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Ice jams are an integral part of the ice regime of the rivers of the Lena basin, and reach the greatest scales here [1]. Huge masses of ice moving downstream form hummock accumulations, clog the river bed and form ice dams. The nature of ice jams is determined by the conditions of flood formation. The height of the ice-jam water levels varies from year to year, significantly changing both the length of the rivers, and on the territory. Prolonged ice jams embracing large areas of the river during the spring breakup of ice in the Lena cause such natural hazards as flooding. Inhabited localities along the banks of the river are flooded. Catastrophic floods on northern rivers are one of the types of natural emergencies that pose a threat to the life of the population, as well as they cause great environmental and economic damage. Observation data at hydrometeorological stations and posts do not fully reflect the processes of jamming on rivers [2]. An analysis of the ice and the level regime of the middle reaches of the Lena River in the area of Lensk in this paper is conducted according to the perennial observations of Yakut management on hydrometeorology and monitoring of environment of Rosgidromet of Russia. The work was carried out in order to determine the values of a number of factors that lead to the critical levels at the sites of ice jams. Study area is the average flow of the river Lena.

On Ice Jam Formation in the Middle Lena