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Granular Model Overview We constructed a sea ice model to investigate ice processes on Cook Inlet. The model is based on a discrete element technique (DEM). The model is 2-dimensional. The shape, thickness, position, orientation and velocity of each floe are stored in arrays. At each time
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1. A Sea Ice Model of Cook InletMark Hopkins, Walter Tucker, and Nate Mulherrin ERDC-CRREL Sponsored by Army Environmental Research Program
4. Advantages of a Granular Sea Ice Model A fundamental representation of the physical processes that govern sea ice dynamics at the level of individual floes.
Explicit simulation of oil platforms, ship and barge transit and mooring in a dynamic ice field.
10. Summary The initial model runs indicate that tidal forcing dominates the Cook Inlet ice dynamics. The next major step in this project is to incorporate wind forcing and thermodynamic forcing to accurately simulate ice growth and melt. Ships and platforms will also be placed in the simulation.
Model simulations will be initialized and verified with satellite imagery and charts of ice conditions in the Inlet. Model studies will be used to isolate the important processes governing Cook Inlet ice conditions with a goal of improving forecasting.
11. What Is Needed? Airborne or satellite photographs of the ice conditions in the inlet at 1 hour intervals (web cam?).
Understanding of how the dynamic conditions affect ice growth and melt (quicken or slow - how much?).
Ice thickness measurements. Is rafting or ridging important?
12. Sea Ice Animations are located at:
www.crrel.usace.army.mil/sid/hopkins_files/Seaice/Cook_inlet.htm