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A corrected effective density fluid model for gassy sediments.

Guangying Zheng1, Yiwang Huang1, Jian Hua1

  • 1Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China 276454158@qq.com, huangyiwang@Hrbeu.edu.cn, 595430535@qq.com, 13889459215@163.com, wangfei@hrbeu.edu.cn.

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This summary is machine-generated.

This study introduces a new fluid model for predicting sound in gassy sediments. The model accurately fits experimental data on sound attenuation, highlighting the role of bubble resonance in gassy sand.

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Area of Science:

  • Acoustics
  • Geophysics
  • Fluid Dynamics

Background:

  • Gassy sediments significantly affect acoustic wave propagation.
  • Accurate modeling of sound speed and attenuation is crucial for geophysical surveys.
  • Bubble resonance in gas-saturated media complicates acoustic predictions.

Purpose of the Study:

  • To develop a corrected effective density fluid model for gassy sediments.
  • To predict sound speed dispersion and attenuation coefficient.
  • To analyze the impact of bubble resonance on acoustic properties.

Main Methods:

  • Development of a corrected effective density fluid model.
  • Acoustic experimental measurements of attenuation coefficient (600-3000 Hz) in gassy unsaturated sand.
  • Modeling bubble size distribution using modified Gaussian functions.

Main Results:

  • The model predicts sound speed dispersion and attenuation coefficient in gassy sediments.
  • Experimental data revealed four peaks in attenuation spectra due to bubble resonance.
  • Fitted model attenuation coefficients showed good agreement with measured data.

Conclusions:

  • The corrected effective density fluid model is effective for gassy sediments.
  • Bubble size distribution modeling aids in understanding acoustic attenuation.
  • The study provides a framework for predicting acoustic properties in complex gassy sediment environments.