摘要: LONG TERM GOALS: The overarching long term goal is to improve ocean physical state and acoustic state predictive capabilities. The shorter-term goal fitting the scope of this project is to create a broadly applicable and portable ... 展开 LONG TERM GOALS: The overarching long term goal is to improve ocean physical state and acoustic state predictive capabilities. The shorter-term goal fitting the scope of this project is to create a broadly applicable and portable continental shelf-area acoustic prediction capability that includes the effects of internal and surface gravity waves in addition to larger scale effects. OBJECTIVES: Specific project objectives are completed targeted studies of the relevant oceanographic processes in a few environmental regimes and of acoustic propagation and scattering processes in those regimes. An additional objective is the development of improved theoretical and computational tools for those physical processes identified to be important. Specific studies include improvements to underwater acoustics models, including time-stepped three-dimensional models (3.5D) and true four-dimensional models, and to couple them with ocean flow models. Ocean flow modeling will be improved by coupling nonhydrostatic physics (NHP) models with data-driven regional hydrostatic physics (HP) models. Composite (or hybrid physics) models that used reduced- physics nonhydrostatic wave models nested within HP regional models will be created and tested for acoustic prediction effectiveness. Surface-wave models and moving-medium acoustic models will be developed and tested. Stochastic acoustic prediction models will be developed, applied, and tested. Internal-wave physics will be studied in detail in laboratory and direct numerical simulation settings to constrain and validate the other computational efforts. 收起