洮河流域水化学特征及其时空变化研究

Study on the hydro chemistry characteristics of the Taohe River basin and its temporal and spatial variation

以洮河流域河水为研究对象,通过对2018年每隔1月洮河干流及支流博拉河和广通河采样点的河水进行水化学研究,揭示了洮河流域河水的水化学组成,探讨了其水化学性质时空变化。结果表明:洮河流域水质偏碱性,干流上游pH值小于下游,并在枯水期都比丰水期为大;矿化度呈枯水期比丰水期小,河水属于中等矿化度水和适度硬水;总硬度、电导率呈枯水期比丰水期大;HCO_(3)^(-)、Ca^(2+)、Na^(+)、Cl^(-)、SO_(4)^(2-)、CO_(3)^(2-)含量呈枯水期比丰水期大;干流上游HCO_(3)^(-)、Ca^(2+)、CO_(3)^(2-)含量大于下游,干流上游Mg^(2+)、K^(+)、Na^(+)、Cl^(-)、SO_(4)^(2-)、MnO_(4)^(-)含量小于下游;支流HCO_(3)^(-)、Ca^(2+)、K^(+)、Na^(+)、Cl^(-)、SO_(4)^(2-)、MnO_(4)^(-)含量总体大于干流。

Taking the river water of Taohe River watershed as the research object,the hydrochemistry of the main stream of Taohe River and the tributary of Bora River and Guangtong River every other month in 2018 was studied,the hydrochemical composition of the river water in Tao River watershed was revealed,and the temporal and spatial variation of hydrochemical properties of Tao River watershed was discussed.The results showed that the water quality of Tao River watershed is alkaline,the pH value of the upper reaches of the main stream is lower than that of the lower reaches,and the pH value in the dry season is larger than that in the high water season.The salinity in dry water season is smaller than that in high water season,the river water belongs to medium salinity water and moderate hard water.The total hardness and electrical conductivity in dry water season are larger than those in high water season.The content of HCO_(3)^(-)、Ca^(2+)、Na^(+)、Cl^(-)、SO_(4)^(2-)、CO_(3)^(2-)are larger than those in high water season.The content of HCO_(3)^(-)、Ca^(2+)、CO_(3)^(2-)in the upper reaches of the main stream is higher than that in the downstream.The content of Mg^(2+)、K^(+)、Na^(+)、Cl^(-)、SO_(4)^(2-)、MnO_(4)^(-)in the upper reaches of the main stream is less than that in the downstream.The content of HCO_(3)^(-)、Ca^(2+)、K^(+)、Na^(+)、Cl^(-)、SO_(4)^(2-)、MnO_(4)^(-)in tributaries is generally higher than that in main streams.