Abstract
The paper presents the results of studies devoted to the assessment of long-term dynamics of the volume of transboundary runoff to the territory of Kazakhstan of mineral salts of the Zhaiyk River. On the basis of long-term material of the State monitoring of RSE «Kazhydromet», the features of transformation of water mineralization flow along the river are considered, also taking into account the influence of natural and anthropogenic factors. There is an information about the importance of water mineralization studies in the formation of surface water quality, as well as their runoff in the sanitary regime of inlet water bodies. The studies have shown great variability of mineral salt runoff in inter-annual and intra-annual periods depending on the fluctuation of water flow and the influence of a number of anthropogenic factors. The role of transboundary flow of the Zhaiyk river as the main factor of formation of water mineralization regime on the territory of Kazakhstan is shown, main factors determining the transformation of water mineralization along the watercourse are also given.