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INVESTIGATION OF THE POSSIBILITY OF COMPLETE MIXING MEROMICTIC RESERVOIR VIA A THREE-DIMENSIONAL NUMERICAL SIMULATION
Abstract
Reasons for complete mixing of meromictic reservoir are an interesting scientific problem. There are many salt lakes of meromictic type. Water column in such lakes is not mixed down to the bottom for at least one year. So two layers are formed: an upper layer saturated with oxygen and a bottom layer without oxygen but with hydrogen sulphide accumulate. There is a water layer with large density gradient between them, while in the upper and near-bottom layers density gradients are small. In case of mixing of the upper and the deep layers, an ecological catastrophe can occur. Salt stratified Lake Shira refers to meromictic type reservoirs. A few rare cases of its complete mixing are known. The last one occurred in winter 2014-2015. Deepening of the upper mixed layer depends on many factors. Investigation of the influence each of them separately is the task of mathematical modeling. A simple three-dimensional mathematical model based on Boussinesq and hydrostatics approximations makes it possible to analyze the effect of wind of different strength and direction on the variation of the salinity gradient both for the simplest basin of a rectangular shape and for a model reservoir with Shira Lake shoreline and a flat bottom. A series of numerical experiments have been carried out in a reservoir with real Lake Shira bathymetry.
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