Acoustic mode coupling by nonlinear internal wave packets in a shelfbreak front area


a service of the MBLWHOI Library | About WHOAS

Show simple item record

dc.contributor.author Duda, Timothy F.
dc.date.accessioned 2005-12-30T21:05:25Z
dc.date.available 2005-12-30T21:05:25Z
dc.date.issued 2004-01
dc.identifier.citation IEEE Journal of Oceanic Engineering 29 (2004): 118-125 en
dc.identifier.uri http://hdl.handle.net/1912/365
dc.description Author Posting. © IEEE, 2004. This article is posted here by permission of IEEE for personal use, not for redistribution. The definitive version was published in IEEE Journal of Oceanic Engineering 29 (2004): 118-125, doi:10.1109/JOE.2003.822975.
dc.description.abstract A computational case study of coupled-mode 400-Hz acoustic propagation over the distance 27 km on the continental shelf is presented. The mode coupling reported here is caused by lateral gradients of sound-speed within packets of nonlinear internal waves, often referred to as solitary wave packets. In a waveguide having unequal attenuation of modes, directional exchange of energy between low- and high-loss modes, via mode coupling, can become time dependent by the movement of waves and can cause temporally variable loss of acoustic energy into the bottom. Here, that bottom interaction effect is shown to be sensitive to stratification conditions, which determine waveguide properties and, in turn, determine modal attenuation coefficients. In particular, time-dependent energy loss due to the presence of moving internal wave packets is compared for waveguides with and without a frontal feature similar to that found at the shelfbreak south of New England. The mean and variability of acoustic energy level 27 km distant from a source are shown to be altered in a first order way by the presence of the frontal feature. The effects of the front are also shown to be functions of source depth. en
dc.description.sponsorship This work was supported by the Office of Naval Research Grants N00014-99-1-2074 and N00014-01-1-0772. en
dc.format.extent 611088 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher IEEE en
dc.relation.uri http://dx.doi.org/10.1109/JOE.2003.822975
dc.subject Continental shelf en
dc.subject Internal waves en
dc.subject Mode coupling en
dc.subject Shallow water en
dc.subject Shelfbreak front en
dc.subject Solitary waves en
dc.subject Sound propagation en
dc.title Acoustic mode coupling by nonlinear internal wave packets in a shelfbreak front area en
dc.type Article en
dc.identifier.doi 10.1109/JOE.2003.822975

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search WHOAS


My Account