Geoinformation analysis of the spatial location of settlements in Yakutia that are subject to flooding

The subject of the study is the structure and content of the GIS developed by the author "Settlements subject to flooding and flooding on the territory of the Republic of Sakha (Yakutia)". The object of the study is 128 flooded settlements included in the List of established flood zones on the territory of the Republic of Sakha (Yakutia), their analytical processing and cartographic interpretation. The sources for the creation of GIS were published sources, statistical data, data of departmental organizations, passports of socio-economic development of municipalities and archival documents. The author conducted various types of geoinformation analysis (analysis of the geography of settlements by river basins, the dynamics of the number of floods of settlements (since 1929-2017), the density of flooded settlements) in ArcGIS. It was revealed that most of the flooded and flooded settlements are located in the middle reaches of the Lena River and along its major tributaries – the Aldan, Amga, Olekma; in the northeastern part of Yakutia, flooded settlements are located mainly in the upper reaches of the Yana, Indigirka, Alazeya rivers, as well as in the lower and middle reaches of the river.Kolyma and their tributaries. It was found that in some localities the number of floods from 1930 to 2017 ranged from 30 to 40. It is shown that the highest density of settlements subject to flooding and flooding is observed in Central Yakutia in the places of the greatest concentration of the population of the republic. The developed GIS of settlements exposed to flooding can be used to make recommendations to ensure the protection of settlements from flooding and flooding.