Ocean Acoustic Propagation and Coherence Studies
Abstract
Studies of fluctuating underwater sound propagation in complex 4-D variable environments, primarily shallow water, including an Arc""tic component, are proposed. The main approach will be to use theoretical and computational methods to describe propagation behavior"". Frequencies from 50 to 3000 Hz are emphasized. The focus will be on phenomena that are event-like or identifiable in nature, rathe""r than continuous phenomena that are better described by spectral orstochastic models, but the latter will be included when essenti"al. A further refinement of focus will be on phenomena that are spatially inhomogeneous or anisotropic. Scenarios to be investigated" will include those covered by experiments, and many results will be compared against field observations. Existing field data are fr""om Shelfbreak PRIMER, ASIAEX, SW06, NLIWI, and QPE. New data likely to arrive are from the Arctic (CANAPE, basin and shallow) and th""e Seabed Characterization study. Targets for study are the effects of internal tides, intermittent internal waves, intrusions, and f""ronts, including how these processes affect sound in regimes of three-dimensional seafloor interaction, including slopes and canyons". Studying theeffects of sound interacting with flow features and the seabed concurrently has been an important component of my work since my 1990~s time-varying mode-stripping studies of sound in internal waves and wave packets. Quantifying the effects of ocean" dynamical processes and seabed features on acoustic signal quality is one goal, and in turn quantifying how poor and/or unknown sig"nal quality (such as multipath and limited coherence) affects signal processing is another. Some ancillary research on internal-wave" predictability, internal-wave shapes, fronts, intrusions, and seabed morphology will be included because knowing details of these i""simportant for acoustics, and some acoustically relevant aspects of these features are not covered by other researchers.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 09, 2017
- Source ID
- N000141712624
Entities
People
- Timothy F Duda
Organizations
- Office of Naval Research
- United States Navy
- Woods Hole Oceanographic Institution