Evidence for High Nonlinearity in Sandy Sediment Using an Air Gun Source

Abstract

An airgun source near the seafloor was used to initiate weakly nonlinear acoustic waves that propagated down into a sandy sediment. Below the airgun at an appropriate offset were two 12-element vertical arrays to monitor the waves' evolution from 10 cm above the seafloor to a depth of 1 meter in the seafloor. Analysis of the resulting waveforms gave values of log-pressure increase with time that are too large to be explained by linear theory, or even fluid-like nonlinearity. We investigate the possibility that nonlinearities inherent to granular media are responsible for the observations

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Document Details

Document Type
Technical Report
Publication Date
Jul 03, 2014
Accession Number
ADA608988

Entities

People

  • B. E. Mcdonald
  • Steve Stanic

Organizations

  • Naval Oceanographic Office

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Waves
  • Acoustics
  • Air Guns
  • Broadband
  • Coordinate Systems
  • Doppler Effect
  • Electrical Solitons
  • Engineering
  • Frequency
  • Military Research
  • Near Field
  • Plane Waves
  • Seabed
  • Slant Range
  • Spherical Waves
  • Wave Propagation
  • Waves

Readers

  • Acoustical Oceanography.
  • Materials Science and Engineering.
  • ballistics.