Modeling of Mid-Frequency Reverberation in Very Shallow Water: A Green's Function Approach and Application to TREX2013 Data Analysis
Final rept. 1 Dec 2012-31 May 2015
WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
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The long-term goals of this research are to better understand and accurately model low- to mid-frequency reverberation in shallow water environment. Specific goals are to develop a model of reverberation for conditions 1-10 kHz, 20 m water depth, 10 km range corresponding to the ONR Target and Reverberation Experiment performed on the spring 2013 TREX2013, develop a code and conduct computer simulations with environmental inputs typical for the chosen location, and apply this model to analysis of available TREX2013 data. This report presents a Greens function modeling approach that allows fast estimations of volume reverberation in complex shallow water environments. A simplified first-order version of the approach is considered to show how far-field scattering solutions obtained for free space can be incorporated into reverberation in complicated bounded, range-dependent, and stratified environments. A higher-order modification of this approach is considered as well, using a MFSB Multiple Forward Single Backscatter approximation. Application to analysis of TREX2013 reverberation and tentative model-data comparisons are presented.
- Physical and Dynamic Oceanography
- Numerical Mathematics
- Theoretical Mathematics