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首页> 外文期刊>Environmental earth sciences >Study on the hydrochemical characteristics of groundwater along the Taklimakan Desert Highway
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Study on the hydrochemical characteristics of groundwater along the Taklimakan Desert Highway

机译：塔克拉玛干沙漠公路沿线地下水水化学特征研究

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摘要

Groundwater is the only water source of the shelterbelt along the Taklimakan Desert Highway in northwestern China. Understanding the hydrochemical zoning characteristics, material source, and hydrochemical processes of this desert groundwater is important for rational groundwater exploitation. Meanwhile, determining the location of the dividing boundary, which divides the influence ranges of the Tarim river and the Kunlun mountain river system on the desert groundwater, is meaningful for the local desert hydrogeological study. For these objectives, 105 groundwater samples were investigated to obtain analytical data of groundwater chemistry, and ionic relations methods including ratio graphs and Gibbs plots were applied in the chemical analysis for these data. Chemical analysis shows that desert groundwater is characterized by Cl- SO4-Na Mg and Cl- SO4- Na types with total dissolved solid (TDS) of 2.80-29.77 g/L. Spatial variation patterns of major ions, TDS, and SO42-/Cl molar ratio reveal clear four hydrochemical zones along the groundwater flow direction on one hand; on the other hand, these variation patterns also indicate that the boundary dividing the influence ranges of the Tarim river and the Kunlun mountain river system is the approximate location of Well 030. Ratio graphs show that the average molar ratios (Na+ K+)/Cl- (1.05) and (Ca2+ Mg2+)/SO42(0.93) are approximately equal to 1, and there is an approximately linear correlation between (Na+ K+) and SO42-. These results reveal that the groundwater composition is mainly influenced by dissolution of evaporate (halite, gypsum, and mirabilite). Moreover, ionic relations demonstrate that the dominating hydrochemical processes in the groundwater evolution are evaporation and cations exchange.
机译：地下水是中国西北塔克拉玛干沙漠公路沿线防护林带的唯一水源。了解该沙漠地下水的水化学分区特征，物质来源和水化学过程对于合理开采地下水很重要。同时，确定划分塔里木河和昆仑山河系对沙漠地下水影响范围的边界位置，对于当地沙漠水文地质研究具有重要意义。为了实现这些目标，对105个地下水样品进行了调查以获得地下水化学分析数据，并对这些数据进行了离子比率方法（包括比率图和吉布斯图）的化学分析。化学分析表明，沙漠地下水的特征在于Cl-SO4-Na Mg和Cl-SO4-Na类型，总溶解固体（TDS）为2.80-29.77 g / L。主要离子，TDS和SO42- / Cl摩尔比的空间变化格局一方面揭示了沿地下水流向的四个清晰的化学区域。另一方面，这些变化模式也表明，将塔里木河和昆仑山区河流影响范围划分的边界是030井的近似位置。比率图显示平均摩尔比（Na + K +）/ Cl- （1.05）和（Ca2 + Mg2 +）/ SO42（0.93）大约等于1，并且（Na + K +）和SO42-之间存在近似线性相关。这些结果表明，地下水成分主要受蒸发物（卤石，石膏和芒硝）溶解的影响。此外，离子关系表明，地下水演化中主要的水化学过程是蒸发和阳离子交换。

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