ЧАСОВА ДИНАМІКА, РОЗПОДІЛ ТА СУЧАСНІ ЗМІНИ ПАРАМЕТРІВ ТА ХАРАКТЕРИСТИК ВЕСНЯНОГО ВОДОПІЛЛЯ НА Р. ДЕСНА – М. ЧЕРНІГІВ

Abstract

The article analyzes the long-term variability of the main parameters and characteristics of spring irrigation on the Desna River – the city of Chernihiv. The main methods used are the methods of mathematical statistics, systematization, generalization and analysis of initial data and obtained results. To carry out the research, a bank of average daily water consumption of the Desna River – Chernihiv city for the observation period 1895–2020 (126 years) was created. The analysis of the initial information was carried out and the following series of random variables were formed over a multi-year period: a series of dates of the start of spring irrigation (in the number of days from January 1); range of maximum water consumption of spring irrigation (in m3/c); a number of dates of maxima (in the number of days from January 1); a number of dates of the end of spring watering (in the number of days from January 1); range of duration of spring irrigation (in number of days). The method of comparison is used to identify modern changes. To do this, all the above-mentioned series of parameters and characteristics of spring irrigation are divided into two periods equal in number of years – 1895-1957 (63 years) and 1958-2020 (63 years). The multi-year average values (norms), coefficients of variation and asymmetry of spring irrigation start dates, maximum water flows during spring irrigation and their onset dates, end dates and duration of spring irrigation on the Desna River – Chernihiv city were determined for all studied periods. Constructed histograms of relative frequencies in the form of partial intervals of all studied indicators and characteristics of the spring irrigation of the Desna River – the city of Chernihiv demonstrated the peculiarities of their distribution during the observation period 1895–2020.