Keyword: «hydrological processes»

The movement of running sand massifs is one of the crucial hydrological processes along the Lena River. It significantly affects the nature of the ice drift and spring floods. In this regard, the morphology of the Lena river bed in the Tabaga-Kangalassy section is very dynamic since the riverbed type here is weakly stable or unstable. It is composed of sandy soils and therefore subjected to severe deformation. Consequently, the processing and systematization of long-term data of hydrological observations by the Federal State Institution YaUGMS (Yakut Weather Control and Environmental Monitoring Service) can be used to assess the deformation of the river Lena bottom in the bridge crossing site and the section of two lines of the Hatassy-Pavlovsk underwater crossing of MGP.