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Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

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Published on: September 26, 2017

Physics-based characterization of soft marine sediments using vector sensors.

Oleg A Godin¹, Thomas J Deal², Hefeng Dong³

¹Department of Physics, Naval Postgraduate School, 833 Dyer Road, Monterey, California 93943-5216, USA.

The Journal of the Acoustical Society of America

|January 30, 2021

Summary

Researchers observed unique seismo-acoustic waves in the North Sea, revealing a two-layered seabed structure. This finding aids in understanding marine sediment properties through resonance analysis.

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Area of Science:

Geophysics
Ocean Acoustics
Marine Seismology

Background:

Seismo-acoustic wave fields are crucial for understanding seafloor properties.
Interface waves propagate along boundaries and carry information about sediment layers.
Previous studies have explored marine sediment characterization using wave phenomena.

Purpose of the Study:

To analyze low-frequency seismo-acoustic wave fields in the northern North Sea.
To investigate the characteristics of interface waves and their relation to seabed structure.
To develop a geoacoustic model that explains observed seismo-acoustic phenomena.

Main Methods:

Deployment of a linear horizontal array of seafloor vector sensors.
Analysis of power spectra to identify dominant frequencies and wave phenomena.
Examination of dispersion curves for interface waves to infer sediment properties.
Development and application of a geoacoustic model for inverse problem analysis.

Main Results:

Observation of a strong, narrow power spectrum peak around 38 Hz.
Identification of multi-mode horizontally and vertically polarized interface waves.
Phase speeds for interface waves ranged from 45 to 350 m/s.
Dispersion curves indicated a two-layered seabed with power-law shear speed dependence.
A geoacoustic model successfully reproduced key observational features.

Conclusions:

The observed power spectrum peak is interpreted as a seismo-acoustic resonance.
The findings suggest a complex, layered marine sediment structure.
The developed geoacoustic model provides a quantitative explanation for the observations.
Vector sensor data is critical for separating wave polarizations and evaluating sediment density.