Abstract
Parametric arrays are recently considered as directional sound sources for locating buried objects in marine sediments. To understand how nonlinear sound beams generated by parametric arrays propagate in marine sediments, a theoretical framework that accounts for the combined effects of diffraction, absorption, nonlinearity, and the physics of sediment is necessary. In this paper, the KZK equation is extended to augment a number of well-known sediment models. Nonlinear evolution of sound beams are computed and compared under different sediment models, namely, the fluid model, Buckingham's grain-shearing model, the Biot-Stoll model, and the effective density fluid model (EDFM). [This work was conducted in the Unmanned Technology Research Center (UTRC) sponsored by the Defense Acquisition Program Administration (DAPA) and the Agency for Defense Development (ADD) in the Republic of Korea.]
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