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Hydrophones installed by the Comprehensive Test Ban Treaty Organization (CTBTO) around the Diego Garcia (DG) island pick up a variety of sounds. The observations come from different locations of the Indian Ocean. The DG island and the surrounding areas however scatter the incoming sounds. The bottom topography is complicated that the island is an atoll, overlooks the deep Chagos trench, and is surrounded by smaller islands. These features block, refract, and diffract the incoming sounds. The scattering renders analyzing the acoustic observations challenging, and makes localizing the sounds error-prone. This paper builds a three dimensional acoustic model using a combined coupled mode-parabolic equation approach. The model is used to study acoustic scattering for frequencies up to 100 Hz. Benchmark problems show that the model accurately predicts mode coupling, refraction, and diffraction effects. The paper then uses the model to interpret baleen whale sounds recorded by the CTBTO hydrophones.
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