Abstract
AbstractThe characteristics of sound propagation in shallow water are influenced by the bottom media because sound propagation is affected by acoustic boundary conditions of the water-sediment interface. In order to investigate the characteristics of sound propagating in shallow water, it is necessary to develop an accurate numerical method of sound propagation. The elastic finite difference time domain (FDTD) method is very accurate and is comparatively useful for range-dependent models in shallow water. There is a transition layer of porous media on the sea bottom in shallow water. Therefore, we investigated the characteristics of sound propagation in shallow water to clarify the fluctuation of the amplitude of waveform reflected from the sea bottom with a transition layer. As a result, we found that the amplitude of the sound pulse reflected from the sea bottom is influenced by the transition layer in shallow water when the transition layer thickness exceeds one wavelength.Key wordsNumerical analysis methodSound propagationShallow waterElastic finite difference time domain methodTransition layer
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