水资源及其利用

吐鲁番盆地平原区地下水水化学特征及水质评价

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  • 1.新疆农业大学水利与土木工程学院,新疆 乌鲁木齐 830052
    2.新疆水文水资源工程技术研究中心,新疆 乌鲁木齐 830052
    3.新疆水利工程安全与水灾害防治重点实验室,新疆 乌鲁木齐 830052
白凡(1994-),男,硕士研究生,主要从事干旱区地下水资源评价与保护方面的研究. E-mail: 89304394@qq.com

收稿日期: 2021-09-10

  修回日期: 2021-11-20

  网络出版日期: 2022-03-30

基金资助

中国地质调查局项目(1212011220982)

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

摘要

为研究吐鲁番盆地平原区地下水水化学特征及水质状况,根据吐鲁番地区2015年(最近1次)全面的地下水污染调查数据,选取44组地下水水质检测数据(潜水33组,承压水11组),运用数理统计、Piper三线图、Gibbs图、离子比值法对研究区地下水水化学特征及成因进行分析,运用内梅罗指数法、改进内梅罗指数法和模糊综合评价法对研究区地下水质量进行评价。结果表明:(1) 吐鲁番盆地平原区地下水主要为低矿化度的弱碱性水,水化学类型以SO4·Cl-Na·Ca型和HCO3·SO4-Na·Ca型为主,其次为HCO3·SO4·Cl-Na·Ca型;研究区水化学成分主要受蒸发浓缩和岩石风化共同作用的影响。(2) 地下水中的Ca2+、Mg2+主要来自蒸发岩的溶解,Na+、K+、Cl-主要来自岩盐的溶解,少量潜水中的Na+和K+来自硅酸盐的溶解。(3) γ(Na+-Cl-)/γ[(Ca2++Mg2+)-γ(SO42-+HCO3-)=-1,呈显著负相关,说明地下水化学组分的形成受到了阳离子交换作用的影响。(4) 水质评价结果显示:3种评价方法中的Ⅲ类及以上水质占比均高于55%,地下水质量整体较好;模糊综合评价法的Ⅳ、Ⅴ类水占比最低为27.3%,Ⅳ、Ⅴ类水主要分布在托克逊县的博斯坦乡和鄯善县以东的火车站镇和七克台镇。

本文引用格式

白凡,周金龙,曾妍妍 . 吐鲁番盆地平原区地下水水化学特征及水质评价[J]. 干旱区研究, 2022 , 39(2) : 419 -428 . DOI: 10.13866/j.azr.2022.02.09

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.

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