Abstract
Based on a methodology, an approach to the ecological and geographical classification of urban lakes is considered on the example of one of the largest cities in the North-East of Russia - Yakutsk. The survey area refers to the permafrost zone, which has a primary influence on the formation and development of lake depressions. The survey objects are based on the largest lakes in Yakutsk. A hierarchical scheme for the formation of lake systems in urbanized territories of the cryolithozone has been developed using the example of lake depressions in the city of Yakutsk. The research includes the following main classifications: morphogenetic, morphometric, hydrological, hydrophysical, hydrochemical and hydrobiological. Based on the above classifications, a unified classification matrix of permafrost lake systems has been compiled, containing descriptive and evaluative characteristics. The selected and most appropriate classifications are conventionally divided into physical-geographical and environmental. As a result of the analysis, the lakes belong to the oxbow-anthropogenic (Beloe, Sergelyakh), erosion-anthropogenic (Saysary) and oxbow-erosion (Khatyng-Yuryakh, Ytyk-Kyuel) type of depressions. Еssentially it is transformed by anthropogenic influences. Thus, as a result of ecological and geographical analysis, the lakes of Yakutsk are classified as moderately polluted (Ytyk-Kyuel, Sergelyakh) and polluted (Beloye, Khatyng-Yuryakh and Sergelyakh).
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