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

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.

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Document Details

Document Type
Technical Report
Publication Date
Aug 28, 2008
Accession Number
ADA498118

Entities

People

  • Jee Woong Choi
  • John A. Goff
  • Peter H. Dahl

Organizations

  • Hanyang University

Tags

Communities of Interest

  • Advanced Electronics
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Acoustic Properties
  • Acoustics
  • Attenuation
  • Bottom Bounce
  • Coefficients
  • Dispersions
  • Equations
  • Frequency
  • Geometry
  • Measurement
  • Physics
  • Physics Laboratories
  • Reflection
  • Reflectors
  • Seabed
  • Shallow Water
  • Three Dimensional

Readers

  • Acoustical Oceanography.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Materials Science and Engineering.