ИСТИНА

The climatic changes observed in the last three decades have a significant impact on the water regime of the rivers in the European part of Russia. Previous studies have shown a significant transformation of the intra-annual flow distribution. The increase in runoff of the low flow period and the decrease in the spring months runoff by 20-40% relative to the mid-20th century. The main purpose of this work is to identify the mechanisms of redistribution of the flow based on the analysis of its genetic components. The methodology is based on graphoanalytical separation of the daily hydrograph. Within the framework of the GrWat algorithm using meteorological information, melt water, forming spring flood, thaw floods, rain floods and groundwater runoff detected. In addition, the dates of the critical water discharge, the duration of the hydrological seasons, the frequency of rain and thaw peaks are analyzed. The carried out calculations show that the decrease in the volumes of spring flood and its maximum discharge is to some extent observed practically on all the rivers of the European Russia. At the same time, there is an increase in the groundwater and occasional flood component. These processes are largely interrelated - the passage of rains or thaws leads to both the increase of river discharge in the channel network, and the replenishment of groundwater resources