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- W2024486054 abstract "A comparison between treating bottom attenuation perturbatively and exactly in a normal-mode expansion has been made for a representative shallow-water, low-frequency problem. The exact treatment introduces bottom attenuation through complex sound speed and thus complex depth functions, whereas the perturbative approach uses real valued depth functions and introduces mode attenuation only in the range function. Cases examined indicate transmission loss versus range calculations resulting from the two approaches disagree significantly near cutoff. Comparison with FFP calculations indicates the exact (complex depth function) solution is correct. When more than one mode is present, the other modes dominate the mode nearest cutoff; and although this mode is in error, it does not seriously affect the results. For those cases where the perturbative and exact solutions significantly differ, the error in the perturbative approach is mostly due to an incorrect normalizing factor; mode attenuation differences also account for part of the error. Results are discussed and a correction to the mode normalization factor derived from the perturbative solution is suggested." @default.
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- W2024486054 date "1982-04-01" @default.
- W2024486054 modified "2023-10-17" @default.
- W2024486054 title "Comparison between perturbative and exact treatment of bottom attenuation for shallow‐water, low‐frequency conditions" @default.
- W2024486054 doi "https://doi.org/10.1121/1.2019229" @default.
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