Modeling the Failure and Flow of Anisotropic Cracked Sea Ice

• 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

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.