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Modal group time spreads in weakly range-dependent deep ocean environments.

Ilya A Udovydchenkov¹, Michael G Brown

¹RSMAS/AMP, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida 33149, USA. iudovydchenkov@rsmas.miami.edu

The Journal of the Acoustical Society of America

|January 8, 2008

Summary

This study analyzes temporal spreading of acoustic signals in the ocean. It identifies three key factors contributing to signal dispersion, crucial for understanding underwater acoustic propagation.

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Area of Science:

Ocean acoustics
Wave propagation

Background:

Deep ocean environments exhibit complex acoustic propagation patterns.
Understanding modal group arrival times is critical for underwater acoustics.

Purpose of the Study:

To analyze the temporal spread of modal group arrivals in weakly range-dependent deep ocean environments.
To identify and quantify contributions to modal group time spreads.

Main Methods:

Asymptotic theory for wave propagation.
Full-wave numerical simulations of acoustic fields.
Comparison with exact mode theory.

Main Results:

Three main contributions to modal group time spreads identified: reciprocal bandwidth, deterministic dispersion, and scattering-induced spread.
Deterministic and scattering-induced spreads are proportional to the waveguide invariant (beta).
Asymptotic theory results show good agreement with numerical simulations.

Conclusions:

The study provides a theoretical framework for modal group time spreads in range-dependent environments.
Results are validated by numerical simulations and applicable to experiments like LOAPEX.