Acoustic Scattering Kernels from Arctic Sea Ice.

A new algorithm for computing scattering kernels from Artic ice keels is described. The basic equations are adapted from Burke and Twersky (1966) but the algorithm does not involve approximations in the limits of low or high frequencies, and is therefore more accurate. Calculations over a range of f...

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Bibliographic Details
Main Author: Rubenstein,David
Other Authors: SCIENCE APPLICATIONS INTERNATIONAL CORP MCLEAN VA
Format: Text
Language:English
Published: 1986
Subjects:
Snow
Ice and Permafrost
Acoustics
*ACOUSTIC SCATTERING
*SEA ICE
ALGORITHMS
ANGLES
SURFACE ROUGHNESS
TOPOGRAPHY
KERNEL FUNCTIONS
INCOHERENT SCATTERING
UNDERWATER ACOUSTICS
TRANSMISSION LOSS
ARCTIC REGIONS
ACOUSTIC REFLECTION
RIDGES
GRAZING
ACOUSTIC CHANNELS
UNDERICE
Ice keels
Grazing angles
Scattering loss
Underice surfaces
Mathieu function
Arctic
Mathieu
Ice
permafrost
Sea ice
Online Access:http://www.dtic.mil/docs/citations/ADA174235
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA174235
Description
Summary:A new algorithm for computing scattering kernels from Artic ice keels is described. The basic equations are adapted from Burke and Twersky (1966) but the algorithm does not involve approximations in the limits of low or high frequencies, and is therefore more accurate. Calculations over a range of frequencies and grazing angles are presented. An important result is obtained. At high frequencies (greater than 200 hz) a significant component of the incoherent scattered energy is directed into shallow propagation angles (less than 15 degrees). This component must be accounted for in estimates of scattering loss.

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