Accession Number : ADA191757

Title :   Ray Scattering from a Collection of Ice Keels.

Descriptive Note : Rept. for period ending May 87,

Corporate Author : NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s) : Gordon, David F

PDF Url : ADA191757

Report Date : Nov 1987

Pagination or Media Count : 15

Abstract : 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.

Descriptors :   *ACOUSTIC SCATTERING, *SEA ICE, ACOUSTIC PROPERTIES, ANGLES, COEFFICIENTS, DISTRIBUTION, GRAZING, HIGH FREQUENCY, PARABOLAS, REFRACTION, SCATTERING, SPECULAR REFLECTION

Subject Categories : Acoustics
      Snow, Ice and Permafrost

Distribution Statement : APPROVED FOR PUBLIC RELEASE