  • Session: 10. Observing the Oceans Acoustically
    Organiser(s): Bruce Howe and Kai Gemba
  • Lecture: Evaluation of the coupling between environmental flucuations and acoustic propagation using canonical correlation analysis
    Paper ID: 1984
    Author(s): L'Her Alexandre, Drémeau Angélique, Le Courtois Florent, Real Gaultier, Cristol Xavier, Stéphan Yann
    Presenter: L'Her Alexandre
    Abstract: Understanding the effects of environmental fluctuations on acoustic propagation can be a tedious process in complex fluctuating media, such as the underwater environment. Typically, numerical models can be used but tuning them can be time-consuming and error prone, as the range of fluctuations is wide and location-dependent.\n\nWith this in mind, we have chosen to use a statistical method to infer relationships between acoustic and temperature measurements. In particular, we explore the use of the Canonical Correlation Analysis (CCA). This is used to find relationships between two set of variables by finding linear combinations of each set, such that their Pearson correlation is maximum. \n\nIn this work, we use in-situ data from the INTIMATE96 campaign to investigate the applicability of CCA to a simple underwater acoustics case, as this campaign is an instance of shallow water propagation with tidal forcing.\nWe show how CCA can be used to infer physically-meaningful relationships between Empirical Orthogonal Functions of the temperature, its vertical gradient and the external forcing extracted from the measurements on one side, and acoustic propagation represented by the intensity of the first arrival and the travel time of the last arrivals on the other. \n\nIn particular CCA highlights the impact of external and internal tides on shallow water acoustic propagation. It is a first step in the use of CCA to help in the modeling of underwater acoustic propagation.
  • Corresponding author: Mr Alexandre L'Her
    Affiliation: ENSTA Bretagne, Thales DMS
    Country: France
    e-mail:

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