The study addresses the problems and the history of formation and functioning of one of the largest intracontinental estuaries in Kazakhstan-the Ili River waterway. Being a natural regulator of the ecological status of the region, the estuary of Ili River also influences the water regime of Lake Balkhash. This work studied the current state of hydrographic and hydrological networks in a selected area and the distribution of water flow entering the estuary through the various ducts. Using a water balance method, this study calculated the loss of water in the delta, estimated runoff to the peak of delta and the inflow of river water into Lake Balkhash for two periods: the natural-conditioned and disturbed. As a result of the work performed, it was possible to trace the dynamics of hydraulic parameters for a multiyear period.
The article contains analysis of the interrelation of circulation processes in the atmosphere with the change of runoff in the basins of rivers. The results of estimates which show the relationship of circulation processes in the atmosphere with the runoff of the zone of formation of one of southern regions of Kazakhstan are discussed. The typification of circulation processes by B. L. Dzerdzeyevskiy and previously made estimates of water resources in the basins of rivers of South Kazakhstan were assumed as a basis. Certain areas were considered in this work: the Ile-Balkash basin, basin of rivers Shu-Talas and basin of the Syrdariya river, each basin is considered separately, since the runoff varies by regions and by the value of fluctuations, it is not permanent, because of the various factors of runoff formation in individual basins of that region. The calculations performed have shown the possibility of using typification of elementary circulation mechanism (ECM) for further researches of climatic changes, including to determine the direction of change of river runoff in other river basins. The created database on annual values of each of the 41 types of ECM can be used in other studies as well.
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