A Three-Dimensional Propagation Model-For3d

ihree-dimensional variability Occurs in the ocean volume and bottom on length scales that are important for acoustic propagation.There fore, there are situations when it is necessary to use 3-dimensional propagation models for accurate predictions.A recent propagation model (called 101731)) that has three dimensional capability is reviewed.A summary of the theoretical development, numerical solution procedures, and computer implementation of this model will be presented.An application of the model to propagation through the somd speed field from a mesoscale ocean prediction model will be discussed.It is important to describe both the capabilities of NR3!) (what it can do) and its limitations (what it cannot do).Its current limitations suggest some enhancements which can improve its capabilities and performance.These enhancements will be discussed along with a mmber of research topics in the area of three-dimensional propagation modeling.1 .