ИСТИНА

Evaluation of occasional flood runoff is a complex and multifactorial problem. The main difficulty is extremely hard selection of each flood wave. Given the climate variability and the general trend of a climate warming, a growing number of flood waves on the rivers of European Russia is observed. Therefore, the main goal of the study is the development of approaches for automatic hydrograph separation within all hydrological seasons.To analyzes the role of peak-flow component in the annual runoff special soft – GrWat was created. The code was written both on Fortran and R-studio software. Algorithm based on the hydrograph separation schemes, carried out by B. Kudelin. Given the characteristics of each particular river, the program, firstly, correctly separates the groundwater and surface component. Then, according to the dates the spring flood and peak flow are calculated. The mathematical description of the individual characteristics of river flow variations set the 12 calibrated parameters. For the separation of rainwater after the main melt water wave the block of the recession curves have been incorporated into the program. For the analysis of the peaks in the summer-autumn and winter period spatial distribution of the air temperature and precipitation (Daily NOAA-CIRES 20th Century Reanalysis V2) was involved. It helps to determine flow-effective precipitation and to derive individual peaks and flood periods.