Low-Frequency Acoustic Measurements in a Shallow-Water Area with a Rough Sea Surface

Abstract

Surface wave spectra have been measured in the North Sea simultaneously with acoustic investigations using explosive and CW sources. The goal of these experiments was to determine the influence of surface waves to low-frequency sound propagation. Vertical chains of hydrophones in different distances from the source are used to get the attenuation of the single modes. In order to resolve the influence of the surface, the experiments were carried out during different sea states. Doppler-spectra from first measurements with a 500 Hz source and one receiving hydrophone are presented.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1976
Accession Number
AD1114315

Entities

People

  • Juergen Siebert

Organizations

  • SACLANT ASW Research Centre
  • University of Hamburg

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Measurement
  • Acoustic Signals
  • Amplitude
  • Attenuation
  • Bandpass Filters
  • Buoys
  • Carrier Frequencies
  • Continuous Waves
  • Doppler Effect
  • Explosives
  • Filters
  • Frequency
  • Generators
  • Hydrophones
  • Measurement
  • Power Spectra
  • Shallow Water
  • Spectra
  • Surface Waves
  • Tape Recorders
  • Waves

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.