Improving prediction of propagation, scattering, and reverberation in the Arctic with application to remote acoustic sensing of sea-ice
Abstract
The long term goal of this research is to develop a general physics-based approach tomodeling and data analysis of propagation, scattering, and reverberation in the complicatedArctic Ocean environments. One of main applications of such approach will be developingnew models and inversion algorithms to improve determination of sea-ice type and thicknessby analyzing echo time series obtained with the use of high-frequency upward-looking sonars(ULS). The new algorithms also will allow obtaining additional information on physicalproperties of ice, its heterogeneity and roughness. Also, these high frequency inversionalgorithms will be tested for applicability to moderate (mid-to-high) frequency systems.Another goal of this research is, using this physics-based approach, to develop a unifiedmodel of long-range propagation, scattering, and reverberation under sea ice at midfrequencies, and to apply this model to analysis of experimental data obtained duringICEX14. An initial analysis provides a qualitative explanation of these data and incorporateseffects of both near-forward and near-backward scattering from ice. This research proposes tostudy these effects rigorously, taking into account both roughness and volume heterogeneityof sea-ice as the two major scattering mechanisms in the under-ice acoustic waveguide. Thedeveloped models will allow quantitative interpretation of existing data, and will provide anecessary theoretical base for planning new experiments in complicated arctic environments.A final goal is to use the understanding developed to combine point ULS measurements andsynoptic measurements of long-range reverberation to give a wide area assessment of ice typedistribution.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 03, 2017
- Source ID
- N000141712196
Entities
People
- Anatoliy Ivakin
Organizations
- Office of Naval Research
- United States Navy
- University of Washington