Abstract
Abstract : The long term goals of this research are to understand the statistics of acoustic fields in deep water ocean environments. At long ranges, broadband receptions consist of early ray-like arrivals and a finale that is best described in terms of the low order modes. This project mostly deals with experimental observations of the low mode signals. The observations are used to estimate the mode statistics and then compared against reduced physics models. The experimental observations rely on high quality acoustic, and environmental data. For that, this project uses observations from both the Long Range Ocean Acoustic Propagation EXperiment (LOAPEX) and the Philippine Sea EXperiment (PsiEX). This project consists of two parts. The first part estimates mode statistics from the Long Range Ocean Acoustic Propagation EXperiment (LOAPEX) conducted in 2004. LOAPEX provided a unique opportunity to measure low mode receptions at a series of ranges from 50 km to 3200 km. This project uses the data from LOAPEX to estimate range-dependent statistics such as mode energy, mode time coherence and cross-mode coherence. The second part produces accurate scattering predictions for the modes using the transport theory model. The predictions rely on in-situ estimates of the environmental variability. In order to characterize environmental variability this project uses measurements made during LOAPEX, and PsiEX.
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