Frequency dependence of geoacoustic properties in marine sediments
Abstract
APPROVED FOR PUBLIC RELEASE Understanding different properties of granular materials like sand and mud is a major open problem in physics. The study of these properties including geoacoustic properties (e.g. sound speed and attenuation) could be one of the hardest and most challenging researches in areas of physics. In continental shelves, most of the marine sediments range from sand to mud. While there have been numerous theoretical and experimental studies on the geoacoustic properties of marine sediments, the publishedresults show disparities. Particularly, estimated results from acoustic measurements in the transition frequency band, where sound speed and attenuation exhibit strong dispersion, are desirable to test the validity of geoacoustic models. This research utilizes dimension-reduced normal-mode based geoacoustic inversion approaches to estimate geoacoustic properties in marine sediments as a function of frequency. The normal mode characteristics are extracted using high resolution time-frequency representations of broadband acoustic data collected from ONR-sponsored Seabed Characterization Experiment (SBCEX) 2017 and 2021+.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 05, 2021
- Source ID
- N000142112424
Entities
People
- Lin Wan
Organizations
- Office of Naval Research
- United States Navy
- University of Delaware