Arrival structure of long-range propagation excited by a finite amplitude source

We have studied the group and phase speed structure of long-range acoustic arrivals using linear acoustics. Here we present a preliminary study of some of these same paths but now we consider a higher amplitude source necessitating a nonlinear acoustic treatment. This research involves the eventual coupling of the Nonlinear Progressive Wave Equation (NPE) with an Adiabatic Normal Mode (ANM) Model. We use the ANM model (which has limited range-dependent capability) because our previous treatment for the linear problem was very revealing with respect to the physics of the arrival structure. KEY WORDS: acoustic arrival, nonlinear progressive wave equation, hydroacoustic OBJECTIVE The objective of this work is to derive new technologies, based on the physics of underwater sound propagation (both linear and nonlinear), for localizing underwater sound sources using data from single hydrophone stations that are part of the International Monitoring System. RESEARCH ACCOMPLISHE