Modeling the Failure and Flow of Anisotropic Cracked Sea Ice

The main objective of this effort is to develop and numerically investigate a physically based model for describing and simulating the failure and flow of anisotropic cracked sea ice, and ultimately simulate oriented fractures on the geophysical scale in sea ice. With this objective in mind a concep...

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Bibliographic Details
Main Author: Hibler, III, W D
Other Authors: DARTMOUGH COLLEGE HANOVER NH THAYER SCHOOL OF ENGINEERING
Format: Text
Language:English
Published: 1998
Subjects:
Snow
Ice and Permafrost
Fluid Mechanics
Mechanics
*CRACKS
*FLOW
*PACK ICE
ACOUSTICS
AMBIENT NOISE
ANISOTROPY
ARCTIC REGIONS
DISSIPATION
FAILURE(MECHANICS)
FORECASTING
FRACTURE(MECHANICS)
MECHANICAL ENERGY
MODELS
NEAR FIELD
NUMERICAL METHODS AND PROCEDURES
ORIENTATION(DIRECTION)
RATIOS
SATELLITE IMAGERY
SIMULATION
STRESSES
THICKNESS
LEADS
ACOUSTIC MODELS
FLAWS
CONFINEMENT RATIO
Arctic
Ice
ice pack
permafrost
Sea ice
Online Access:http://www.dtic.mil/docs/citations/ADA534822
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA534822
Description
Summary:The main objective of this effort is to develop and numerically investigate a physically based model for describing and simulating the failure and flow of anisotropic cracked sea ice, and ultimately simulate oriented fractures on the geophysical scale in sea ice. With this objective in mind a conceptual model based on oriented lead ice imbedded in thicker ice has been formulated numerically with the yield criterion for both the thick and thin ice taken from laboratory observations together with an associated non normal flow rule prescribed in an energetically consistent manner. I then plan to utilize this model together with wind and water stress forcing on the ice pack to simulate oriented fractures in pack ice and compare these features with observations from satellite imagery. Secondary related objectives are (1) to develop a capability to simulate high frequency variability in pack ice as this should prove critical in the actual formation of opening leads as opposed to sliding fractures and (2) develop an energetically consistent ice dynamics model in curvilinear co-ordinates to be used both in forecast applications and for consistently determining positive definite mechanical energy dissipation for use in ambient noise acoustic models for the Arctic. See also ADM002252.

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