SPATIALANALYSIS OF CRYOGENIC FORMS OF THE RELIEF IN THE NORTHERN PART OF THE LENA-AMGA INTERFLUVE: the case of alaases in Ust-Aldansky District
Alaases are prominent representatives of cryogenic landforms, reﬂecting the history of the study area. They are the main feed for livestock in Central Yakutia. The purpose of the work was to identify the distribution pattern of alaas formations in the territory of Ust-Aldansky District and to make a spatial analysis of their distribution. In the study area, 4,401 alaases were digitized and spatial geographical analysis was carried out using GIS technologies. The results of the spatial analysis were reﬂected in the form of the Map of the distribution of alaases and bulgunnyakhs in Ust-Aldansky District, the Map of the distribution of alaases by administrative units, and the Map of the density of distribution of alaases and bulgunnyakhs. The quantitative characteristic of alases was given. It was revealed that the greatest alaas coefﬁcient was in the Muryunsky administrative unit, which is almost entirely located on the territory of the largest alaas Myuryu with an area of 58 square kilometres. Covering 87 % of the total area of its territory, most alaases in Ust-Aldansky District, are oriented to the north-west. The alaases, directed to the north, occupy only 2 % of the total area of the territory under consideration. When analyzing the distribution of alaases by administrative units, it turned out that they are concentrated in the Myuryunsky, Ospekhsky 1st and Khorinsky administrative units (74 %, 27 %, and 24.6 % of the total territory, respectively). The least (0.01 % and 0.75 %) concentration of alaases was found in Tyuliakh and Cheriktey administrative units, respectively. The analysis of the distribution density of alaases and bulgunnyakhs revealed that the most dense distribution of alaases is observed in Borogonsky and Legoysky administrative units. In Tyuliakh administrative unit, alaases are scarse. It is characteristic that most often bulgunnyakhs are found throughout the terrace in Borogonsky, Oltekhsky and Batagai administrative units.