Accession Number : ADA254716


Title :   Nonreciprocity of Long-range Reverberation in Wedged Continental Shelf


Corporate Author : GEORGIA INST OF TECH ATLANTA SCHOOL OF MECHANICAL ENGINEERING


Personal Author(s) : Zhou, J X ; Zhang, X Z ; Rogers, P H ; Guan, D H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a254716.pdf


Report Date : 25 Aug 1992


Pagination or Media Count : 35


Abstract : First we talk about the background of current research on long-range reverberation in shallow water. The problem seems to fall into a 'dilemma'(endless loop) with no way out. Second, we introduced an averaged angular power spectrum method for long-range reverberation in the Pekeris model to show how we could bypass such 'dilemma'. Based on a resulted transformation relation between arbitrary angle dependence of bottom scattering and the range dependence of reverberation in shallow water, some experimental data on bottom scattering at small grazing angles and low frequencies will be given in the third part. In the last part, using the WKB approximation to the adiabatic normal mode theory, we extend the problem into wedged homogeneous shallow water. The result shows that the monostatic reverberation intensities, obtained at two terminals with different depths, would not be reciprocal.


Descriptors :   *SHALLOW WATER , *REVERBERATION , *UNDERWATER ACOUSTICS , DEPTH , CONTINENTAL SHELVES , LOW FREQUENCY , WAVE PACKETS , BOTTOM WATERS , SOLITONS , OCEAN MODELS , WAVE PROPAGATION , RESONANCE , ACOUSTIC SCATTERING


Subject Categories : Physical and Dynamic Oceanography
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE