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A detailed study of sound reflections from a layered ocean bottom

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Abstract
The effect of layered sediments on sound reflection from the ocean bottom has been investigated theoretically and experimentally. Very detailed, systematic and computer-aided calculations of the reflection coefficient of a twolayer bottom are made, using well-known theory and varying the following parameters: (1) velocity and density contrasts; (2) layer thickness normalized with respect to wavelength; (3) absorption in the sediments (in db/wavelength); (4) shear wave velocity in the lower layer. Calculations are made both for a harmonic source and for a broadband source analysed within certain bands around the harmonic source frequency. A series of curves is obtained representing the two-layer effect for a range of parameters that encompasses typical ocean bottom values. It is shown that absorption in the upper layer is of great importance in sound reflection, especially beyond a critical angle, but that moderate shear wave velocities have little effect. An octave band analysis of experimentaldata -- using a broadband source -- tends to support this theoretical two-layer model.

URI
http://hdl.handle.net/20.500.12489/340

Report Number
TR-42

Collections
  • Technical Reports

Date
1965/05

Author(s)
Stangerup, Poul

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TR-42.pdf (23.94Mb)

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