Low Frequency, Broadband Measured Reverberation Levels at Intermediate to High Grazing Angles at Blake Escarpment
Abstract
Acoustic reverberation data were acquired at the Blake Escarpment using the acoustic array of Naval Research Laboratory's 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
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1993
- Accession Number
- ADA265636
Entities
People
- Ashok K. Kalra
- James A. Showalter
- James K. Fulford
Organizations
- United States Naval Research Laboratory