Accession Number:

AD0784125

Title:

Fast Acoustic Fluctuations Caused by Fish,

Descriptive Note:

Corporate Author:

ADMIRALTY RESEARCH LAB TEDDINGTON (ENGLAND)

Personal Author(s):

Report Date:

1974-04-01

Pagination or Media Count:

16.0

Abstract:

Acoustic fluctuations of sound have been studied in the shallow waters of the Bristol Channel for a number of years and several different types have been identified. One of these, occurring in the summer daytime only, is a fluctuation of about 10 dB with a period of about 80 seconds. It has been observed at transmission frequencies between 312 Hz and 4.44 kHz but was most frequently recorded between 1 and 2 kHz. Because of its timing the phenomenon is attributed to fish, and, although the mechanism has not been positively identified, it is thought to involve fish clustering round the hydrophone. Author

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE