Assessment of the spatio-temporal distribution of winter ten-day minimum runoff for the rivers of the Sevan Lake basin under the modern climate change
Abstract
The paper discusses the variability of winter minimum decadal water discharge for 12 gauge stations with the longest series of observations on the rivers flowing into the Sevan Lake.
Basing on the statistical analysis the norm of winter average decadal minimum discharge of the rivers was calculated, as well as the coefficients of variability (Cv) and irregularity (Cs). The probability curves of minimum water discharges of rivers were plotted, and the spatial and temporal variability of hydrological parameters under study was analyzed.
Correlations between water discharge values and the catchment areas were used to calculate the runoff parameters of the unexplored rivers. The map of the distribution of average winter decadal minimum runoff rate was compiled.
Studies show that the winter average decade minimum discharge of the rivers of the Lake Sevan basin has very uneven spatial distribution. The parameters under study vary on the average from 0,049 to 2,63 m3/sec, i. e. from 1,15 to 5,63 l/(sec km2) in the area. The highest minimum average decadal winter discharge of the rivers of the lake basin is 3,81 m3/sec, and the smallest is 0,006 m3/sec. Some rivers of the lake basin with relatively small catchment area and significant average balanced height have no runoff in winter because of through freezing resulting from the minor groundwater supply and low winter temperatures.
Temporal variability of water runoff is rather low for the rivers under study. The coefficient of variation (variability) of winter average decadal minimum discharges is 0,14–0,63. Most of the rivers in the lake basin have a tendency to increase winter average decadal minimum discharge due to the growing mean air temperature and increasing amount of precipitation during the winter period.
About the Authors
V. G. Margaryan
Yerevan State University
Russian Federation
Faculty of Geography and Geology, Department of Physical Geography and Hydrometeorology, Associate Professor, PhD. in Geography
Russian Federation
Faculty of Geography and Geology, Department of Physical Geography and Hydrometeorology, Associate Professor, PhD. in Geography
N. L. Frolova
Moscow State University
Russian Federation
Faculty of Geography, Department of Land Hydrology, Head of the Department, Professor, D.Sc. in Geography
Russian Federation
Faculty of Geography, Department of Land Hydrology, Head of the Department, Professor, D.Sc. in Geography
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For citations:
Margaryan V.G., Frolova N.L. Assessment of the spatio-temporal distribution of winter ten-day minimum runoff for the rivers of the Sevan Lake basin under the modern climate change. Lomonosov Geography Journal. 2021;(1):97-108. (In Russ.)
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