Transmission of 56-kc Sound in Shallow Water Over a Sand Bottom.

Abstract

This report presents the results of 46 transmission runs made in 15-fathom water over a sand bottom at 56 kc. The following preliminary results are offered. (1) on the average the transmission anomaly increased linearly with range regardless of the thermal structure. The average rate of increase of the anomaly (the attenuation coefficient) was 13.2 + or - 0.2 db per 1000 yards for 'MIKE' thermal structure and 15.7 + or - 0.1 db per 1000 yards for 'NAN' structure, (2) There was no significant difference between the attenuation coefficient measured by a hydrophone at a depth of 16 feet and by one at a depth of 50 feet; and (3) The average attenuation coefficient when the data were not grouped according to thermal structure was 14.7 + or - 0.6 db per 1000 yards.

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Document Details

Document Type
Technical Report
Publication Date
Jul 18, 1947
Accession Number
ADA048869

Entities

People

  • Myles J. Sheehy

Organizations

  • Navy Electronics Laboratory

Tags

Communities of Interest

  • C4I

DTIC Thesaurus Topics

  • Attenuation
  • Buildings And Structures
  • Calibration
  • Coefficients
  • Data Science
  • Deep Water
  • Hydrophones
  • Information Science
  • Least Squares Method
  • Measurement
  • Navy
  • Observation
  • Research Facilities
  • Shallow Water
  • Surface Temperature
  • Water

Readers

  • Acoustical Oceanography.
  • Acoustics.
  • Explosive Engineering.