Bottom Reflection Loss in an Area in the Hatteras Abyssal Plain

• Main Author: Winokur, Robert S.
• Other Authors: NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS
• Format: Text
• Language: English
• Published: 1965
• Subjects: Acoustics; *ACOUSTIC REFLECTION; *BOTTOM LOSS; SOUND TRANSMISSION; ACOUSTIC MEASUREMENT; UNDERWATER EXPLOSIONS; NORTH ATLANTIC OCEAN; ABYSSAL ZONES; ACOUSTIC DATA; UNDERWATER SOUND; MOST Project-2; Hatteras Abyssal Plain; Quadrangle; North Atlantic
• Online Access: http://www.dtic.mil/docs/citations/ADA071232; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA071232

Bottom reflection loss measurements were made along three tracks in a 1 degree quadrangle, designated Area C, extending from 33 deg 00' to 34 deg 00'N and 71 deg 00' to 72 deg 00'W. The area lies along the northwestern edge of the Hatteras Abyssal Plain. Explosive sound sources were used and, based on peak pressure, bottom reflection loss values were computed. Bottom loss at 1 and 3.5 kc for grazing angles between 20 and 60 degrees are reported. The results indicate that the bottom is frequency selective, which is suggested by the frequency crossings or inverse relationship between bottom loss and frequency exhibited by the data along one track. A uniform dependence of bottom loss on grazing angle is not observed. (Author)