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Characteristics and Causes of Changes in Water Quality in the Syr Darya River, Kazakhstan

Authors
  • Sanim Bissenbayeva,1, 2, 3, 4
  • Abuduwaili, Jilili1, 2, 3
  • Issanova, Gulnura1, 2, 4, 5
  • Samarkhanov, Kanat1, 2, 3
  • 1 State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China , Urumqi (China)
  • 2 Chinese Academy of Sciences Research Center for Ecology and Environment of Central Asia, Urumqi, 830011, China , Urumqi (China)
  • 3 University of Chinese Academy of Sciences, Beijing, 100049, China , Beijing (China)
  • 4 al-Farabi Kazakh National University, Almaty, 050060, Kazakhstan , Almaty (Kazakhstan)
  • 5 Uspanov Kazakh Research Institute of Soil Science and Agrochemistry, Almaty, 050060, Kazakhstan , Almaty (Kazakhstan)
Type
Published Article
Journal
Water Resources
Publisher
Pleiades Publishing
Publication Date
Sep 15, 2020
Volume
47
Issue
5
Pages
904–912
Identifiers
DOI: 10.1134/S009780782005019X
Source
Springer Nature
Keywords
License
Yellow

Abstract

AbstractThe water quality parameters, like major ions, have been monitored at three stations located along the Syr Darya River. The trend analysis was performed on annual timescales using the Mann–Kendall test, the Sen’s slope estimator and the linear regression. The relationships of the water quality parameters to river discharge were also investigated. The statistical methods showed both positive and negative trends in annual water quality data and major ions. Significant trends were detected by the statistical methods in sulphate, sodium-potassium ion and chloride ion series. Before 1940 the mineralization of water was 0.4–0.6 g/L and the water was bicarbonate-calcium, with an increased sulfate ions volume. Atthe moment, the mineralization index has become three times higher. The mineralization varies from 0.9–1.2 g/L in the upper and 1.5–2.0 g/L in the lower reaches of the river. The sulfate ion and sodium-potassium ions began to predominate, dangerously exceeded volumes of the chloride ion in the lower part of the river are observed.

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