Develop methods for deterministic and stochastic propagation calculations in complex shallow water environments, determine their capabilities and accuracy, and apply them for modeling data and understanding mechanisms. OBJECTIVES (A) Treat propagation from narrowband and broadband sources over elastic and poro-elastic sediments, and incorporate realistic bathymetric, topographic, and geoacoustic variations. (B) Analyze and interpret acoustic data, quantify effects of random environmental and experimental variability, and compare predictions of field statistics for intensity and coherence. APPROACH (A) Develop efficient and accurate parabolic equation (PE) techniques for applications involving heterogeneous sediments. Treat range dependence and sediment layering by coordinate rotation and single scattering methods. Benchmark results using data and specialized calculations.

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