Accession Number:

ADA265636

Title:

Low Frequency, Broadband Measured Reverberation Levels at Intermediate to High Grazing Angles at Blake Escarpment

Descriptive Note:

Final rept.,

Corporate Author:

NAVAL RESEARCH LAB STENNIS SPACE CENTER MS

Report Date:

1993-04-01

Pagination or Media Count:

10.0

Abstract:

Acoustic reverberation data were acquired at the Blake Escarpment using the acoustic array of Naval Research Laboratorys Deep Towed Acoustic Geophysical System DTAGS. DTAGS is identical to the horizontally towed seismic streamers but has two collinear receiver arrays acoustic and geophysics, and in addition it can be towed close to the sea floor in water depths to 5000 m. Although DTAGS acquired the two sets of data acoustic and geophysics simultaneously, only the acoustic array data are analyzed for this reverberation study. The geophysics data are independently used for bottom and subsurface mapping and are not discussed further. The data is studied using the time- intercept ray parameter t-p technique to isolate the grazing angles and corresponding bottom features with the largest contributions. The contributions are separated into those associated with specular returns, and those associated with largely incoherent backscattering. These data are further analyzed to study the reverberation processes. Ocean acoustics, Reverberation

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE