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| DOI：10.13522/j.cnki.ggps.2022231 |
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| Hydrochemical Property and Hydrogen and Oxygen Isotopes in the Bayin River Basin |
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ZHAI Jingya, JIN Yanxiang, JIN Xin
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1. School of the Geographical Science, Qinghai Normal University, Xining 810016, China;
2. Key Laboratory of Physical Geography and Environmental Processes, Xining 810016, China; 3. Qinghai Provincial People’s Government-academy of Plateau Science and Sustainability, Beijing Normal University, Xining 810016, China
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| Abstract: |
| 【Objective】 The Bayin river basin is located in Qinghai province; the physical and chemical properties of its water vary with many factors. In this paper, we analyze the hydro-chemical properties and hydrogen and oxygen isotopes in different reaches of the basin. 【Method】Water samples were taken from different locations in the basin, and the hydrochemical property and stable isotopes in each sample were analyzed using standard laboratory methods.【Result】①The average pH, TDS and DO of the water samples are 7.53, 399 mg/L and 5.46 mg/L respectively. The predominant anion in the surface water and groundwater is SO42- and Cl-, respectively, while the main cation in the waters is Ca2+, in spring. ②The Na+/(Na++Ca2+) ratio is distributed mainly between the evaporation crystallization zone and the rock weathering zone, far away from the atmospheric precipitation zone. ③The slope of the water evaporation line is 4.94, significantly lower than that of local and global atmospheric precipitation lines. The average stable hydrogen and oxygen isotopes in the river water are between the average atmospheric precipitation and the groundwater in the mountainous region in north of the basin. ④Evaporation crystallization and rock weathering are the main factors controlling hydro-chemical property of the basin water, and rock weathering and dissolution of evaporite and carbonate are the main sources of the ions. ⑤Recharge to the upstream groundwater is surface water leakage and lateral runoff, accounting for 43.36% and 56.64% of the total recharge, respectively, while recharge to the groundwater in the middle reach is surface water and upstream river water, accounting for 69.51% and 30.49% of the toral recharge, respectively. In the downstream reach, groundwater recharges the river and spring, accounting for 10.26% and 89.74% of their total recharges, respectively. |
| Key words: hydrochemistry; stable isotopes; hydrological processes; arid inland river basin |
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