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Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
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Structure and stability of wave-theoretic kernels in the ocean.
Matthew A Dzieciuch1, Bruce D Cornuelle, Emmanuel K Skarsoulis
1Scripps Institution of Oceanography, University of California at San Diego, 9500 Gilman Drive, La Jolla, California 92093-0225.
The Journal of the Acoustical Society of America
|October 15, 2013
Summary
Travel-time sensitivity kernels (TSKs) effectively predict travel-time changes from sound-speed variations in ocean acoustics. Ray-based methods closely match full-wave results, validating inversions for large-scale ocean perturbations.
Area of Science:
- Ocean Acoustics
- Wave Theory
- Geophysical Inversion
Background:
- Travel-time sensitivity kernels (TSKs) model ray travel time responses to sound-speed variations.
- Understanding TSK spatial frequency content is crucial for interpreting ocean variability effects.
Purpose of the Study:
- To analyze the spatial frequency content of TSKs relative to ocean variability.
- To assess TSK stability in sensitive acoustic environments.
- To validate ray-based inversion methods against full-wave theory.
Main Methods:
- Wave-theoretic modeling to derive TSKs.
- Analysis of TSKs in physical and wavenumber spaces.
- Comparison of TSK predictions with ocean perturbation scales.
Main Results:
- Linear TSK models accurately predict travel-time changes.
- Ray-based methods perform comparably to full-wave kernels.
- Minimum vertical and horizontal scales of ocean perturbations are identified for travel-time impact.
- High correspondence between true and kernel-calculated travel times for large-scale perturbations.
Conclusions:
- TSKs are effective predictors of travel-time changes in ocean acoustics.
- Ray-based inversions are validated for large-scale ocean perturbation scenarios.
- Analysis in wavenumber space reveals key insights into travel-time response to ocean perturbations.
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