Some Perspectives and Recent Findings in Shallow Water Acoustics

Abstract

Shallow water acoustics has had in this country a long, though sporadic, history dating back to World War II, when the acoustic mine stimulated feverish activity in the subject. Yet, many aspects of this most difficult branch of underwater acoustics are not understood. Many of its complications are due to the temporal and spatial variability of the shallow water medium and its boundaries. For example, it was found that the transmission of shallow water sound will vary with direction and time at one location and to be different at apparently similar locations. Such variations make acoustic prediction difficult, and necessitate on-the-spot measurements at the place and time that data is required. To this end, the author had developed and tried out at a number of coastal locations an airborne method of data collection using sonobuoys, explosive sound signals, and simple, portable recording equipment. The transmission results have been summarized by loss contour charts showing the transmission environment around a receiving point in shallow water.

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Document Details

Document Type
Technical Report
Publication Date
Nov 08, 1971
Accession Number
AD0735108

Entities

People

  • Robert J. Urick

Organizations

  • Naval Ordnance Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Acoustic Equipment
  • Acoustic Measurement
  • Acoustic Signals
  • Acoustics
  • Airborne
  • Aircrafts
  • Classification
  • Environment
  • Explosives
  • Frequency Bands
  • Second World War
  • Shallow Water
  • Sonobuoys
  • Temperature Gradients
  • Transmission Loss
  • War
  • Water

Readers

  • Acoustical Oceanography.
  • Military History of the United States in the 20th Century.
  • Oceanography.