Accession Number : ADA498118


Title :   Observations of the R Reflector and Sediment Interface Reflection at the Shallow Water '06 Central Site


Descriptive Note : Journal article


Corporate Author : HANYANG UNIV SEOUL (KOREA)


Personal Author(s) : Choi, Jee Woong ; Dahl, Peter H ; Goff, J A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a498118.pdf


Report Date : 28 Aug 2008


Pagination or Media Count : 8


Abstract : Acoustic bottom-interacting measurements from the Shallow Water '06 experiment (frequency range 1-20 kHz) are presented. These are co-located with coring and stratigraphic studies showing a thin (20 cm) higher sound speed layer overlaying a thicker (20 m) lower sound speed layer ending at a high-impedance reflector (R reflector). Reflections from the R reflector and analysis of the bottom reflection coefficient magnitude for the upper two sediment layers confirm both these features. Geoacoustic parameters are estimated, dispersion effects addressed, and forward modeling using the parabolic wave equation undertaken. The reflection coefficient measurements suggest a nonlinear attenuation law for the thin layer of sandy sediments.


Descriptors :   *SHALLOW WATER , *STRATIGRAPHY , *GEOACOUSTICS , *ACOUSTIC VELOCITY , LOW VELOCITY , NONLINEAR SYSTEMS , ATTENUATION , SEDIMENTS , LAW ENFORCEMENT , OCEAN BOTTOM , MARINE GEOLOGY , REFLECTION , WAVE EQUATIONS , MEASUREMENT , FORWARD AREAS


Subject Categories : Physical and Dynamic Oceanography
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE