Acoustic Characterization of the Sea-Air-Land Boundary
Abstract
This proposal expands the PI s recent work on the study of atmospheric sound propagation as it relates to the near-shore detection of Naval platforms. The ultimate aim of the overall research effort is an improved understanding of acoustic detectability given current atmospheric parameters, shore surface characteristics, and water surface conditions. Specifically, the PI has been involved in both modeling and measurement of acoustic propagation over distances ranging from hundreds of meters to several kilometers over ranges that include both water and shore components. The lack of focused literature devoted to near-shore atmospheric acoustics and theinteractions between water, air, and land at those boundaries speaks to the complexity of the problem. The complexity, however, does not diminish the importance of developing this knowledge base of high Naval relevance. The proposed work will add several dimensions of understanding to the overall near-shore acoustics problem with aprimarily empirical and experimental approach. Specifically, the work will continue to build the library of canonical long distance acoustic transmission loss measurement sets while establishing a new basic research effort focused primarily on shoaling waves. This new focus will be on several contributions of water wave dynamics to near-shore atmospheric acoustics. These include: (1) the effect of surface roughness directly on long distance transmission loss for airborne acoustic sources; (2) shoaling wave noise as a contributor to masking for onshore observers; and (3) shoaling waves as a transmission mechanism through the water-air boundary for underwater sources. The PI s existing measurement infrastructure is capable of high spatial density recordings of synchronized acoustic and meteorological observations. This proposal will allow development and validation of a new measurement protocol to characterize the hydrodynamic qualities of shoaling waves. Taken together, the overallsystem will provide the opportunity for improved understanding of the complicated physics governing sound at thesea-air-land boundaries.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Nov 08, 2024
- Source ID
- N000142412437
Entities
People
- Teresa Ryan
Organizations
- East Carolina University
- Office of Naval Research
- United States Navy