ИСТИНА

The Lena River delta is the biggest river delta in Russia and the fifth on the area in the world. It is the classical, multichannel delta of extension, unique on the ecological and economic importance. The delta is located in high polar latitudes, is washed by waters of the Arctic Laptev Sea and closes huge by the size and difficult on a structure watershed of the Lena River. As a result in the last decades the delta, its mode, a natural complex and estuarial ecosystems experience powerful influence from the changing water runoff of the Lena River and the hydrological mode of the Laptev Sea, regional climatic changes. Hydromorphologic consequence of this influence and hydroclimatic changes became: 1) increase in water runoff (7,2% in comparison with 1935-1976 years) and the warmth (5,7%) coming to the delta; 2) practically lack of changes in a weighed deposits yield; 3) change of their intra annual mode and in particular essential growth of water content of a winter lowwater (for 45%) under influence of both natural, and anthropogenous factors; 4) change of thermal and ice mode of water objects in the delta, in particular reduction of the period with the ice phenomena and freeze-up; 5) absolutely insignificant redistribution of water run-off between the main deltoid channel systems (with a speed <0,2%/10 years); 6) intensification of channel processes and dynamics of sea margin of delta. The collected data, including remote sensing of the earth covering the period from 1920th to 2012 allowed authors qualitatively and quantitatively to estimate these processes, to reveal existential regularities. Besides studying of flooding processes of deltoid flood plain depending on different water run-off values of the Lena River was one of the solved tasks. Researches are executed on a grant of the Russian scientific fund No. 14-37-00038.