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dc.contributor.authorColosi, John A.
dc.contributor.authorChandrayadula, Tarun K.
dc.contributor.authorVoronovich, Alexander G.
dc.contributor.authorOstashev, Vladimir E.
dc.dateOctober 2013
dc.date.accessioned2016-04-18T20:11:17Z
dc.date.available2016-04-18T20:11:17Z
dc.date.issued2013-10
dc.identifier.citationJ. Acoust. Soc. Am. Vol. 134 (4), Pt. 2 (October 2013), p. 3119-3133en_US
dc.identifier.urihttp://hdl.handle.net/10945/48419
dc.descriptionThe article of record as published may be found at http://dx.doi.org/10.1121/1.4818779en_US
dc.description.abstractSecond moments of mode amplitudes at fixed frequency as a function of separations in mode number, time, and horizontal distance are investigated using mode-based transport equations and Monte Carlo simulation. These second moments are used to study full-field acoustic coherence, including depth separations. Calculations for low-order modes between 50 and 250 Hz are presented using a deep-water Philippine Sea environment. Comparisons between Monte Carlo simulations and transport theory for time and depth coherence at frequencies of 75 and 250 Hz and for ranges up to 500 km show good agreement. The theory is used to examine the accuracy of the adiabatic and quadratic lag approximations, and the range and frequency scaling of coherence. It is found that while temporal coherence has a dominant adiabatic component, horizontal and vertical coherence have more equal contributions from coupling and adiabatic effects. In addition, the quadratic lag approximation is shown to be most accurate at higher frequencies and longer ranges. Last the range and frequency scalings are found to be sensitive to the functional form of the exponential decay of coherence with lag, but temporal and horizontal coherence show scalings that fall quite close to the well-known inverse frequency and inverse square root range laws.en_US
dc.description.sponsorshipOffice of Naval Research Ocean Acoustics Program Code (322)en_US
dc.format.extent15 p.en_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleCoupled mode transport theory for sound transmission through an ocean with random sound speed perturbations: Coherence in deep water environmentsen_US
dc.typeArticleen_US
dc.contributor.corporateNaval Postgraduate School (U.S.)en_US
dc.contributor.departmentOceanographyen_US
dc.description.funderOffice of Naval Research Ocean Acoustics Program Code (322)en_US


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