干旱区研究

Arid Zone Research >

2022 , Vol. 39 >Issue 2: 419 - 428

DOI: https://doi.org/10.13866/j.azr.2022.02.09

Water Resources and Utilization

Hydrochemical characteristics and quality of groundwater in the plains of the Turpan Basin

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  • 1. College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, Xinjiang, China
    2. Xinjiang Hydrology and Water Resources Engineering Research Center, Urumqi 830052, Xinjiang, China
    3. Xinjiang Key Laboratory of Water Conservancy Engineering Safety and Water Disaster Prevention, Urumqi 830052, Xinjiang, China

Received date: 2021-09-10

  Revised date: 2021-11-20

  Online published: 2022-03-30

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Abstract

In order to study the hydrochemical characteristics and quality of groundwater in the plains of Turpan Basin, 44 groundwater samples (33 phreatic water and 11 confined water) were analyzed. The latest comprehensive groundwater pollution survey data in Turpan Basin in 2015 was used. Mathematical statistics, Piper trilinear diagram, Gibbs diagram, and the ion ratio method were used to analyze the hydrochemical characteristics of groundwater. The Nemerow index method, improved Nemerow index method, and fuzzy comprehensive evaluation method were used to evaluate groundwater quality. The results showed that groundwater was weakly alkaline, with low salinity. The main groundwater hydrochemical types were SO4·Cl-Na·Ca and HCO3·SO4-Na·Ca, followed by HCO3·SO4·Cl-Na·Ca. Groundwater chemical composition was mainly affected by evaporation concentration and rock weathering. Ca2+ and Mg2+ in groundwater are mainly derived from the dissolution of evaporite; Na+, K+ and Cl- are derived from the dissolution of rock salt, and a small amount of Na+ and K+ in partial phreatic water comes from the dissolution of silicate. γ(Na+-Cl-)/γ[(Ca2++Mg2+)-γ(SO42-+HCO3-= -1 showed a significant negative correlation, indicating that the formation of groundwater chemical components was affected by cation exchange. In the three evaluation methods, the proportion of grade Ⅲ and higher water quality was >55%, and the groundwater quality was good on the whole; the proportion of grade Ⅳ and Ⅴ water in the fuzzy comprehensive evaluation method was the lowest (27.3%), and grades Ⅳ and Ⅴ water were mainly distributed in the Bostan township of Toksun County and Railway station town and Qiketai town to the east of Shanshan County.

Key words： Turpan Basin; groundwater; hydrochemical characteristics; quality evaluation

Cite this article

BAI Fan,ZHOU Jinlong,ZENG Yanyan . Hydrochemical characteristics and quality of groundwater in the plains of the Turpan Basin[J]. Arid Zone Research, 2022 , 39(2) : 419 -428 . DOI: 10.13866/j.azr.2022.02.09

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