A time-domain model for seafloor scattering

Area of Science:

• Ocean acoustics
• Geophysics
• Signal processing

Background:

• Bottom scattering is crucial for underwater applications like target detection and sediment analysis.
• Existing models predict scattering strength but not ensemble-averaged mean-square pressure.
• A need exists for models that provide time-dependent scattered pressure information.

Purpose of the Study:

• To introduce a novel model for computing bottom scattering from a point source.
• To provide a full-wave solution for mean-square scattered pressure over time.
• To analyze backscatter time series for various seafloor types.

Main Methods:

• Development of a first-order perturbation theory model.
• Simulation of bottom scattering phenomena.
• Analysis of time-series data for backscattered pressure.

Main Results:

• A new model capable of calculating ensemble-averaged mean-square pressure over time is presented.
• The model provides a full-wave solution for bottom scattering.
• Demonstration of backscatter time series for diverse seafloor environments.

Conclusions:

• The introduced model offers a significant advancement for understanding and quantifying bottom scattering.
• This model enhances capabilities in sediment classification and geoacoustic inversion.
• The study discusses the model's strengths and limitations for practical applications.