English
УкраїнськаV.G. Margaryan. TEMPORAL CHANGES OF WINTER MINIMUM TEN-DAY RUNOFF OF SEVAN LAKE RIVERS BASIN
The purpose of this study is to analyze and assess the patterns of temporal changes in winter minimum ten-day flow rates in a number of long-term observations for rivers flowing into lake Sevan, as well as to analyze and evaluate patterns of temporal changes in winter air temperatures and precipitation within the lake Sevan basin. To carry out the work, the data of observations of 12 hydrological posts of the «Hydrometeorology and monitoring center» SNCO of the Ministry of Environment of the Republic of Armenia were used. All observed hydrological posts have a number of observations 40 years or more. The methods used in the work are: mathematical-statistical, extrapolation, interpolation, analysis, analogue and correlation. The regularities of changes in the 75% provision of the winter minimum ten-day runoff from the catchment areas are considered. The obtained dependencies can be used to obtain 75% provision of winter minimum ten-day flows of unexplored and little-studied rivers of the studied territory for a calendar year. A map of the distribution of the modul of the average minimum winter runoff for a ten-day with the lowest water content of 75% supply was constructed. It was found that there is a tendency for both the growth (58%) of the winter average ten-day minimum costs, and their decrease (42%). The rate of change of the winter average ten-day minimum flow rates is from -0,133 to +0,13 m3/s/10 years. On the Argichi river at Getashen point over the past 50 years there was an increase in the winter minimum ten-day runoff by 0.65 m3/s, and on the Lichk river at Lichk point – a decrease by 0,67 m3/s. Also considered the time course of average air temperatures and atmospheric precipitation for the winter period. It was found that there is a tendency towards an increase in air temperatures and atmospheric precipitation.
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