Water resources and system of the River Yesil (ISHIM) under conditions of active anthropogenous transformation and climate changeстатья
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Дата последнего поиска статьи во внешних источниках: 28 февраля 2020 г.
Аннотация:This paper considers the features of the formation of the water resources and the system of the
transboundary River Yesil/Ishim (the left tributary of the River Irtysh), the sources and the formation zone of most of the flow of which are located in Kazakhstan, the transit zone and the inflow into the Irtysh river in Russia. Initial hydrological information was taken from published data for the years 1932-2017; and for the period 2008-2017 monitoring data gathered from gauging stations controlled by the RSE Kazgidromet of the Ministry of Energy of Kazakhstan.
Research confirms a pronounced irregularity in the flow of the Yesil River over the long-term, with
sequences of high and low-water years. In terms of the volume of annual flow, the difference between
these years can be as much as 200% to 300%. There is an uneven distribution of the runoff from the
River Yesil during the year, during which the river system is characterized by a pronounced short
flood and a very low low-water level.
The entire river is characterized by the almost simultaneous onset of flood; but from the data gathered downstream there is a temporary shift in the peak of the flood and a slight increase in its duration. At the same time, the analysis shows that over the past twenty-five years there has been a tendency for the flood to shift to earlier dates; a decrease in its duration; and an increase in runoff. In addition to the influence of climatic factors on the runoff and system of the River Yesil, qualitative and quantitative changes in the hydrological characteristics are shown, taking into account the regulatory activity of large reservoirs.
In general, an increase in the use of surface-water resources and unproductive losses exacerbate
the situation with their lack in low-water years, with the greatest shortage of water resources in the upper part of the Yesil’s basin. ISSN 1307-9867