Elastic Parabolic Equation for Sound Propagation in Shallow Water Overlying an Elastic Bottom Using Complex Pade Approximation

概要

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The purpose of this paper is to describe an accurate computational method for underwater acoustic propagation problems in shallow water. Most of the available computational methods consider only longitudinal wave in a fluid model. These methods, however, may not be applied to all kinds of oceans because of the influence of shear wave in shallow water. In this paper, an elastic parabolic equation combined with the rotated Pade series for an accurate solution is derived. To confirm the validity of the proposed method, typical examples of sound propagation underwater are calculated in comparison with the conventional fluid PE method. Estimations of propagation pulse waveforms are performed under the condition that the propagation path is 5000m in an ocean of 300m depth. The result shows the difference of pulse waveforms between elastic and fluid PE models. It is also shown that consideration of the influence of shear wave in an elastic bottom is very important for an accurate calculation. [DOI: 10.1143/JJAP.41.3530]
社団法人応用物理学会の論文
2002-05-30