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http://dx.doi.org/10.7776/ASK.2009.28.3.208

Interpretation of Ground Wave Using Ray Method in Pekeris Waveguide  

Choi, Jee-Woong (한양대학교 과학기술대학 해양환경과학과 해양음향연구실)
Publication Information
The Journal of the Acoustical Society of Korea / v.28, no.3, 2009 , pp. 208-212 More about this Journal
Abstract
Ground wave is an acoustic wave propagating at a sediment sound speed in the case that sediment sound speed is constant with depth, which is explained by modal dispersion effects. In this paper, the ground wave in time domain is simulated using the ray-based approach, which is possible because the modal dispersion can be explained by the guiding of energy caused by reflection and refraction in the waveguide geometry. For a Pekeris waveguide, the ground wave can be interpreted as a sequence of head waves, called a head wave sequence [Choi and Dahl, J. Acoust. Soc. Am. 119, 3660-3668 (2006)]. The ground wave is simulated by convolution of the source signal with a channel impulse response of the head wave sequence, which is compared with simulated signals obtained via a Fourier synthesis of a complex parabolic equation (PE) field.
Keywords
Ground wave; Head wave; Modal dispersion; Ocean waveguide;
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