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The complexity in oceanography in Indian coastal environments requires detailed numerical modeling to provide significant physical insight into the ocean acoustic processes. An Acoustic Toolbox User Interface AcTUP, written in Matlab, which is suitable for a range of applications and with a variety of output data visualization tools is employed here. A fully range dependent model (RAMSGeo) based on Parabolic Equation has been implemented for a shallow water continental shelf region of 30 m depth on the east coast of Bay of Bengal. Measured sound speed profiles of the water column and seabed characteristics varying over range, is used here. Bottom halfspace parameters such as compressional wave speed, sediment density and sediment attenuation coefficient are chosen depending on the sediment type. A monopole sources of frequencies in the band 1 to 5kHz is considered just below the surface. The model is able to incorporate range dependent bathymetry, bottom interacting propagation, signal attenuation, travel time variation etc reasonably well. Transmission loss plots are presented showing features in propagation due to multipaths, surface bottom reflection and ducting. Parallel to the RAMSGeo model, a high-frequency propagation code (BELLHOP) based on Ray Tracing that can handle range-independent bathymetry is also used for predicting acoustic pressure field for the same site.
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