Sea Ice Elastic Moduli: Determination of Biot Parameters Using In-Field Velocity Measurements.

The elastic moduli of sea ice are determined from high frequency velocity measurements made on small samples extracted from the ice canopy. The experimental apparatus for determining the velocities is described and was designed to allow quick in-field measurement. The experimental procedure included...

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Bibliographic Details
Main Authors: Williams, K. L., Francois, R. E.
Other Authors: WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
Format: Text
Language:English
Published: 1991
Subjects:
Snow
Ice and Permafrost
Mechanics
*MODULUS OF ELASTICITY
*SEA ICE
HIGH FREQUENCY
PREDICTIONS
PHYSICAL PROPERTIES
HIGH VELOCITY
SALINITY
VELOCITY
SAMPLING
PRESSURE
ACOUSTICS
MEASUREMENT
ICE
PE63785N
WUDN250128
FISCAL YEAR 91
SBI1
ICE CANOPIES
Ice
permafrost
Sea ice
Online Access:http://www.dtic.mil/docs/citations/ADA239803
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA239803
Description
Summary:The elastic moduli of sea ice are determined from high frequency velocity measurements made on small samples extracted from the ice canopy. The experimental apparatus for determining the velocities is described and was designed to allow quick in-field measurement. The experimental procedure included measurement of the ice sample salinity and temperature and the results given here allow prediction of elastic moduli from knowledge of these more easily obtainable physical parameters. The elastic moduli determined are those appropriate for a specialized Biot model in which the ice is viewed as a closed pore isotropic material. With the Biot model put forth here, seven parameters are needed to predict acoustic velocities, all of which are easily interpreted physically and are given here in terms of their salinity and temperature dependences. PACS numbers: 43.20.Bi,43.20.Hg,43.30.Ma,43.35.Cg.

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