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ANALYSIS OF VORTEX STRUCTURE IN A SHALLOW STRATIFIED LAKE
Abstract
In the summer period of 2018 satellite-tracked quasi-lagrangian drifter was launched in saline stratified Lake Shira (Republic of Khakassia, Russia). The analysis of obtained data was revealed a mesoscale vortex structure in the lake. At the same time, measurements of the current velocity were carried out at several points in the lake using an Acoustic Doppler Current Profiler (ADCP). The reliability of the data obtained using the quasi-lagrangian drifter is confirmed by a comparison with the data for the current velocity and for the direction and speed of the wind. The horizontal velocity was analyzed using complex empirical orthogonal functions. The hodograph of the first temporal coefficient shows the elliptical structure of the current. This effect may be due to the strong variability of wind on the lake during the summer period or to the vortex structure of wind stress. To clarify the origin and distribution of the mesoscale eddies (vortices) in Lake Shira, it is necessary to conduct a study with a large number of drifters.
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