DETERMINATION AND ASSESSMENT OF THE HORYN RIVER BASIN RIVERS FEEDING TYPES CHANGES

Using the Horyn River Basin rivers as an example hydrograph separation algorithm was defined. The results of calculating different river feeding types values were given in paper. Also, analyzed their long-term dynamics. Ukrainian are characterized by snow, rain, and ground (soil underground) feeding. amount snow rain is determined taking into account characteristics atmospheric precipitation correlation with water runoff characteristics. In paper, amount, particular underground feeding, established using analytical (calculation) method. key principles for determination such graphic geometric components method application described. Examples computer software elementary figures areas considered. total separated hydrographs 480. Daily observation data from 8 hydrological stations (water discharges) 15 meteorological (air temperature, cover height) used research. Meteorological correlated to corresponding watersheds determining weight coefficient. GIS system tools – ArcGIS catchment construction further division separate each weather station influence (Thiessen polygons). resulting contours catchments refined on maps a scale 1: 50000. general, period 1961-2020, it that 31.6% 68.4%; share ranged 19.7% (Horyn Ozhenyn) 41.6% (Smilka Susly), average 11% Derazhne) 26.8% Susly). For changes assessed two representative periods 1961-1990 1991-2020. present (1991-2020) revealed decrease relative 8.4% 1.6%, respectively, increase soil 5.7% 4.3%, respectively.