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I have some problems to understand how to calculate the transmission loss at long distance, which model do I have to use?

I was looking into the energy flux model (Weston model), but I didn't understand at what range I should switch from "mode stripping" to "single mode".

I am working at low frequency (50Hz) and the range I am considering is around 400km.

Can anyone help me?

Thanks a lot!

Ciccio

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# A Underwater acoustics: transmission loss at long distance

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