Author(s): Lauri Arvola; Oleg Andrejev; Matti Lepparanta; Anniina Kiiltomaki
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Abstract: Formation of an ice cover in a lake has a drastic influence on the physics of the water body. For circulation dynamics, solid, landfast ice cover removes the influence of the wind, and the resulting circulation is thermohaline, forced by bottom heat flux and solar heating. The magnitude of circulation velocity is small, order of 1 cm/s, but it is stable and due to small lake dimensions resulting 3-dimensional transport of water is significant. As a part of a research programme ‘YMPANA’ to develop an automatic monitoring station for Lake Vanajavesi, southern Finland, an all-year circulation model is under development. The ice season is there a major challenge since very little such modeling research has been done earlier. Lake Vanajavesi is a medium-size (10 km) shallow lake with ice season lasting 5 months annually. For most of the winter the ice cover is a solid, stationary plate. The model is a threedimensional free surface model, and horizontal resolution of 250 m is employed. YMPANA programme provides proper calibration/validation data. This presentation shows the first results from the model study with emphasis on wintertime conditions.
Year: 2010