Ion migration process and influencing factors in inland river basin of arid area in China: a case study of Shiyang River Basin

Ma, Huiying; Zhu, Guofeng; Zhang, Yu; Sang, Liyuan; Wan, Qiaozhuo; Zhang, Zhiyuan; Xu, Yuanxiao; Qiu, Dongdong

Ion migration process and influencing factors in inland river basin of arid area in China: a case study of Shiyang River Basin

2021

A thorough understanding of the processes and driving factors of ion migration, dilution, and enrichment in arid inland river basins is the basis for implementing water resources management. In this study, we analyzed the water chemistry of streamflow, groundwater, and precipitation and the behavior of main elements in the Shiyang River Basin by means of the hydrochemical diagram and multivariate statistical analysis. The spatial variation of water chemistry was obvious, and the conversion between different water bodies was frequent. The ions migrated from the mountain area to the oasis and desert and accumulated near the terminal lake finally. There were obvious differences in hydrochemistry between surface water and groundwater. From the mountain to the basin, the hydrochemical type of surfer water has varied, and the hydrochemical type of groundwater has changed from Ca–Cl type to Na–Cl type. The hydrochemistry of the basin was controlled by silicate weathering. However, the influence of water–rock interaction on surface water and groundwater was different, and the surface water was more complex. Significantly, agricultural activities and sewage discharge had a negative impact on the water environment. Interbasin water transfer (IBWT) was a form of external ions input from outside the basin, which affected the chemical characteristics of surface water in the lower reaches to a certain extent. In arid areas, human impact on water chemistry needs to be paid attention. These results are helpful to strengthen the understanding of the relationship between different regions and different water bodies in the arid basin.

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