Geoscience Reference
In-Depth Information
Drift ice dynamics is lateral scale dependent in two aspects. The resolution is limited by
the
floe size, and the forcing is limited by the size of the basin. These models have been
also used for large-scale simulations in the polar oceans, semi-enclosed mesoscale marine
basins such as the Baltic Sea and Gulf of St. Lawrence, and down to the scale of the
Niagara river in North America (Shen et al. 1993).
In short-term modelling, the time scale of ice cover evolution is 1 h
10 days. Because
the inertial time scale of drift ice is quite small (less than 1 h), the initial ice velocity can
be taken as zero. In large lakes the scale of the basin size is close to the length scale of ice
motion, and therefore a proper treatment of the boundary con
-
guration is critical.
plastic approach provided by the
AIDJEX model, which was produced in the extensive AIDJEX programme in the 1970s
(Coon 1980). The elastic part necessitates the tracking of the change from the reference
con
An alternative to viscous
plastic models is elastic
-
-
guration, and the basis seems to be preferable for lake ice covers, because often the
drift episodes are short events between static situations. However, applications of AIDJEX
models to lake ice are not known to the author.
The objectives of ice drift modelling are basic research of the dynamics of drift ice,
ice
land interaction, ice forecasting, and applications for ice engineering. Leads may open
-
Fig. 5.18 Maps showing the results of the mechanical model simulation that showed the day-today
variation in the compactness field for ice on Lake Peipsi between March 14 and 19, 2002 (Wang
et al. 2006)
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