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Estimating marine sediment attenuation at low frequency with a vertical line array.

Yong-Min Jiang¹, N Ross Chapman, Kunde Yang

¹School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia, Canada. mini@uvic.ca

The Journal of the Acoustical Society of America

|April 10, 2009

Summary

This study introduces a new method for measuring compressional wave attenuation in marine sediments using short-range acoustic data. The findings reveal a linear frequency dependence and lower attenuation values than previously estimated.

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Area of Science:

Geophysics
Ocean Acoustics
Marine Sedimentology

Background:

Compressional wave attenuation in marine sediments is crucial for understanding acoustic propagation.
Previous methods for estimating sediment attenuation often involve complex inversions of acoustic field data.

Purpose of the Study:

To develop and present a novel method for determining compressional wave attenuation in marine sediments.
To extract sediment attenuation from short-range acoustic measurements.

Main Methods:

Utilized data from a vertical line array collected during the Shallow Water 2006 experiments.
Analyzed the signal strength ratio between sea bottom and sub-bottom reflections at frequencies from 1.75 to 3.15 kHz.
Estimated sediment attenuation based on these ratios.

Main Results:

A linear frequency dependence of compressional wave attenuation was identified.
The estimated sediment attenuation values were found to be lower than those obtained from previous acoustic field inversions in the same area.

Conclusions:

The presented method provides a viable approach for estimating marine sediment compressional wave attenuation.
The findings suggest that sediment attenuation may be lower than previously reported in this region, impacting acoustic models.