[Hydrogen and Oxygen Isotopic Characteristics and Influencing Factors of "Three Waters" in Shandian River Basin]

Li-Na Yang; De-Bin Jia; Rui-Zhong Gao; Wen-Xu Su; Fang-Yuan Lu; Yu-Sheng Hao

doi:10.13227/j.hjkx.202207230

[Hydrogen and Oxygen Isotopic Characteristics and Influencing Factors of "Three Waters" in Shandian River Basin]

Huan Jing Ke Xue. 2023 Jul 8;44(7):3855-3863. doi: 10.13227/j.hjkx.202207230.

[Article in Chinese]

Authors

Li-Na Yang^{1

2}, De-Bin Jia^{1

2}, Rui-Zhong Gao^{1

2}, Wen-Xu Su^{1

2}, Fang-Yuan Lu^{1

2}, Yu-Sheng Hao^{1

2}

Affiliations

¹ Institute of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010010, China.
² Key Laboratory of Water Resources Protection and Utilization, Hohhot 010010, China.

PMID: 37438284
DOI: 10.13227/j.hjkx.202207230

Abstract

In this study, we collected precipitation from February 2020 to February 2022 and the surface water and groundwater in the wet (August) and dry (October) periods of 2021 in the Shandian River Basin. Stable isotope technology was used to analyze the temporal and spatial changes in the hydrogen and oxygen stable isotopes of the "three waters" in the basin to explore the relationship between water isomorphs and environmental factors and to reveal the water conversion relationship using the end element mixing model. The results showed that the slope and intercept of the local precipitation line were smaller than the local atmospheric precipitation line. The water vapor mainly came from westerly water vapor, polar air mass, and East Asian monsoon circulation. The precipitation isotope had a significant temperature effect. In terms of time, the isotopes of surface water and groundwater were more enriched in the dry season than those in the wet season, and the d-excess values of surface water and groundwater were lower than the global average, indicating strong local evaporation. Spatially, the δ¹⁸O value of the rivers had the same change characteristics in the wet and dry seasons, showing gradual enrichment from the upstream to the downstream, and the groundwater δ¹⁸O high value area was unevenly distributed in space, with groundwater δ¹⁸O values becoming more depleted with the increase in burial depth. The highest slope of the groundwater water line was 7.87 in the wet season, which was very close to the slope of the local atmospheric precipitation line and river water line, indicating that there was a complex hydraulic connection between the "three waters" in the wet season. The surface water in the study area was mainly supplied by precipitation during the wet season and then by groundwater runoff. These results can provide a theoretical basis for revealing the hydrological cycle in arid and semi-arid areas.

Keywords: Shangdian River Basin; groundwater and surface water; hydrogen and oxygen isotopes; precipitation; water conversion.

Publication types

English Abstract