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Characterization of surficial mudflat sediments using shear wave elastography, core-logging, and microscopy

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Shear wave elastography (SWE) non-invasively mapped sediment heterogeneity, revealing stiff inclusions and variations in pore connectivity. This method offers insights into elastic wave properties in surficial sediments.

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Area of Science:

  • Geophysics
  • Acoustics
  • Sedimentology

Background:

  • Surficial sediments exhibit complex heterogeneity due to physical, biological, and chemical processes.
  • This heterogeneity significantly impacts elastic wave transmission and scattering.
  • Non-invasive techniques are needed to characterize these delicate surficial layers.

Purpose of the Study:

  • To apply shear wave elastography (SWE) for high-resolution imaging of shear speed heterogeneity in surficial sediments.
  • To correlate elastic properties with microstructural characteristics.
  • To investigate the relationship between sediment structure and wave propagation.

Main Methods:

  • Samples collected from New Hampshire mudflats.
  • Acoustic radiation force generated shear waves (50-200 Hz).
  • High-frame-rate ultrasound imaged shear wave propagation, creating 2D shear speed maps.
  • Microscopy techniques analyzed sediment microstructure.

Main Results:

  • SWE identified millimeter-scale stiff inclusions (up to 16 m/s) within a softer matrix (~2 m/s).
  • Spatial spectral analysis showed shear speed strengths between -42 and -38 dB re 1 m.
  • Positive shear speed gradients correlated with decreased pore connectivity and increased grain connectivity with depth.

Conclusions:

  • Shear wave elastography is effective for characterizing fine-scale heterogeneity in surficial sediments.
  • Sediment microstructure, particularly grain contacts and organo-clay content, influences elastic wave properties.
  • Findings support a grain shearing model for lubricated, compliant contacts.