탄성 해저 지층을 고려한 파동방정식 기반 수중음향 모델링

초록

The rapid increase in anthropogenic underwater noise from offshore wind farms and shipping necessitates precise prediction techniques to evaluate environmental impacts. Particularly for low-frequency waves that penetrate deep into the seabed, the elastic behavior of geological layers influences sound propagation. However, conventional acoustic-approximation models are limited because they neglect shear wave generation and mode conversion. To address this problem, we implemented an underwater sound propagation model using a wave-equation-based time-domain finite-difference algorithm that fully incorporates the elastic properties of a complex seabed. The reliability of the model was verified against analytic solutions and a parabolic equation model that is considered a standard model. Simulations using a realistic benchmark geological model demonstrated the capability of this approach in effectively capturing complex interference patterns arising from elastic effects and multiple scattering, which are commonly overlooked by conventional methods. The results clarify the characteristics of sound propagation in complex marine environments and demonstrate the proposed model is a reliable tool for underwater noise impact analysis.

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