Abstract

The 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.

中文翻译：

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哈萨克斯坦锡尔河的水质变化特征及成因

摘要

像锡尔河（Syr Darya）沿河的三个站点一样，对主要离子的水质参数也进行了监测。使用Mann–Kendall检验，Sen的斜率估计量和线性回归在年度时间尺度上进行趋势分析。还研究了水质参数与河流流量的关系。统计方法在年度水质数据和主要离子中显示出正和负的趋势。通过统计学方法发现了硫酸根，钠钾离子和氯离子系列的显着趋势。在1940年之前，水的矿化度为0.4-0.6 g / L，水为碳酸氢钙-钙，并且硫酸根离子的体积增加。目前，矿化指数已提高了三倍。矿化度在上部为0.9–1.2 g / L，在上部为1.5–2。在河的下游为0 g / L。硫酸根离子和钠钾离子开始占主导地位，在河的下部观察到氯离子的数量超过了危险的数量。