Vertical Directionality Measurements of Ambient Noise in the NE Pacific

Abstract

Vertical directionality measurements of the ambient noise field between 15 and 130 Hz are presented. These data were measured by a large aperture array deployed vertically from R/P FLIP at 35 deg. N, 126 deg. W in 4700 m of water. Spatial distribution is plotted as a function of frequency during specified times and as a function of time as specified frequencies during the onset of a local storm. Spectral levels of beams dominated by local noise sources display a threshold type behavior as wind speed increases. Spectral levels of beams dominated by distant shipping reveal the fine-scale structure of the ambient noise pedestal. Spatial distrubution is also plotted as a function of depth at specified frequencies and wind speeds, although due to the temporal variability of the noise, no significant differences were seen with depth. Vertical directionality, Ambient noise, Spatial distribution.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1989
Accession Number
ADA220007

Entities

People

  • R. J. Sotirin
  • William Hodgkiss

Organizations

  • Scripps Institution of Oceanography

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Ambient Noise
  • Classification
  • Contracts
  • Data Processing
  • Deep Depth
  • Depth
  • Directional
  • Frequency
  • High Latitudes
  • High Resolution
  • Identification
  • Measurement
  • Military Research
  • Navy
  • Sampling
  • Shallow Depth
  • Spatial Distribution

Readers

  • Acoustical Oceanography.
  • Acoustics.
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.