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Propagation in a waveguide with range-dependent seabed properties.

Charles W Holland¹

¹Applied Research Laboratory, The Pennsylvania State University, State College, Pennsylvania 16803, USA.

The Journal of the Acoustical Society of America

|November 30, 2010

Summary

This summary is machine-generated.

Acoustic propagation in the ocean is impacted by seabed variations. This study shows range-dependent seabed properties, particularly lossy sediments, increase acoustic propagation loss. The findings simplify predicting sound travel in complex underwater environments.

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Area of Science:

Ocean acoustics
Acoustic propagation modeling
Seabed geoacoustics

Background:

Ocean acoustic propagation is influenced by water column variability.
Seabed property variations significantly impact acoustic propagation but are less understood.
Existing models often simplify seabed properties, limiting accuracy.

Purpose of the Study:

To investigate the impact of spatial variability of seabed properties on acoustic propagation.
To derive a model for acoustic propagation over range-dependent seabeds.
To understand how sediment properties influence sound loss.

Main Methods:

Derived a new expression for acoustic propagation with range-dependent boundary properties.
Analyzed the dependence of incoherent propagation on seabed properties.
Utilized spatial probability distributions (pdfs) of sediment properties.

Main Results:

Incoherent range-dependent propagation depends on the geometric mean of the seabed reflection coefficient and arithmetic mean of cycle distance.
Propagation over range-dependent seabeds is primarily controlled by the lossiest sediments.
Range-dependence generally increases propagation loss due to lossy sediments or reflection coefficient nulls.

Conclusions:

The derived theory provides a simplified method for acoustic propagation modeling over variable seabeds.
Lossy sediment patches significantly increase overall acoustic propagation loss.
The model's findings are applicable to various waveguide systems beyond oceanic environments.