Numerical Modeling Efforts in Support of 3-D Environmental Variability and Acoustic Vector Field Studies
Abstract
The goals of this research included the study of the effects of three-dimensional (3-D) environmental variability on the flow of energy in the complex intensity field, and two-dimensional (2-D) scattering from evolving rough surfaces. In the former case, the fully 3-D forward problem was modeled in order to gain a deeper understanding of the impact of shallow water features, such as solitons, on the propagation of acoustic energy. In the latter, broadband rough surface scattering was computed by incorporating sophisticated models of an evolving one-dimensional (1-D) rough surface into the propagation model. In addition to characterizing the statistics of the scattered field, the evolving surface will allow direct analysis of the associated Doppler from rough surface scattering. OBJECTIVES The overall objective of this work was to study the three-dimensional response of the acoustic vector field in the presence of environmental variability, and the two-dimensional scattering response of the acoustic field due to an evolving rough surface. APPROACH For the 3-D propagation portion of this work, a previously developed technique for computing the acoustic vector field from a PE model,[1,2,3,5,6] was expanded to generate solutions in 3-D environments using a Cartesian coordinate system. The model was then employed at the Univ of Rhode Island to produce vector field data in a 3-D shallow water environment which incorporated perturbations due to shallow water non-linear internal wave structures.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 2010
- Accession Number
- ADA542049
Entities
People
- Kevin B. Smith
Organizations
- Naval Postgraduate School