Estimates of the coherent leakage of sound from an ocean surface duct
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For underwater sound transmission in a mixed-layer surface duct, the trapping of sound and the coherent leakage of some of this energy from the duct are well known phenomena. Models of sound transmission which include wave effects, such as modal models or Parabolic Equation models, include implicit determinations of the rates of coherent leakage. However for some applications it is useful or instructive to obtain direct analytic determinations of the leakage. Work carried out by the authors on the derivation of an approximate algorithm for the rate of coherent duct leakage is presented, along with comparisons with leakage rates determined by a wave-type model for several surface duct scenarios.
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Jones, A.; Duncan, Alec; Zhang, Z. (2015)The coherent leakage of a signal from a mixed-layer surface duct with no rough surface scattering is a subject which received considerable attention decades ago. As is well known, coherent leakage of sound from a surface ...
Jones, Adrian; Duncan, Alec; Zhang, Z. (2017)The sound speed variation with depth that defines a surface acoustic duct does not necessarily adhere to the uniform gradient of perfectly isothermal water. Prior consideration of the coherent leakage of sound from a ...
Jones, Adrian; Duncan, Alec; Bartel, D.; Zinoviev, A.; Maggi, A. (2011)The transmission of sonar signals in a surface ducted environment, or in a shallow ocean, is affected by reflection losses at the ocean surface, when wind action or swell causes the surface to be roughened. Under these ...