Abstract
Underwater acoustic measurements have been made of aircraft overflights of a shallow-water (15 m deep) environment off the coast of La Jolla, CA. The narrow-band harmonics generated by the engine and propeller penetrates the air–sea interface and excites the normal modes of the system with each mode having a characteristic Doppler shift. From a high-resolution FFT, the modal eigenvalues are determined from the modal frequencies. These eigenvalues are dependent on the acoustic properties of the sediment. For a Pekeris waveguide, the eigenvalues can be found from the transcendental dispersion relationship, providing a direct method for inverting for the density and sound speed in the sediment without the use of a complicated numerical model. The method is relatively straightforward and only requires a single sensor in the water column. The sensitivity of the inversion technique will be discussed in the context of simulated experiments as well as real data collected in the experiments performed north of Scripps pier, La Jolla. [Work supported by ONR and the ARCS Foundation.]
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