| Study on salinization mechanism of deep confined water in the plain of Kashgar River Basin |
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| DOI：10.7606/j.issn.1000-7601.2020.06.24 |
| Key Words: deep confined water salinization mechanism water chemistry type hydrogen and oxygen isotopes dissolution of minerals Kashgar River Basin |
| Author Name | Affiliation | | WANG Hongtai | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHOU Jinlong | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China
Xinjiang Hydrology and Water Resources Engineering Research Center, Urumqi, Xinjiang 830052, China | | ZENG Yanyan | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China
Xinjiang Hydrology and Water Resources Engineering Research Center, Urumqi, Xinjiang 830052, China | | FAN Wei | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China
Xinjiang Hydrology and Water Resources Engineering Research Center, Urumqi, Xinjiang 830052, China | | WEI Xing | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China
Xinjiang Hydrology and Water Resources Engineering Research Center, Urumqi, Xinjiang 830052, China | | SHI Wenwen | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| In order to understand the salinization of deep confined water in the plain of Kashgar River Basin of Xinjiang, 13 groups of deep confined water samples were collected from June to November 2016 for hydrochemical properties including K+, Na+, Ca2+, Mg2+, HCO-3, CO2-3, SO2-4, Cl-, TDS, and hydrogen and oxygen stable isotopes tests. The mathematical statistics, correlation analysis, Piper diagram and mineral saturation index method were used to explore the main mechanism of deep confined water salinization. The results showed that the deep confined water tended to salinization. The proportion of fresh water, brackish water, and saltwater water samples in deep confined water were 46.1%, 23.1%, and 30.8%, respectively. The main recharge source of deep confined water in the study area was atmospheric precipitation. The variation range of hydrogen stable isotopes (δD) was between -92.7‰ and -58.2‰, with the average of -76.9‰, and the variation range of oxygen stable isotopes (δ18O) was between -12.8‰ and -7.8‰, with an average of -10.6‰. The deuterium excess values (d) in groundwater ranged between -1.50‰ and 18.70‰, with an average of 7.68‰. The salinization of deep confined water in the study area was affected by water\|rock interaction, in which the cations exchange effect of groundwater was obvious. Lixiviation was the main factor influencing groundwater salinization. |
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