Bottom Reflection Loss in an Area in the Hatteras Abyssal Plain
Informal manuscript rept.
NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS
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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 00N and 71 deg 00 to 72 deg 00W. 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