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Hydrogeochemical mechanism and irrigation suitability of groundwater in the plain area of Turpan Basin |
DING Qi-zhen1,2,3, ZHOU Yin-zhu1,4, ZHOU Jin-long1,2,3, SUN Ying1,2,3, HAN Shuang-bao4, JIANG Feng1,2,3, LIN Jin-wei4 |
1. College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China; 2. Xinjiang Hydrology and Water Resources Engineering Research Center, Urumqi 830052, China; 3. Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention, Urumqi 830052, China; 4. Center for Hydrogeology and Environmental Geology, China Geological Survey, Tianjin 300304, China |
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Abstract In the plain area of Turpan Basin in Xinjiang, 52 groundwater samples and 7surface water samples were collected for qualitative and quantitative analysis of the source of groundwater solute and the influencing factors of hydrochemistry and evaluation of irrigation water quality using the methods of hydrochemistry, hydrogen and oxygen stable isotopes, forward model (FM) and factor analysis. Shallow groundwater in the northern Turpan Basin was neutral to weak alkaline, while shallow groundwater and deep groundwater in the southern Turpan Basin were weak alkaline, and that the dominant anions and cations were SO42- and K++Na+, respectively; atmospheric precipitation was the main source of groundwater recharge in the study area. Compared with the shallow groundwater in the northern Turpan Basin and the deep groundwater in the southern Turpan Basin, part of the shallow groundwater in the southern Turpan Basin was affected by evaporation-concentration to a certain extent; the source of groundwater solute was mainly controlled by rock weathering, mainly evaporite rock. Relative contributions of river input, human activities and rock weathering to shallow groundwater in the northern Turpan Basin, shallow groundwater in the southern Turpan Basin and deep groundwater in the southern Turpan Basin were (10.23%, 1.25%, 88.52%), (10.72%, 0.66%, 88.62%) and (5.30%, 0.44%, 94.26%), respectively; the hydrochemistry of shallow groundwater in the southern and northern Turpan Basin was mainly affected by leaching-evaporation (54.31%) and agricultural activities-organic matter content (35.36%), while leaching (58.96%) and environmental condition (28.97%) were the main controlling factors of deep groundwater hydrochemistry in the southern Turpan Basin; deep groundwater in the southern Turpan Basin was generally suitable for irrigation. However, shallow groundwater in the northern Turpan Basin was affected by high EC and that in the southern Turpan Basin was affected by high EC and % Na, which were not suitable for irrigation in partial areas.
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Received: 29 February 2024
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