Prykhodkina V. Features of the maximum runoff of spring floods in the Southern Bug Basin and its calculated characteristics

The actual scientific and practical tasks of studying the spatio-temporal patterns and determining the calculated characteristics of the maximum runoff of spring floods in the Southern Bug River Basin was solved. The spatio-temporal tendencies of the maximum runoff of spring floods in the Southern Bug Basin are obtained. It shown that the maximum runoff of spring floods is characterized by cyclic and periodic fluctuations. The influence of solar activity, flares on the Sun, the Great Confrontations of Mars and Jupiter, as well as the appearance of comets near the Earth has been established on the water runoff of the Southern Bug River. A faceted classification of hydrographs is performed, which uses a multidimensional statistical approach and has a controlled number of classes. According to the characteristics of 102 hydrographs of spring flood, which were observed on the Southern Bug River near the village of Oleksandrivka for the period 1914-2015, 81 classes of theoretical hydrographs were determined. The long-term tendencies of the high runoff in the Southern Bug Basin according to the Indicators of Hydrologic Alteration (INA) method have been clarified. The determining characteristics of the maximum runoff of spring floods in the Southern Bug Basin have been determined according to observations. The spatial distribution of the average perennial depth of spring floods runoff, its coefficient of variation in the Southern Bug Basin using the principle of non-overlapping of river basins in GIS MapInfo using the triangulation method, which allows to get rid of subjective factors and automatically obtain values in any point map. Updated parameters of the reduction formula, namely К0, n, μ according to modern observation data. It revealed that the current parameters differ from those previously obtained. The difficulties of calculations due to the insufficient density of observations network are shown, which complicates the calculations and lowers their reliability.