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- W2551921696 abstract "The vertical spectrum of low-frequency ambient noise in deep water contains significant contributions from distant shipping. Distant noise is concentrated at angles around broadside that are associated with the low order modes. Near-surface sources cannot excite the low modes directly. Dashen and Munk suggest three mechanisms for transferring energy from high modes to low modes: internal wave (IW) scattering, downslope conversion, and excitation at high latitudes where the sound channel intersects the surface. Dashen and Munk conclude that slope conversion is the most likely due to the weakness of IW scattering and the lack of shipping traffic at high latitudes. Commenting on their IW analysis, Dashen and Munk note that they are not totally convinced by their theoretical results and admit that IW scattering may have a significant effect. This talk compares the IW scattering and downslope conversion mechanisms for transferring surface source energy to the low modes. IW scattering is modeled using transport theory [Colosi and Morozov, JASA 2009] and compared to parabolic equation and coupled mode simulations. Results show that IW scattering from a large number of ships can produce vertical spectra comparable to those obtained through downslope conversion. [Work supported by ONR.]" @default.
- W2551921696 created "2016-11-30" @default.
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- W2551921696 date "2016-10-01" @default.
- W2551921696 modified "2023-10-17" @default.
- W2551921696 title "Comparison of scattering mechanisms for excitation of axial modes by surface sources" @default.
- W2551921696 doi "https://doi.org/10.1121/1.4970713" @default.
- W2551921696 hasPublicationYear "2016" @default.
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