Long-term Variability of Ice Formation Dates on the Rivers of the Votkinsk Reservoir Catchment

V. G. Kalinin and V. V. Chichagov

Long-term variations of ice formation dates are studied using the long (more than 100 years) series of observations of ice regime on the rivers of the Votkinsk Reservoir catchment. Proposed is the methodological approach to assessing the long-term variability of these dates using both parametric and nonparametric statistical criteria.