Accession Number:

ADA128567

Title:

Study of Fish Bite on the AN/BQR-15 Towed Array.

Descriptive Note:

Technical rept. Feb-Nov 82,

Corporate Author:

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Report Date:

1982-11-01

Pagination or Media Count:

23.0

Abstract:

This report describes work done to study the reasons for fish bites on towed arrays. Three tasks were performed. A Pieces of boot from the two versions of the ANBQR-15 towed arrray were allowed to be bitten by sharks and the damage assessed. B The galvanic electric field produced by a submerged titanium array coupling was measured. C Pieces of two versions of BQR-15 array were towed through an area of the sea where sharks had been attracted in an unsuccessful attempt to provoke bites on the arrays. Results indicated that large sharks had no difficulty in penetrating the thin version of the BQR-15s boot. The galvanic field of a titanium coupling from the thin version of the array is sufficient to be detected by sharks at ranges of less than 15 cm and underwater photographs of the pieces of array showed that the titanium couplings of the thin array and the type of wrappings on the vibration isolation module VIM of the large array may be visually attractive to sharks. Author

Subject Categories:

  • Biological Oceanography
  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE