Ray Scattering from a Collection of Ice Keels.
Rept. for period ending May 87,
NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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An ice keel program that was described at the Spring 1985 meeting paper z7 is used to investigate the acoustic scattering properties of ice keels at high frequency. Keels are modeled as parabolas. Sample sets of keels are generated using published distributions of spacing and sizes O.I. Diachok, J. Acocust. Soc. Am. 59, 1110-1120 1976. A large number of rays are directed towards the keel set and the emerging rays are collected into angular bins. Reflections from and refraction through the ice are employed. Specular reflection coefficients computed in this manner are similar to published results ibid Diachok above 3 deg grazing angle. No significant specular reflection is found at lower grazing angles. The scattered rays tend to be directed predominantly into angles near the specular angle.
- Snow, Ice and Permafrost