Abstract
A new approach to the Kritskiy-Menkel joint data analysis has been proposed to obtain the runoff summarized hydrological characteristics. The approach not only enables to increase the accuracy of the runoff distribution parameters in the conditions of the initial information lack but to take into account the hydrological regime stationary state disruptions due to climate changes. On the basis of the analysis of the many-year runoff series for the whole basin the runoff water content phase occurred due to the climate change is to be revealed and consequently the runoff data file is to be conventionally divided into two time periods corresponding to the water content phases. Zone-average parameters are to be calculated with Kritskiy-Menkel method. These parameters enable to obtain the calculated distribution curves in the conditions of the initial hydrological information lack. The calculated runoff values of the pre-set probability for the whole period of observations can be resulted from plotting of the joint distribution for the two periods according to the parameters obtained at the previous stage. The proposed algorithm is recommended to be used in case of the observed non-stationary state being an effect of the climatic change on a considerable territory.
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