Morphometric characteristics of lake bottoms of Lakes CHarskoe and Nuksenskoe (Volga upland, Russia) as the basis of their classification

The article presents the results of researching the morphometric and hydrological characteristics of Lakes CHarskoe and Nuksenskoe and suggests their genesis. Lakes have scientific (zoological, botanical, geological, geomorphological), water conservation significance, perform the environmental function of typical biocenoses of karst lakes. During the research, a bathymetric survey was carried out from the board of a boat, using an echo sounder, combined with a navigator. The results of field research were processed using the geoinformation program QGIS, digital models of the relief of lake basins were constructed, the main morphometric and hydrological characteristics were calculated. Based on the analysis of the morphometric characteristics of lakes and data on the landscape features of their surroundings, primarily on the geological structure (geostructural, lithological, etc.), conclusions are drawn about the karst origin of lake basins and the classification of lakes according to a set of criteria is carried out.