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Spherical wave reflection in layered media with rough interfaces: Three-dimensional modeling.

Samuel Pinson1, Julio Cordioli1, Laurent Guillon2

  • 1Laboratório de Vibração e Acústica, Universidade Federal de Santa Catarina, Floriaónopolis, Brazil.

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Summary

Layered seafloor interface roughness impacts sound-speed profile measurements. A new 3D modeling approach efficiently calculates wave reflection over rough seafloor layers, reducing computational cost for sediment characterization.

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Area of Science:

  • Geophysics
  • Acoustics
  • Sedimentology

Background:

  • Layer interface roughness is a key factor in sound-speed profile measurement uncertainties.
  • Existing 3D modeling methods for rough interfaces are computationally expensive or limited to single interfaces.

Purpose of the Study:

  • To develop a computationally efficient 3D modeling method for wave reflection on rough interfaces in layered seafloor media.
  • To investigate the influence of interface roughness on acoustic wave propagation in sediments.

Main Methods:

  • A novel approach models wave reflection as a sum of integrals over each interface.
  • Key approximations include the tangent-plane and Born approximations, and a flat-interface approximation for transmitted waves.
  • This method integrates over layer interfaces for efficient computation.

Main Results:

  • The proposed method provides a reasonable computation cost for 3D modeling of wave reflection on rough layered seafloor.
  • Demonstrates the feasibility of modeling complex seafloor interface geometries.

Conclusions:

  • The developed integral-based method offers an efficient alternative for 3D acoustic modeling of layered media with rough interfaces.
  • This approach can improve the accuracy of sound-speed profile measurements in sediment characterization.