Abstract
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.
Highlights
Lake Balkhash, a large water body of Kazakhstan, is of great ecological, economic and social significance
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
The main artery feeding Lake Balkhash is River Ile, which accounts for 80% of the runoff of all rivers flowing into Lake Balkhash
Summary
Lake Balkhash, a large water body of Kazakhstan, is of great ecological, economic and social significance. The process of increasing water content at Parshinskaya has been undertaken so that when the source of the siltation is Zhideli (at this point ZhideliKogaly), which is observed at the present time, the water content of the latter in the near future will not undergo significant changes (Report of scientific research 1990). Within a heavily regulated environment in the 1970–2009 years, Lake Balkhash received an average of 330 m3/s or 10.4 km3/year, and up-regulation of River Ile Kapshagai reservoir in 1953–1969 years received an average of 11.8 km3 As it can be seen, 1988–2005 observed a slight increase in runoff losses in the Ile delta in the wet years with maximum values in the years 1988 (18.1 km3), 1999 (22.5 km3) and 2002 (22.4 km3)
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