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The object of this research is the ice wedge casts and concomitant polygonal microrelief. The subject of this research is the delineation of ice wedge casts on the margin of southern exposure of the Lake Churapcha in Central Yakutia. It is a known fact that in permafrost areas, a pronounced polygonal microrelief is a sign of the presence of ice wedge casts. In geology, &amp;ldquo;delineation&amp;rdquo; is the outlining of contours and delimitation of boundaries of the deposits, minerals, and zones with different quality of mineral raw materials and mining-geological conditions, according to the data of geological study for rational development. Ice wedge casts and there is such deposit. The article summarizes the results of field engineering and geological surveys conducted in 1995 on the shore slope of southern exposure the lake that contains ice wedge casts. The author also examines the data from modern satellite images for detecting the activation of polygonal microrelief. The surveys of 1995 confirmed the widespread occurrence of ice wedge casts in the indicated district. According to geological section, the ice wedge casts were identified and delineated. The results of section of the bottom of lake-reservoir demonstrate that it is located in the &amp;ldquo;thawing bowl&amp;rdquo;. The presence of ice wedge casts is also indicated by a pronounced polygonal microrelief, which is confirmed by satellite images. As a result of climate warming, the upper limit of ice wedge casts may also change, approximately to 0.3 m, which depends on the air temperature, amount of precipitation and depth of seasonal thawing.	

arktika i antarktika

Method of delineation of in the area of Lake Churapcha in Central Yakutia: generalization of engineering and geological surveys of 1995 and study of modern polygonal microrelief