Dynamics of morphometric characteristics and valuation of siltation parameters of the Pigoli lake (The Republic of Tatarstan)

Abstract

The dynamics of morphometric characteristics and siltation parameters of the Pigoli lake located in Laishevsky district of the Republic of Tatarstan were considered. It’s shown that during 1968-2014 period morphometric parameters of the lake under influence of natural and anthropogenic factors were changed significantly: lake area decreased by 1.6 ha, an average depth – by 1.2 m, a volume - by 63000 m³. As the leading factors of the lake’s degradation, as a water body, the siltation and falling of water level due to lower volumes of surface runoff were considered. The thickness of sediments depending on the bottom marks of the lake is estimated at 0.5-1 m, in silted sinkholes – up to 2.5 m. The rate of sedimentation in the lake is 8-15 mm/year. Lake sediments are comprised of silts with a high content of organic matter and biogenic elements and can be recommended for use as a natural fertilizer.