Accession Number : AD0786707

Title :   A Calculation of the Acoustic Shear Wave Attenuation in Sea Ice

Descriptive Note : Final rept.

Corporate Author : WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB

Personal Author(s) : Hanse, J G ; Bunney, R E

PDF Url : AD0786707

Report Date : Jul 1974

Pagination or Media Count : 46

Abstract : The attenuation of an acoustic disturbance propagating in a medium which is not perfectly elastic, homogeneous and isotropic can be considered to be the result of energy dissipation due to classical processes and scattering. The contribution of each of these mechanisms is dependent upon the frequency of the sound wave. In this report several mathematical models are discussed for a transverse wave moving in a visco-elastic material and a scattering theory is developed. The theory is applied to sea ice and attenuation as a function of frequency is predicted for this material.

Descriptors :   *ACOUSTIC WAVES, *ATTENUATION, *SEA ICE, COMPUTER PROGRAMS, ICE REPORTING, SHEAR PROPERTIES, THICKNESS, WAVE EQUATIONS

Subject Categories : Snow, Ice and Permafrost
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE