Modeling and Forecasting Ocean Acoustic Conditions

Clicks: 13
ID: 308487
2017
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Abstract
Modeling acoustic conditions in an oceanic environment is a multiple-step process.The environmental conditions (features) in the area first must be measured or estimated; relevant features include seabed geometry, seabed composition, and four-dimensionally (4D) variable sound-speed and density variations related to evolving or wave motions.Often the dynamical wave modeling depends on first obtaining correct seabed and mean stratification conditions (for example, nonlinear internal wave modeling).Next, this information must be included in sound propagation modeling.A selection of the many methods and tools available for these tasks are described, with a focus on modeling sounds of 20 to 1000 Hz propagating through water-column features that are time-dependent and variable in three dimensions (i.e., 4D variable).An example of a 3D parabolic equation acoustic calculation shows how variability caused by evolving internal tidal waves affects sound propagation.Different propagation and scattering regimes are discussed, including the theoretically delineated weak scattering and strong scattering regimes, as well as the empirically examined regime found in nonlinear internal waves.The histories and the current state of our oceanographic knowledge (the input to acoustic modeling) and of our ability to effectively model complex acoustic conditions are discussed.Example acoustic simulation applications are also discussed; these are ocean acoustic tomography, coherence prediction, and signal-to-noise ratio prediction.Types of ocean models and acoustic models and how they are interfaced are also examined.These include deterministic, statistical analytic feature models.
Reference Key
openalex_W2755204846 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Timothy F. Duda
Journal journal of marine research
Year 2017
DOI
10.1357/002224017821836734
URL
https://doi.org/10.1357/002224017821836734
Keywords Keywords not found

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