A Calculation of the Acoustic Shear Wave Attenuation in Sea Ice.

• Main Authors: Hanse,J. G., Bunney,R. E.
• Other Authors: WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
• Format: Text
• Language: English
• Published: 1974
• Subjects: Snow; Ice and Permafrost; Acoustics; *Sea ice; *Acoustic waves; *Attenuation; Ice reporting; Thickness; Shear properties; Wave equations; Computer programs; Most Project-2; Ice; permafrost; Sea ice
• Online Access: http://www.dtic.mil/docs/citations/AD0786707; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0786707

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. (Author)