Accession Number : ADA312464

Title :   Summary of Technical Support for Seawolf Shock Test: Potential Impact on Marine-Mammal Hearing.

Descriptive Note : Final rept.,

Corporate Author : NAVAL SURFACE WARFARE CENTER INDIAN HEAD DIV MD

Personal Author(s) : Goertner, Jean A. ; Lehto, Delbert L.

PDF Url : ADA312464

Report Date : 15 MAY 1996

Pagination or Media Count : 86

Abstract : This report documents a study performed in support of the SSN 21 (Seawolf) shock-test program. The purpose was twofold: (1) to develop a more efficient method for calculating potential acoustic damage to marine-mammal herring from underwater explosions, and (2) to perform calculations specifically for use in preparing the Seawolf environmental impact statement. The most meaningful criterion for determining acoustic safe ranges would be one based on measurements of temporary threshold shift (TTS) in sea mammals exposed to underwater detonations. Because there are no existing data applicable to definition of such a criterion, an interim acoustic-energy limit, based on human in-air data, was developed for use in predicting the acoustic impact on the Seawolf detonations. Evidence indicates that this limit is very conservative. Therefore, until reliable measurements have been made of TTS that is directly attributable to exposure of marine mammals to sound produced by underwater explosions, this interim criterion should be used only for defining ranges for 'acoustic discomfort' or annoyance.

Descriptors :   *MAMMALS, *MARINE BIOLOGY, *UNDERWATER EXPLOSIONS, *SHOCK TESTS, *ENVIRONMENTAL IMPACT STATEMENTS, *AQUATIC ANIMALS, MEASUREMENT, DAMAGE, HUMANS, THRESHOLD EFFECTS, AIRBORNE, EFFICIENCY, RELIABILITY, SHIFTING, SAFETY, ACOUSTICS, DETONATIONS, ACOUSTIC RANGES.

Subject Categories : Biology
      Biological Oceanography
      Explosions
      Solid Wastes Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE