| 河套灌区西部浅层地下水咸化机制 |
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| 引用本文： | 曾邯斌,苏春利,谢先军,潘洪捷,纪倩楠,陶彦臻.河套灌区西部浅层地下水咸化机制[J].地球科学,2021,46(6):2267-2277. |
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| 作者姓名： | 曾邯斌 苏春利 谢先军 潘洪捷 纪倩楠 陶彦臻 |
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| 作者单位： | 中国地质大学环境学院,湖北武汉 430078;内蒙古自治区地质调查院,内蒙古呼和浩特 010020 |
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| 基金项目： | 内蒙古自治区河套灌区盐碱地生物修复与综合开发研究2019046338 |
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| 摘 要： | 浅层地下水水位埋深浅、含盐量高，是导致河套灌区土壤次生盐渍化的重要原因.以河套灌区西部地区为研究区，通过对浅层地下水的水化学和氢氧同位素特征分析以及水文地球化学模拟，探讨了灌区浅层地下水的补给来源和主控水-岩作用过程，并定量估算了蒸发作用对浅层地下水含盐量的影响.研究区内浅层地下水为弱碱性咸水，pH为7.23~8.45，总溶解性固体（total dissolved solids，TDS）变化范围为371~7 599 mg/L；随着地下水咸化程度增大，水化学类型由HCO3-Na·Mg·Ca型向Cl-Na型过渡.引黄灌溉和大气降水是浅层地下水的主要补给来源，径流过程中浅层地下水受蒸发作用和植物蒸腾作用影响，地下水化学组分主要来源于蒸发盐溶解和硅酸盐风化水解，并受强烈的蒸发作用和离子交换作用影响.水文地球化学模拟和主成分分析结果显示，蒸发作用和岩盐溶解作用对区内浅层地下水咸化贡献最大，石膏和白云石等矿物的溶解、硅酸盐的水解、Na-Ca离子交换以及局部地形起伏对地下水咸化过程也有较大贡献.
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| 关 键 词： | 水化学 同位素 主成分分析 水-岩作用 水文地球化学模拟 |
| 收稿时间： | 2020-07-09 |
Mechanism of Salinization of Shallow Groundwater in Western Hetao Irrigation Area |
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| Zeng Hanbin,Su Chunli,Xie Xianjun,Pan Hongjie,Ji Qiannan,Tao Yanzhen.Mechanism of Salinization of Shallow Groundwater in Western Hetao Irrigation Area[J].Earth Science-Journal of China University of Geosciences,2021,46(6):2267-2277. |
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| Authors: | Zeng Hanbin Su Chunli Xie Xianjun Pan Hongjie Ji Qiannan Tao Yanzhen |
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| Abstract: | High salinity and shallow level of shallow groundwater are the important causes of soil secondary salinization in Hetao irrigation area. In this paper, it takes the western part of Hetao irrigation area as the research area. The hydrochemical analysis, isotopic characteristics of hydrogen and oxygen and hydrogeochemical modeling were investigated to identify the recharge sources of shallow groundwater and the main water-rock interaction processes, and estimate quantitatively the effect of evaporation on shallow groundwater. The results show that shallow groundwater was weak alkaline salt water, the pH and total dissolved solids (total dissolved solids, TDS) are 7.23-8.45 and 371-7 599 mg/L respectively in the research area. With the accumulation of salt, the hydrochemical type of shallow groundwater changed from HCO3-Na·Mg·Ca to Cl-Na. The main recharge resources of shallow groundwater are the irrigation by using Yellow River water and precipitation. The shallow groundwater was affected by evaporation and transpiration during the runoff process. The hydrochemical compositions of shallow groundwater mainly came from the dissolution of halite and silicate weathering, and experienced intense evaporation and the cation exchange. The results of hydrogeochemical modeling and principal component analysis show that evaporation and halite dissolution contributed the most part to the salinity of shallow groundwater; Na-Ca exchange, topography variations and dissolution of gypsum, dolomite and other minerals also contributed to the salinity of groundwater. |
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