STUDY OF QUANTITATIVE INDICATORS OF EVAPORATION FROM THE SURFACE OF WATER BODIES IN THE KUNDRYUCH’YA RIVER BASIN
Purpose: analysis of predicted water losses for evaporation from the water surface of the Sokolovskiy reservoir and ponds located on the river Kundryuch’ya, within the boundaries of the investigated site on the territory of the Russian Federation from Rebrikovka to the Sokolovskiy reservoir site and the annual distribution of evaporation depending on the percentage availability. An assessment of the possible impact of quantitative indicators of evaporation on the water supply of the river Kundryuch’ya and Sokolovskiy reservoir was made. Materials and methods: for calculating the amount of precipitation, evaporation and irretrievable losses from the water surface of reservoirs located in the basin of the river Kundryuch’ya upstream the Sokolovskiy reservoir section, the formulas for average long-term conditions, formulas for calculating the volumes of evaporation and nonrecoverable losses at P = 10, 25, 50 and 75 % of supply, as well as a contour map were used. The formulas used and the contour map were taken from the textbook by G. V. Zheleznyakov “Hydrology, Hydrometry and Flow Regulation”. Results: the values of monthly evaporation as a percentage of the annual amount, as well as layers and volumes of evaporation for the Sokolovskiy reservoir are given. It has been determined that the share of nonrecoverable losses from the Sokolovskiy reservoir is 0.87, from the rest of the water bodies is 0.13. The amount of nonrecoverable losses at different levels of availability range from 2.64 million m³ (10 %) to 1.85 million m³ (75 %). Conclusions. The research results served as a basis for making a decision on the liquidation or further operation of the existing water retaining structures. In view of the low values of nonrecoverable losses from water bodies, which have an insignificant effect on the quantitative indicators of runoff, the decision was made in favor of further operation.