Specification of parameters of extreme summer precipitation for the design and operation of hydraulic structures in small catchments of the Central Chernozem (Black Earth) zone of Russia

Abstract

The main goal of the research is to clarify the parameters of extreme summer precipitation for the design and operation of hydraulic structures in small catchments. Having data on 12 meteorological stations of the Central Black Earth Zone of Russia, observations of phase-homogeneous values that were of genetically homogeneous origin were selected to assess the degree of variability of extreme precipitation. Statistical methods were used both in the presence and insufficiency of observational data. In the conditions of changing climatic factors and the lack of sufficiently accurate methods for determining the asymmetry coefficient, approaches to its determination using the method of year-points for the territory of the Central Black Earth Zone of the Russian Federation were proposed. Existing regulations, in which extreme precipitation is the basis for determining maximum discharges, lose their initial reliability and have shortcomings in the methods for determining hydrometeorological characteristics. Accordingly, the need to update the existing regulatory documents in connection with the trend of increasing the values of summer extreme precipitation relative to the region under consideration is substantiated.