Accession Number:

ADA343728

Title:

Normal-Incidence, High-Frequency Bottom Penetration in the Soft Gassy Sediment of Eckernforde Bay, Germany

Descriptive Note:

Final rept.

Corporate Author:

NAVAL RESEARCH LAB STENNIS SPACE CENTER MS HIGH FREQUENCY ACOUSTICS SECTION

Personal Author(s):

Report Date:

1998-04-23

Pagination or Media Count:

51.0

Abstract:

Normal incidence, high frequency acoustic bottom penetration measurements were made in the gassy sediment of Eckernfoerde Bay, Germany. Measurements were made of water sediment insertion loss and signal level as a function of frequency and hydrophone depth. Results showed that hydrophones located in a gassy sublayer had signal levels that were higher than the signal level at a hydrophone located just below the sediment water interface. This increase in amplitude is attributed to reverberation from free methane bubbles excited near and above their resonant frequency.

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE