Analysis of broadband mid-frequency phase and amplitude variability related to fine-scale oceanography.
Abstract
We propose a continued investigation into the formation of caustics and triplications in short-range (1-5) km mid-frequency acoustic propagation. Observations collected during two experiments off the coast of Southern California in 2020-2021 conducted by various TFO- funded laboratories at Scripps Institution of Oceanography demonstrated that caustic and trip- lication formation was linked tothe shape and scale of changes in the vertical sound speed gradient. The proposed work would continue investigating the nature of these phenomena by trying to answer these two questions. First, how does small-scale ocean structure change the theoretical coherenceof sound propagation perturbed by internal-wave-driven sound-speed fluctuations? Second, can the short-time scale changes in the acoustic channel impulse re- sponse be described by a combination of slow internal wave advection and small-scale sound- speed structures? Both of these questions are key to understanding mid-frequency acousticfluctuations that occur on time scales of minutes to seconds which are relevant to the real-time processing of ocean acoustic receptions. Our proposal would use numerical simulations of the ocean environment and acoustic propagation as well as further analysis of TFO Southern California observations to answer the proposed questions.This abstract is publicly releasable.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Nov 09, 2024
- Source ID
- N000142412747
Entities
People
- Andrew J. Lucas
Organizations
- Office of Naval Research
- United States Navy
- University of California, San Diego